diff --git a/app/[workspace]/project/[projectId]/overview/page.tsx b/app/[workspace]/project/[projectId]/overview/page.tsx
index 28da1fc..599b641 100644
--- a/app/[workspace]/project/[projectId]/overview/page.tsx
+++ b/app/[workspace]/project/[projectId]/overview/page.tsx
@@ -124,6 +124,7 @@ export default function ProjectOverviewPage() {
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [refreshing, setRefreshing] = useState(false);
+  const [provisioning, setProvisioning] = useState(false);
 
   const fetchProject = async () => {
     try {
@@ -153,6 +154,24 @@ export default function ProjectOverviewPage() {
     fetchProject();
   };
 
+  const handleProvisionWorkspace = async () => {
+    setProvisioning(true);
+    try {
+      const res = await fetch(`/api/projects/${projectId}/workspace`, { method: 'POST' });
+      const data = await res.json();
+      if (res.ok && data.workspaceUrl) {
+        toast.success('Workspace provisioned — starting up…');
+        await fetchProject();
+      } else {
+        toast.error(data.error || 'Failed to provision workspace');
+      }
+    } catch {
+      toast.error('An error occurred');
+    } finally {
+      setProvisioning(false);
+    }
+  };
+
   if (loading) {
     return (
       <div className="flex items-center justify-center py-32">
@@ -200,16 +219,21 @@ export default function ProjectOverviewPage() {
             <RefreshCw className={`h-4 w-4 mr-1.5 ${refreshing ? "animate-spin" : ""}`} />
             Refresh
           </Button>
-          <Button size="sm" asChild>
-            <a
-              href={project.theiaWorkspaceUrl ?? 'https://theia.vibnai.com'}
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              <Terminal className="h-4 w-4 mr-1.5" />
-              Open IDE
-            </a>
-          </Button>
+          {project.theiaWorkspaceUrl ? (
+            <Button size="sm" asChild>
+              <a href={project.theiaWorkspaceUrl} target="_blank" rel="noopener noreferrer">
+                <Terminal className="h-4 w-4 mr-1.5" />
+                Open IDE
+              </a>
+            </Button>
+          ) : (
+            <Button size="sm" onClick={handleProvisionWorkspace} disabled={provisioning}>
+              {provisioning
+                ? <><Loader2 className="h-4 w-4 mr-1.5 animate-spin" />Provisioning…</>
+                : <><Terminal className="h-4 w-4 mr-1.5" />Provision IDE</>
+              }
+            </Button>
+          )}
         </div>
       </div>
 
diff --git a/app/api/projects/[projectId]/workspace/route.ts b/app/api/projects/[projectId]/workspace/route.ts
new file mode 100644
index 0000000..bf1b006
--- /dev/null
+++ b/app/api/projects/[projectId]/workspace/route.ts
@@ -0,0 +1,71 @@
+import { NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth/authOptions';
+import { query } from '@/lib/db-postgres';
+import { provisionTheiaWorkspace } from '@/lib/cloud-run-workspace';
+
+export async function POST(
+  _request: Request,
+  { params }: { params: Promise<{ projectId: string }> },
+) {
+  try {
+    const { projectId } = await params;
+
+    const session = await getServerSession(authOptions);
+    if (!session?.user?.email) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+    }
+
+    // Verify ownership
+    const rows = await query<{ id: string; data: any }>(`
+      SELECT p.id, p.data
+        FROM fs_projects p
+        JOIN fs_users u ON u.id = p.user_id
+       WHERE p.id = $1 AND u.data->>'email' = $2
+       LIMIT 1
+    `, [projectId, session.user.email]);
+
+    if (rows.length === 0) {
+      return NextResponse.json({ error: 'Project not found' }, { status: 404 });
+    }
+
+    const project = rows[0].data;
+
+    if (project.theiaWorkspaceUrl) {
+      return NextResponse.json({
+        success: true,
+        workspaceUrl: project.theiaWorkspaceUrl,
+        message: 'Workspace already provisioned',
+      });
+    }
+
+    const slug = project.slug;
+    if (!slug) {
+      return NextResponse.json({ error: 'Project has no slug — cannot provision workspace' }, { status: 400 });
+    }
+
+    // Provision Cloud Run workspace
+    const workspace = await provisionTheiaWorkspace(slug, projectId, project.giteaRepo ?? null);
+
+    // Save URL back to project record
+    await query(`
+      UPDATE fs_projects
+         SET data = data || jsonb_build_object(
+               'theiaWorkspaceUrl', $1::text,
+               'theiaAppUuid',      $2::text
+             )
+       WHERE id = $3
+    `, [workspace.serviceUrl, workspace.serviceName, projectId]);
+
+    return NextResponse.json({
+      success: true,
+      workspaceUrl: workspace.serviceUrl,
+    });
+  } catch (error) {
+    console.error('[POST /api/projects/:id/workspace] Error:', error);
+    return NextResponse.json(
+      { error: 'Failed to provision workspace', details: error instanceof Error ? error.message : String(error) },
+      { status: 500 },
+    );
+  }
+}