diff --git a/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts b/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts
index accd314c..2a29b156 100644
--- a/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts
+++ b/B07_DesignDetail/B07_DesignDetail_Api_Fetch.ts
@@ -5,7 +5,14 @@ import { API_BASE_URL, API_TIMEOUT_MS } from "@config/config_frontend";
 export interface DesignDrawingItem {
   id: string;
   // blank: 아직 내용을 만들지 않은 도면 — 도각만 실려 온다.
-  kind: "cover" | "longitudinal" | "cross" | "mass_haul" | "watershed" | "blank";
+  kind:
+    | "cover"
+    | "longitudinal"
+    | "cross"
+    | "mass_haul"
+    | "watershed"
+    | "plan"
+    | "blank";
   label: string;
   chainage_m: number | null;
   confirmed: boolean;
@@ -67,7 +74,10 @@ export interface CrossDesignInfo {
   cross_slope_pct?: number;
   paved?: boolean;
   ditch: DitchSpec;
-  road_edges?: Record<"left" | "right", { offset_m: number; elevation_m: number }>;
+  road_edges?: Record<
+    "left" | "right",
+    { offset_m: number; elevation_m: number }
+  >;
   design_elevation_m: number;
   cut_area_m2: number;
   fill_area_m2: number;
@@ -80,7 +90,14 @@ export interface DesignDrawingResponse {
   route_id: number;
   id: string;
   // blank: 아직 내용을 만들지 않은 도면 — 도각만 실려 온다.
-  kind: "cover" | "longitudinal" | "cross" | "mass_haul" | "watershed" | "blank";
+  kind:
+    | "cover"
+    | "longitudinal"
+    | "cross"
+    | "mass_haul"
+    | "watershed"
+    | "plan"
+    | "blank";
   label: string;
   drawing: CadDrawing;
   confirmed: boolean;
@@ -97,7 +114,10 @@ export interface DesignDrawingConfirmResponse {
   design?: CrossDesignInfo | null;
 }
 
-async function requestJson<T>(path: string, init: RequestInit = {}): Promise<T> {
+async function requestJson<T>(
+  path: string,
+  init: RequestInit = {},
+): Promise<T> {
   const controller = new AbortController();
   const timeoutId = window.setTimeout(() => controller.abort(), API_TIMEOUT_MS);
   try {
@@ -108,14 +128,17 @@ async function requestJson<T>(path: string, init: RequestInit = {}): Promise<T>
       signal: controller.signal,
     });
     const payload = (await response.json()) as T & { message?: string };
-    if (!response.ok) throw new Error(payload.message ?? `HTTP ${response.status}`);
+    if (!response.ok)
+      throw new Error(payload.message ?? `HTTP ${response.status}`);
     return payload;
   } finally {
     window.clearTimeout(timeoutId);
   }
 }
 
-export function fetchDesignDrawingList(projectId: string): Promise<DesignDrawingListResponse> {
+export function fetchDesignDrawingList(
+  projectId: string,
+): Promise<DesignDrawingListResponse> {
   return requestJson(`/projects/${projectId}/design-drawings`);
 }
 
@@ -123,7 +146,9 @@ export function fetchDesignDrawing(
   projectId: string,
   drawingId: string,
 ): Promise<DesignDrawingResponse> {
-  return requestJson(`/projects/${projectId}/design-drawings/${encodeURIComponent(drawingId)}`);
+  return requestJson(
+    `/projects/${projectId}/design-drawings/${encodeURIComponent(drawingId)}`,
+  );
 }
 
 export function confirmDesignDrawing(
@@ -141,7 +166,10 @@ export function confirmDesignDrawing(
   );
 }
 
-export function invalidateDesignDrawing(projectId: string, drawingId: string): Promise<void> {
+export function invalidateDesignDrawing(
+  projectId: string,
+  drawingId: string,
+): Promise<void> {
   return requestJson(
     `/projects/${projectId}/design-drawings/${encodeURIComponent(drawingId)}/invalidate`,
     { method: "POST" },
@@ -157,11 +185,16 @@ export interface FrameTemplateResponse {
   customized: boolean;
 }
 
-export function fetchFrameTemplate(projectId: string): Promise<FrameTemplateResponse> {
+export function fetchFrameTemplate(
+  projectId: string,
+): Promise<FrameTemplateResponse> {
   return requestJson(`/projects/${projectId}/frame-template`);
 }
 
