| CB SOLUTIONS | — | — | — | Open → |
| CBC Interiors | Leeds | — | — | Open → |
| CEDAR PROPERTY DEVELOPMENTS | — | — | — | Open → |
| Central Bedfordshire Council | Shefford | building.control@centralbedfordshire.gov.uk | 0300 300 8635 | Open → |
| Ceredigion County Council | Ceredigion | — | 01970 633481 | Open → |
| CHAMBERLAIN | — | — | — | Open → |
| Chameleon Conservatory Solutions Ltd | Wakefield | — | Andy: 07949868591 | Open → |
| CHANDLER | — | — | — | Open → |
| CHANDLER | — | — | — | Open → |
| CHAPLIN | — | — | — | Open → |
| CHAPMAN | — | — | — | Open → |
| CHARLES BEAUMONT & SON | — | — | — | Open → |
| Charles Harper | Leeds | — | — | Open → |
| Charles Newstead | Leeds | — | — | Open → |
| Charles Pacey | Hovingham | charlespacey@aol.com | — | Open → |
| CHARLES R ROOK | — | — | — | Open → |
| Charlie Ayrton Building Contractor | York | — | — | Open → |
| charlie ayrton york builder | york | — | 07949056331 | Open → |
| CHARLIE IN YORK | — | — | 07949056331 | Open → |
| Charlie Machin/Teresa Machin | York | — | — | Open → |
| Charlotte Burrow | Leeds | — | — | Open → |
| Charlotte Mann | Leeds | — | — | Open → |
| CHARLOTTE MELLOR | — | — | — | Open → |
| Charnwood Borough Council | Loughborough, Leicestershire | building.control@charnwood.gov.uk | x | Open → |
| Chelmsford City Council | Chelmsford, Essex | building.control@chelmsford.gov.uk | 01245 606826 | Open → |