diff --git a/M02_MasterTemplete/M02_MasterTemplete_Store.py b/M02_MasterTemplete/M02_MasterTemplete_Store.py
index 4522430b..2d0e0a11 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_Store.py
+++ b/M02_MasterTemplete/M02_MasterTemplete_Store.py
@@ -24,6 +24,10 @@ STRUCTURE_TABLE = "구조물집계표"
 _BASIS_HEAD = (("work", "공종"), ("spec", "규격"), ("detail", "산출 내역"), ("unit", "단위"))
 _NUMBER = re.compile(r"^구-(\d+)$")
 _BAD_NAME = re.compile(r'[\\/:*?"<>|\x00-\x1f]|\.\.')
+# 도각 없는 빈 CAD 문서의 기본 도면층 — 없으면 B07 CAD 가 못 엶("Cannot read properties
+# of undefined (reading 'length')") · CAD 쪽도 없으면 새로 채우지만(2026-09-27 sub1 고침)
+# 뿌리도 처음부터 채움
+_BLANK_LAYER = {"id": "기본", "name": "기본", "isVisible": True, "isLocked": False}
 # ponytail: 저장은 한 번에 하나(프로세스 안 잠금) · 서버를 여럿 띄우면 파일 잠금으로
 _LOCK = threading.Lock()
 
@@ -145,7 +149,7 @@ def create_structure(column: str) -> dict[str, Any]:
             "판": 1,
             "열": column,
             "도번": f"구-{number:02d}",
-            "도면": {"format": 6, "entities": []},
+            "도면": {"format": 6, "entities": [], "layers": [dict(_BLANK_LAYER)]},
             "산출근거": {"양식": "산출근거", "종류": "표", "판": 1, "열": basis, "줄": basis_rows},
         }
         atomic_write_json(path, doc)
diff --git a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
index 86334a25..97e462cc 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_UI_Side.ts
@@ -45,7 +45,13 @@ function stubDoc(kind: Kind, name: string): unknown {
         합계줄: [],
         보기: {},
       }
-    : { format: 6, entities: [] };
+    : {
+        format: 6,
+        entities: [],
+        // 기본 도면층 하나 — 없으면 B07 CAD 가 못 엶("Cannot read properties of
+        // undefined (reading 'length')", 2026-09-27 실측)
+        layers: [{ id: "기본", name: "기본", isVisible: true, isLocked: false }],
+      };
 }
 
 export interface SideOptions {
diff --git a/resources/master_template/structure/be.json b/resources/master_template/structure/be.json
index 66d85d4c..44363508 100644
--- a/resources/master_template/structure/be.json
+++ b/resources/master_template/structure/be.json
@@ -6,7 +6,15 @@
   "도번": "구-25",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/bg.json b/resources/master_template/structure/bg.json
index 80bb0b4b..02de2357 100644
--- a/resources/master_template/structure/bg.json
+++ b/resources/master_template/structure/bg.json
@@ -6,7 +6,15 @@
   "도번": "구-33",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/bm_area.json b/resources/master_template/structure/bm_area.json
index 46cdf626..49a16c8d 100644
--- a/resources/master_template/structure/bm_area.json
+++ b/resources/master_template/structure/bm_area.json
@@ -6,7 +6,15 @@
   "도번": "구-23",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/bm_len.json b/resources/master_template/structure/bm_len.json
index a1cf80d4..984072e0 100644
--- a/resources/master_template/structure/bm_len.json
+++ b/resources/master_template/structure/bm_len.json
@@ -6,7 +6,15 @@
   "도번": "구-22",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/bx_len.json b/resources/master_template/structure/bx_len.json
index f900a3e7..2bf67cdc 100644
--- a/resources/master_template/structure/bx_len.json
+++ b/resources/master_template/structure/bx_len.json
@@ -6,7 +6,15 @@
   "도번": "구-12",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/bx_wing.json b/resources/master_template/structure/bx_wing.json
index 67f21977..4778ca23 100644
--- a/resources/master_template/structure/bx_wing.json
+++ b/resources/master_template/structure/bx_wing.json
@@ -6,7 +6,15 @@
   "도번": "구-13",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/cs.json b/resources/master_template/structure/cs.json
index 30d6273d..db1f0bdc 100644
--- a/resources/master_template/structure/cs.json
+++ b/resources/master_template/structure/cs.json
@@ -6,7 +6,15 @@
   "도번": "구-35",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/ec.json b/resources/master_template/structure/ec.json
index affd8114..6e82c59e 100644
--- a/resources/master_template/structure/ec.json
+++ b/resources/master_template/structure/ec.json
@@ -6,7 +6,15 @@
   "도번": "구-24",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/etc.json b/resources/master_template/structure/etc.json