-export function saveFrameTemplate(projectId: string, drawing: CadDrawing): Promise<void> {
+export function saveFrameTemplate(
+  projectId: string,
+  drawing: CadDrawing,
+): Promise<void> {
   return requestJson(`/projects/${projectId}/frame-template`, {
     method: "PUT",
     body: JSON.stringify({ drawing }),
diff --git a/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Plan.py b/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Plan.py
new file mode 100644
index 00000000..18da7be6
--- /dev/null
+++ b/B07_DesignDetail/B07_DesignDetail_Engine_Cad_Plan.py
@@ -0,0 +1,388 @@
+"""B07 계획평면도 CAD 조립 — 수치등고선 배경 위에 노선·측점·구조물을 얹는다.
+
+세 장이 같은 배경·같은 축척을 쓰고 주제만 다르다(2026-09-04 사용자 지시).
+
+  - 계획평면도(지형)     : 등고선·세류선만
+  - 계획평면도(노선배치도): 배경 + 계획노선 + 측점
+  - 계획평면도(배치도)   : 배경 + 계획노선 + 구조물 배치
+
+배경 자료는 유역도와 **같은 창구**(`B07_DesignDetail_Router_Support_Basin.map_background`)
+에서 온다 — 도엽 GeoJSON 읽기·좌표 환산은 한 번뿐이고 여러 도면이 그 결과를 나눠 쓴다.
+
+축척은 지식DB 「설계제원_총괄」 측량·도면 기준 **1/1,200 고정**이다. 횡단면도와 같은
+원칙으로, 한 장에 안 들어가면 축척을 줄이지 않고 **장을 나눈다**.
+
+좌표 규약: 종이 mm = (사업지 좌표 m - 그 장 콘텐츠 최소점) x MM (1/1,200 -> 1 m = 5/6 mm).
+"""
+
+import math
+from typing import Any
+
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad import (
+    DRAWING_FORMAT,
+    FRAME_LAYER_ID,
+    TABLE_LABEL_COLOR,
+    _layer,
+    _text_entity,
+    polyline_entity,
+    station_plus_label,
+)
+from B07_DesignDetail.B07_DesignDetail_Engine_Template import (
+    compass_entities,
+    entities_bbox,
+    frame_entities,
+    scale_fields,
+    usable_area,
+)
+from config.config_system import DRAWING_SCALE_PLAN
+
+# 도면 좌표 = 종이 mm. 실거리 1 m가 종이에서 차지하는 mm (1/1,200 -> 0.8333).
+MM = 1000.0 / DRAWING_SCALE_PLAN
+
+CONTOUR_LAYER_ID = "b07-plan-contour"
+CONTOUR_COLOR = "#6b7684"
+STREAM_LAYER_ID = "b07-plan-stream"
+STREAM_COLOR = "#4d9dff"
+ROUTE_LAYER_ID = "b07-plan-route"
+ROUTE_COLOR = "#ffe066"
+STATION_LAYER_ID = "b07-plan-station"
+STATION_COLOR = "#ff9d4d"
+STRUCTURE_LAYER_ID = "b07-plan-structure"
+STRUCTURE_COLOR = "#ff4d4d"
+TITLE_LAYER_ID = "b07-plan-title"
+
+_ROUTE_WIDTH = 3
+_TITLE_FONT_SIZE = 7.0
+_FONT_SIZE = 2.2
+_STATION_FONT_SIZE = 2.0
+_STATION_TICK_MM = 2.5  # 측점 눈금 반길이(종이 mm)
+_STRUCTURE_SIZE_MM = 3.0  # 구조물 기호 반크기(종이 mm)
+_STRUCTURE_FONT_SIZE = 2.2
+_TITLE_BAND = 22.0  # 제목·척도가 차지하는 위쪽 띠(mm)
+_COMPASS_SIZE = 26.0
+_COMPASS_MARGIN = 12.0
+
+# 세 장의 주제 (id 접두어, 도면명, 노선·측점·구조물을 그리는지).
+PLAN_KINDS: tuple[tuple[str, str, bool, bool, bool], ...] = (
+    ("plan_terrain", "계획평면도(지형)", False, False, False),
+    ("plan_route", "계획평면도(노선배치도)", True, True, False),
+    ("plan_layout", "계획평면도(배치도)", True, False, True),
+)
+PLAN_KIND_LABELS: dict[str, str] = {kind: label for kind, label, *_rest in PLAN_KINDS}
+
+# 구조물 종류별 표기 — pipe_points.json 의 facility 값 기준.
+_FACILITY_LABELS: dict[str, str] = {
+    "ford_bridge": "세월교",
+    "box_culvert": "BOX암거",
+    "bridge": "교량",
+}
+
+
+def plan_area_mm() -> tuple[float, float]:
+    """지형 배경이 차지할 수 있는 크기(mm) — A1 작도영역에서 방위표 칸과 제목 띠를 뺀다.
+
+    라우터는 이 크기를 축척으로 되돌려 등고선·세류선 절취 범위를 잡는다(정의처 한 곳).
+    """
+    width, height = usable_area()
+    return (width - (_COMPASS_MARGIN + _COMPASS_SIZE), height - _TITLE_BAND)
+
+
+def _chunk_span_m() -> tuple[float, float]:
+    """한 장이 담을 수 있는 실거리(m) — 도곽 지형 영역을 축척으로 되돌린 크기."""
+    area_w, area_h = plan_area_mm()
+    return (area_w * DRAWING_SCALE_PLAN / 1000.0, area_h * DRAWING_SCALE_PLAN / 1000.0)
+
+
+def plan_chunks(stations: list[tuple[float, float, float]]) -> list[dict[str, Any]]:
+    """노선을 한 장에 들어가는 구간으로 나눈다. 각 항목: {number, start_m, end_m}.
+
+    입력은 종단 측점의 (누가거리 m, x, y)다 — **도면 목록과 도면 생성이 같은 자료**를
+    보아야 장수가 어긋나지 않는다(종단도 분할과 같은 방식).
+
+    축척 1/1,200 은 고정이므로 한 장에 안 들어가면 **노선을 따라 장을 나눈다**
+    (2026-09-04 — 횡단면도와 같은 원칙). 경계 측점 1개를 중복시켜 장 사이에서 노선이
+    끊겨 보이지 않게 한다(납품 도면 관례).
+    """
+    ordered = sorted(stations, key=lambda item: item[0])
+    if len(ordered) < 2:
+        span = (ordered[0][0] if ordered else 0.0, ordered[0][0] if ordered else 0.0)
+        return [{"number": 1, "start_m": span[0], "end_m": span[1]}]
+    span_w, span_h = _chunk_span_m()
+
+    def fits(part: list[tuple[float, float, float]]) -> bool:
+        width = max(x for _c, x, _y in part) - min(x for _c, x, _y in part)
+        height = max(y for _c, _x, y in part) - min(y for _c, _x, y in part)
+        # 가로로 길든 세로로 길든 도곽에만 들어가면 된다 — 두 방향 다 본다.
+        return (width <= span_w and height <= span_h) or (width <= span_h and height <= span_w)
+
+    chunks: list[dict[str, Any]] = []
+    start = 0
+    while start < len(ordered) - 1:
+        end = start + 1
+        while end + 1 < len(ordered) and fits(ordered[start : end + 2]):
+            end += 1
+        chunks.append(
+            {
+                "number": len(chunks) + 1,
+                "start_m": float(ordered[start][0]),
+                "end_m": float(ordered[end][0]),
+            }
+        )
+        start = end  # 경계 측점 1개 중복
+    return chunks
+
+
+def plan_drawing_id(kind: str, chunk: dict[str, Any], total: int) -> str:
+    """장이 하나면 접두어 그대로, 여럿이면 `plan_route_2` 처럼 번호를 붙인다."""
+    return kind if total <= 1 else f"{kind}_{chunk['number']}"
+
+
+def plan_drawing_label(kind: str, chunk: dict[str, Any], total: int) -> str:
+    label = PLAN_KIND_LABELS.get(kind, kind)
+    return label if total <= 1 else f"{label} {chunk['number']}장"
+
+
+def _structure_label(structure: dict[str, Any]) -> str:
+    """구조물 표기 — 세월교·BOX암거는 이름, 배수관은 관경(mm)."""
+    facility = structure.get("facility")
+    if isinstance(facility, str) and facility in _FACILITY_LABELS:
+        return _FACILITY_LABELS[facility]
+    options = structure.get("options")
+    diameter = options.get("pipe_diameter_mm") if isinstance(options, dict) else None
+    return f"D{int(diameter)}" if isinstance(diameter, (int, float)) else "배수시설"
+
+
+def _station_entities(
+    drawing_id: str,
+    stations: list[tuple[float, float, float]],
+    interval_m: float,
+    paper: Any,
+) -> list[dict[str, Any]]:
+    """측점 눈금과 이름(No.n+00)을 노선 위에 직각으로 세운다.
+
+    입력은 **종단 측점**(누가거리 m, x, y)이다 — 노선 정점은 수백 개라 전부 찍으면
+    뭉개지고, 정점의 누가거리는 측점 간격의 배수가 아니라 걸러지지도 않는다
+    (2026-09-04 실측: 눈금이 2개만 찍혔음).
+    """
+    entities: list[dict[str, Any]] = []
+    for index, (chainage, x, y) in enumerate(stations):
+        point = (x, y)
+        before = stations[max(index - 1, 0)]
+        after = stations[min(index + 1, len(stations) - 1)]
+        dx, dy = after[1] - before[1], after[2] - before[2]
+        length = math.hypot(dx, dy) or 1.0
+        # 노선 진행 방향의 법선 — 눈금을 노선과 직각으로 세운다.
+        nx, ny = -dy / length, dx / length
+        cx, cy = paper(point)
+        tick = polyline_entity(
+            drawing_id,
+            [
+                (cx - nx * _STATION_TICK_MM, cy - ny * _STATION_TICK_MM),
+                (cx + nx * _STATION_TICK_MM, cy + ny * _STATION_TICK_MM),
+            ],
+            STATION_LAYER_ID,
+            STATION_COLOR,
+            suffix=f":tick:{index}",
+        )
+        if tick:
+            entities.append(tick)
+        entities.append(
+            _text_entity(
+                f"{drawing_id}:station:{index}",
+                station_plus_label(chainage, interval_m),
+                cx + nx * (_STATION_TICK_MM + 1.5),
+                cy + ny * (_STATION_TICK_MM + 1.5),
+                STATION_LAYER_ID,
+                _STATION_FONT_SIZE,
+                STATION_COLOR,
+            )
+        )
+    return entities
+
+
+def _structure_entities(
+    drawing_id: str,
+    structures: list[dict[str, Any]],
+    paper: Any,
+    box: tuple[float, float, float, float],
+) -> list[dict[str, Any]]:
+    """구조물 위치를 마름모 기호 + 이름으로 찍는다. 이 장의 범위 밖은 건너뛴다."""
+    entities: list[dict[str, Any]] = []
+    min_x, min_y, max_x, max_y = box
+    for index, structure in enumerate(structures):
+        x, y = structure.get("x"), structure.get("y")
+        if not isinstance(x, (int, float)) or not isinstance(y, (int, float)):
+            continue
+        if not (min_x <= x <= max_x and min_y <= y <= max_y):
+            continue
+        cx, cy = paper((float(x), float(y)))
+        size = _STRUCTURE_SIZE_MM
+        marker = polyline_entity(
+            drawing_id,
+            [
+                (cx, cy + size),
+                (cx + size, cy),
+                (cx, cy - size),
+                (cx - size, cy),
+                (cx, cy + size),
+            ],
+            STRUCTURE_LAYER_ID,
+            STRUCTURE_COLOR,
+            suffix=f":structure:{index}",
+        )
+        if marker:
+            entities.append(marker)
+        entities.append(
+            _text_entity(
+                f"{drawing_id}:structure:label:{index}",
+                _structure_label(structure),
+                cx + size + 1.0,
+                cy,
+                STRUCTURE_LAYER_ID,
+                _STRUCTURE_FONT_SIZE,
+                STRUCTURE_COLOR,
+            )
+        )
+    return entities
+
+
+def build_plan_drawing(
+    kind: str,
+    drawing_id: str,
+    label: str,
+    route_xy: list[tuple[float, float]],
+    stations: list[tuple[float, float, float]],
+    contours: list[list[tuple[float, float]]],
+    streams: list[list[tuple[float, float]]],
+    structures: list[dict[str, Any]],
