diff --git a/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts b/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts
index 03fbc6088..92285c869 100644
--- a/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts
+++ b/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts
@@ -17,6 +17,7 @@ export interface DesignDrawingItem {
     | "plan_lidar"
     | "cross_standard"
     | "structure"
+    | "development"
     | "blank";
   label: string;
   chainage_m: number | null;
@@ -114,6 +115,7 @@ export interface DesignDrawingResponse {
     | "plan_lidar"
     | "cross_standard"
     | "structure"
+    | "development"
     | "blank";
   label: string;
   drawing: CadDrawing;
diff --git a/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Development.py b/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Development.py
new file mode 100644
index 000000000..e1c4381c9
--- /dev/null
+++ b/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Development.py
@@ -0,0 +1,328 @@
+"""B07 전개도 자료 · 묶음 — 종단 길이를 가진 구조물을 (종류 · 형태)마다 한 장으로(요구 241-2 · 3).
+
+서버 단독(CLAUDE.md 5장 ③) · 저장 안 함 · 값을 짓지 않고 정본을 모으기만:
+    관보호공      배관 유입 · 유출(`{쪽}_type == 기슭막이`) `{쪽}_revet_*`
+                  + 추가 흙막이 `soil_add_{n}_*`
+    BOX · 세월교   유입 · 유출 구조 == 흙막이(B08 `_guard`) + 추가 흙막이
+    흙막이 · 옹벽  C군 벽(표 형상 wall) start_m ~ end_m · 높이 height_m · 추가 단 = 별도 박스
+                  옹벽 형태 = `wall_form`(`form` 은 형식) · 숨김 벽 종류 = 흙막이 묶음
+    포장 · 쇄석    G군 `pavement_specs_from` 구간 · 폭 B = `width_m`(빈칸 = 횡단 노폭 평균)
+흙막이 길이 · 빈 높이 = B08 구조물집계표와 같은 규칙(`_revet_length` · 관경 최소 높이 · 박스 높이) ·
+시점 = 기준 − 전 · 종점 = 기준 + 후(둘 다 비면 길이 반씩) · 거리 = 종점 − 시점 · 면적 = 거리 × H(B).
+추가 흙막이 단 수 = 지형이 세운 유출 다단까지(`container_rows` · 설계가 있을 때만).
+그림 = `B07_DesignDetail_Engine_Cad_Development_Draw.py`.
+"""
+
+from __future__ import annotations
+
+import json
+import re
+from pathlib import Path
+from typing import Any
+
+from B06_Section.B06_Section_Engine_Culvert import pipe_wall_height_m, pipe_wall_min_height_m
+from B06_Section.B06_Section_Engine_Structures_Wall import tier_extras
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad import infer_station_interval
+from B07_DesignDetail.B07_DesignDetail_Schema import DesignDrawingItem
+from B08_Quantity.B08_Quantity_Router_Summary import (
+    FORMS,
+    GUARD_SOIL,
+    SOIL,
+    _guard,
+    _num,
+    _revet_length,
+)
+from common_util.common_util_drainage_pipes import pipe_points_path_in, read_pipe_points_file
+from common_util.common_util_structure_catalog import base_type, catalog_row
+from common_util.common_util_structure_pavement import pavement_specs_from
+from common_util.common_util_summary_item import GROUP_JOIN
+from M02_MasterTemplete import M02_Table_Fill as fill
+from M02_MasterTemplete.M02_Table_Fill_Spec import container_rows, soil_tiers_from_designs
+
+DEVELOPMENT_ID = re.compile(r"^development_([a-z]+\d?)(?:_(\d+))?$")
+#: 묶음 차례 · 이름 — 포장은 형태 없이 한 묶음
+GROUPS = {
+    "pipe": "관보호공",
+    "box": "BOX암거 흙막이",
+    "ford": "세월교 흙막이",
+    "soil": "흙막이",
+    "wall": "옹벽",
+    "concrete": "콘크리트포장",
+    "gravel": "쇄석포설",
+}
+PAVEMENTS = {"pavement_concrete": "concrete", "gravel_surfacing": "gravel"}
+_BODY_GROUP = {"pipe": "pipe", "box_culvert": "box", "ford_bridge": "ford"}
+#: 한 장에 담는 박스 수 — 넘치면 `_2` 장(우하단 표가 작도 영역 안에 들게)
+MAX_ROWS = 30
+_EMPTY_FORM = 9  # 형태 빈칸 id 자리
+
+
+def station_text(chainage_m: float, interval_m: float) -> str:
+    """전개도 측점 — `No.04+08` · 소수면 `No.22+05.5`(그림 241 표기)."""
+    safe = interval_m if interval_m > 0 else 20.0
+    number = int((chainage_m + 1e-6) // safe)
+    rest = round(chainage_m - number * safe, 1)
+    if rest >= safe - 0.05:
+        number, rest = number + 1, 0.0
+    if abs(rest - round(rest)) < 0.05:
+        return f"No.{number:02d}+{int(round(rest)):02d}"
+    return f"No.{number:02d}+{rest:04.1f}"
+
+
+def _row(group: str, form: Any, start: float | None, end: float | None, height: Any, key: str):
+    """박스 한 줄 — 시점 · 종점 중 하나라도 없으면 길이 미입력."""
+    if start is not None and end is not None and end < start:
+        start, end = end, start
+    return {
+        "group": group,
+        "form": str(form or ""),
+        "start_m": start,
+        "end_m": end,
+        "height_m": _num(height),
+        "key": key,
+    }
+
+
+def _span(at: float, options: dict[str, Any], head: str, unit: str):
+    """기준 측점 + 전 · 후(둘 다 비면 길이 반씩) → (시점, 종점) · 길이도 없으면 (None, None)."""
+    before = _num(options.get(f"{head}before{unit}"))
+    after = _num(options.get(f"{head}after{unit}"))
+    if before is None and after is None:
+        length = _revet_length(options, head, unit)
+        if not length:
+            return None, None
+        before = after = length / 2.0
+    return at - (before or 0.0), at + (after or 0.0)
+
+
+def _empty_heights(type_id: str, item: dict[str, Any]) -> dict[str, float | None]:
+    """빈 높이 — 관 = 관경 최소(유입 + 0.7) · 박스 = 박스 높이 · 세월교 = 미입력(B08 같은 규칙)."""
+    options = item["options"]
+    if type_id == "pipe":
+        diameter = _num(options.get("pipe_diameter_mm"))
+        if not diameter:
+            return {"inlet": None, "outlet": None, "soil_add": None}
+        meters = diameter / 1000.0
+        wall = pipe_wall_min_height_m(meters)
+        return {"inlet": pipe_wall_min_height_m(meters, "inlet"), "outlet": wall, "soil_add": wall}
+    height = _num(options.get("body_height_m")) if type_id == "box_culvert" else None
+    return {"inlet": height, "outlet": height, "soil_add": height}
+
+
+def _body_rows(item: dict[str, Any], raw: dict[str, Any]) -> list[dict[str, Any]]:
+    """배관 · 박스 · 세월교 한 곳 — 유입 · 유출 흙막이 + 추가 흙막이 n."""
