Home / Installers / London
HA3: plumbing, heating and air-conditioning companies in London
HA3 (London) has 2 plumbing, heating and air-conditioning companies registered here (SIC 43220) and 8 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, HA3 had ≈12 nights above 18 °C in 2026 (8 times the 1991–2020 average of 1.6).
HA3
Open a company
TDCON LTD, incorporated 2019, status Active - Proposal to Strike off.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| TDCON LTD | 2019 | Active - Proposal to Strike off | HA3 |
| ULTIMATE LONDON LTD | 2016 | Active | HA3 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| AOS ELECTRICAL SERVICES LTD | 43210 · electrical installation | 2021 | Active | HA3 |
| ELECTRINNA LTD | 43210 · electrical installation; 42220 | 2018 | Active | HA3 |
| ELECTRINSTALL LTD | 43210 · electrical installation | 2018 | Active - Proposal to Strike off | HA3 |
| EXCLUSIVE AUDIO VISUAL LTD | 43210 · electrical installation; 43290 · other construction installation; 43999; 62020 | 2023 | Active | HA3 |
| G D PAVING LIMITED | 43290 · other construction installation; 41202; 43330 | 2025 | Active | HA3 |
| ODI PROJECT LTD | 43290 · other construction installation; 78109 | 2019 | Active | HA3 |
| POWERWATT SERVICES LTD | 43210 · electrical installation; 43290 · other construction installation | 2022 | Active - Proposal to Strike off | HA3 |
| TRUSTED ELECTRICAL SERVICES LTD | 43210 · electrical installation; 41201; 41202 | 2022 | Active | HA3 |
What homes around HA3 need
In HA3 last summer (2026) there were ≈12 nights that stayed above 18 °C — 8 times the 1991–2020 average of 1.6 (ERA5 reanalysis, grid ≈30 km, lower than street temperatures in cities).
4% of sampled postcodes in HA3 sit in a conservation area (on-record, 1,261 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 HA3, June–August, minimum at or above 18 °C, retrieved 25 Sep 2026. Conservation-area share: sampled postcode points in HA3, snapshot 25 Sep 2026.
Better than a town-wide list: these are the registered offices in HA3, with that district's hot nights and planning rule.