+    interval_m: float = 20.0,
+) -> dict[str, Any]:
+    """계획평면도 한 장을 만든다. 좌표는 모두 사업지 CRS(m)로 받아 종이 mm로만 옮긴다.
+
+    `kind` 가 세 장 중 무엇을 그릴지 정한다(`PLAN_KINDS`). 배경은 세 장이 같다.
+    """
+    with_route, with_station, with_structure = next(
+        ((r, s, t) for name, _label, r, s, t in PLAN_KINDS if name == kind),
+        (True, False, False),
+    )
+    # 도곽 배치는 세 장이 같아야 한다 — 노선을 그리지 않는 지형도도 노선을 범위에 넣는다.
+    everything = [
+        *route_xy,
+        *(point for line in contours for point in line),
+        *(point for line in streams for point in line),
+    ]
+    if not everything:
+        raise FileNotFoundError(
+            "계획평면도에 그릴 좌표가 없습니다. B04 전처리에서 수치지형도 도엽을 먼저 받으세요."
+        )
+    min_x = min(x for x, _y in everything)
+    min_y = min(y for _x, y in everything)
+    max_x = max(x for x, _y in everything)
+    max_y = max(y for _x, y in everything)
+
+    def paper(point: tuple[float, float]) -> tuple[float, float]:
+        return ((point[0] - min_x) * MM, (point[1] - min_y) * MM)
+
+    entities: list[dict[str, Any]] = []
+    for index, line in enumerate(contours):
+        contour = polyline_entity(
+            drawing_id,
+            [paper(point) for point in line],
+            CONTOUR_LAYER_ID,
+            CONTOUR_COLOR,
+            suffix=f":contour:{index}",
+        )
+        if contour:
+            entities.append(contour)
+    for index, line in enumerate(streams):
+        stream = polyline_entity(
+            drawing_id,
+            [paper(point) for point in line],
+            STREAM_LAYER_ID,
+            STREAM_COLOR,
+            suffix=f":stream:{index}",
+        )
+        if stream:
+            entities.append(stream)
+
+    map_bbox = entities_bbox(entities)
+
+    # 노선·측점·구조물은 배경 위에 얹는다 — 아래에 깔리면 등고선에 묻힌다.
+    if with_route:
+        route = polyline_entity(
+            drawing_id,
+            [paper(point) for point in route_xy],
+            ROUTE_LAYER_ID,
+            ROUTE_COLOR,
+            width=_ROUTE_WIDTH,
+        )
+        if route:
+            entities.append(route)
+    if with_station and stations:
+        entities.extend(_station_entities(drawing_id, stations, interval_m, paper))
+    if with_structure:
+        entities.extend(
+            _structure_entities(drawing_id, structures, paper, (min_x, min_y, max_x, max_y))
+        )
+
+    # 방위표는 지형 오른쪽 칸 맨 위에 둔다(유역도와 같은 자리).
+    if map_bbox:
+        entities.extend(
+            compass_entities(
+                drawing_id,
+                (
+                    map_bbox[2] + _COMPASS_MARGIN + _COMPASS_SIZE / 2.0,
+                    map_bbox[3] - _COMPASS_SIZE / 2.0,
+                ),
+                _COMPASS_SIZE,
+            )
+        )
+
+    bbox = entities_bbox(entities)
+    if bbox:
+        min_bx, _min_by, max_bx, max_by = bbox
+        entities.append(
+            _text_entity(
+                f"{drawing_id}:title",
+                label,
+                (min_bx + max_bx) / 2.0,
+                max_by + 12.0,
+                TITLE_LAYER_ID,
+                _TITLE_FONT_SIZE,
+                TABLE_LABEL_COLOR,
+            )
+        )
+        entities.append(
+            _text_entity(
+                f"{drawing_id}:scale",
+                f"S = 1/{DRAWING_SCALE_PLAN:,}",
+                max_bx,
+                max_by + 5.0,
+                TITLE_LAYER_ID,
+                _FONT_SIZE,
+                TABLE_LABEL_COLOR,
+                align="right",
+            )
+        )
+        entities.extend(
+            frame_entities(
+                drawing_id,
+                entities_bbox(entities) or bbox,
+                fit=False,
+                fields={"도면명": label, **scale_fields(("", DRAWING_SCALE_PLAN))},
+            )
+        )
+
+    return {
+        "format": DRAWING_FORMAT,
+        "entities": entities,
+        "layers": [
+            _layer(CONTOUR_LAYER_ID, "등고선", locked=True),
+            _layer(STREAM_LAYER_ID, "계류", locked=True),
+            _layer(ROUTE_LAYER_ID, "계획노선"),
+            _layer(STATION_LAYER_ID, "측점"),
+            _layer(STRUCTURE_LAYER_ID, "구조물"),
+            _layer(TITLE_LAYER_ID, "표제"),
+            _layer(FRAME_LAYER_ID, "도각", locked=True),
+        ],
+    }
diff --git a/B07_DesignDetail/B07_DesignDetail_Router.py b/B07_DesignDetail/B07_DesignDetail_Router.py
index a46bba9a..f4777153 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router.py
@@ -35,13 +35,16 @@ from B07_DesignDetail.B07_DesignDetail_Engine_Template import (
 )
 from B07_DesignDetail.B07_DesignDetail_Router_Support import (
     MASS_HAUL_ID,
+    PLAN_ID,
     WATERSHED_ID,
     _cross_sheet_plan,
     _drawing_list,
     _invalidate_drawing,
     _read_drawing,
+    _read_json,
     _recompute_confirmed_design,
     _store_confirmed_drawing,
+    plan_source,
     watershed_source,
 )
 from B07_DesignDetail.B07_DesignDetail_Schema import (
@@ -300,6 +303,13 @@ async def get_design_drawing(
             if context is None:
                 return JSONResponse(status_code=404, content={"status": "error", "message": reason})
             source_design = await asyncio.to_thread(watershed_source, context)
+        elif PLAN_ID.fullmatch(drawing_id):
+            # 계획평면도는 유역도와 **같은 배경 창구**를 쓴다 — 자료 읽기·환산이 캐시된다.
+            context, reason = await load_drainage_context(project_id)
+            if context is None:
+                return JSONResponse(status_code=404, content={"status": "error", "message": reason})
+            longitudinal = await asyncio.to_thread(_read_json, longitudinal_path)
+            source_design = await asyncio.to_thread(plan_source, context, longitudinal, drawing_id)
         kind, label, drawing, confirmed, quantity_table = await asyncio.to_thread(
             _read_drawing, project_root, longitudinal_path, drawing_id, source_design
         )
diff --git a/B07_DesignDetail/B07_DesignDetail_Router_Support.py b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
index 0381742e..ef362b2a 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router_Support.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router_Support.py
@@ -26,6 +26,13 @@ from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Long import (
     longitudinal_chunks,
 )
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_MassHaul import build_mass_haul_drawing
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Plan import (
+    PLAN_KINDS,
+    build_plan_drawing,
+    plan_chunks,
+    plan_drawing_id,
+    plan_drawing_label,
+)
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Sheet import (
     CROSS_SHEET_ID,
     build_cross_sheet,
@@ -45,6 +52,9 @@ from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     CONTOUR_FILE as CONTOUR_FILE,
 )
+from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
+    PLAN_ID as PLAN_ID,
+)
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     STREAM_FILE as STREAM_FILE,
 )
@@ -69,6 +79,12 @@ from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     clip_line_to_box as clip_line_to_box,
 )
+from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
+    plan_source as plan_source,
+)
+from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
+    plan_stations as plan_stations,
+)
 from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import (
     watershed_source as watershed_source,
 )
@@ -100,9 +116,6 @@ COVER_ID = "cover"
 # 아직 내용을 만들지 않은 도면 — 도각만 실어 연다(2026-09-01 사용자 지시).
 # 화면 순서(DRAWING_GROUPS)와 같은 이름을 쓴다.
 BLANK_DRAWINGS: tuple[tuple[str, str], ...] = (
-    ("blank_plan_terrain", "계획평면도(지형)"),
-    ("blank_plan_route", "계획평면도(노선배치도)"),
-    ("blank_plan_layout", "계획평면도(배치도)"),
     ("blank_plan_lidar", "계획평면도(라이다)"),
     ("blank_cross_standard", "표준 횡단면도"),
     ("blank_standard", "표준도"),
@@ -151,6 +164,19 @@ def _drawing_list(
                 confirmed=bool(manifest_drawings.get(sheet["id"], {}).get("confirmed")),
             )
         )
+    # 계획평면도 3종 — 축척 1/1,200 고정이라 노선이 길면 장이 나뉜다(장수는 노선이 정한다).
+    plan_sheets = plan_chunks(plan_stations(longitudinal))
+    for kind, _label, *_rest in PLAN_KINDS:
+        for chunk in plan_sheets:
+            drawing_id = plan_drawing_id(kind, chunk, len(plan_sheets))
+            drawings.append(
+                DesignDrawingItem(
+                    id=drawing_id,
+                    kind="plan",
+                    label=plan_drawing_label(kind, chunk, len(plan_sheets)),
+                    confirmed=bool(manifest_drawings.get(drawing_id, {}).get("confirmed")),
+                )
+            )
     # 노선 전장 1장짜리 도면 — 자료가 없으면 여는 시점에 404로 알린다(목록에는 항상 둔다).
     for drawing_id, kind, label in (
         (COVER_ID, "cover", "표지"),
@@ -381,6 +407,8 @@ def _read_drawing(
         if saved.get("format") == DRAWING_FORMAT:
             if drawing_id in (COVER_ID, MASS_HAUL_ID, WATERSHED_ID):
                 kind = drawing_id  # id와 kind가 같은 단장 도면
+            elif PLAN_ID.fullmatch(drawing_id):
+                kind = "plan"
             else:
                 kind = "longitudinal" if _LONG_ID.fullmatch(drawing_id) else "cross"
             label = str(manifest_entry.get("label") or drawing_id)
@@ -409,6 +437,31 @@ def _read_drawing(
             None,
         )
 
