| LIZA ON | — | — | — | Open → |
| LLEWELLYN | — | — | — | Open → |
| LLOYD DOWSON & CO | — | — | — | Open → |
| LLOYDE DOWSON | — | — | — | Open → |
| LLOYDE DOWSON AND CO | — | — | — | Open → |
| LMA Services | York | — | — | Open → |
| LMA SERVICES | — | — | — | Open → |
| Loft Conversion Specialist of Beverley | Beverley | — | : 01482 864155 | Open → |
| Loftcon Ltd | Beverley | — | — | Open → |
| Lofthouse Building Contractors | Newton upon Derwent | — | — | Open → |
| Lofthouse Building Contractors | York | — | — | Open → |
| Lofthouse Building Contractors | York | — | — | Open → |
| LOGAN | — | — | — | Open → |
| Logic Architecture Ltd | Middlesbrough | — | — | Open → |
| LONDESBOROUGH CRICKET CLUB C/O PETER MILNE | — | — | — | Open → |
| London Borough of Barking & Dagenham | BARKING | — | 0208 2273928 | Open → |
| London Borough of Barking & Dagenham | Essex | — | 0208 2273928 | Open → |
| London Borough of Barking &Dagenham | Essex | — | 0208 2273928 | Open → |
| London Borough of Barnet | London | building.control@barnet.gov.uk | x | Open → |
| London Borough of Bexley | Sidcup, Kent | — | 0208 308 4801 | Open → |
| London Borough of Brent | Wembley | planandbuild@brent.gov.uk | x | Open → |
| London Borough of Bromley | Bromley, Kent | buildingcontrol@bromley.gov.uk | 0208 313 4315 | Open → |
| London Borough of Camden | London | building.control@camden.gov.uk | 020 7974 6941 | Open → |
| London Borough of Croydon | Croydon | building.control@croydon.gov.uk | 0208 7605558 | Open → |
| London Borough of Ealing | Ealing | bcontrol@ealing.gov.uk | x | Open → |