+    type_id = item["type_id"]
+    group = _BODY_GROUP[type_id]
+    at = float(item["chainage_m"])
+    empty = _empty_heights(type_id, item)
+    diameter = _num(item["options"].get("pipe_diameter_mm"))
+    if type_id == "pipe":
+        sides = [side for side in ("inlet", "outlet") if raw.get(f"{side}_type") == SOIL]
+    else:
+        sides = [
+            s for s in ("inlet", "outlet") if _guard(type_id, item["options"], s) == GUARD_SOIL
+        ]
+    rows = []
+    for side in sides:
+        height = _num(raw.get(f"{side}_revet_height_m"))
+        if type_id == "pipe" and diameter:
+            height = pipe_wall_height_m(height, diameter / 1000.0)
+        start, end = _span(at, raw, f"{side}_revet_", "_m")
+        form = raw.get(f"{side}_revet_form")
+        key = f"{item['복사본']}:{side}"
+        rows.append(_row(group, form, start, end, empty[side] if height is None else height, key))
+    for extra in container_rows(item, {}):
+        link = extra["복사본"].partition(GROUP_JOIN)[2]
+        if not link.startswith("gsoiladd"):
+            continue
+        head = f"soil_add_{link[len('gsoiladd') :]}_"
+        height = _num(raw.get(f"{head}height"))
+        start, end = _span(at, raw, head, "")
+        height = empty["soil_add"] if height is None else height
+        rows.append(_row(group, raw.get(f"{head}form"), start, end, height, extra["복사본"]))
+    return rows
+
+
+def _wall_rows(item: dict[str, Any]) -> list[dict[str, Any]]:
+    """C군 벽 — 본 단 + 추가 단(별도 박스 · 같은 구간)."""
+    type_id = item["type_id"]
+    options = item["options"]
+    wall = base_type(type_id) == "retaining_wall"
+    group = "wall" if wall else "soil"
+    form = (
+        options.get("wall_form")
+        if wall
+        else options.get("form")
+        or ((catalog_row(type_id) or {}).get("shapeOpts") or {}).get("form")
+    )
+    start, end = _num(item.get("start_m")), _num(item.get("end_m"))
+    key = item["복사본"]
+    rows = [_row(group, form, start, end, options.get("height_m"), key)]
+    for n, extra in enumerate(tier_extras(type_id, options), start=1):
+        tier_form = extra["form"] or form
+        rows.append(_row(group, tier_form, start, end, extra["height_m"], f"{key}:tier{n}"))
+    return rows
+
+
+def _road_width(designs: dict[float, Any], start: float, end: float) -> float | None:
+    """구간 안 측점 횡단 노폭(`carriageway_width_m`) 평균 — 없으면 None."""
+    widths = [
+        width
+        for chainage, design in (designs or {}).items()
+        if start - 0.02 <= float(chainage) <= end + 0.02
+        and isinstance(design, dict)
+        and (width := _num(design.get("carriageway_width_m")))
+    ]
+    return round(sum(widths) / len(widths), 2) if widths else None
+
+
+def _pavement_rows(item: dict[str, Any], designs: dict[float, Any]) -> list[dict[str, Any]]:
+    """콘크리트 포장 · 쇄석 포설 — 구간 × 폭 B."""
+    specs = pavement_specs_from([item], {item["type_id"]})
+    group = PAVEMENTS[base_type(item["type_id"])]
+    if not specs:
+        return [_row(group, "", None, None, None, item["복사본"])]
+    start, end = specs[0]["start_m"], specs[0]["end_m"]
+    width = _num(item["options"].get("width_m")) or _road_width(designs, start, end)
+    if end <= start:
+        start = end = None
+    return [_row(group, "", start, end, width, item["복사본"])]
+
+
+def development_rows(
+    project_root: str | Path, designs: dict[float, Any] | None = None
+) -> list[dict[str, Any]]:
+    """설계 정본 → 전개도 박스 줄 전부(묶음 · 형태 · 시점 · 종점 · 높이(폭)).
+
+    `designs` = `{측점: 횡단 설계}` — 추가 흙막이 단 수 · 포장 빈 폭에 씀(없으면 저장된 것 그대로).
+    """
+    rows_in = [{"chainage_m": k, "design": v} for k, v in (designs or {}).items()]
+    items = fill.collect_items(
+        project_root, soil_tiers=soil_tiers_from_designs(rows_in) if designs else None
+    )
+    raw = {
+        (point.facility or "pipe", f"pipe@{round(float(point.chainage_m), 3)}"): point.options
+        for point in read_pipe_points_file(pipe_points_path_in(Path(project_root)))
+    }
+    rows: list[dict[str, Any]] = []
+    for item in items:
+        owner, _, link = item["복사본"].partition(GROUP_JOIN)
+        if link:
+            continue  # 그룹 · 컨테이너 줄은 본체 줄에서 다시 셈(단 수 거름)
+        type_id = item["type_id"]
+        if type_id in _BODY_GROUP:
+            rows += _body_rows(item, dict(raw.get((type_id, owner)) or {}))
+        elif (catalog_row(type_id) or {}).get("shape") == "wall":
+            rows += _wall_rows(item)
+        elif base_type(type_id) in PAVEMENTS:
+            rows += _pavement_rows(item, designs or {})
+    return rows
+
+
+def _form_index(form: str) -> int:
+    return FORMS.index(form) if form in FORMS else _EMPTY_FORM
+
+
+def development_sheets(rows: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    """(묶음 · 형태)마다 한 장 · 넘치면 `_2` — `{id, kind_id, title, group, rows, missing}`."""
+    found: dict[tuple[int, int, str], list[dict[str, Any]]] = {}
+    order = list(GROUPS)
+    for row in rows:
+        paved = row["group"] in ("concrete", "gravel")
+        form = "" if paved else row["form"]
+        key = (order.index(row["group"]), _form_index(form) if not paved else 0, form)
+        found.setdefault(key, []).append(row)
+    sheets = []
+    for (group_at, form_at, form), members in sorted(found.items()):
+        group = order[group_at]
+        paved = group in ("concrete", "gravel")
+        kind_id = f"development_{group}" if paved else f"development_{group}{form_at}"
+        title = (
+            f"{GROUPS[group]} 전개도"
+            if paved
+            else f"{GROUPS[group]} {form or '형태 미입력'} 전개도"
+        )
+        drawn = sorted(
+            (r for r in members if r["start_m"] is not None), key=lambda r: (r["start_m"], r["key"])
+        )
+        missing = len(members) - len(drawn)
+        chunks = [drawn[i : i + MAX_ROWS] for i in range(0, len(drawn), MAX_ROWS)] or [[]]
+        for index, chunk in enumerate(chunks, start=1):
+            sheets.append(
+                {
+                    "id": kind_id if index == 1 else f"{kind_id}_{index}",
+                    "kind_id": kind_id,
+                    "title": title if index == 1 else f"{title} ({index})",
+                    "group": group,
+                    "form": form,
+                    "rows": chunk,
+                    "missing": missing if index == 1 else 0,
+                }
+            )
+    return sheets
+
+
+def table_rows(rows: list[dict[str, Any]], interval_m: float) -> list[dict[str, Any]]:
+    """우하단 표 줄 — 측점 범위 · 거리 · 높이(폭) · 면적(높이 빈칸이면 빈칸)."""
+    out = []
+    for row in rows:
+        distance = round(row["end_m"] - row["start_m"], 3)
+        height = row["height_m"]
+        out.append(
+            {
+                "station": f"{station_text(row['start_m'], interval_m)}~"
+                f"{station_text(row['end_m'], interval_m)}",
+                "distance": distance,
+                "height": height,
+                "area": None if height is None else round(distance * height, 3),
+            }
+        )
+    return out
+
+
+def _read_json(path: Path) -> dict[str, Any]:
+    try:
+        return json.loads(path.read_text(encoding="utf-8"))
+    except (OSError, ValueError):
+        return {}
+
+
+def development_list(
+    project_root: Path, manifest_drawings: dict[str, Any]
+) -> list[DesignDrawingItem]:
+    """좌측 「전개도」 카드 단추 — 장마다 한 줄 · 하위 묶음(plan_kind) = 구조물 종류."""
