diff --git a/src/app/(protected)/workorders/[id].tsx b/src/app/(protected)/workorders/[id].tsx
index e30574da..48f0fff0 100644
--- a/src/app/(protected)/workorders/[id].tsx
+++ b/src/app/(protected)/workorders/[id].tsx
@@ -25,7 +25,7 @@ export default function WorkOrderViewPage() {
   const navigate = useNavigate();
   const workOrderId = id ?? "";
   const controller = useWorkOrderViewController(workOrderId);
-  const { wo, isLoading, error, refetch, vendorEditor } = controller;
+  const { wo, isLoading, isClosabilityReady, error, refetch, vendorEditor } = controller;
 
   if (isLoading && !wo) {
     return <DetailPageSkeleton variant="view" />;
@@ -48,7 +48,10 @@ export default function WorkOrderViewPage() {
 
   const handleStatusChange = (status: WorkOrderStatus) => {
     const isCompletionStatus = isCompletionStatusLabel(status);
-    if (isCompletionStatus && getClosabilityGaps(detailToClosabilityInput(wo)).length > 0) {
+    if (
+      isCompletionStatus &&
+      (!isClosabilityReady || getClosabilityGaps(detailToClosabilityInput(wo)).length > 0)
+    ) {
       return;
     }
     controller.statusMutation.mutate(status);
@@ -58,6 +61,7 @@ export default function WorkOrderViewPage() {
     <Box className="flex flex-col gap-4 p-4">
       <WorkOrderHeaderSection
         wo={wo}
+        isClosabilityReady={isClosabilityReady}
         statusAnchor={controller.statusAnchor}
         onStatusAnchorChange={controller.setStatusAnchor}
         onStatusChange={handleStatusChange}
diff --git a/src/app/(protected)/workorders/_components/view/work-order-header-section.tsx b/src/app/(protected)/workorders/_components/view/work-order-header-section.tsx
index 7fda2c33..c33f05e5 100644
--- a/src/app/(protected)/workorders/_components/view/work-order-header-section.tsx
+++ b/src/app/(protected)/workorders/_components/view/work-order-header-section.tsx
@@ -23,8 +23,12 @@ const STATUS_COLORS: Record<
   Cancelled: "default",
 };
 
+const CLOSABILITY_UNAVAILABLE_TITLE = "Unable to verify completion requirements";
+
 interface WorkOrderHeaderSectionProps {
   wo: WorkOrderDetail;
+  /** False while board detail is pending/errored — fail closed for Done. */
+  isClosabilityReady: boolean;
   statusAnchor: HTMLElement | null;
   onStatusAnchorChange: (anchor: HTMLElement | null) => void;
   onStatusChange: (status: WorkOrderStatus) => void;
@@ -35,6 +39,7 @@ interface WorkOrderHeaderSectionProps {
 
 export function WorkOrderHeaderSection({
   wo,
+  isClosabilityReady,
   statusAnchor,
   onStatusAnchorChange,
   onStatusChange,
@@ -83,15 +88,17 @@ export function WorkOrderHeaderSection({
           >
             {WORK_ORDER_STATUS_OPTIONS.map((status) => {
               const isCompletionStatus = isCompletionStatusLabel(status);
-              const isCompletedBlocked = isCompletionStatus && closabilityGaps.length > 0;
+              const isCompletedBlocked =
+                isCompletionStatus && (!isClosabilityReady || closabilityGaps.length > 0);
+              const blockedTitle = !isClosabilityReady
+                ? CLOSABILITY_UNAVAILABLE_TITLE
+                : formatClosabilityMissingTitle(closabilityGaps);
               return (
                 <MenuItem
                   key={status}
                   selected={status === wo.status}
                   disabled={isCompletedBlocked}
-                  title={
-                    isCompletedBlocked ? formatClosabilityMissingTitle(closabilityGaps) : undefined
-                  }
+                  title={isCompletedBlocked ? blockedTitle : undefined}
                   onClick={() => {
                     if (isCompletedBlocked) {
                       return;
diff --git a/src/app/(protected)/workorders/_hooks/use-work-order-view-controller.ts b/src/app/(protected)/workorders/_hooks/use-work-order-view-controller.ts
index 3a5578f1..64dd5280 100644
--- a/src/app/(protected)/workorders/_hooks/use-work-order-view-controller.ts
+++ b/src/app/(protected)/workorders/_hooks/use-work-order-view-controller.ts
@@ -16,7 +16,10 @@ export type WorkOrderActivityTab = "customer" | "internal" | "audit";
 
 export function useWorkOrderViewController(workOrderId: string) {
   const { data: detail, isLoading, error, refetch } = useWorkOrderDetail(workOrderId);
-  const { data: boardDetail } = useWorkOrderBoardDetail(workOrderId);
+  const { data: boardDetail, isSuccess: isBoardDetailSuccess } =
+    useWorkOrderBoardDetail(workOrderId);
+  /** Fail closed until board detail succeeds — legacy GetById lacks type/doc/media. */
+  const isClosabilityReady = isBoardDetailSuccess && boardDetail != null;
   const { data: users = [] } = useWorkOrderUsers();
   const statusMutation = useChangeWorkOrderStatus(workOrderId);
   const assignmentMutation = useChangeWorkOrderAssignment(workOrderId);
@@ -63,6 +66,7 @@ export function useWorkOrderViewController(workOrderId: string) {
   return {
     wo,
     isLoading,
+    isClosabilityReady,
     error,
     refetch,
     users,
diff --git a/src/test/app/(protected)/workorders/work-order-header-closability.test.tsx b/src/test/app/(protected)/workorders/work-order-header-closability.test.tsx
index a9b3677a..c979adc0 100644
--- a/src/test/app/(protected)/workorders/work-order-header-closability.test.tsx
+++ b/src/test/app/(protected)/workorders/work-order-header-closability.test.tsx
@@ -2,6 +2,7 @@ import { fireEvent, render, screen } from "@testing-library/react";
 import { MemoryRouter } from "react-router";
 import { describe, expect, it, vi } from "vitest";
 import { WorkOrderHeaderSection } from "@/app/(protected)/workorders/_components/view/work-order-header-section";
+import type { WorkOrderStatus } from "@/domain/work-orders/types/work-order";
 import type { WorkOrderDetail } from "@/domain/work-orders/types/work-order-detail";
 
