| New Diamond Electronics | 020 8422 6017 | | 13 Ludlow Close, Harrow, HA2 8SR |  Map & Directions |
| Wymer Electrical Ltd | 020 8422 1438 | | Mansard House Unit 11, Brember Road, Harrow, HA2 8AX | | Map & Directions |
| Safeway Electrics | 07860 555028 | | 7 Clitheroe Avenue, Harrow, HA2 9UU | | Map & Directions |
| J P Baldry Electrical | 01895 637498 | | 21 Rosebury Vale, Ruislip, HA4 6AQ | | Map & Directions |
| Power Reserves Ltd | 020 8954 2023 | | 16 College Hill Road , Harrow, HA3 7HE | | Map & Directions |
| C H C Systems Ltd | 01895 678639 | | 2 Princess Lane, Ruislip, HA4 8LG | | Map & Directions |
| L & S Electrical | 01895 471950 | | 79 Mount Park Road, Pinner, HA5 2JS | | Map & Directions |
| Holroyd Electrical | 020 8868 4636 | | 30 Beaulieu Drive, Pinner, HA5 1NG | | Map & Directions |
| Globe Electrical Contractors Ltd | 020 8908 5400 | | 97 The Avenue, Wembley, HA9 9PQ | | Map & Directions |
| Dave's Electrical | 020 8427 2200 | | 33 Elmgrove Road, Harrow, HA1 2QD | | Map & Directions |
| D B Electrical Services Ltd | 020 8866 8277 | | 383a Rayners Lane, Pinner, HA5 5EN | | Map & Directions |
| The Power Service | 020 8381 3997 | | 12 Crowshott Avenue, Stanmore, HA7 1JB | | Map & Directions |
| Greenwald & Gregory | 01923 820986 | | 116 Hallowell Road, Northwood, HA6 1DU | | Map & Directions |
| J B Electrical Contractors Ltd | 01923 840629 | | 44 Knoll Crescent, Northwood, HA6 1HJ | | Map & Directions |
| Light Power Installations Ltd | 01895 625688 | | 123 High Street, Ruislip, HA4 8JN | | Map & Directions |
| S & M Electrical Ltd | 020 8424 2639 | | 6 Vernon Court, Stanmore, HA7 2BN | | Map & Directions |
| Electrical & Fire Alarm Contractors | 020 8845 1115 | | 17 Hardy Avenue, Ruislip, HA4 6SU | | Map & Directions |
| Rotary Southern Ltd | 01895 674264 | | Rotary House, Breakspear Road, Ruislip, HA4 7ST | | Map & Directions |
| Trilectric Ltd | 020 8866 1611 | | 262-270 Field End Road, Eastcote, Ruislip, HA4 9NB | | Map & Directions |
| Impact Electrical Services | 01895 634416 | | 41 Arlington Drive, Ruislip, HA4 7RJ | | Map & Directions |
| Powell Electrical Services | 020 8422 9874 | | 690 Field End Road, Ruislip, HA4 0QR | | Map & Directions |
| Capital Installations | 020 8951 1092 | | 15 Gyles Park, Stanmore, HA7 1AN | | Map & Directions |
| Baker Hart Ltd | 020 8909 0250 | | First Base, Unit 1 Forward Drive, Central Depot, Harrow, HA3 8LT | | Map & Directions |
| J B Electrical Installations Ltd | 020 8868 1529 | | 22 St. Ursula Grove, Pinner, HA5 1LN | | Map & Directions |
| B T Electrics | 020 8954 3747 | | 56 Drummond Drive , Stanmore, HA7 3PD | | Map & Directions |
| Worster & Hounslow Electrical & Security Contractors | 020 8866 4182 | | 56 Potter Street, Pinner, HA5 3XE | | Map & Directions |
| Lucky Electrical Co | 020 8903 0374 | | 608 High Road, Wembley, HA0 2AF | | Map & Directions |
| Mictell Hillpress | 020 8905 0008 | | Victoria House, 18 Dalston Gardens, Stanmore, HA7 1BU | | Map & Directions |
| Rotary Southern Ltd | 01895 674264 | | Rotary House, Breakspear Road, Ruislip, HA4 7ST | | Map & Directions |
| J P S Building Services Ltd | 07946 477468 | | 42 Woodville Gardens , Ruislip, HA4 7ND | | Map & Directions |
| B E C Electrical | 020 8868 0777 | | 46 Lowlands Road , Pinner, HA5 1TU | | Map & Directions |
| G J Electrical | 020 8866 2422 | | 170 Field End Road , Pinner, HA5 1RH | | Map & Directions |
| E H G E | 020 8839 2640 | | 58 Station Approach, South Ruislip, Ruislip, HA4 6SA | | Map & Directions |
| Master Group Ltd | 020 8420 2158 | | York House, Grimsdyke Road, Pinner, HA5 4PH | | Map & Directions |
| Hamer Electrical Contractors Ltd | 020 8427 6766 | | 1 Walton Drive, Harrow, HA1 4XB | | Map & Directions |
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