+    if PLAN_ID.fullmatch(drawing_id):
+        # stored_design = plan_source()가 모아 준 노선·측점·배경·구조물 좌표(사업지 CRS).
+        if not isinstance(stored_design, dict):
+            raise FileNotFoundError("계획평면도 자료가 없습니다.")
+        longitudinal = _read_json(longitudinal_path)
+        interval = infer_station_interval(longitudinal.get("stations") or [])
+        label = str(stored_design.get("label") or drawing_id)
+        return (
+            "plan",
+            label,
+            build_plan_drawing(
+                str(stored_design.get("kind") or "plan_terrain"),
+                drawing_id,
+                label,
+                stored_design.get("route_xy") or [],
+                stored_design.get("stations") or [],
+                stored_design.get("contours") or [],
+                stored_design.get("streams") or [],
+                stored_design.get("structures") or [],
+                interval,
+            ),
+            False,
+            None,
+        )
+
     if drawing_id == WATERSHED_ID:
         # stored_design = watershed_source()가 모아 준 노선·유역·배경 좌표(사업지 CRS).
         if not isinstance(stored_design, dict):
diff --git a/B07_DesignDetail/B07_DesignDetail_Router_Support_Basin.py b/B07_DesignDetail/B07_DesignDetail_Router_Support_Basin.py
index f229cf17..73c52af0 100644
--- a/B07_DesignDetail/B07_DesignDetail_Router_Support_Basin.py
+++ b/B07_DesignDetail/B07_DesignDetail_Router_Support_Basin.py
@@ -7,6 +7,7 @@ import json
 import logging
 import math
 import re
+from functools import lru_cache
 from pathlib import Path
 from typing import Any
 