 const incompleteDetail = {
@@ -36,23 +37,55 @@ const incompleteDetail = {
   dispatches: [],
 } as WorkOrderDetail;
 
+/** Base gates satisfied, type still empty (unenriched) — race window without board detail. */
+const unenrichedButOtherwiseClosable = {
+  ...incompleteDetail,
+  assignedTo: "Alice",
+  workOrderNumber: "20260623001",
+  problem: "HVAC",
+  completedDate: "2026-07-15",
+  type: "",
+  docStatus: "",
+  mediaCount: 0,
+  dispatches: [{ vendorName: "Acme HVAC" }],
+} as WorkOrderDetail;
+
+function renderHeader(props: {
+  wo: WorkOrderDetail;
+  isClosabilityReady: boolean;
+  statusAnchor: HTMLElement | null;
+  onStatusAnchorChange: (anchor: HTMLElement | null) => void;
+  onStatusChange: (status: WorkOrderStatus) => void;
+}) {
+  return (
+    <MemoryRouter>
+      <WorkOrderHeaderSection
+        wo={props.wo}
+        isClosabilityReady={props.isClosabilityReady}
+        statusAnchor={props.statusAnchor}
+        onStatusAnchorChange={props.onStatusAnchorChange}
+        onStatusChange={props.onStatusChange}
+        onDispatch={vi.fn()}
+        onEdit={vi.fn()}
+        onBack={vi.fn()}
+      />
+    </MemoryRouter>
+  );
+}
+
 describe("WorkOrderHeaderSection closability gate", () => {
   it("does not submit Done when closability gaps remain", () => {
     const onStatusChange = vi.fn();
     const onStatusAnchorChange = vi.fn();
 
     const { rerender } = render(
-      <MemoryRouter>
-        <WorkOrderHeaderSection
-          wo={incompleteDetail}
-          statusAnchor={null}
-          onStatusAnchorChange={onStatusAnchorChange}
-          onStatusChange={onStatusChange}
-          onDispatch={vi.fn()}
-          onEdit={vi.fn()}
-          onBack={vi.fn()}
-        />
-      </MemoryRouter>,
+      renderHeader({
+        wo: incompleteDetail,
+        isClosabilityReady: true,
+        statusAnchor: null,
+        onStatusAnchorChange,
+        onStatusChange,
+      }),
     );
 
     fireEvent.click(screen.getByText("Open"));
@@ -60,17 +93,13 @@ describe("WorkOrderHeaderSection closability gate", () => {
     expect(anchor).toBeTruthy();
 
     rerender(
-      <MemoryRouter>
-        <WorkOrderHeaderSection
-          wo={incompleteDetail}
-          statusAnchor={anchor}
-          onStatusAnchorChange={onStatusAnchorChange}
-          onStatusChange={onStatusChange}
-          onDispatch={vi.fn()}
-          onEdit={vi.fn()}
-          onBack={vi.fn()}
-        />
-      </MemoryRouter>,
+      renderHeader({
+        wo: incompleteDetail,
+        isClosabilityReady: true,
+        statusAnchor: anchor,
+        onStatusAnchorChange,
+        onStatusChange,
+      }),
     );
 
     const done = screen.getByRole("menuitem", { name: /^Done$/i });
@@ -78,4 +107,39 @@ describe("WorkOrderHeaderSection closability gate", () => {
     fireEvent.click(done);
     expect(onStatusChange).not.toHaveBeenCalledWith("Done");
   });
+
+  it("does not submit Done while board closability is not ready", () => {
+    const onStatusChange = vi.fn();
+    const onStatusAnchorChange = vi.fn();
+
+    const { rerender } = render(
+      renderHeader({
+        wo: unenrichedButOtherwiseClosable,
+        isClosabilityReady: false,
+        statusAnchor: null,
+        onStatusAnchorChange,
+        onStatusChange,
+      }),
+    );
+
+    fireEvent.click(screen.getByText("Open"));
+    const anchor = onStatusAnchorChange.mock.calls[0]?.[0] as HTMLElement;
+    expect(anchor).toBeTruthy();
+
+    rerender(
+      renderHeader({
+        wo: unenrichedButOtherwiseClosable,
+        isClosabilityReady: false,
+        statusAnchor: anchor,
+        onStatusAnchorChange,
+        onStatusChange,
+      }),
+    );
+
+    const done = screen.getByRole("menuitem", { name: /^Done$/i });
+    expect(done.getAttribute("aria-disabled")).toBe("true");
+    expect(done).toHaveAttribute("title", "Unable to verify completion requirements");
+    fireEvent.click(done);
+    expect(onStatusChange).not.toHaveBeenCalledWith("Done");
+  });
 });