index fed2e8fa..494b744a 100644
--- a/resources/master_template/structure/etc.json
+++ b/resources/master_template/structure/etc.json
@@ -6,7 +6,15 @@
   "도번": "구-36",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/fb.json b/resources/master_template/structure/fb.json
index 080bd463..5a451088 100644
--- a/resources/master_template/structure/fb.json
+++ b/resources/master_template/structure/fb.json
@@ -6,7 +6,15 @@
   "도번": "구-14",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/fp_l.json b/resources/master_template/structure/fp_l.json
index 764a2ae2..4f63b5f3 100644
--- a/resources/master_template/structure/fp_l.json
+++ b/resources/master_template/structure/fp_l.json
@@ -6,7 +6,15 @@
   "도번": "구-16",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/fp_w.json b/resources/master_template/structure/fp_w.json
index f8ff8360..273a0c0d 100644
--- a/resources/master_template/structure/fp_w.json
+++ b/resources/master_template/structure/fp_w.json
@@ -6,7 +6,15 @@
   "도번": "구-15",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/gr_curb.json b/resources/master_template/structure/gr_curb.json
index 360487e7..37644022 100644
--- a/resources/master_template/structure/gr_curb.json
+++ b/resources/master_template/structure/gr_curb.json
@@ -6,7 +6,15 @@
   "도번": "구-30",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/gr_rail.json b/resources/master_template/structure/gr_rail.json
index 066402f1..294467dc 100644
--- a/resources/master_template/structure/gr_rail.json
+++ b/resources/master_template/structure/gr_rail.json
@@ -6,7 +6,15 @@
   "도번": "구-29",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/gr_sign.json b/resources/master_template/structure/gr_sign.json
index b47412c5..12293769 100644
--- a/resources/master_template/structure/gr_sign.json
+++ b/resources/master_template/structure/gr_sign.json
@@ -6,7 +6,15 @@
   "도번": "구-31",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_break.json b/resources/master_template/structure/h_break.json
index 981857b3..ad2c7de4 100644
--- a/resources/master_template/structure/h_break.json
+++ b/resources/master_template/structure/h_break.json
@@ -6,7 +6,15 @@
   "도번": "구-47",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_ford_basin.json b/resources/master_template/structure/h_ford_basin.json
index 4be43476..716555bb 100644
--- a/resources/master_template/structure/h_ford_basin.json
+++ b/resources/master_template/structure/h_ford_basin.json
@@ -6,7 +6,15 @@
   "도번": "구-45",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_intake.json b/resources/master_template/structure/h_intake.json
index 13c5fb13..7f4611fe 100644
--- a/resources/master_template/structure/h_intake.json
+++ b/resources/master_template/structure/h_intake.json
@@ -6,7 +6,15 @@
   "도번": "구-37",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_pg_rail.json b/resources/master_template/structure/h_pg_rail.json
index 93a629e0..0cef504a 100644
--- a/resources/master_template/structure/h_pg_rail.json
+++ b/resources/master_template/structure/h_pg_rail.json
@@ -6,7 +6,15 @@
   "도번": "구-43",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_pv_rail.json b/resources/master_template/structure/h_pv_rail.json
index 44f3fac4..d482add1 100644
--- a/resources/master_template/structure/h_pv_rail.json
+++ b/resources/master_template/structure/h_pv_rail.json
@@ -6,7 +6,15 @@
   "도번": "구-42",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_rip_c.json b/resources/master_template/structure/h_rip_c.json
index 2b3268d3..358e9d6b 100644
--- a/resources/master_template/structure/h_rip_c.json
+++ b/resources/master_template/structure/h_rip_c.json
@@ -6,7 +6,15 @@
   "도번": "구-38",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_rip_m.json b/resources/master_template/structure/h_rip_m.json
index 12564857..12a8d42d 100644
--- a/resources/master_template/structure/h_rip_m.json
+++ b/resources/master_template/structure/h_rip_m.json
@@ -6,7 +6,15 @@
   "도번": "구-39",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_rockfall.json b/resources/master_template/structure/h_rockfall.json
index 25195f35..4f9ab417 100644
--- a/resources/master_template/structure/h_rockfall.json
+++ b/resources/master_template/structure/h_rockfall.json
