diff --git a/B04_PreProcess/B04_PreProcess_UI_Page.ts b/B04_PreProcess/B04_PreProcess_UI_Page.ts
index 342d484e..300c8495 100644
--- a/B04_PreProcess/B04_PreProcess_UI_Page.ts
+++ b/B04_PreProcess/B04_PreProcess_UI_Page.ts
@@ -200,6 +200,13 @@ export async function renderB04Surface(root: HTMLElement): Promise<void> {
     try {
       await buildSheetSurface(projectId, method);
       models = (await listSurfaceModels(projectId)).models;
+      // 만들었으니 「미생성」 표시를 걷는다 — 버튼 줄을 통째로 다시 세우지는 않는다
+      // (현재 선택·스무딩 상태가 날아간다).
+      const button = sheetMethodButtons.get(method);
+      if (button) {
+        button.classList.remove("is-unbuilt");
+        button.removeAttribute("title");
+      }
       showToast(
         L("B04_Surface_Build_Done").replace("{filter}", label).replace("{method}", "도엽등고"),
         "success",