Middx: plumbing, heating and air-conditioning companies
Middx has 2 plumbing, heating and air-conditioning companies (SIC 43220) and 4 electrical and other installation companies registered here (Companies House, 1 Sep 2026); 0 are MCS-certified for air-to-air yet. If the office is in HA5, summer 2026 had ≈10 nights above 18 °C there (7 times the 1991–2020 average of 1.5).
SIC 43220
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GEM HEATING LIMITED, incorporated 2006, status Active.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| GEM HEATING LIMITED | 2006 | Active | UB6 |
| JOHN GIBBONS LIMITED | 2007 | Active - Proposal to Strike off | HA5 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| ALVI SERVICES LIMITED | 43290 · other construction installation; 41202; 43999; 77320 | 2022 | Active | HA1 |
| SDL SECURITY LTD | 43210 · electrical installation; 80300 | 2005 | Active | HA5 |
| SERVICES ON SITE LTD | 43210 · electrical installation; 41100; 46900; 47910 | 2006 | Active | HA5 |
| P S DECOR LTD | 43290 · other construction installation | 2010 | Active | HA3 |
Heat and planning around Middx
In Middx last summer (2026) there were ≈11.5 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). The figure is the household-weighted mean of 4 postcode districts where these offices are registered.
7% of sampled postcodes in Middx sit in a conservation area (4,167 live postcodes across 4 districts).
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, June–August, minimum at or above 18 °C, household-weighted across the districts where these offices are registered, retrieved 25 Sep 2026. Conservation-area share: sampled postcode points, snapshot 25 Sep 2026. Distances are an equirectangular approximation to 0.1 km.
Better than a town directory that only lists names: each plumbing company links to its Companies House record and the local hot-night count.