| C E Electrical (South West) Limited | 2016 | 31 Jan 2027 (in 110 days) |
| C Parker & Son Electrical Contractors Limited | 2025 | 31 Oct 2027 (in 383 days) |
| C W Electrical Solutions Limited | 2015 | 31 Dec 2026 (in 79 days) |
| C W Jones Electrical Services Ltd | 2014 | 31 Dec 2027 (in 444 days) |
| C.A.P Security Limited | 2005 | 30 Nov 2026 (in 48 days) |
| C.A.T. Electrical, Fire and Security Limited | 2003 | 31 Dec 2026 (in 79 days) |
| C.I.W Electrical Services Ltd | 2020 | 30 Sep 2027 (in 352 days) |
| Cable IT (SW) Limited | 2013 | 28 Feb 2027 (in 138 days) |
| Capture Fire and Security Ltd | 2026 | 23 Dec 2027 (in 436 days) |
| Cervus Electrical Ltd | 2021 | 31 Dec 2026 (in 79 days) |
| Chew Valley Electrics Ltd. | 2009 | 28 Feb 2027 (in 138 days) |
| Choice Networks Limited | 2018 | 30 Nov 2026 (in 48 days) |
| Chrome Electrical Limited | 2015 | 31 Dec 2026 (in 79 days) |
| Circle Electrical Ltd | 2018 | 31 Mar 2027 (in 169 days) |
| CJ Electrical Engineering Ltd | 2022 | 31 May 2027 (in 230 days) |
| Cleverspark Ltd | 2019 | 31 May 2027 (in 230 days) |
| Clifton Electrical Services ( South West ) Limited | 2015 | 31 Jan 2027 (in 110 days) |
| CMM Building Services Limited | 2014 | 5 Jan 2027 (in 84 days) |
| Collard Electrical Ltd | 2019 | 31 Dec 2027 (in 444 days) |
| Colvetta Electrical Ltd | 2023 | 31 Oct 2027 (in 383 days) |
| Combined Building and Electrical Services (UK) Limited | 1998 | 31 Mar 2027 (in 169 days) |
| Compass Security Systems Limited | 1987 | 31 Mar 2027 (in 169 days) |
| Complex Electrical Limited | 2023 | 31 Dec 2026 (in 79 days) |
| Connect Electrical Services (SW) Limited | 2024 | 31 Dec 2026 (in 79 days) |
| Consort Services Ltd | 2008 | 31 Dec 2026 (in 79 days) |
| Cook Electrical Services Ltd | 2015 | 31 Dec 2026 (in 79 days) |
| County Installation Services Limited | 2004 | 31 Oct 2026 (in 18 days) |
| CRS Contracting Services Ltd | 2022 | 31 Dec 2026 (in 79 days) |
| Current Installations (Bristol) Limited | 2005 | 28 Feb 2027 (in 138 days) |
| Custom Creative Solutions Limited | 2010 | 30 Apr 2027 (in 199 days) |
| CW Electrical (Bristol) Limited | 2004 | 31 Aug 2027 (in 322 days) |
| D W Electrical (South West) Ltd | 2016 | 31 Dec 2026 (in 79 days) |
| D'ambrosio - Phillips Electrical Contractors Limited | 2022 | 31 Aug 2027 (in 322 days) |
| D.J. Mayhead Electrical Services Limited | 2010 | 30 Sep 2027 (in 352 days) |
| D.T.E. Contractors Ltd | 2013 | 30 Jun 2027 (in 260 days) |
| Daley Electrical Services Limited | 2012 | 30 Sep 2027 (in 352 days) |
| Dannydistro Ltd | 2022 | 31 Jan 2027 (in 110 days) |
| Dantech Fire Services Ltd | 2018 | 31 Jan 2028 (in 475 days) |
| David Fear Electrical Contractors Limited | 1984 | 30 Sep 2027 (in 352 days) |
| David Fear Electrical Limited | 2001 | 30 Sep 2027 (in 352 days) |
| Dawes Services Ltd | 2025 | 6 Jul 2027 (in 266 days) |
| Dazzling Engineering Ltd | 2026 | 30 Sep 2027 (in 352 days) |
| DB Electrical (Bristol) Ltd | 2022 | 31 Jul 2027 (in 291 days) |
| DB Electrical Solutions (UK) Ltd | 2013 | 31 Aug 2027 (in 322 days) |
| DB Networking Ltd | 2020 | 31 Dec 2027 (in 444 days) |
| Dce Contracting Ltd | 2018 | 31 Mar 2027 (in 169 days) |
| Ddhe Services Ltd | 2021 | 31 Dec 2027 (in 444 days) |
| Dean Giles Electrical Limited | 2010 | 31 Dec 2027 (in 444 days) |
| Delta Y Electrical Ltd | 2016 | 31 Jan 2028 (in 475 days) |
| Dew Electrical Contractors Ltd | 2025 | 31 May 2028 (in 596 days) |