@@ -14,33 +15,19 @@ from pyproj import Transformer
 
 from B04_PreProcess.B04_PreProcess_Router_Watershed import CONTOUR_FILE, STREAM_FILE
 from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Basin import map_area_mm
+from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Plan import (
+    plan_area_mm,
+    plan_chunks,
+    plan_drawing_label,
+)
 from common_util.common_util_drainage_pipes import detail_basins_path
-from config.config_system import DRAWING_SCALE_BASIN
+from config.config_system import DRAWING_SCALE_BASIN, DRAWING_SCALE_PLAN
 
 logger = logging.getLogger(__name__)
 
 
-_STAGE_DIR = "B07_DesignDetail"
-
-_CROSS_ID = re.compile(r"^cross_(\d+)m$")
-_LONG_ID = re.compile(r"^longitudinal(?:_(\d+))?$")
-# 노선 전장에 한 장씩만 나오는 도면 — 라우터가 원본 자료를 따로 실어 넘긴다.
-MASS_HAUL_ID = "mass_haul"
-WATERSHED_ID = "watershed"
-COVER_ID = "cover"
-
-# 아직 내용을 만들지 않은 도면 — 도각만 실어 연다(2026-09-01 사용자 지시).
-# 화면 순서(DRAWING_GROUPS)와 같은 이름을 쓴다.
-BLANK_DRAWINGS: tuple[tuple[str, str], ...] = (
-    ("blank_plan_terrain", "계획평면도(지형)"),
-    ("blank_plan_route", "계획평면도(노선배치도)"),
-    ("blank_plan_layout", "계획평면도(배치도)"),
-    ("blank_plan_lidar", "계획평면도(라이다)"),
-    ("blank_cross_standard", "표준 횡단면도"),
-    ("blank_standard", "표준도"),
-    ("blank_landuse", "용지도"),
-)
-BLANK_LABELS: dict[str, str] = dict(BLANK_DRAWINGS)
+# 도면 id 상수·빈 도면 목록은 `B07_DesignDetail_Router_Support` 한 곳이 정본이다.
+# 이 모듈에 있던 같은 이름의 사본은 아무도 읽지 않으면서 값만 어긋나 지웠다(2026-09-04).
 
 
 def _geojson_payload(path: Path) -> dict[str, Any]:
@@ -185,26 +172,186 @@ def _too_far_from_route(
     return min(math.hypot(cx - x, cy - y) for x, y in route_xy) > _BASIN_MAX_DISTANCE_M
 