+    return [
+        DesignDrawingItem(
+            id=sheet["id"],
+            kind="development",
+            label=sheet["title"],
+            confirmed=bool(manifest_drawings.get(sheet["id"], {}).get("confirmed")),
+            plan_kind=f"development_{sheet['group']}",
+            plan_kind_name=GROUPS[sheet["group"]],
+        )
+        for sheet in development_sheets(development_rows(project_root))
+    ]
+
+
+def read_development(
+    project_root: Path, longitudinal_path: Path, drawing_id: str, designs: Any
+) -> tuple[str, str, dict[str, Any], bool, None]:
+    """전개도 한 장 — 목록 뒤 설계로 단 수가 줄어 장이 사라졌으면 빈 장 + 안내."""
+    from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Development_Draw import (
+        build_development_drawing,
+    )
+
+    designs = designs if isinstance(designs, dict) else {}
+    sheets = development_sheets(development_rows(project_root, designs))
+    sheet = next((s for s in sheets if s["id"] == drawing_id), None)
+    if sheet is None:
+        match = DEVELOPMENT_ID.fullmatch(drawing_id)
+        if not match:
+            raise ValueError("올바르지 않은 도면 ID입니다.")
+        base = next((s for s in sheets if s["kind_id"] == f"development_{match.group(1)}"), None)
+        sheet = {**(base or {"title": "전개도", "group": "soil", "form": ""}), "rows": []}
+        sheet["missing"] = 0
+    longitudinal = _read_json(longitudinal_path)
+    interval = infer_station_interval(longitudinal.get("stations") or []) or 20.0
+    drawing = build_development_drawing(drawing_id, sheet, interval)
+    return "development", sheet["title"], drawing, False, None
diff --git a/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Development_Draw.py b/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Development_Draw.py
new file mode 100644
index 000000000..e1000df42
--- /dev/null
+++ b/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Development_Draw.py
@@ -0,0 +1,440 @@
+"""B07 전개도 그림 — 한 장 = 박스 줄바꿈 배치 · 형태 무늬 · 양 끝 측점 · 우하단 표 · 도각.
+
+그림 241(콘크리트포장 · 전석메쌓기 전개도) 꼴:
+    박스 = 거리(종점 − 시점) × H(포장 B) · 좌우 끝 = 시점 · 종점 측점(붉은 지시선 + 기울인 글)
+    · 끝 옆 「H=2.0」(포장 「B=3.5」) · 박스 아래 「L=6.0m」
+    · 우하단 표(측점 · 거리 · 높이/폭 · 면적 · 계)
+무늬 = 기본 도형(PolyLine · Circle · Line)으로 직접 — CAD Hatch 는 DXF 내보내면 채움이 사라짐.
+흔들림 = 도면 id · 박스 열쇠 씨앗(같은 자료 = 같은 그림 · 엔티티 id 도 uuid5 결정).
+좌표 = 종이 mm · 가로 축척 자동(한 장에 드는 가장 큰 그림) · 세로는 가장 높은 박스가 12~40 mm.
+"""
+
+from __future__ import annotations
+
+import math
+import random
+from typing import Any
+
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad import (
+    DRAWING_FORMAT,
+    FRAME_LAYER_ID,
+    TABLE_LABEL_COLOR,
+    TABLE_VALUE_COLOR,
+    _circle_entity,
+    _layer,
+    _line_entity,
+    _text_entity,
+    polyline_entity,
+    table_entity,
+)
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Development import station_text, table_rows
+from B07_DesignDetail.B07_DesignDetail_Engine_Template import (
+    drawing_area,
+    frame_entities,
+    scale_fields,
+)
+
+BOX_LAYER_ID = "b07-dev-box"
+FILL_LAYER_ID = "b07-dev-fill"
+LABEL_LAYER_ID = "b07-dev-label"
+TABLE_LAYER_ID = "b07-dev-table"
+BOX_COLOR = "#f5f7fa"
+FILL_COLOR = "#aab4c0"
+LEADER_COLOR = "#ff4d4d"
+TABLE_COLOR = "#e03131"
+#: 가로 축척 후보(분모) — 작은 것부터 대어 보고 처음 드는 것
+SCALES = (50, 100, 200, 300, 500, 600, 1000, 1200, 2000, 2500, 3000, 5000)
+_MARGIN = 10.0
+_TITLE_H = 26.0  # 제목 자리
+_LEAD = 18.0  # 박스 위 지시선 · 측점 글 자리
+_BELOW = 9.0  # 박스 아래 L= 자리
+_GAP = 16.0  # 박스 사이(오른 끝 기울인 글 자리)
+_MIN_H, _MAX_H = 12.0, 40.0  # 가장 높은 박스 세로 mm
+_EMPTY_H = 0.6  # 높이 빈칸 박스 = 가장 높은 박스의 몫
+_FONT, _TITLE_FONT = 2.5, 7.0
+_TABLE_FONT = 3.2  # 표는 그림 241 처럼 크게(작도 영역 폭의 약 1/4)
+_ROW_H = 9.0
+_COLUMNS = (80.0, 32.0, 32.0, 40.0)
+_SLANT = (0.5, math.sqrt(3) / 2)  # 60°
+
+
+def _fmt(value: float | None) -> str:
+    return "" if value is None else f"{value:,.1f}"
+
+
+def _size(value: float | None) -> str:
+    """높이 · 폭 — 소수 둘째 자리까지(3.55 · 3.5 · 2.0) · 면적이 쓴 값 그대로 보이게."""
+    if value is None:
+        return ""
+    text = f"{value:.2f}".rstrip("0")
+    return f"{text}0" if text.endswith(".") else text
+
+
+# ── 무늬 ────────────────────────────────────────────────
+
+
+def _stone(rng: random.Random, cx: float, cy: float, r: float) -> list[tuple[float, float]]:
+    """흔든 7각 돌 하나(닫힌 점열)."""
+    turn = rng.uniform(0, math.tau)
+    points = [
+        (
+            cx + r * rng.uniform(0.7, 1.0) * math.cos(turn + i * math.tau / 7),
+            cy + r * rng.uniform(0.7, 1.0) * math.sin(turn + i * math.tau / 7),
+        )
+        for i in range(7)
+    ]
+    return [*points, points[0]]
+
+
+def _stones(seed, rng, box, rows, cap=500):
+    """박스 안 엇갈린 격자에 흔든 돌 — 높이에 `rows` 줄(크기 = 높이 몫) · 박스를 안 넘음."""
