diff --git a/B05_Profile/B05_Profile_UI_Profile_Structures.ts b/B05_Profile/B05_Profile_UI_Profile_Structures.ts
index eef902955..a9d6ca393 100644
--- a/B05_Profile/B05_Profile_UI_Profile_Structures.ts
+++ b/B05_Profile/B05_Profile_UI_Profile_Structures.ts
@@ -17,7 +17,7 @@ import {
 } from "./B05_Profile_UI_IrregularStations";
 import { structureAnchorM, type StructureInstance } from "./B05_Profile_Api_Structures";
 import { GROUP_LABELS } from "./B05_Profile_UI_Structures_Panel";
-import { HIDDEN_PICK_GROUPS } from "./B05_Profile_UI_Structures_Panel_Types";
+import { isPickHidden } from "./B05_Profile_UI_Structures_Panel_Types";
 
 /** 우클릭 메뉴용 최소 타입 정보 — 사이드 「구조물 배치」 종류 목록과 같은 원천. */
 export interface StructureMenuType {
@@ -33,12 +33,11 @@ export function structureGroupMenuItems(
   types: ReadonlyArray<StructureMenuType>,
   onPick: (typeId: string) => void,
 ): MapContextMenuItem[] {
-  const groups = [...new Set(types.map((type) => type.group))].filter(
-    (group) => !HIDDEN_PICK_GROUPS.has(group),
-  );
+  const pickable = types.filter((type) => !isPickHidden(type));
+  const groups = [...new Set(pickable.map((type) => type.group))];
   return groups.map((group) => ({
     label: GROUP_LABELS[group] ?? group,
-    children: types
+    children: pickable
       .filter((type) => type.group === group)
       .map((type): [string, () => void] => [type.name, () => onPick(type.type_id)]),
   }));
diff --git a/B05_Profile/B05_Profile_UI_Structures_Panel.ts b/B05_Profile/B05_Profile_UI_Structures_Panel.ts
index aec944f83..2e2f95114 100644
--- a/B05_Profile/B05_Profile_UI_Structures_Panel.ts
+++ b/B05_Profile/B05_Profile_UI_Structures_Panel.ts
@@ -56,7 +56,7 @@ import {
   DEFAULT_INTERVAL_LENGTH_M,
   groupOptions,
   hasComputedRange,
-  pickOption,
+  typeOptions,
   readBeforeOption,
   readLengthOption,
   type PipeFacilityItem,
@@ -347,10 +347,7 @@ export function createStructuresSection(
   function syncTypeOptions(keepTypeId?: string): void {
     const group = groupSelect.value;
     const candidates = group ? types.filter((t) => t.group === group && pickable(t)) : [];
-    typeSelect.replaceChildren(
-      new Option("— 선택 —", ""),
-      ...candidates.map((type) => pickOption(type.name, type.type_id, !canPick(type))),
-    );
+    typeSelect.replaceChildren(new Option("— 선택 —", ""), ...typeOptions(candidates, canPick));
     typeSelect.value =
       keepTypeId && candidates.some((type) => type.type_id === keepTypeId) ? keepTypeId : "";
     syncPlacementFields();
diff --git a/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts b/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts
index e667ce5ae..fec141a06 100644
--- a/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts
+++ b/B05_Profile/B05_Profile_UI_Structures_Panel_Types.ts
@@ -38,6 +38,18 @@ export const GROUP_LABELS: Record<string, string> = {
  *  옛 값 · 도면 · 집계는 그대로이고 데이터도 지우지 않는다. */
 export const HIDDEN_PICK_GROUPS: ReadonlySet<string> = new Set(["B", "D"]);
 
+/** 고르기 목록에서 뺄 종류 — 사면안정은 흙막이 · 옹벽 · 소단만(54-31). 옛 값은 그대로. */
+export const HIDDEN_PICK_TYPES: ReadonlySet<string> = new Set([
+  "masonry_wet",
+  "masonry_dry",
+  "boulder_masonry",
+]);
+
+/** 새로 놓을 때 고르기 목록에서 가릴 종류인가 — 뺄 군이거나 뺄 종류. */
+export function isPickHidden(type: { group: string; type_id: string }): boolean {
+  return HIDDEN_PICK_GROUPS.has(type.group) || HIDDEN_PICK_TYPES.has(type.type_id);
+}
+
 /** 고르기 목록 항목 — 가릴 항목은 가림(옛 항목을 열 때는 값으로 그대로 고를 수 있음). */
 export function pickOption(text: string, value: string, hidden: boolean): HTMLOptionElement {
   const option = new Option(text, value);
@@ -56,11 +68,19 @@ export function groupOptions(
     pickOption(
       name ?? GROUP_LABELS[g] ?? g,
       g,
-      HIDDEN_PICK_GROUPS.has(g) || !types.some((t) => t.group === g && pick(t)),
+      !types.some((t) => t.group === g && pick(t) && !isPickHidden(t)),
     ),
   );
 }
 
+/** 종류 드롭다운 항목들 — 고를 수 없거나 뺄 종류는 가림. */
+export function typeOptions(
+  types: StructureType[],
+  pick: (type: StructureType) => boolean,
+): HTMLOptionElement[] {
+  return types.map((t) => pickOption(t.name, t.type_id, !pick(t) || isPickHidden(t)));
+}
+
 /** 구간형 신규 추가 시 기본 구간 길이(m). 사용자가 종점을 바로 고칠 수 있게 짧게 잡는다. */
 export const DEFAULT_INTERVAL_LENGTH_M = 15;