diff --git a/packages/twenty-server/src/database/typeorm/core/migrations/common/1734355945585-add-unique-index-on-subdomain.ts b/packages/twenty-server/src/database/typeorm/core/migrations/common/1734355945585-add-unique-index-on-subdomain.ts
new file mode 100644
index 000000000000..c44b731fe1c0
--- /dev/null
+++ b/packages/twenty-server/src/database/typeorm/core/migrations/common/1734355945585-add-unique-index-on-subdomain.ts
@@ -0,0 +1,19 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddUniqueIndexOnSubdomain1734355945585
+  implements MigrationInterface
+{
+  name = 'AddUniqueIndexOnSubdomain1734355945585';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "core"."workspace" ADD CONSTRAINT "UQ_cba6255a24deb1fff07dd7351b8" UNIQUE ("subdomain")`,
+    );
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "core"."workspace" DROP CONSTRAINT "UQ_cba6255a24deb1fff07dd7351b8"`,
+    );
+  }
+}
diff --git a/packages/twenty-server/src/engine/core-modules/workspace/workspace.entity.ts b/packages/twenty-server/src/engine/core-modules/workspace/workspace.entity.ts
index b80ecad5ecce..5f8e89af34c1 100644
--- a/packages/twenty-server/src/engine/core-modules/workspace/workspace.entity.ts
+++ b/packages/twenty-server/src/engine/core-modules/workspace/workspace.entity.ts
@@ -144,7 +144,7 @@ export class Workspace {
   databaseSchema: string;
 
   @Field()
-  @Column()
+  @Column({ unique: true })
   subdomain: string;
 
   @Field()