 
+@lru_cache(maxsize=8)
+def _metric_lines_cached(
+    path_str: str, mtime_ns: int, crs: str
+) -> tuple[tuple[tuple[float, float], ...], ...]:
+    """도엽 GeoJSON 한 벌을 사업지 좌표계(m) 선 목록으로 돌려 **캐시**한다.
+
+    같은 배경을 유역도와 계획평면도가 나눠 쓴다 — 도면마다 다시 읽고 다시 투영하면
+    한 장 여는 데 수 초가 걸린다(등고선 수만 점). 파일이 바뀌면 mtime 이 달라져
+    캐시가 저절로 갈린다(`_read_template` 와 같은 방식).
+    """
+    to_metric = Transformer.from_crs("EPSG:4326", crs, always_xy=True)
+    lines: list[tuple[tuple[float, float], ...]] = []
+    for feature in _geojson_features(Path(path_str)):
+        for part in _geometry_lines(feature.get("geometry")):
+            converted = tuple(
+                (float(x), float(y))
+                for x, y in (to_metric.transform(point[0], point[1]) for point in part)
+            )
+            if len(converted) >= 2:
+                lines.append(converted)
+    return tuple(lines)
+
+
+def _metric_lines(path: Path, crs: str) -> list[list[tuple[float, float]]]:
+    """캐시된 배경 선을 쓰기 좋은 형태로 낸다. 파일이 없으면 빈 목록."""
+    if not path.is_file():
+        return []
+    cached = _metric_lines_cached(str(path), path.stat().st_mtime_ns, crs)
+    return [list(line) for line in cached]
+
+
+def map_background(
+    project_root: Path,
+    crs: str,
+    scale: int,
+    area_mm: tuple[float, float],
+    extent_points: list[tuple[float, float]],
+) -> dict[str, list[list[tuple[float, float]]]]:
+    """도엽 등고선·세류선을 사업지 좌표계로 읽어 **그 도면의 도곽 크기로 절취**한다.
+
+    유역도·계획평면도·용지도가 같은 창구를 쓴다 — 자료 읽기·좌표 환산은 한 번뿐이고
+    (`_metric_lines` 캐시), 도면마다 다른 것은 축척과 도곽 크기뿐이다.
+
+    `extent_points` 는 그 도면의 주제(노선·유역 등) 좌표다. 도곽보다 크면 그쪽을
+    우선한다 — 배경만 잘리고 주제는 다 보인다.
+    """
+    area_w_mm, area_h_mm = area_mm
+    half_w_m = area_w_mm / 2.0 * scale / 1000.0
+    half_h_m = area_h_mm / 2.0 * scale / 1000.0
+    if extent_points:
+        center_x = (min(x for x, _y in extent_points) + max(x for x, _y in extent_points)) / 2.0
+        center_y = (min(y for _x, y in extent_points) + max(y for _x, y in extent_points)) / 2.0
+        box = (
+            min(center_x - half_w_m, min(x for x, _y in extent_points)),
+            min(center_y - half_h_m, min(y for _x, y in extent_points)),
+            max(center_x + half_w_m, max(x for x, _y in extent_points)),
+            max(center_y + half_h_m, max(y for _x, y in extent_points)),
+        )
+    else:
+        box = (-math.inf, -math.inf, math.inf, math.inf)
+
+    sheet_dir = Path(project_root) / "B04_PreProcess" / "processed"
+    background: dict[str, list[list[tuple[float, float]]]] = {}
+    for key, filename in (("contours", CONTOUR_FILE), ("streams", STREAM_FILE)):
+        lines: list[list[tuple[float, float]]] = []
+        for line in _metric_lines(sheet_dir / filename, crs):
+            lines.extend(clip_line_to_box(line, box))
+        background[key] = lines
+    return background
+
+
+PLAN_ID = re.compile(r"^(plan_terrain|plan_route|plan_layout)(?:_(\d+))?$")
+
+
+def plan_stations(longitudinal: dict[str, Any]) -> list[tuple[float, float, float]]:
+    """종단 측점의 (누가거리 m, x, y) — 계획평면도 장 나눔의 유일한 기준 자료."""
+    stations: list[tuple[float, float, float]] = []
+    for station in longitudinal.get("stations") or []:
+        if not isinstance(station, dict):
+            continue
+        chainage = station.get("chainage_m")
+        x, y = station.get("center_x"), station.get("center_y")
+        if all(isinstance(value, (int, float)) for value in (chainage, x, y)):
+            stations.append((float(chainage), float(x), float(y)))
+    return stations
+
+
+def plan_chunk_for(
+    longitudinal: dict[str, Any], drawing_id: str
+) -> tuple[str, dict[str, Any], int]:
+    """도면 id 에서 (주제, 그 장의 구간, 전체 장수)를 찾는다."""
+    match = PLAN_ID.fullmatch(drawing_id)
+    if not match:
+        raise ValueError("올바르지 않은 계획평면도 ID입니다.")
+    kind = match.group(1)
+    chunks = plan_chunks(plan_stations(longitudinal))
+    number = int(match.group(2)) if match.group(2) else 1
+    chunk = next((item for item in chunks if item["number"] == number), None)
+    if chunk is None:
+        raise FileNotFoundError("요청한 계획평면도 장을 찾을 수 없습니다.")
+    return kind, chunk, len(chunks)
+
+
+def plan_source(context: Any, longitudinal: dict[str, Any], drawing_id: str) -> dict[str, Any]:
+    """계획평면도 한 장의 입력(노선·측점·등고선·세류선·구조물)을 사업지 CRS(m)로 모은다.
+
+    배경은 유역도와 **같은 창구**(`map_background`)를 쓴다 — 도엽 GeoJSON 읽기·좌표
+    환산이 캐시돼 두 도면이 자료를 나눠 쓴다(2026-09-04 사용자 지시).
+
+    장이 여럿이면 그 장의 구간(누가거리)에 드는 노선·구조물만 싣고, 배경도 그 범위로
+    절취한다 — 축척 1/1,200 은 고정이므로 안 들어가면 장을 나눈다.
+    """
+    kind, chunk, total = plan_chunk_for(longitudinal, drawing_id)
+    start_m, end_m = float(chunk["start_m"]), float(chunk["end_m"])
+
+    route_xy: list[tuple[float, float]] = []
+    for vertex in context.vertices:
+        chainage = float(getattr(vertex, "chainage_m", 0.0) or 0.0)
+        if total > 1 and not (start_m <= chainage <= end_m):
+            continue
+        route_xy.append((vertex.x, vertex.y))
+    # 측점 눈금은 **종단 측점**을 쓴다 — 노선 정점은 조밀하고 누가거리가 간격의 배수가 아니다.
+    stations = [
+        station
+        for station in plan_stations(longitudinal)
+        if total <= 1 or start_m <= station[0] <= end_m
+    ]
+
+    structures = [
+        structure
+        for structure in _plan_structures(context)
+        if total <= 1 or start_m <= float(structure.get("chainage_m") or -1.0) <= end_m
+    ]
+    background = map_background(
+        Path(context.project_root),
+        context.crs,
+        DRAWING_SCALE_PLAN,
+        plan_area_mm(),
+        route_xy,
+    )
+    return {
+        "kind": kind,
+        "label": plan_drawing_label(kind, chunk, total),
+        "route_xy": route_xy,
+        "stations": stations,
+        "contours": background["contours"],
+        "streams": background["streams"],
+        "structures": structures,
+    }
+
+
+def _plan_structures(context: Any) -> list[dict[str, Any]]:
+    """배치도에 찍을 구조물 — B04 배수시설 정본(`pipe_points.json`)을 그대로 읽는다.
+
+    좌표는 이미 사업지 CRS(m)다(B04가 그렇게 쓴다). 없으면 빈 목록 — 배치도는 배경과
+    노선만으로도 열린다.
+    """
+    path = Path(context.project_root) / "B04_PreProcess" / "drainage" / "edits" / "pipe_points.json"
+    points = _geojson_payload(path).get("points")
+    if not isinstance(points, list):
+        return []
+    return [point for point in points if isinstance(point, dict)]
+
+
 def watershed_source(context: Any) -> dict[str, Any]:
     """유역도 입력(노선·세부유역·등고선·세류선)을 사업지 CRS(m)로 모은다.
 
     저장본은 전부 WGS84라 여기서 미터 좌표로 되돌린다(B04가 저장할 때와 반대 방향).
 
     되돌리는 좌표계가 둘이다. **배경(도엽 등고선·세류선)은 사업지 좌표계**로 돌린다 —
-    노선(`context.vertices`)이 그 좌표계에 있으므로 같은 자리에 겹쳐야 한다. **세부유역은
-    그 파일을 쓸 때 쓴 좌표계**로 돌린다 — 좌표계 기록 이전 저장본은 노선 CSV의 EPSG
-    라벨로 쓰였고, 그 라벨로 되돌려야 원래 미터 좌표가 나온다(2026-09-01).
+    노선(`context.vertices`)이 그 좌표계에 있으므로 같은 자리에 겹쳐야 한다(그 환산은
+    `map_background()` 안에 있다). **세부유역은 그 파일을 쓸 때 쓴 좌표계**로 돌린다 —
+    좌표계 기록 이전 저장본은 노선 CSV의 EPSG 라벨로 쓰였고, 그 라벨로 되돌려야 원래
+    미터 좌표가 나온다(2026-09-01).
     """
     basins_payload = _geojson_payload(detail_basins_path(context.stored_path))
-    to_metric = Transformer.from_crs("EPSG:4326", context.crs, always_xy=True)
     to_basin_metric = Transformer.from_crs(
         "EPSG:4326", _basins_crs(context, basins_payload), always_xy=True
     )
 