+    x0, y0, x1, y1 = box
+    r = min((y1 - y0) / (rows * 2.3), (y1 - y0) / 2 - 0.3, (x1 - x0) / 2 - 0.3)
+    if r < 0.3:
+        return []
+    step = 2.3 * r
+    out = []
+    y, row = y0 + 0.3 + r, 0
+    while y <= y1 - 0.3 - r + 1e-9 and len(out) < cap:
+        x = x0 + 0.3 + r + (step / 2 if row % 2 else 0.0)
+        while x <= x1 - 0.3 - r + 1e-9 and len(out) < cap:
+            room = (x - x0 - 0.3 - r, x1 - 0.3 - r - x)  # 왼 · 오 여유 — 돌이 박스를 안 넘게
+            jx = max(-room[0], min(rng.uniform(-0.15, 0.15) * step, room[1]))
+            line = polyline_entity(
+                seed, _stone(rng, x + jx, y, r), FILL_LAYER_ID, FILL_COLOR, f":s{len(out)}"
+            )
+            if line:
+                out.append(line)
+            x += step
+        y += step * 0.87
+        row += 1
+    return out
+
+
+def _dots(seed, rng, box, per_mm2, radius, cap):
+    x0, y0, x1, y1 = box
+    count = min(cap, int((x1 - x0) * (y1 - y0) * per_mm2))
+    return [
+        _circle_entity(
+            f"{seed}:d{i}",
+            (rng.uniform(x0 + radius, x1 - radius), rng.uniform(y0 + radius, y1 - radius)),
+            radius,
+            FILL_LAYER_ID,
+            FILL_COLOR,
+        )
+        for i in range(count)
+    ]
+
+
+def _grid(seed, box, step):
+    x0, y0, x1, y1 = box
+    out = []
+    x = x0 + step
+    while x < x1 - 0.1:
+        out.append(
+            _line_entity(f"{seed}:gx{len(out)}", (x, y0), (x, y1), FILL_LAYER_ID, FILL_COLOR)
+        )
+        x += step
+    y = y0 + step
+    while y < y1 - 0.1:
+        out.append(
+            _line_entity(f"{seed}:gy{len(out)}", (x0, y), (x1, y), FILL_LAYER_ID, FILL_COLOR)
+        )
+        y += step
+    return out
+
+
+def _logs(seed, box):
+    """통나무 · 목재틀 = 가운데 원 한 줄."""
+    x0, y0, x1, y1 = box
+    r = min((y1 - y0) / 2 - 0.3, 4.0)
+    if r < 0.3:
+        return []
+    count = max(int((x1 - x0 - 0.4) // (2 * r + 0.4)), 0)
+    cy = (y0 + y1) / 2
+    return [
+        _circle_entity(
+            f"{seed}:o{i}", (x0 + 0.4 + r + i * (2 * r + 0.4), cy), r, FILL_LAYER_ID, FILL_COLOR
+        )
+        for i in range(count)
+    ]
+
+
+def _stakes(seed, box, step=2.5):
+    """바자 = 세운 말뚝 줄."""
+    x0, y0, x1, y1 = box
+    count = max(int((x1 - x0) // step), 0)
+    return [
+        _line_entity(
+            f"{seed}:k{i}",
+            (x0 + (i + 0.5) * step, y0),
+            (x0 + (i + 0.5) * step, y1),
+            FILL_LAYER_ID,
+            FILL_COLOR,
+        )
+        for i in range(count)
+    ]
+
+
+def fill_entities(seed: str, form: str, group: str, box: tuple[float, float, float, float]):
+    """형태 → 무늬(찰 작은 돌 · 메 큰 돌 · 콘크리트 · 쇄석 점 · 돌망태 격자+돌 · 통나무 원)."""
+    rng = random.Random(seed)
+    if group == "gravel":
+        return _dots(seed, rng, box, 0.025, 0.9, 900)
+    if group == "concrete" or form == "콘크리트":
+        return _dots(seed, rng, box, 0.045, 0.6, 1200)
+    if form == "돌쌓기(찰)":
+        return _stones(seed, rng, box, 5)
+    if form == "돌쌓기(메)":
+        return _stones(seed, rng, box, 2.5)
+    if form == "돌망태":
+        cells = max(round((box[3] - box[1]) / 12.0), 1)  # 망태 한 단 ≈ 12 mm
+        return _grid(seed, box, (box[3] - box[1]) / cells) + _stones(seed, rng, box, 3 * cells)
+    if form == "통나무·목재틀":
+        return _logs(seed, box)
+    if form == "바자":
+        return _stakes(seed, box)
+    return []
+
+
+# ── 배치 ────────────────────────────────────────────────
+
+
+def _vertical(rows: list[dict[str, Any]], mm_h: float) -> float:
+    """세로 mm/m — 가로와 같게 두되 가장 높은 박스가 12~40 mm 안에 들게."""
+    tallest = max((r["height_m"] for r in rows if r["height_m"]), default=None)
+    if not tallest:
+        return _MIN_H
+    return min(max(mm_h, _MIN_H / tallest), _MAX_H / tallest)
+
+
+def layout(rows, area, table_box, mm_h, strict=True):
+    """박스 줄바꿈 배치 → [(row, x0, y0, x1, y1)] · 영역을 넘치면 None(strict)."""
+    ax0, ay0, ax1, ay1 = area
+    v = _vertical(rows, mm_h)
+    tallest = max((r["height_m"] or 0.0 for r in rows), default=0.0)
+    empty_h = (tallest * v if tallest else _MIN_H) * _EMPTY_H
+    left, top = ax0 + _MARGIN, ay1 - _TITLE_H
+    placed, line, x, line_h = [], [], left, 0.0
+
+    def right_limit(height: float) -> float:
+        bottom = top - _LEAD - height - _BELOW
+        return table_box[0] - _GAP if bottom < table_box[3] + 4.0 else ax1 - _MARGIN
+
+    for row in rows:
+        w = max((row["end_m"] - row["start_m"]) * mm_h, 2.0)
+        h = row["height_m"] * v if row["height_m"] else empty_h
+        if line and x + w > right_limit(max(line_h, h)):
+            top -= _LEAD + line_h + _BELOW
+            placed += line
+            line, x, line_h = [], left, 0.0
+        if strict and (
+            x + w > right_limit(max(line_h, h)) or top - _LEAD - h - _BELOW < ay0 + _MARGIN
+        ):
+            return None
+        line.append((row, x, top - _LEAD - h, x + w, top - _LEAD))
+        x += w + _GAP
+        line_h = max(line_h, h)
+    return placed + line
+
+
+def _choose(rows, area, table_box):
+    """처음 드는 축척 — 끝까지 안 들면 가장 작은 축척으로 그대로(도각이 넘침 경고)."""
+    for denominator in SCALES:
+        placed = layout(rows, area, table_box, 1000.0 / denominator)
+        if placed is not None:
+            return denominator, placed
+    denominator = SCALES[-1]
+    return denominator, layout(rows, area, table_box, 1000.0 / denominator, strict=False)
+
+
+# ── 글 · 표 ─────────────────────────────────────────────
+
+
+def _box_entities(drawing_id, index, row, box, label, station):
+    x0, y0, x1, y1 = box
+    seed = f"{drawing_id}:b{index}"
+    out = [
+        polyline_entity(
+            drawing_id,
+            [(x0, y0), (x1, y0), (x1, y1), (x0, y1), (x0, y0)],
+            BOX_LAYER_ID,
+            BOX_COLOR,
+            f":b{index}",
+        )
+    ]
+    out += fill_entities(f"{seed}:{row['key']}", row["form"], row["group"], (x0, y0, x1, y1))
+    height = "미입력" if row["height_m"] is None else _size(row["height_m"])
+    for end, x, chainage in (("s", x0, row["start_m"]), ("e", x1, row["end_m"])):
+        out.append(
+            _line_entity(
+                f"{seed}:{end}:lead", (x, y1), (x, y1 + _LEAD - 2.0), LABEL_LAYER_ID, LEADER_COLOR
+            )
+        )
+        out.append(
+            _text_entity(
+                f"{seed}:{end}:no",
+                station(chainage),
+                x + 0.8,
+                y1 + 1.2,
+                LABEL_LAYER_ID,
+                _FONT,
+                TABLE_LABEL_COLOR,
+                "left",
+                _SLANT,
+            )
+        )
+        out.append(
+            _text_entity(
+                f"{seed}:{end}:h",
+                f"{label}={height}",
+                x + 3.6,
+                y1 + 1.2,
+                LABEL_LAYER_ID,
+                _FONT,
+                TABLE_VALUE_COLOR,
+                "left",
+                _SLANT,
+            )
+        )
+    length = row["end_m"] - row["start_m"]
+    out.append(
+        _text_entity(
+            f"{seed}:len",
+            f"L={length:.1f}m",
+            (x0 + x1) / 2,
+            y0 - 5.0,
+            LABEL_LAYER_ID,
+            _FONT,
+            TABLE_LABEL_COLOR,
+        )
+    )
+    return [entity for entity in out if entity]
+
+
+def _table(drawing_id, lines, label, origin):
+    """측점(NO) · 거리(M) · 높이/폭(M) · 면적(㎡) · 계."""
