diff --git a/app/(tabs)/_layout.tsx b/app/(tabs)/_layout.tsx
index 9ffb2a0..3c818bf 100644
--- a/app/(tabs)/_layout.tsx
+++ b/app/(tabs)/_layout.tsx
@@ -12,6 +12,8 @@ import ListMateriel from './gestionnaire_ressource';
 import Home from './home';
 import MapScreen from './mapScreen';
 
+import AntDesign from '@expo/vector-icons/AntDesign';
+
 const Tabs = createBottomTabNavigator();
 
 export default function TabLayout() {
@@ -61,8 +63,17 @@ export default function TabLayout() {
           tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
         }}
       >
-
       </Tabs.Screen>
+      <Tabs.Screen
+        name="ajouterChantier"
+        component={ListMateriel}
+        options={{
+          title: 'Ajouter',
+          tabBarIcon: ({ color }) => (
+            <AntDesign name="plus" size={24} color="black" />
+          ),
+        }}
+      />              
       
     </Tabs.Navigator>
   );
diff --git a/services/ressourcesService.ts b/services/ressourcesService.ts
index fdf4c7a..8b8dd3c 100644
--- a/services/ressourcesService.ts
+++ b/services/ressourcesService.ts
@@ -1,4 +1,4 @@
-import { collection, getDoc, getDocs, Timestamp } from "firebase/firestore";
+import { collection, doc, getDoc, getDocs, Timestamp, updateDoc } from "firebase/firestore";
 import { Chantier, Reservation, Ressources, User } from "../class/class";
 import { db } from "../firebase_config";
 
@@ -80,3 +80,13 @@ function convertReservation(res: any): Reservation {
       res.dateFin instanceof Timestamp ? res.dateFin.toDate() : new Date(res.dateFin),
   };
 }
+
+export async function changeChantierStatus(chantierId: string, newStatus: string): Promise<void> {
+  try {
+    const chantierRef = doc(db, "chantier", chantierId);
+    await updateDoc(chantierRef, { status: newStatus });
+    console.log(`Chantier ${chantierId} status updated to ${newStatus}`);
+  } catch (err) {
+    console.error("Error", err);
+  }
+}
\ No newline at end of file