| W H SCOTT & SONS | — | — | — | Open → |
| WACO UK LTD | — | — | — | Open → |
| Waddington Windows & Doors | York | — | — | Open → |
| WAGSTAFF | — | — | — | Open → |
| WAGSTAFF HOMES LTD | — | — | — | Open → |
| WAINMAN | — | — | — | Open → |
| Wakefield Metropolitan District Council | Wakefield | buildingcontrol@wakefield.gov.uk | x | Open → |
| WALDIE | — | — | — | Open → |
| WALKER | — | — | — | Open → |
| WALKER | — | — | — | Open → |
| Walker Graham LLP | York | architecture@walkergraham.co.uk | Tel. 01904 848868 | Open → |
| Wallis Joinery & Building Ltd | York | — | — | Open → |
| WALLWORK | — | — | — | Open → |
| Walsall Metropolitan Borough Council | Walsall, West Midlands | buildingcontrol@walsall.gov.uk | x | Open → |
| Walsh Associates | Worcester | — | — | Open → |
| WALTON | — | — | — | Open → |
| Wandsworth Council | Wandsworth | — | x | Open → |
| WARD | — | — | 01757 248787 | Open → |
| WARD | — | — | — | Open → |
| WARMCO PROPERTIES | — | — | — | Open → |
| Warrington Borough Council | Warrington, Cheshire | building.control@warrington.gov.uk | 01925 444400 | Open → |
| Warrington Fire Brigade | Cheshire | — | 01925 634593 | Open → |
| Warwick District Council | Royal Leamington Spa | planning_bcontrol@warwickdc.gov.uk | 01926 456511 | Open → |
| Warwickshire Fire & Rescue Service | Warwick | — | — | Open → |
| Warwickshire Fire & Rescue Service | Royal Leamington Spa | firesafety@warwickshire.gov.uk | 01926 423231 | Open → |