+
+    def cell(text, align="center", color=TABLE_LABEL_COLOR):
+        return {"text": text, "align": align, "color": color}
+
+    head = "폭" if label == "B" else "높이"
+    cells = [
+        [cell("측 점"), cell("거 리"), cell(head), cell("면 적")],
+        [cell("(NO)"), cell("(M)"), cell("(M)"), cell("(㎡)")],
+    ]
+    for item in lines:
+        cells.append(
+            [
+                cell(item["station"]),
+                cell(_fmt(item["distance"]), "right", TABLE_VALUE_COLOR),
+                cell(_size(item["height"]), "right", TABLE_VALUE_COLOR),
+                cell(_fmt(item["area"]), "right", TABLE_VALUE_COLOR),
+            ]
+        )
+    areas = [item["area"] for item in lines if item["area"] is not None]
+    cells.append(
+        [
+            cell("계"),
+            cell(_fmt(sum(item["distance"] for item in lines)), "right", TABLE_VALUE_COLOR),
+            cell(""),
+            cell(_fmt(sum(areas)) if areas else "", "right", TABLE_VALUE_COLOR),
+        ]
+    )
+    return table_entity(
+        f"{drawing_id}:table",
+        origin,
+        list(_COLUMNS),
+        [_ROW_H] * len(cells),
+        cells,
+        TABLE_LAYER_ID,
+        TABLE_COLOR,
+        _TABLE_FONT,
+        TABLE_LABEL_COLOR,
+    )
+
+
+def build_development_drawing(
+    drawing_id: str, sheet: dict[str, Any], interval_m: float
+) -> dict[str, Any]:
+    """전개도 한 장 → {format, entities, layers} — 작도 영역에 그대로 놓고 도각을 두름."""
+    area = drawing_area()
+    ax0, ay0, ax1, ay1 = area
+    rows = sheet["rows"]
+    lines = table_rows(rows, interval_m)
+    label = "B" if sheet["group"] in ("concrete", "gravel") else "H"
+    table_w, table_h = sum(_COLUMNS), _ROW_H * (len(lines) + 3)
+    table_box = (ax1 - _MARGIN - table_w, ay0 + _MARGIN, ax1 - _MARGIN, ay0 + _MARGIN + table_h)
+    denominator, placed = _choose(rows, area, table_box)
+
+    def station(chainage: float) -> str:
+        return station_text(chainage, interval_m)
+
+    entities: list[dict[str, Any]] = [
+        _text_entity(
+            f"{drawing_id}:title",
+            sheet["title"],
+            (ax0 + ax1) / 2,
+            ay1 - 14.0,
+            LABEL_LAYER_ID,
+            _TITLE_FONT,
+            TABLE_LABEL_COLOR,
+        ),
+        _text_entity(
+            f"{drawing_id}:scale",
+            f"S=1:{denominator:,}",
+            ax1 - _MARGIN,
+            ay1 - 14.0,
+            LABEL_LAYER_ID,
+            _FONT,
+            TABLE_LABEL_COLOR,
+            "right",
+        ),
+    ]
+    for index, (row, *box) in enumerate(placed or []):
+        entities += _box_entities(drawing_id, index, row, tuple(box), label, station)
+    entities.append(_table(drawing_id, lines, label, (table_box[0], table_box[3])))
+    if sheet.get("missing"):
+        entities.append(
+            _text_entity(
+                f"{drawing_id}:missing",
+                f"길이 미입력 {sheet['missing']}곳 — 그리지 않음",
+                table_box[2],
+                table_box[3] + 4.0,
+                LABEL_LAYER_ID,
+                _FONT,
+                TABLE_VALUE_COLOR,
+                "right",
+            )
+        )
+    if not rows and not sheet.get("missing"):
+        entities.append(
+            _text_entity(
+                f"{drawing_id}:empty",
+                "그릴 구조물이 없습니다 — 목록을 새로 고침",
+                (ax0 + ax1) / 2,
+                (ay0 + ay1) / 2,
+                LABEL_LAYER_ID,
+                _FONT * 2,
+                TABLE_VALUE_COLOR,
+            )
+        )
+    title = sheet["title"]
+    entities += frame_entities(
+        drawing_id,
+        area,
+        fit=False,
+        bottom_left=True,
+        fields={"도면명": title, **scale_fields(("", denominator))},
+    )
+    return {
+        "format": DRAWING_FORMAT,
+        "entities": entities,
+        "layers": [
+            _layer(BOX_LAYER_ID, "전개도 박스"),
+            _layer(FILL_LAYER_ID, "재질 무늬"),
+            _layer(LABEL_LAYER_ID, "측점 · 치수"),
+            _layer(TABLE_LAYER_ID, "전개도 표"),
+            _layer(FRAME_LAYER_ID, "도각", locked=True),
+        ],
+    }
diff --git a/B07_DesignDetail/B07_DesignDetail_Router.py b/B07_DesignDetail/B07_DesignDetail_Router.py
index 26d1cd72a..291e865da 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router.py
@@ -27,6 +27,7 @@ from B06_Section.B06_Section_Repository import (
     get_project_standard_cross_section,
     merge_cross_section_design_by_round,
 )
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Development import DEVELOPMENT_ID
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Sheet import (
     CROSS_SHEET_ID,
 )
@@ -344,6 +345,9 @@ async def get_design_drawing(
                     if row
                     else None
                 )
+        elif DEVELOPMENT_ID.fullmatch(drawing_id):
+            # 전개도 — 추가 흙막이 단 수 · 포장 빈 폭을 측점별 설계에서 읽음(377)
+            source_design = await _designs_by_chainage(route_id)
         elif PLAN_KIND_ID.fullmatch(drawing_id):
             # 계획평면도 — 정보 조각을 서버가 계산 · 파일로 두고 그 종류가 고른 것만 얹는다.
             context, reason = await load_drainage_context(project_id)
diff --git a/B07_DesignDetail/B07_DesignDetail_Router_Support.py b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
index 31b2b8965..d961ffe21 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router_Support.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
@@ -34,6 +34,11 @@ from B07_DesignDetail.B07_DesignDetail_Engine_Cad_CulvertNote import (
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_CulvertNote import (
     station_no_label as station_no_label_upper,
 )
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Development import (
+    DEVELOPMENT_ID,
+    development_list,
+    read_development,
+)
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Long import (
     build_longitudinal_drawing,
     longitudinal_chunks,
@@ -249,6 +254,8 @@ def _drawing_list(project_root: Path, longitudinal_path: Path) -> list[DesignDra
         )
