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N21: plumbing, heating and air-conditioning companies in London
N21 (London) has 45 plumbing, heating and air-conditioning companies registered here (SIC 43220) and 41 electrical and other installation companies (Companies House, 1 Sep 2026); 0 are MCS-certified for air-to-air yet. If the summer is the question, N21 had ≈11 nights above 18 °C in 2026 (7 times the 1991–2020 average of 1.6).
N21
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ACHILLES HEATING LTD, incorporated 2022, status Active.
Plumbing, heating and air-conditioning companies
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| A2Z ELECTRIC LTD | 43210 · electrical installation | 2019 | Active | N21 |
| ACTUS CONSTRUCTION LIMITED | 43290 · other construction installation | 2020 | Active | N21 |
| ACY ELECTRICAL SERVICES LTD | 43210 · electrical installation | 2018 | Active | N21 |
| APEX UK CONSTRUCTION LIMITED | 43290 · other construction installation; 41100 | 2022 | Active - Proposal to Strike off | N21 |
| ARENA ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2005 | Active | N21 |
| ARENA FIRE AND SECURITY LONDON LTD | 43210 · electrical installation | 2019 | Active | N21 |
| BARBICAN CONNECT LTD | 43210 · electrical installation; 41100 | 2021 | Active | N21 |
| BEDMAL CONSTRUCT LIMITED | 43210 · electrical installation; 41202; 81300 | 2025 | Active | N21 |
| BUILD WITH CONFIDENCE CONSTRUCTION LTD | 43290 · other construction installation | 2017 | Active | N21 |
| BUILD WITH CONFIDENCE GROUP LIMITED | 43290 · other construction installation | 2017 | Active | N21 |
| COSMAR ELECTRICAL CONTRACTORS LIMITED | 43210 · electrical installation | 2003 | Active | N21 |
| D AIREY ELECTRICAL LIMITED | 43210 · electrical installation | 2016 | Active | N21 |
| DPG ELECTRICAL SOLUTIONS LTD | 43210 · electrical installation | 2021 | Active | N21 |
| EMERGENCY SPARKZ LTD | 43210 · electrical installation | 2026 | Active | N21 |
| EXMOUTH LTD | 43290 · other construction installation; 43390 | 2012 | Active | N21 |
| FUS3 ELECTRICAL LTD | 43210 · electrical installation | 2016 | Active | N21 |
| G E R CONSTRUCTION LTD | 43290 · other construction installation | 2012 | Active | N21 |
| G.KRAS1 LTD | 43210 · electrical installation | 2014 | Active | N21 |
| GREEN SCOPE PROPERTY SOLUTIONS LTD | 43210 · electrical installation; 81100 | 2025 | Active | N21 |
| H&M ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2020 | Active | N21 |
| INN CONTACT LTD | 43210 · electrical installation; 46900 | 2024 | Active | N21 |
| JDS ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2023 | Active | N21 |
| K W CARPENTRY SERVICES LIMITED | 43290 · other construction installation | 2003 | Active | N21 |
| LOKI 75 LIMITED | 43290 · other construction installation | 2021 | Active | N21 |
| MARLIN KITCHENS LTD | 43290 · other construction installation | 2023 | Active | N21 |
| MICHAEL MCGARVEY LIMITED | 43290 · other construction installation | 2017 | Active | N21 |
| MOON PVC LTD | 43290 · other construction installation; 47910; 47990; 70229 | 2020 | Active | N21 |
| MTT ELECTRICAL SOLUTIONS LIMITED | 43210 · electrical installation | 2024 | Active | N21 |
| NAVILLUS CONSTRUCTION LIMITED | 43290 · other construction installation | 2013 | Active | N21 |
| NOVA-92 HMD CONSTRUCTION LTD | 43290 · other construction installation | 2025 | Active | N21 |
| ON ELECTRICAL & FIRE ALARM LTD | 43210 · electrical installation | 2018 | Active | N21 |
| P.HYSENAJ CONSTRUCTION LTD | 43290 · other construction installation; 41202; 43341 | 2023 | Active | N21 |
| PARK VIEW KITCHENS LTD | 43290 · other construction installation; 43320; 43999 | 2024 | Active | N21 |
| SELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2002 | Active | N21 |
| SOLUX CARPENTRY LTD | 43290 · other construction installation; 41201; 41202 | 2024 | Active | N21 |
| THE DATA INFRASTRUCTURE GROUP LTD | 43210 · electrical installation | 2023 | Active | N21 |
| TRIANGLE BUILDING SERVICES LTD | 43290 · other construction installation; 43310; 43341; 43390 | 2012 | Active | N21 |
| W&S SOLUTIONS LTD | 43210 · electrical installation | 2023 | Active | N21 |
| W.H.W. REFURBISHMENTS LIMITED | 43290 · other construction installation | 2003 | Active | N21 |
| WHITTEN LTD | 43210 · electrical installation | 2021 | Active | N21 |
| ZENGO ELECTRICS LIMITED | 43210 · electrical installation | 2022 | Active | N21 |
What homes around N21 need
In N21 last summer (2026) there were ≈11 nights that stayed above 18 °C — 7 times the 1991–2020 average of 1.6 (ERA5 reanalysis, grid ≈30 km, lower than street temperatures in cities).
13% of sampled postcodes in N21 sit in a conservation area (on-record, 557 live postcodes).
In England an air-source heat pump on a house can be permitted development under Class G when the conditions hold, including the MCS 020a noise limit of 37.0 dB(A) (§3.2 Step 8).
Companies House snapshot 1 Sep 2026, retrieved 25 Sep 2026. The address shown is the registered office, not a verified operating base. This catalogue is a directory of incorporated businesses, not an exhaustive installer register. Hot nights: ERA5-ARCO for N21, June–August, minimum at or above 18 °C, retrieved 25 Sep 2026. Conservation-area share: sampled postcode points in N21, snapshot 25 Sep 2026.
Better than a town-wide list: these are the registered offices in N21, with that district's hot nights and planning rule.