diff --git a/backend/prisma/seed-demo.js b/backend/prisma/seed-demo.js
index b82eaad..0b82b76 100644
--- a/backend/prisma/seed-demo.js
+++ b/backend/prisma/seed-demo.js
@@ -74,6 +74,109 @@ async function main() {
         rooms[r.name.replace(DEMO_PREFIX + ' ', '')] = room;
     }
 
+    // ==================== FACILITY STRUCTURE ====================
+    console.log('\n🏗️ Creating Facility Structure...');
+
+    // Create Property
+    let property = await prisma.facilityProperty.findFirst({ where: { name: `${DEMO_PREFIX} 777 Wolfpack Cultivation` } });
+    if (!property) {
+        property = await prisma.facilityProperty.create({
+            data: {
+                name: `${DEMO_PREFIX} 777 Wolfpack Cultivation`,
+                address: '1234 Grow Lane, Grass Valley, CA 95945',
+                licenseNum: 'CCL21-0001234'
+            }
+        });
+        console.log('  ✓ Property: 777 Wolfpack Cultivation');
+    }
+
+    // Create Buildings
+    const buildingsData = [
+        { name: 'Main Cultivation', code: 'GROW1', type: 'CULTIVATION' },
+        { name: 'Processing Facility', code: 'PROC1', type: 'PROCESSING' },
+    ];
+
+    const buildings = {};
+    for (const b of buildingsData) {
+        let building = await prisma.facilityBuilding.findFirst({
+            where: { code: b.code, propertyId: property.id }
+        });
+        if (!building) {
+            building = await prisma.facilityBuilding.create({
+                data: { ...b, propertyId: property.id }
+            });
+            console.log(`  ✓ Building: ${b.name}`);
+        }
+        buildings[b.code] = building;
+    }
+
+    // Create Floors
+    const floorsData = [
+        { buildingCode: 'GROW1', name: 'Ground Floor', number: 1, width: 100, height: 80, ceilingHeight: 12 },
+        { buildingCode: 'GROW1', name: 'Upper Floor', number: 2, width: 100, height: 80, ceilingHeight: 10 },
+        { buildingCode: 'PROC1', name: 'Ground Floor', number: 1, width: 60, height: 40, ceilingHeight: 10 },
+    ];
+
+    const floors = {};
+    for (const f of floorsData) {
+        const buildingId = buildings[f.buildingCode]?.id;
+        if (!buildingId) continue;
+
+        let floor = await prisma.facilityFloor.findFirst({
+            where: { number: f.number, buildingId }
+        });
+        if (!floor) {
+            floor = await prisma.facilityFloor.create({
+                data: {
+                    buildingId,
+                    name: f.name,
+                    number: f.number,
+                    width: f.width,
+                    height: f.height,
+                    ceilingHeight: f.ceilingHeight
+                }
+            });
+            console.log(`  ✓ Floor: ${f.buildingCode} - ${f.name}`);
+        }
+        floors[`${f.buildingCode}-F${f.number}`] = floor;
+    }
+
+    // Create Facility Rooms (mapped to grow rooms)
+    const facilityRoomsData = [
+        { floorKey: 'GROW1-F1', name: 'Veg Room 1', code: 'VEG-A', type: 'VEG', posX: 10, posY: 10, width: 40, height: 30 },
+        { floorKey: 'GROW1-F1', name: 'Veg Room 2', code: 'VEG-B', type: 'VEG', posX: 55, posY: 10, width: 35, height: 25 },
+        { floorKey: 'GROW1-F1', name: 'Mother Room', code: 'MTHR', type: 'MOTHER', posX: 10, posY: 45, width: 20, height: 20 },
+        { floorKey: 'GROW1-F2', name: 'Flower Room A', code: 'FLR-A', type: 'FLOWER', posX: 5, posY: 5, width: 45, height: 35 },
+        { floorKey: 'GROW1-F2', name: 'Flower Room B', code: 'FLR-B', type: 'FLOWER', posX: 52, posY: 5, width: 45, height: 35 },
+        { floorKey: 'GROW1-F2', name: 'Flower Room C', code: 'FLR-C', type: 'FLOWER', posX: 5, posY: 42, width: 40, height: 30 },
+        { floorKey: 'PROC1-F1', name: 'Dry Room', code: 'DRY', type: 'DRY', posX: 5, posY: 5, width: 25, height: 30 },
+        { floorKey: 'PROC1-F1', name: 'Cure Room', code: 'CURE', type: 'CURE', posX: 35, posY: 5, width: 20, height: 30 },
+    ];
+
+    for (const fr of facilityRoomsData) {
+        const floorId = floors[fr.floorKey]?.id;
+        if (!floorId) continue;
+
+        const existing = await prisma.facilityRoom.findFirst({
+            where: { code: fr.code, floorId }
+        });
+        if (!existing) {
+            await prisma.facilityRoom.create({
+                data: {
+                    floorId,
+                    name: fr.name,
+                    code: fr.code,
+                    type: fr.type,
+                    posX: fr.posX,
+                    posY: fr.posY,
+                    width: fr.width,
+                    height: fr.height
+                }
+            });
+        }
+    }
+    console.log('  ✓ 8 facility rooms mapped');
+
     // ==================== BATCHES ====================
     console.log('\n🌱 Creating Batches...');
     const batchesData = [