     # 구조물 도면(376) — 맨 뒤에 덧붙임(앞 도면번호 안 밀림) · 조합마다 한 장 · 더한장은 장마다.
     drawings.extend(structure_items(project_root, manifest_drawings))
+    # 전개도(요구 241 · 377) — 맨 뒤 · (구조물 종류 · 형태)마다 장
+    drawings += development_list(project_root, manifest_drawings)
     _store_drawing_numbers(project_root, drawings)
     return drawings
 
@@ -488,6 +495,8 @@ def _read_drawing(
                 kind = "plan"
             elif drawing_id.startswith(STRUCTURE_PREFIX):
                 kind = "structure"
+            elif DEVELOPMENT_ID.fullmatch(drawing_id):
+                kind = "development"
             else:
                 kind = "longitudinal" if _LONG_ID.fullmatch(drawing_id) else "cross"
             label = str(manifest_entry.get("label") or drawing_id)
@@ -539,6 +548,10 @@ def _read_drawing(
             None,
         )
 
+    if DEVELOPMENT_ID.fullmatch(drawing_id):
+        # stored_design = 노선 전체 측점별 설계(추가 흙막이 단 수 · 포장 빈 폭)
+        return read_development(project_root, longitudinal_path, drawing_id, stored_design)
+
     if PLAN_KIND_ID.fullmatch(drawing_id):
         # stored_design = plan_kind_source()가 계산 · 저장한 조각 중 그 종류가 고른 것.
         if not isinstance(stored_design, dict):
diff --git a/B07_DesignDetail/B07_DesignDetail_Schema.py b/B07_DesignDetail/B07_DesignDetail_Schema.py
index 353b2a7af..de5f4376e 100644
--- a/B07_DesignDetail/B07_DesignDetail_Schema.py
+++ b/B07_DesignDetail/B07_DesignDetail_Schema.py
@@ -22,6 +22,7 @@ class DesignDrawingItem(BaseModel):
         "cross_standard",
         # 구조물 도면(376) — B05 · B06 배치에 연결된 구조물 조합 도면.
         "structure",
+        "development",  # 전개도(요구 241 · 377)
         "blank",
     ]
     label: str
@@ -64,6 +65,7 @@ class DesignDrawingResponse(BaseModel):
         "cross_standard",
         # 구조물 도면(376) — B05 · B06 배치에 연결된 구조물 조합 도면.
         "structure",
+        "development",  # 전개도(요구 241 · 377)
         "blank",
     ]
     label: str
diff --git a/B07_DesignDetail/B07_DesignDetail_UI_Development.ts b/B07_DesignDetail/B07_DesignDetail_UI_Development.ts
new file mode 100644
index 000000000..a91ad770d
--- /dev/null
+++ b/B07_DesignDetail/B07_DesignDetail_UI_Development.ts
@@ -0,0 +1,50 @@
+/* =============================================================================
+ * B07_DesignDetail_UI_Development.ts
+ * 좌측 「전개도」 카드(요구 241 · PLAN 377) — 늘 카드 · 구조물 종류마다 하위 묶음(이름 줄 + 형태 단추).
+ *
+ * 묶음 = `groupPlanSheets`(plan_kind = 구조물 종류 · plan_kind_name = 이름) 재사용 · 모양 = 평면도 묶음 class.
+ * 단추 글 = 장 이름에서 종류 이름 · 「전개도」를 뺀 형태(전체 이름은 툴팁).
+ * ========================================================================== */
+
+import { createPanelCard } from "@ui/ui_template_collapsible";
+import type { DesignDrawingItem } from "./B07_DesignDetail_Api_Fetch";
+import { groupPlanSheets } from "./B07_DesignDetail_UI_PlanKinds";
+
+/** 「관보호공 돌쌓기(찰) 전개도 (2)」 → 「돌쌓기(찰) (2)」 · 포장 「콘크리트포장 전개도」 → 「콘크리트포장」. */
+function shortLabel(label: string, kindName: string): string {
+  const rest = label.replace(" 전개도", "");
+  return rest.startsWith(`${kindName} `) ? rest.slice(kindName.length + 1) : rest;
+}
+
+export function buildDevelopmentSection(
+  items: DesignDrawingItem[],
+  makeButton: (drawing: DesignDrawingItem, label: string) => HTMLButtonElement,
+  collapsed = false,
+): HTMLElement {
+  const section = createPanelCard(`전개도 ${items.length}`, collapsed);
+  section.classList.add("b07-drawing-group");
+  section.dataset.kind = "development";
+  if (items.length === 0) {
+    const empty = document.createElement("span");
+    empty.className = "b07-plan-kind__name";
+    empty.textContent = "종단 길이를 가진 구조물이 없습니다.";
+    section.append(empty);
+    return section;
+  }
+  for (const { kindId, name, sheets } of groupPlanSheets(items)) {
+    const block = document.createElement("div");
+    block.className = "b07-plan-kind";
+    block.dataset.planKind = kindId;
+    const title = document.createElement("span");
+    title.className = "b07-plan-kind__name";
+    title.textContent = name;
+    block.append(title);
+    for (const { drawing } of sheets) {
+      const button = makeButton(drawing, shortLabel(drawing.label, name));
+      button.title = drawing.label;
+      block.append(button);
+    }
+    section.append(block);
+  }
+  return section;
+}
diff --git a/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts b/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
index e45c4d2d0..0144eef44 100644
--- a/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
+++ b/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
@@ -10,6 +10,7 @@ import { attachCollapsible, createPanelCard } from "@ui/ui_template_collapsible"
 import { createButton, createInputField, showToast } from "@ui/ui_template_elements";
 import { currentLanguageIndex, ui_locales } from "@ui/ui_template_locale";
 import type { CrossDesignInfo, DesignDrawingItem } from "./B07_DesignDetail_Api_Fetch";
+import { buildDevelopmentSection } from "./B07_DesignDetail_UI_Development";
 import { buildPlanSection } from "./B07_DesignDetail_UI_PlanKinds";
 import { openPlanManager, type PlanManageControls } from "./B07_DesignDetail_UI_PlanManage";
 
@@ -39,6 +40,8 @@ export const DRAWING_GROUPS: readonly {
   { label: "토적도(유토곡선)", kind: "mass_haul" },
   // 구조물 도면(376) — B05 · B06 배치에 연결된 구조물 조합마다 한 장(더한장은 장마다) · 늘 묶음.
   { label: "구조물 도면", kind: "structure" },
+  // 전개도(요구 241 · 377) — 늘 카드 · 구조물 종류마다 하위 묶음
+  { label: "전개도", kind: "development" },
 ];
 
 /** 311 기본 접힘 묶음 — 그 밖 묶음(토적도 등)은 기본 펼침. */
@@ -122,6 +125,11 @@ export function buildDrawingSidePanel(
       );
       continue;
     }
+    if (group.kind === "development") {
+      const sheets = drawings.filter((item) => item.kind === "development");
+      panel.append(buildDevelopmentSection(sheets, drawingButton, isFolded("development")));
+      continue;
+    }
     const items = group.kind
       ? drawings.filter((item) => item.kind === group.kind)
       : group.idPrefix
diff --git a/resources/tester/test_241_development.py b/resources/tester/test_241_development.py
new file mode 100644
index 000000000..61f11ffaa
--- /dev/null
+++ b/resources/tester/test_241_development.py
@@ -0,0 +1,292 @@
+# -*- coding: utf-8 -*-
+"""B07 전개도(요구 241-2 · 3 · PLAN 377-1) — 측점 표기 · 묶음 · 거리 · 면적 · 계 · 그림 · DXF.
+
+견본(그림 241 콘크리트포장): No.22+00~No.26+05 = 85 m × B 3.5 = 297.5 ㎡ (측점 간격 20 m).
