| CHRISTOPHER JONES | — | — | — | Open → |
| CHRISTY | — | — | — | Open → |
| CHUDLEIGH | — | — | — | Open → |
| cic laura russel | — | — | 02073997403 laura | Open → |
| City & County of Swansea | Swansea | — | 01792 635701 | Open → |
| City of Bradford Council | Hall Ings | buildingcontrol@bradford.gov.uk | x | Open → |
| City of Coventry Council | Coventry | buildingcontrol@coventry.gov.uk | x | Open → |
| City of Durham County Council | Durham | — | 0191 301 8776 | Open → |
| City of Edinburgh Council | Edinburgh | — | 0131 200 2000 | Open → |
| City of Lincoln | Lincoln | — | 01522 881188 | Open → |
| City of London | London | district.surveyor@cityoflondon.gov.uk | 0207 332 1000 | Open → |
| City of Sunderland | Sunderland | — | 0191 553 1543 | Open → |
| City of Westminster District Council | London | districtsurveyors@westminster.gov.uk | x | Open → |
| City of York Council | YORK | building.control@york.gov.uk | x | Open → |
| CK Architectural Services | Hull | — | — | Open → |
| CLAIR & RICHARD BAXTER | — | — | — | Open → |
| CLAIR AND ADAM GARSIDE | — | — | — | Open → |
| CLAIR ANDERSON | — | — | — | Open → |
| Clair Miles Miles | Alwoodley | — | — | Open → |
| Clair Miles Miles | Alwoodley | — | — | Open → |
| Clair Miles Miles | Alwoodley | — | — | Open → |
| CLAIR MORGAN | — | — | — | Open → |
| Claire Bartfield | Leeds | — | — | Open → |
| Claire Docwra | York | — | 01904468210 | Open → |
| Claire Evans | Leeds | — | — | Open → |