@@ -6,7 +6,15 @@
   "도번": "구-46",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_soil_ditch.json b/resources/master_template/structure/h_soil_ditch.json
index d05202cc..3736eff0 100644
--- a/resources/master_template/structure/h_soil_ditch.json
+++ b/resources/master_template/structure/h_soil_ditch.json
@@ -6,7 +6,15 @@
   "도번": "구-44",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_stone_bed.json b/resources/master_template/structure/h_stone_bed.json
index f90baf98..552ad655 100644
--- a/resources/master_template/structure/h_stone_bed.json
+++ b/resources/master_template/structure/h_stone_bed.json
@@ -6,7 +6,15 @@
   "도번": "구-41",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_stone_ch.json b/resources/master_template/structure/h_stone_ch.json
index 3c6e4922..3c8681a0 100644
--- a/resources/master_template/structure/h_stone_ch.json
+++ b/resources/master_template/structure/h_stone_ch.json
@@ -6,7 +6,15 @@
   "도번": "구-40",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/h_waste.json b/resources/master_template/structure/h_waste.json
index 82add70b..232ad307 100644
--- a/resources/master_template/structure/h_waste.json
+++ b/resources/master_template/structure/h_waste.json
@@ -6,7 +6,15 @@
   "도번": "구-48",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/memo.json b/resources/master_template/structure/memo.json
index 489e5ef8..294196d7 100644
--- a/resources/master_template/structure/memo.json
+++ b/resources/master_template/structure/memo.json
@@ -6,7 +6,15 @@
   "도번": "구-49",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/mr.json b/resources/master_template/structure/mr.json
index 53369635..50c5616b 100644
--- a/resources/master_template/structure/mr.json
+++ b/resources/master_template/structure/mr.json
@@ -6,7 +6,15 @@
   "도번": "구-32",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/ms.json b/resources/master_template/structure/ms.json
index f0272a10..daf621cc 100644
--- a/resources/master_template/structure/ms.json
+++ b/resources/master_template/structure/ms.json
@@ -6,7 +6,15 @@
   "도번": "구-20",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/no.json b/resources/master_template/structure/no.json
index aa348227..b8f5736e 100644
--- a/resources/master_template/structure/no.json
+++ b/resources/master_template/structure/no.json
@@ -6,7 +6,15 @@
   "도번": "구-01",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/od_cnt.json b/resources/master_template/structure/od_cnt.json
index 2d01ffab..2e8b1c25 100644
--- a/resources/master_template/structure/od_cnt.json
+++ b/resources/master_template/structure/od_cnt.json
@@ -6,7 +6,15 @@
   "도번": "구-18",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/od_len.json b/resources/master_template/structure/od_len.json
index 52ae094a..55d47902 100644
--- a/resources/master_template/structure/od_len.json
+++ b/resources/master_template/structure/od_len.json
@@ -6,7 +6,15 @@
   "도번": "구-17",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pg_in.json b/resources/master_template/structure/pg_in.json
index 7293a81e..c8db3f47 100644
--- a/resources/master_template/structure/pg_in.json
+++ b/resources/master_template/structure/pg_in.json
@@ -6,7 +6,15 @@
   "도번": "구-11",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pp_cp.json b/resources/master_template/structure/pp_cp.json
index 0bb30dfe..7dc39795 100644
--- a/resources/master_template/structure/pp_cp.json
+++ b/resources/master_template/structure/pp_cp.json
@@ -6,7 +6,15 @@
   "도번": "구-10",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pp_len.json b/resources/master_template/structure/pp_len.json
index c55eb833..63833fb9 100644
--- a/resources/master_template/structure/pp_len.json
+++ b/resources/master_template/structure/pp_len.json
@@ -6,7 +6,15 @@
   "도번": "구-09",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/ps.json b/resources/master_template/structure/ps.json
index ceaafad7..6ae5bf4d 100644
--- a/resources/master_template/structure/ps.json
+++ b/resources/master_template/structure/ps.json
@@ -6,7 +6,15 @@
   "도번": "구-34",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pv_a.json b/resources/master_template/structure/pv_a.json
