diff --git a/src/app/api/super-admin/OfficeFoldersController.ts b/src/app/api/super-admin/OfficeFoldersController.ts
index a5427559..36062499 100644
--- a/src/app/api/super-admin/OfficeFoldersController.ts
+++ b/src/app/api/super-admin/OfficeFoldersController.ts
@@ -47,7 +47,14 @@ export default class OfficeFoldersController extends ApiController {
 			//init OfficeFolder resource with request body values
 			const officeFolderRessource = OfficeFolder.hydrate<OfficeFolder>(req.body);
 			await officeFolderRessource.validateOrReject?.({ groups: ["createFolder"] , forbidUnknownValues: false });
-			//validate folder
+
+			const officeFolderNumberExist = await this.officeFoldersService.get({where: {folder_number: officeFolderRessource.folder_number}});
+
+			if (officeFolderNumberExist) {
+				this.httpValidationError(response, "Folder number already taken");
+				return;
+			}
+
 			//call service to get prisma entity
 			const officeFolderEntity = await this.officeFoldersService.create(officeFolderRessource);
 			//Hydrate ressource with prisma entity
diff --git a/src/common/system/controller-pattern/BaseController.ts b/src/common/system/controller-pattern/BaseController.ts
index 27eb5aa9..edd1af03 100644
--- a/src/common/system/controller-pattern/BaseController.ts
+++ b/src/common/system/controller-pattern/BaseController.ts
@@ -20,6 +20,10 @@ export default abstract class BaseController {
 		return this.httpResponse(response, HttpCodes.BAD_REQUEST, responseData);
 	}
 
+	protected httpValidationError(response: Response, responseData: IResponseData = "Http Validation Error") {
+		return this.httpResponse(response, HttpCodes.VALIDATION_ERROR, responseData);
+	}
+
 	protected httpNotFoundRequest(response: Response, responseData: IResponseData = "Not Found") {
 		return this.httpResponse(response, HttpCodes.NOT_FOUND, responseData);
 	}
diff --git a/src/common/system/controller-pattern/HttpCodes.ts b/src/common/system/controller-pattern/HttpCodes.ts
index 8ca2500b..f6ce001a 100644
--- a/src/common/system/controller-pattern/HttpCodes.ts
+++ b/src/common/system/controller-pattern/HttpCodes.ts
@@ -2,6 +2,7 @@ enum HttpCodes {
 	SUCCESS = 200,
 	CREATED = 201,
 	BAD_REQUEST = 400,
+	VALIDATION_ERROR = 422,
 	INTERNAL_ERROR = 500,
 	UNKNOWN_ERROR = 520,
 	NOT_IMPLEMENTED = 501,