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+from B05_Profile.B05_Profile_Structures_Repository import structures_file_path
+from B07_DesignDetail import B07_DesignDetail_Engine_Cad_Development as dev
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Development_Draw import (
+    FILL_LAYER_ID,
+    build_development_drawing,
+    fill_entities,
+)
+from B07_DesignDetail.B07_DesignDetail_Engine_Frame_Export import drawing_to_dxf
+
+POINTS = [
+    {  # 관 Φ800 — 유입 찰 H2.0(전 3 · 후 3) · 유출 메 높이 빈칸(관경 최소 1.3) · 추가 흙막이 1 · 2
+        "chainage_m": 88.0,
+        "options": {
+            "pipe_diameter_mm": 800,
+            "inlet_type": "기슭막이",
+            "inlet_revet_form": "돌쌓기(찰)",
+            "inlet_revet_height_m": 2.0,
+            "inlet_revet_before_m": 3,
+            "inlet_revet_after_m": 3,
+            "outlet_type": "기슭막이",
+            "outlet_revet_form": "돌쌓기(메)",
+            "outlet_revet_length_m": 8,  # 전 · 후 빈칸 → 반씩
+            "soil_add_1_form": "돌쌓기(메)",
+            "soil_add_1_height": 1.5,
+            "soil_add_1_before": 2,
+            "soil_add_1_after": 4.5,
+            "soil_add_2_form": "돌쌓기(메)",
+            "soil_add_2_height": 1.5,
+        },
+    },
+    {  # 박스 — 유출 흙막이(높이 빈칸 = 박스 높이 2.5) · 유입 날개벽
+        "chainage_m": 300.0,
+        "facility": "box_culvert",
+        "options": {
+            "body_height_m": 2.5,
+            "wing_in": "날개벽",
+            "wing_out": "흙막이",
+            "outlet_revet_form": "돌쌓기(메)",
+            "outlet_revet_before_m": 3,
+            "outlet_revet_after_m": 3,
+        },
+    },
+]
+STRUCTURES = [
+    {  # 콘크리트 포장 No.22+00 ~ No.26+05 · 폭 3.5
+        "type_id": "pavement_concrete",
+        "placement": "interval",
+        "start_m": 440.0,
+        "end_m": 525.0,
+        "options": {"width_m": 3.5},
+    },
+    {  # 폭 빈칸 = 횡단 노폭 구간 평균
+        "type_id": "pavement_concrete",
+        "placement": "interval",
+        "start_m": 720.0,
+        "end_m": 760.0,
+        "options": {},
+    },
+    {  # 흙막이 메 H2.0 + 추가 단 하나(찰 H1.0 = 별도 박스 · 찰 장)
+        "type_id": "soil_guard",
+        "placement": "interval",
+        "start_m": 80.0,
+        "end_m": 88.0,
+        "options": {
+            "form": "돌쌓기(메)",
+            "height_m": 2.0,
+            "tier_1_form": "돌쌓기(찰)",
+            "tier_1_height": 1.0,
+        },
+    },
+    {  # 숨김 벽 종류(돌쌓기(메)) = 흙막이 묶음 · 높이 빈칸
+        "type_id": "masonry_dry",
+        "placement": "interval",
+        "start_m": 100.0,
+        "end_m": 110.0,
+        "options": {"height_m": None},
+    },
+    {  # 옹벽 — 형태 = wall_form(form 은 형식)
+        "type_id": "retaining_wall",
+        "placement": "interval",
+        "start_m": 200.0,
+        "end_m": 210.0,
+        "options": {"form": "중력식", "wall_form": "콘크리트", "height_m": 3.0},
+    },
+]
+DESIGNS = {
+    88.0: {"extra_walls": [{"side": "outlet"}]},  # 유출 다단 1 → 추가 흙막이 2 는 안 섬
+    720.0: {"carriageway_width_m": 4.0},
+    740.0: {"carriageway_width_m": 5.0},
+    760.0: {"carriageway_width_m": 4.5},
+}
+
+
+@pytest.fixture
+def root(tmp_path: Path) -> Path:
+    found = tmp_path / "proj"
+    edits = found / "B04_PreProcess/drainage/edits"
+    edits.mkdir(parents=True)
+    (edits / "pipe_points.json").write_text(
+        json.dumps({"points": [{**p, "source": "user"} for p in POINTS]}, ensure_ascii=False),
+        encoding="utf-8",
+    )
+    path = Path(structures_file_path(str(found)))
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(
+        json.dumps({"revision": 1, "structures": STRUCTURES}, ensure_ascii=False), encoding="utf-8"
+    )
+    return found
+
+
+def _sheet(sheets, sheet_id):
+    return next(s for s in sheets if s["id"] == sheet_id)
+
+
+def test_측점_표기():
+    assert dev.station_text(440.0, 20) == "No.22+00"
+    assert dev.station_text(525.0, 20) == "No.26+05"
+    assert dev.station_text(88.0, 20) == "No.04+08"
+    assert dev.station_text(445.5, 20) == "No.22+05.5"
+    assert dev.station_text(459.98, 20) == "No.23+00"
+
+
+def test_그림_예_거리_면적_계():
+    rows = [
+        dev._row("concrete", "", 440.0, 525.0, 3.5, "a"),
+        dev._row("concrete", "", 720.0, 860.0, 3.5, "b"),
+    ]
+    lines = dev.table_rows(rows, 20.0)
+    assert lines[0] == {
+        "station": "No.22+00~No.26+05",
+        "distance": 85.0,
+        "height": 3.5,
+        "area": 297.5,
+    }
+    assert lines[1]["area"] == 490.0
+    drawing = build_development_drawing(
+        "development_concrete",
+        {
+            "title": "콘크리트포장 전개도",
+            "group": "concrete",
+            "form": "",
+            "rows": rows,
+            "missing": 0,
+        },
+        20.0,
+    )
+    table = next(e for e in drawing["entities"] if e["type"] == "Table")
+    cells = table["shapeData"]["cells"]
+    assert cells[0][2]["text"] == "폭"
+    assert [c["text"] for c in cells[2]] == ["No.22+00~No.26+05", "85.0", "3.5", "297.5"]
+    assert [c["text"] for c in cells[-1]] == ["계", "225.0", "", "787.5"]
+
+
+def test_묶음_거리_높이(root):
+    sheets = dev.development_sheets(dev.development_rows(root, DESIGNS))
+    ids = [s["id"] for s in sheets]
+    # 차례 = 관보호공 → BOX → 흙막이 → 옹벽 → 콘크리트포장 · 형태마다 한 장
+    assert ids == [
+        "development_pipe0",
+        "development_pipe1",
+        "development_box1",
+        "development_soil0",
+        "development_soil1",
+        "development_wall2",
+        "development_concrete",
+    ]
+    pipe = _sheet(sheets, "development_pipe0")
+    assert pipe["title"] == "관보호공 돌쌓기(찰) 전개도"
+    assert [(r["start_m"], r["end_m"], r["height_m"]) for r in pipe["rows"]] == [(85.0, 91.0, 2.0)]
+    meh = _sheet(sheets, "development_pipe1")["rows"]
+    # 유출 길이 8 반씩(84~92 · 높이 빈칸 = 관경 최소 1.3) · 추가 흙막이 1(86~92.5) · 2 는 다단 밖
+    assert [(r["start_m"], r["end_m"], r["height_m"]) for r in meh] == [
+        (84.0, 92.0, 1.3),
+        (86.0, 92.5, 1.5),
+    ]
+    box = _sheet(sheets, "development_box1")
+    assert box["title"] == "BOX암거 흙막이 돌쌓기(메) 전개도"
