diff --git a/landing-zone-configurator/app/apps/api/src/app.ts b/landing-zone-configurator/app/apps/api/src/app.ts
index 5001657..a70af9f 100644
--- a/landing-zone-configurator/app/apps/api/src/app.ts
+++ b/landing-zone-configurator/app/apps/api/src/app.ts
@@ -270,11 +270,16 @@ export function buildApp(
   if (options.webRoot) {
     // Explicit SPA routes only: API/auth errors and missing assets must remain errors.
     for (const path of [
+      "/workspaces",
       "/templates",
       "/repositories",
       "/configurations",
       "/credentials",
       "/deployments",
+      "/deployments/preparation",
+      "/deployments/plan",
+      "/deployments/apply",
+      "/deployments/history",
       "/organisation",
       "/applications",
       "/configurations/edit",
diff --git a/landing-zone-configurator/app/tests/api.test.ts b/landing-zone-configurator/app/tests/api.test.ts
index 567341b..5889a0c 100644
--- a/landing-zone-configurator/app/tests/api.test.ts
+++ b/landing-zone-configurator/app/tests/api.test.ts
@@ -48,6 +48,15 @@ it("serves the compiled UI without bypassing API authentication", async () => {
       "/repositories",
       "/configurations",
       "/configurations/edit/review",
+      "/deployments",
+      "/deployments/preparation",
+      "/deployments/plan",
+      "/deployments/apply",
+      "/deployments/history",
+      "/workspaces",
+      "/applications",
+      "/credentials",
+      "/organisation",
     ]) {
       const response = await app.inject(path);
       expect(response.statusCode).toBe(200);
@@ -57,6 +66,9 @@ it("serves the compiled UI without bypassing API authentication", async () => {
     expect((await app.inject("/api/v1/unknown")).statusCode).toBe(404);
     expect((await app.inject("/assets/missing.js")).statusCode).toBe(404);
     expect((await app.inject("/templates/unknown")).statusCode).toBe(404);
+    expect((await app.inject("/deployments/unknown")).statusCode).toBe(404);
+    expect((await app.inject("/deployments/apply/extra")).statusCode).toBe(404);
+    expect((await app.inject("/workspaces/unknown")).statusCode).toBe(404);
     expect((await app.inject("/api/v1/unknown")).statusCode).not.toBe(200);
   } finally {
     await app.close();
diff --git a/landing-zone-configurator/docs/development.md b/landing-zone-configurator/docs/development.md
index 8fe0ece..898d5a0 100644
--- a/landing-zone-configurator/docs/development.md
+++ b/landing-zone-configurator/docs/development.md
@@ -35,6 +35,13 @@ it cannot detach a focused input. Actual identity/workspace changes still reset
 the draft and scoped catalogue provider; never retain private catalogues across
 those boundaries.
 
+Keep frontend navigation and the API's explicit SPA route allowlist aligned,
+including workspace and deployment-phase URLs. Direct loads and reloads must
+serve the compiled UI through the API, not just the development server's history
+fallback. The static-serving API regression covers these paths while retaining
+404 responses for unknown routes, API/auth paths and missing assets; do not
+replace the allowlist with a catch-all.
+
 ## Validation versus cloud operations
 
 | Workflow | Trigger and purpose |