| WILSON | — | — | — | Open → |
| WILTSHIRE | — | — | — | Open → |
| Wiltshire Council | Chippenham | buildingcontrolwest@wiltshire.gov.uk | 01249 706111 | Open → |
| Wiltshire Fire & Rescue Service | Wiltshire | — | 01380 723601-3 | Open → |
| Wiltshire Fire Brigade | Devizes, Wilts. | — | 01380 723601/2/3 | Open → |
| Winchester City Council | Winchester | — | — | Open → |
| Window Options | Howden | — | — | Open → |
| Window Options (Yorkshire) Ltd | Goole | — | — | Open → |
| Window Options (Yorkshire) Ltd | Goole | — | — | Open → |
| WINFIELD | — | — | — | Open → |
| Winston Burns | York | — | — | Open → |
| Wioleta Krzywicka | York | — | — | Open → |
| Wirral Metropolitan Borough Council | Wirral, Merseyside | buildingcontrol@wirral.gov.uk | 0151 6477000 | Open → |
| WISE OWL DAY NURSARY | — | — | — | Open → |
| WISE OWL DAY NURSARY | — | — | — | Open → |
| WODHOUSE (LUND) LTD | — | — | — | Open → |
| Woking Borough Council | Woking | buildingcontrol@woking.gov.uk | — | Open → |
| Wokingham Borough Council | Wokingham | building.control@wokingham.gov.uk | 0118 974 6239 | Open → |
| WOLD ENGINEERING SERVICES | — | — | — | Open → |
| Wolverhampton Borough Council | Wolverhampton | — | 01902 556556 | Open → |
| WOOD | — | — | — | Open → |
| WOODHOUSE (LUND) LTD | — | — | — | Open → |
| Woodhouse (Lund) Ltd | Driffield | — | — | Open → |
| Woodhouse Lund Ltd | Driffield | — | — | Open → |
| WOODLAND PROPERTIES WOODLAND LODGE | — | — | — | Open → |