| A B A Commissioning Ltd | Electricians | DA14 4DT | 2023 |
| A N Electrical Ltd | Electricians | DA14 4DT | 2003 |
| A Palmer Electrical Ltd | Electricians | DA14 4DT | 2014 |
| Ability Mep Ltd | Electricians | DA14 4DT | 2021 |
| Above Average Electrical Ltd | Electricians | DA14 4BG | 2022 |
| Aceyblocks Productions Ltd | Electricians | DA14 4DT | 2018 |
| Ajrg Electrical Ltd | Electricians | DA14 4DT | 2023 |
| Allum Building Services Ltd | Electricians | DA15 9ES | 2005 |
| Amicusdan Site Services Ltd | Electricians | DA15 9ER | 2008 |
| B M Installations Ltd | Electricians | DA14 4DT | 2008 |
| B White Electrical Ltd | Electricians | DA14 4DT | 2018 |
| Bassett Electrical Group Ltd | Electricians | DA14 4DT | 2026 |
| Bdt Electrical/Environmental Ltd | Electricians | DA14 4DT | 2018 |
| Beautiful Electrical Ltd | Electricians | DA14 6NE | 2019 |
| Bodhi Electrical Ltd | Electricians | DA14 4BH | 2024 |
| Bpm Electrical Ltd | Electricians | DA14 4DT | 2015 |
| Bright Ideas Electrical Services Ltd | Electricians | DA15 8BD | 2024 |
| Buckson Property Maintenance Ltd | Electricians | DA15 9LF | 2026 |
| Bwt Construction South East Ltd | Electricians | DA15 9BL | 2018 |
| C D Quinn Building Services Ltd | Electricians | DA14 4DT | 2019 |
| C Markham Electrical Ltd | Electricians | DA14 6NE | 2016 |
| C Quinn Electrical and Building Services Ltd | Electricians | DA14 4DT | 2015 |
| Carey Electrical Contracts Ltd | Electricians | DA14 4DT | 2013 |
| Cavern Electrical and Mechanical Services Ltd | Electricians | DA14 4DT | 2005 |
| Cc Cousins Ltd | Electricians | DA14 4DT | 2000 |
| Central Fire Solutions Ltd | Electricians | DA14 4DT | 2023 |
| Charles F E Ltd | Electricians | DA14 4DT | 2024 |
| Christchurch Electrical Solutions Ltd | Electricians | DA14 4DT | 2017 |
| Corby Building Maintenance Ltd | Electricians | DA14 4DT | 1996 |
| Cp Technical Ltd | Electricians | DA14 4DT | 2025 |
| Cromwell Electrical Management Ltd | Electricians | DA14 4DT | 2024 |
| Crw Electrical Ltd | Electricians | DA14 6NE | 2011 |
| D J Scoble Complete Services Ltd | Electricians | DA14 4DT | 2017 |
| D J Scoble Electrical Services Ltd | Electricians | DA14 4DT | 2024 |
| D Mace Electrical Ltd | Electricians | DA15 9DR | 2016 |
| Ddp Electrical Ltd | Electricians | DA14 4DT | 2026 |
| Dffb Services Ltd | Electricians | DA14 4DT | 2024 |
| Dja Electrical Ltd | Electricians | DA14 4DT | 2016 |
| Djm Electrical Services Ltd | Electricians | DA14 4DT | 2006 |
| Dkw-Solutions Ltd | Electricians | DA14 6NE | 2026 |
| Doreworks Ltd | Electricians | DA14 6NE | 2023 |
| Double O Electrical Ltd | Electricians | DA14 4DT | 2021 |
| Dunelm Building Services Ltd | Electricians | DA14 6NE | 2009 |
| Elegant Av Ltd | Electricians | DA14 4DT | 2020 |
| Elmstead Electrical Ltd | Electricians | DA14 4DT | 2009 |
| Emeny’S Electrical Ltd | Electricians | DA14 4DT | 2026 |
| Etc Electrical Ltd | Electricians | DA14 4DT | 2006 |
| Exceed Electrical Services Ltd | Electricians | DA14 4DT | 2007 |
| F.W. Harley Ltd | Electricians | DA15 9JJ | 1993 |
| Fairlight Electrical Ltd | Electricians | DA15 7AH | 2017 |
| Fenner Nash Electrical Ltd | Electricians | DA15 7BY | 1994 |
| First Step Services Ltd | Electricians | DA14 4BG | 2020 |
| G.E.S Gymer'S Electrical Service Ltd | Electricians | DA14 4DT | 2015 |
| G.J. Day Electrical Contractors Ltd | Electricians | DA14 6NE | 1998 |
| Goldsystem Ltd | Electricians | DA14 4DT | 1984 |
| Goldsystem Operations Ltd | Electricians | DA14 4DT | 2015 |
| Hrh Electrical Contractors Ltd | Electricians | DA14 4DT | 2024 |
| Huntley Electronic Systems Ltd | Electricians | DA14 4DT | 2012 |
| Ideal Lights Fm Ltd | Electricians | DA14 6NE | 2013 |
| J A Cooper Electrics Ltd | Electricians | DA14 4DT | 2018 |
| J A S Electrical Services Ltd | Electricians | DA15 9DT | 2011 |