-    def metric(point: tuple[float, float]) -> tuple[float, float]:
-        x, y = to_metric.transform(point[0], point[1])
-        return (float(x), float(y))
-
     def basin_metric(point: tuple[float, float]) -> tuple[float, float]:
         x, y = to_basin_metric.transform(point[0], point[1])
         return (float(x), float(y))
@@ -237,39 +384,14 @@ def watershed_source(context: Any) -> dict[str, Any]:
 
     # 배경(등고선·세류선)은 **여러 도엽을 합쳐 받은 뒤 도곽 크기로 절취**한다
     # (2026-08-30 사용자 지시 — 노선이 도엽 경계에 걸릴 수 있어 주변 도엽까지 받아 둔다).
-    # 도엽 등고선 한 줄은 도엽 끝까지 이어지므로 "걸치면 통째로"는 도면이 A1을 넘긴다
-    # (실측 430x871 mm). 절취 범위 = 도곽 안 지형 영역(정보표·제목 제외)을 축척으로 되돌린 크기.
-    usable_w_mm, usable_h_mm = map_area_mm()
-    half_w_m = usable_w_mm / 2.0 * DRAWING_SCALE_BASIN / 1000.0
-    half_h_m = usable_h_mm / 2.0 * DRAWING_SCALE_BASIN / 1000.0
-    extent = [*route_xy, *(point for basin in basins for point in basin["ring"])]
-    if extent:
-        center_x = (min(x for x, _y in extent) + max(x for x, _y in extent)) / 2.0
-        center_y = (min(y for _x, y in extent) + max(y for _x, y in extent)) / 2.0
-        # 노선·유역이 도곽보다 크면 그쪽을 우선한다 — 배경만 잘리고 주제는 다 보인다.
-        min_x = min(center_x - half_w_m, min(x for x, _y in extent))
-        max_x = max(center_x + half_w_m, max(x for x, _y in extent))
-        min_y = min(center_y - half_h_m, min(y for _x, y in extent))
-        max_y = max(center_y + half_h_m, max(y for _x, y in extent))
-    else:
-        min_x = min_y = -math.inf
-        max_x = max_y = math.inf
-
-    box = (min_x, min_y, max_x, max_y)
-
-    def clip(line: list[tuple[float, float]]) -> list[list[tuple[float, float]]]:
-        return clip_line_to_box(line, box)
-
-    sheet_dir = Path(context.project_root) / "B04_PreProcess" / "processed"
-    background: dict[str, list[list[tuple[float, float]]]] = {}
-    for key, filename in (("contours", CONTOUR_FILE), ("streams", STREAM_FILE)):
-        lines: list[list[tuple[float, float]]] = []
-        for feature in _geojson_features(sheet_dir / filename):
-            for part in _geometry_lines(feature.get("geometry")):
-                converted = [metric(point) for point in part]
-                if len(converted) >= 2:
-                    lines.extend(clip(converted))
-        background[key] = lines
+    # 읽기·환산·절취는 `map_background()` 한 곳에 있고 계획평면도·용지도도 같은 것을 쓴다.
+    background = map_background(
+        Path(context.project_root),
+        context.crs,
+        DRAWING_SCALE_BASIN,
+        map_area_mm(),
+        [*route_xy, *(point for basin in basins for point in basin["ring"])],
+    )
 
     return {
         "route_xy": route_xy,
diff --git a/B07_DesignDetail/B07_DesignDetail_Schema.py b/B07_DesignDetail/B07_DesignDetail_Schema.py
index f88fe71f..1fc0ce6d 100644
--- a/B07_DesignDetail/B07_DesignDetail_Schema.py
+++ b/B07_DesignDetail/B07_DesignDetail_Schema.py
@@ -10,7 +10,7 @@ class DesignDrawingItem(BaseModel):
 
     id: str
     # blank: 아직 내용을 만들지 않은 도면 — 도각만 실어 연다(2026-09-01 사용자 지시).
-    kind: Literal["cover", "longitudinal", "cross", "mass_haul", "watershed", "blank"]
+    kind: Literal["cover", "longitudinal", "cross", "mass_haul", "watershed", "plan", "blank"]
     label: str
     chainage_m: float | None = None
     confirmed: bool = False
@@ -33,7 +33,7 @@ class DesignDrawingResponse(BaseModel):
     route_id: int
     id: str
     # blank: 아직 내용을 만들지 않은 도면 — 도각만 실어 연다(2026-09-01 사용자 지시).
-    kind: Literal["cover", "longitudinal", "cross", "mass_haul", "watershed", "blank"]
+    kind: Literal["cover", "longitudinal", "cross", "mass_haul", "watershed", "plan", "blank"]
     label: str
     drawing: dict[str, Any]
     confirmed: bool = False
diff --git a/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts b/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
index bf045511..9e8ef8ad 100644
--- a/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
+++ b/B07_DesignDetail/B07_DesignDetail_UI_Panels.ts
@@ -8,7 +8,10 @@
 
 import { attachCollapsible } from "@ui/ui_template_collapsible";
 import { currentLanguageIndex, ui_locales } from "@ui/ui_template_locale";
-import type { CrossDesignInfo, DesignDrawingItem } from "./B07_DesignDetail_Api_Fetch";
+import type {
+  CrossDesignInfo,
+  DesignDrawingItem,
+} from "./B07_DesignDetail_Api_Fetch";
 
 function L(key: keyof typeof ui_locales): string {
   return ui_locales[key][currentLanguageIndex];
@@ -24,11 +27,13 @@ export const DRAWING_GROUPS: readonly {
   label: string;
   kind?: DesignDrawingItem["kind"];
   blankId?: string;
+  /** 축척 고정으로 장이 나뉘는 도면 — `plan_route`, `plan_route_2` … 를 한 묶음으로 본다. */
+  idPrefix?: string;
 }[] = [
   { label: "표지", kind: "cover" },
-  { label: "계획평면도(지형)", blankId: "blank_plan_terrain" },
-  { label: "계획평면도(노선배치도)", blankId: "blank_plan_route" },
-  { label: "계획평면도(배치도)", blankId: "blank_plan_layout" },
+  { label: "계획평면도(지형)", idPrefix: "plan_terrain" },
+  { label: "계획평면도(노선배치도)", idPrefix: "plan_route" },
+  { label: "계획평면도(배치도)", idPrefix: "plan_layout" },
   { label: "계획평면도(라이다)", blankId: "blank_plan_lidar" },
   { label: "종단면도", kind: "longitudinal" },
   { label: "표준 횡단면도", blankId: "blank_cross_standard" },
@@ -64,7 +69,10 @@ export function buildDrawingSidePanel(
     return panel;
   }
 
