diff --git a/src/app/(protected)/workorders/_components/list/table/cells/build-site-dialog-patch.ts b/src/app/(protected)/workorders/_components/list/table/cells/build-site-dialog-patch.ts
index fc557598..8cdac978 100644
--- a/src/app/(protected)/workorders/_components/list/table/cells/build-site-dialog-patch.ts
+++ b/src/app/(protected)/workorders/_components/list/table/cells/build-site-dialog-patch.ts
@@ -1,5 +1,6 @@
 import { extractLocationLabel } from "@/app/(protected)/workorders/_components/list/table/cells/site-dialog-helpers";
 import type { SitePatch } from "@/app/(protected)/workorders/_components/list/table/cells/site-dialog-types";
+import { normalizeAdditionalContacts } from "@/domain/work-orders/mappers/additional-contacts-mapper";
 import { resolveSiteCode } from "@/domain/work-orders/mappers/work-order-board-mapper";
 import type { WorkOrderAdditionalContact } from "@/domain/work-orders/types/work-order-additional-contact";
 import type { LocationOption } from "@/domain/work-orders/types/work-order";
@@ -41,7 +42,8 @@ export function buildSiteDialogPatch({
   // Following the site record, the dialog's extra contacts are the site's: copy them only when edited.
   const sendContacts = followsSiteRecord ? contactsDirty : contactsDirty || baselineHadContacts;
   if (sendContacts) {
-    patch.additionalContacts = extraContacts;
+    // The work order keeps only complete name/phone rows; site contact ids stay on the site request.
+    patch.additionalContacts = normalizeAdditionalContacts(extraContacts) ?? [];
   }
   return patch;
 }
diff --git a/src/test/app/(protected)/workorders/build-site-dialog-patch.test.ts b/src/test/app/(protected)/workorders/build-site-dialog-patch.test.ts
new file mode 100644
index 00000000..91f349c4
--- /dev/null
+++ b/src/test/app/(protected)/workorders/build-site-dialog-patch.test.ts
@@ -0,0 +1,57 @@
+import { describe, expect, it } from "vitest";
+import { buildSiteDialogPatch } from "@/app/(protected)/workorders/_components/list/table/cells/build-site-dialog-patch";
+
+const base = {
+  code: "S-100",
+  locId: "1",
+  selected: undefined,
+  pocName: "Jane",
+  pocPhone: "(421) 433-1111",
+  pocNotes: "",
+  contactsDirty: true,
+  baselineHadContacts: true,
+  followsSiteRecord: true,
+};
+
+describe("buildSiteDialogPatch", () => {
+  it("copies site-loaded extra contacts to the work order without their site contact ids", () => {
+    const patch = buildSiteDialogPatch({
+      ...base,
+      extraContacts: [{ name: "Bob", phone: "(421) 433-7777", siteContactId: 32 }],
+    });
+
+    expect(patch.additionalContacts).toEqual([{ name: "Bob", phone: "(421) 433-7777" }]);
+  });
+
+  it("drops half-filled and empty extra contacts from the work-order patch", () => {
+    const patch = buildSiteDialogPatch({
+      ...base,
+      extraContacts: [
+        { name: "Bob", phone: "(421) 433-7777", notes: "Night shift", siteContactId: 32 },
+        { name: "Half", phone: "", siteContactId: 33 },
+        { name: "", phone: "(421) 433-0000" },
+        { name: "", phone: "" },
+      ],
+    });
+
+    expect(patch.additionalContacts).toEqual([
+      { name: "Bob", phone: "(421) 433-7777", notes: "Night shift" },
+    ]);
+  });
+
+  it("still clears the work order's copy when every extra contact was removed", () => {
+    const patch = buildSiteDialogPatch({ ...base, extraContacts: [] });
+
+    expect(patch.additionalContacts).toEqual([]);
+  });
+
+  it("leaves additional contacts off the patch when they were not edited", () => {
+    const patch = buildSiteDialogPatch({
+      ...base,
+      contactsDirty: false,
+      extraContacts: [{ name: "Bob", phone: "(421) 433-7777", siteContactId: 32 }],
+    });
+
+    expect(patch).not.toHaveProperty("additionalContacts");
+  });
+});
diff --git a/src/test/app/(protected)/workorders/site-dialog-site-record.test.tsx b/src/test/app/(protected)/workorders/site-dialog-site-record.test.tsx
index 121e7dbd..c51d8130 100644
--- a/src/test/app/(protected)/workorders/site-dialog-site-record.test.tsx
+++ b/src/test/app/(protected)/workorders/site-dialog-site-record.test.tsx
@@ -195,7 +195,7 @@ describe("Work order Site dialog edits the site record", () => {
         pocName: "Jane",
         pocPhone: "(421) 433-9999",
         pocNotes: "",
-        additionalContacts: [{ name: "Bob", phone: "(421) 433-7777", siteContactId: 32 }],
+        additionalContacts: [{ name: "Bob", phone: "(421) 433-7777" }],
       }),
     );
     expect(onOpenChange).toHaveBeenCalledWith(false);