| J A Simmonds Electrical Ltd | Electricians | DA15 8BD | 2017 |
| J F Webb Electrical Ltd | Electricians | DA14 4DT | 2012 |
| Jace Group UK Ltd | Electricians | DA14 4DT | 2018 |
| Jap Electrical Ltd | Electricians | DA14 4DT | 2020 |
| Jbw Electrical Services Ltd | Electricians | DA14 4DT | 2024 |
| Jehl Electrics Ltd | Electricians | DA14 4DT | 2019 |
| Jmb Contractors Ltd | Electricians | DA14 4JZ | 2007 |
| Jmr Contracting Services Ltd | Electricians | DA14 4DT | 2018 |
| K R Electrical Installations Ltd | Electricians | DA14 6NE | 2022 |
| Klm Electrical Services Ltd | Electricians | DA15 8BD | 2009 |
| L Tindell Electrical Ltd | Electricians | DA14 4DT | 2024 |
| Lb4 Control System Ltd | Electricians | DA14 4DT | 2023 |
| Libra Construction Services Ltd | Electricians | DA15 7JQ | 1997 |
| Low Cool Refrigeration Ltd | Electricians | DA14 4DT | 2022 |
| M & M Electrical Building Services London Ltd | Electricians | DA14 4DT | 2015 |
| M Hyland Electrical Services Ltd | Electricians | DA14 4DT | 2019 |
| M J B Electrics Ltd | Electricians | DA15 8BG | 2003 |
| M Reynolds Electrical Ltd | Electricians | DA14 4DT | 2018 |
| M Reynolds Electrical Services Ltd | Electricians | DA14 4DT | 2024 |
| Mad Electrical Ltd | Electricians | DA14 6DY | 2026 |
| Martech Electrical Services Ltd | Electricians | DA14 4DT | 2019 |
| Max Milner Electrical Ltd | Electricians | DA14 4DT | 2013 |
| Mburton Electrical Services Ltd | Electricians | DA15 7AA | 2026 |
| Mda Electrical Ltd | Electricians | DA14 4DT | 2015 |
| Merrill Electrical Ltd | Electricians | DA14 4DT | 2018 |
| Mes Contractors Ltd | Electricians | DA14 4DT | 2018 |
| Modern Building Services Ltd | Electricians | DA14 6NE | 2018 |
| Morcombe Electrical Services Ltd | Electricians | DA14 6NE | 2016 |
| Morena'S Electrical and Building Services Ltd | Electricians | DA14 4DT | 2020 |
| Mr Charger Ltd | Electricians | DA14 6NE | 2016 |
| Mre Services Ltd | Electricians | DA14 4BG | 2021 |
| Mtw Technical Services Ltd | Electricians | DA14 4DT | 2018 |
| Multidata and Electrical Ltd | Electricians | DA14 4DT | 2020 |
| Murray Lift Maintenance Ltd | Electricians | DA14 6EN | 2015 |
| Nbr Electrical Ltd | Electricians | DA15 7LJ | 2021 |
| New Leaf Electrical Ltd | Electricians | DA14 6NE | 2019 |
| Northstar 73 Electrical Services Ltd | Electricians | DA14 4BG | 2021 |
| Northstar Electrical Services Ltd | Electricians | DA14 4DT | 2025 |
| O & E Services Ltd | Electricians | DA14 6NE | 2005 |
| Os Electrical Systems Ltd | Electricians | DA15 7LE | 2026 |
| P.R. Kemp Services Ltd | Electricians | DA14 4DT | 2024 |
| Paragon Electrical Installations Ltd | Electricians | DA14 4BG | 2021 |
| Parkfield Controls Ltd | Electricians | DA14 4DT | 2026 |
| Pcb Mechanical & Electrical Contractors Ltd | Electricians | DA14 4DE | 2025 |
| Pfe Direct Ltd | Electricians | DA14 4DT | 2018 |
| Pfe Services Ltd | Electricians | DA14 4DT | 2026 |
| Pinewood Electrical Services Ltd | Electricians | DA14 4DT | 1997 |
| Pjc Contract Services Ltd | Electricians | DA14 4DT | 2019 |
| Platinum E L V Design Ltd | Electricians | DA14 4DT | 2002 |
| Potter Electrical Services Ltd | Electricians | DA15 9DS | 2011 |
| Povey Little Services Ltd | Electricians | DA14 4DT | 2018 |
| Prepen Technical Services Ltd Ltd | Electricians | DA15 8DW | 2018 |
| Prism Electric Ltd | Electricians | DA14 4DT | 2020 |
| R Nunn Electrical Ltd | Electricians | DA14 4DT | 2016 |
| Railec Ltd | Electricians | DA14 4BG | 2021 |
| Raw Electrical Services Ltd | Electricians | DA14 4BG | 2020 |
| Reads Building Services Ltd | Electricians | DA15 8HY | 2003 |
| Rec Technical Services Ltd | Electricians | DA14 4DT | 2020 |
| Reset Electrical Services Ltd | Electricians | DA14 4DT | 2020 |
| Rlc Electrical Ltd | Electricians | DA14 4DT | 2024 |