-  const drawingButton = (drawing: DesignDrawingItem, label: string): HTMLButtonElement => {
+  const drawingButton = (
+    drawing: DesignDrawingItem,
+    label: string,
+  ): HTMLButtonElement => {
     const button = document.createElement("button");
     button.type = "button";
     button.className = "b07-drawing-button";
@@ -81,7 +89,13 @@ export function buildDrawingSidePanel(
   for (const group of DRAWING_GROUPS) {
     const items = group.kind
       ? drawings.filter((item) => item.kind === group.kind)
-      : drawings.filter((item) => item.id === group.blankId);
+      : group.idPrefix
+        ? drawings.filter(
+            (item) =>
+              item.id === group.idPrefix ||
+              item.id.startsWith(`${group.idPrefix}_`),
+          )
+        : drawings.filter((item) => item.id === group.blankId);
     // 한 장짜리(와 아직 내용이 없는 도면)는 컨테이너 없이 버튼 하나로 둔다.
     if (items.length <= 1) {
       const [drawing] = items;
@@ -103,7 +117,8 @@ export function buildDrawingSidePanel(
       const button = drawingButton(drawing, group.label);
       // 도각만 있는 도면은 그렇다고 알린다 — 빈 화면을 보고 오류로 오해하지 않게.
       button.dataset.pending = String(drawing.kind === "blank");
-      if (drawing.kind === "blank") button.title = "준비 중 — 도각만 표시합니다";
+      if (drawing.kind === "blank")
+        button.title = "준비 중 — 도각만 표시합니다";
       panel.append(button);
       continue;
     }
@@ -125,7 +140,10 @@ export function buildDrawingSidePanel(
   return panel;
 }
 
-const GROUND_TYPE_LABEL: Record<CrossDesignInfo["ground_type"], keyof typeof ui_locales> = {
+const GROUND_TYPE_LABEL: Record<
+  CrossDesignInfo["ground_type"],
+  keyof typeof ui_locales
+> = {
   soil: "B06_Design_Ground_Soil",
   ripping_rock: "B06_Design_Ground_Ripping",
   blasting_rock: "B06_Design_Ground_Blasting",
@@ -147,7 +165,8 @@ export function isCrossSheet(drawing: DesignDrawingItem): boolean {
 /** 측구 규격 표시 문자열 (design 신구조: 형식별 ditch spec, F-2 호환). */
 function ditchLabel(design: CrossDesignInfo): string {
   const ditch = design.ditch;
-  if (!ditch || ditch.type === "none" || design.ditch_enabled === false) return "없음";
+  if (!ditch || ditch.type === "none" || design.ditch_enabled === false)
+    return "없음";
   if (ditch.type === "l_type")
     return `L형 ${ditch.width_m.toFixed(2)}×${ditch.depth_m.toFixed(2)}m`;
   return `${ditch.top_width_m.toFixed(2)}×${ditch.depth_m.toFixed(2)}m`;
@@ -183,19 +202,23 @@ export function buildDesignInfoPanel(
   const heading = document.createElement("div");
   heading.className = "b07-info__heading";
   const stationName = document.createElement("strong");
-  const scopeLabel = scope === "sheet" ? L("B07_Info_Sheet") : L("B07_Info_Station");
+  const scopeLabel =
+    scope === "sheet" ? L("B07_Info_Sheet") : L("B07_Info_Station");
   stationName.textContent = `${scopeLabel} ${title}`;
   const confirmed = design?.status === "confirmed";
   const badge = document.createElement("span");
   badge.className = `b07-info__badge${confirmed ? " b07-info__badge--confirmed" : ""}`;
-  badge.textContent = confirmed ? L("B07_Info_Confirmed") : L("B07_Info_Provisional");
+  badge.textContent = confirmed
+    ? L("B07_Info_Confirmed")
+    : L("B07_Info_Provisional");
   heading.append(stationName, badge);
   panel.append(heading);
 
   if (!design) {
     const empty = document.createElement("p");
     empty.className = "b07-info__empty";
-    empty.textContent = scope === "sheet" ? L("B07_Info_SheetHint") : L("B07_Info_NoDesign");
+    empty.textContent =
+      scope === "sheet" ? L("B07_Info_SheetHint") : L("B07_Info_NoDesign");
     panel.append(empty);
     return panel;
   }
@@ -210,7 +233,9 @@ export function buildDesignInfoPanel(
     infoRow(L("B07_Info_CutSide"), cutSideLabel(design.section_mode)),
     infoRow(
       L("B07_Info_DitchSide"),
-      design.ditch_side === "left" ? L("B06_Design_Ditch_Left") : L("B06_Design_Ditch_Right"),
+      design.ditch_side === "left"
+        ? L("B06_Design_Ditch_Left")
+        : L("B06_Design_Ditch_Right"),
     ),
   );
 
@@ -220,7 +245,10 @@ export function buildDesignInfoPanel(
   planTitle.textContent = L("B07_Info_Plan_Title");
   plan.append(
     planTitle,
-    infoRow(L("B07_Info_DesignElevation"), `${design.design_elevation_m.toFixed(2)}m`),
+    infoRow(
+      L("B07_Info_DesignElevation"),
+      `${design.design_elevation_m.toFixed(2)}m`,
+    ),
     infoRow(L("B07_Info_CutSlope"), `1:${design.cut_slope_ratio}`),
     infoRow(L("B07_Info_FillSlope"), `1:${design.fill_slope_ratio}`),
     infoRow(L("B07_Info_RoadWidth"), `${design.roadbed_width_m.toFixed(2)}m`),
diff --git a/config/config_system.py b/config/config_system.py
index 50a826ca..de4780e4 100644
--- a/config/config_system.py
+++ b/config/config_system.py
@@ -175,6 +175,9 @@ DRAWING_SCALE_MASSHAUL_H_CANDIDATES = (
 DRAWING_MASSHAUL_USABLE_WIDTH_MM = 700.0
 DRAWING_SCALE_MASSHAUL_V_M3_MM = 50.0  # 유토곡선 세로 — 종이 1 mm 당 토량(㎥)
 DRAWING_SCALE_BASIN = 6000  # 유역도 평면 축척 분모 (실거리 1 m = 1/6 mm)
+# 계획평면도·용지도 평면 축척 분모 — 지식DB 「설계제원_총괄」 측량·도면 기준 1/1,200.
+# 횡단면도와 같은 원칙: 축척은 줄이지 않고, 한 장에 안 들어가면 **장을 나눈다**.
+DRAWING_SCALE_PLAN = 1200
 
 # 시스템 리소스 로그 (루트 log 폴더에 단일 파일, 1개월 보관)
 LOG_BASE_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "log")