index edb9aed1..6d688784 100644
--- a/resources/master_template/structure/pv_a.json
+++ b/resources/master_template/structure/pv_a.json
@@ -6,7 +6,15 @@
   "도번": "구-07",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pv_b.json b/resources/master_template/structure/pv_b.json
index 04938563..379a96bb 100644
--- a/resources/master_template/structure/pv_b.json
+++ b/resources/master_template/structure/pv_b.json
@@ -6,7 +6,15 @@
   "도번": "구-04",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pv_jt.json b/resources/master_template/structure/pv_jt.json
index ee6a8e75..012c5a81 100644
--- a/resources/master_template/structure/pv_jt.json
+++ b/resources/master_template/structure/pv_jt.json
@@ -6,7 +6,15 @@
   "도번": "구-08",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pv_l.json b/resources/master_template/structure/pv_l.json
index 91980abd..f9505e6e 100644
--- a/resources/master_template/structure/pv_l.json
+++ b/resources/master_template/structure/pv_l.json
@@ -6,7 +6,15 @@
   "도번": "구-05",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/pv_w.json b/resources/master_template/structure/pv_w.json
index 91a9fa8c..d54e44cd 100644
--- a/resources/master_template/structure/pv_w.json
+++ b/resources/master_template/structure/pv_w.json
@@ -6,7 +6,15 @@
   "도번": "구-06",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/rf.json b/resources/master_template/structure/rf.json
index 50cf9500..150a7647 100644
--- a/resources/master_template/structure/rf.json
+++ b/resources/master_template/structure/rf.json
@@ -6,7 +6,15 @@
   "도번": "구-26",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/rv.json b/resources/master_template/structure/rv.json
index 34378219..6dbfba2e 100644
--- a/resources/master_template/structure/rv.json
+++ b/resources/master_template/structure/rv.json
@@ -6,7 +6,15 @@
   "도번": "구-03",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/rw.json b/resources/master_template/structure/rw.json
index be6470b2..d71048f5 100644
--- a/resources/master_template/structure/rw.json
+++ b/resources/master_template/structure/rw.json
@@ -6,7 +6,15 @@
   "도번": "구-19",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/sg.json b/resources/master_template/structure/sg.json
index 1fa04f0c..3a34aee6 100644
--- a/resources/master_template/structure/sg.json
+++ b/resources/master_template/structure/sg.json
@@ -6,7 +6,15 @@
   "도번": "구-21",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/sta.json b/resources/master_template/structure/sta.json
index 855f03db..d456334b 100644
--- a/resources/master_template/structure/sta.json
+++ b/resources/master_template/structure/sta.json
@@ -6,7 +6,15 @@
   "도번": "구-02",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/ta.json b/resources/master_template/structure/ta.json
index 577c44a8..6d5fb9bb 100644
--- a/resources/master_template/structure/ta.json
+++ b/resources/master_template/structure/ta.json
@@ -6,7 +6,15 @@
   "도번": "구-28",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/master_template/structure/wy.json b/resources/master_template/structure/wy.json
index 1b33e090..f360037b 100644
--- a/resources/master_template/structure/wy.json
+++ b/resources/master_template/structure/wy.json
@@ -6,7 +6,15 @@
   "도번": "구-27",
   "도면": {
     "format": 6,
-    "entities": []
+    "entities": [],
+    "layers": [
+      {
+        "id": "기본",
+        "name": "기본",
+        "isVisible": true,
+        "isLocked": false
+      }
+    ]
   },
   "산출근거": {
     "양식": "산출근거",
diff --git a/resources/tester/test_m02_structure.py b/resources/tester/test_m02_structure.py
index 9876b26b..b5c03ea9 100644
--- a/resources/tester/test_m02_structure.py
+++ b/resources/tester/test_m02_structure.py
@@ -34,8 +34,10 @@ def test_새로_도번_자동_409_없는_열(client):
         "pp_len",
         "구-01",
     )
-    # 도각 없는 전용 화면 — 그린 만큼이 설계 영역
-    assert doc["도면"] == {"format": 6, "entities": []}
+    # 도각 없는 전용 화면 — 그린 만큼이 설계 영역 · 기본 도면층 하나(없으면 CAD 가 못 엶)
+    assert doc["도면"]["format"] == 6
+    assert doc["도면"]["entities"] == []
+    assert len(doc["도면"]["layers"]) == 1
     basis = doc["산출근거"]
     assert [c["머리"][0] for c in basis["열"]] == ["공종", "규격", "산출 내역", "단위", "수량(m당)"]
     # 빈 줄 몇 개를 미리 둠 — 줄 더하기 안 눌러도 바로 입력