+    assert [(r["start_m"], r["end_m"], r["height_m"]) for r in box["rows"]] == [(297.0, 303.0, 2.5)]
+    # 추가 단 = 별도 박스(자기 형태 장) · 숨김 돌쌓기(메) = 흙막이 묶음 · 높이 빈칸
+    assert [(r["height_m"]) for r in _sheet(sheets, "development_soil0")["rows"]] == [1.0]
+    soil = _sheet(sheets, "development_soil1")["rows"]
+    assert [(r["start_m"], r["height_m"]) for r in soil] == [(80.0, 2.0), (100.0, None)]
+    wall = _sheet(sheets, "development_wall2")
+    assert wall["title"] == "옹벽 콘크리트 전개도" and wall["rows"][0]["height_m"] == 3.0
+    pave = _sheet(sheets, "development_concrete")
+    assert pave["title"] == "콘크리트포장 전개도"
+    assert [r["height_m"] for r in pave["rows"]] == [3.5, 4.5]  # 빈 폭 = (4 + 5 + 4.5) / 3
+    # 표 · 끝 글 = 면적이 쓴 폭 그대로(3.55 를 3.5 로 줄여 보이지 않음)
+    odd = {**pave, "rows": [{**pave["rows"][0], "height_m": 3.55}]}
+    drawing = build_development_drawing(odd["id"], odd, 20.0)
+    cells = next(e for e in drawing["entities"] if e["type"] == "Table")["shapeData"]["cells"]
+    assert [c["text"] for c in cells[2]] == ["No.22+00~No.26+05", "85.0", "3.55", "301.8"]
+    labels = [e["shapeData"]["label"] for e in drawing["entities"] if e["type"] == "Text"]
+    assert "B=3.55" in labels
+
+
+def test_설계_없으면_단수_안_거름_목록(root):
+    rows = dev.development_rows(root)
+    meh = [r for r in rows if r["group"] == "pipe" and r["form"] == "돌쌓기(메)"]
+    assert len(meh) == 3  # 추가 흙막이 2 도(단 수 모름) · 2 는 길이 빈칸
+    sheet = _sheet(dev.development_sheets(rows), "development_pipe1")
+    assert sheet["missing"] == 1 and len(sheet["rows"]) == 2
+    items = dev.development_list(root, {})
+    assert {i.kind for i in items} == {"development"}
+    assert (items[0].plan_kind, items[0].plan_kind_name) == ("development_pipe", "관보호공")
+    assert items[0].label == "관보호공 돌쌓기(찰) 전개도"
+
+
+def test_넘치면_2장():
+    rows = [dev._row("soil", "돌망태", i * 20.0, i * 20.0 + 6, 2.0, str(i)) for i in range(35)]
+    sheets = dev.development_sheets(rows)
+    assert [s["id"] for s in sheets] == ["development_soil3", "development_soil3_2"]
+    assert [len(s["rows"]) for s in sheets] == [30, 5]
+    assert sheets[1]["title"] == "흙막이 돌망태 전개도 (2)"
+
+
+def test_높이_빈칸_박스와_미입력_글_무늬_DXF(root):
+    sheets = dev.development_sheets(dev.development_rows(root, DESIGNS))
+    sheet = _sheet(sheets, "development_soil1")
+    drawing = build_development_drawing(sheet["id"], sheet, 20.0)
+    texts = [e["shapeData"]["label"] for e in drawing["entities"] if e["type"] == "Text"]
+    assert "흙막이 돌쌓기(메) 전개도" in texts
+    assert "No.04+00" in texts and "No.05+10" in texts
+    assert "H=2.0" in texts and "H=미입력" in texts and "L=8.0m" in texts
+    fills = [e for e in drawing["entities"] if e["layerId"] == FILL_LAYER_ID]
+    assert len(fills) > 10  # 돌 무늬
+    table = next(e for e in drawing["entities"] if e["type"] == "Table")
+    assert [c["text"] for c in table["shapeData"]["cells"][-1]] == ["계", "18.0", "", "16.0"]
+    # 같은 자료 = 같은 그림(씨앗 고정)
+    assert build_development_drawing(sheet["id"], sheet, 20.0) == drawing
+    dxf, _skipped = drawing_to_dxf(drawing)
+    text = dxf.decode("utf-8", "ignore")
+    assert "b07-dev-fill" in text and "No.04+00" in text and "297.5" not in text
+    assert text.count("LINE\r\n") > 50  # 돌 무늬 = 선(DXF 에도 남음)
+
+
+@pytest.mark.parametrize(
+    "form", ["돌쌓기(찰)", "돌쌓기(메)", "돌망태", "통나무·목재틀", "콘크리트"]
+)
+def test_무늬는_박스_안(form):
+    for seed in range(30):
+        width, height = 10 + seed * 9.7, 8 + seed % 7 * 5.0
+        for entity in fill_entities(f"s{seed}", form, "soil", (0.0, 0.0, width, height)):
+            for one in entity.get("children") or [entity]:
+                shape = one["shapeData"]
+                if "center" in shape:
+                    r, (x, y) = shape["radius"], (shape["center"]["x"], shape["center"]["y"])
+                    points = [(x - r, y - r), (x + r, y + r)]
+                else:
+                    points = [(p["x"], p["y"]) for p in (shape["startPoint"], shape["endPoint"])]
+                for x, y in points:
+                    assert -1e-6 <= x <= width + 1e-6 and -1e-6 <= y <= height + 1e-6, (seed, x, y)
+
+
+def test_목록_전_장_없으면_빈_장(root, tmp_path):
+    long_path = tmp_path / "long.json"
+    long_path.write_text(json.dumps({"stations": []}), encoding="utf-8")
+    kind, label, drawing, confirmed, _ = dev.read_development(
+        root, long_path, "development_pipe1_3", DESIGNS
+    )
+    assert kind == "development" and label == "관보호공 돌쌓기(메) 전개도" and not confirmed
+    with pytest.raises(ValueError):
+        dev.read_development(root, long_path, "development_x-1", DESIGNS)
+
+
+def test_확정본은_전개도_kind_로_읽음(root, tmp_path):
+    from B07_DesignDetail.B07_DesignDetail_Engine_Cad import DRAWING_FORMAT
+    from B07_DesignDetail.B07_DesignDetail_Router_Support import _design_root, _read_drawing
+
+    stage = _design_root(root)
+    (stage / "drawings").mkdir(parents=True)
+    saved = {"format": DRAWING_FORMAT, "entities": [], "layers": []}
+    (stage / "drawings" / "development_pipe0.json").write_text(json.dumps(saved), "utf-8")
+    manifest = {"drawings": {"development_pipe0": {"confirmed": True, "label": "관보호공"}}}
+    (stage / "manifest.json").write_text(json.dumps(manifest, ensure_ascii=False), "utf-8")
+    kind, label, drawing, confirmed, table = _read_drawing(
+        root, tmp_path / "long.json", "development_pipe0"
+    )
+    assert (kind, label, confirmed, table) == ("development", "관보호공", True, None)
diff --git a/resources/tester/test_311_panel_folded.py b/resources/tester/test_311_panel_folded.py
index 755ed6127..295101229 100644
--- a/resources/tester/test_311_panel_folded.py
+++ b/resources/tester/test_311_panel_folded.py
@@ -65,6 +65,7 @@ def test_B07_첫_그림_접힘(out):
         "cross": True,
         "mass_haul": False,
         "structure": False,  # 376-2 늘 카드 · 기본 펼침
+        "development": False,  # 377 전개도 카드 — 기본 펼침
     }
 
 
@@ -75,6 +76,7 @@ def test_B07_다시_세워도_접힘_이어_받음(out):
         "cross": False,
         "mass_haul": True,
         "structure": False,
+        "development": False,
     }