County Durham: plumbing, heating and air-conditioning companies
County Durham has 8 plumbing, heating and air-conditioning companies (SIC 43220) and 6 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 DH9, summer 2026 had ≈0 nights above 18 °C there (below the 1991–2020 average of 0.2).
SIC 43220
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AHS (SITE SERVICES) LTD, incorporated 2025, status Active.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| AHS (SITE SERVICES) LTD | 2025 | Active | DL4 |
| GLENN MULLER PLUMBING & GAS SERVICES LIMITED | 2004 | Active | DL5 |
| STEWART CHAPMAN PLUMBING & HEATING LTD. | 2002 | Active | DL3 |
| NORCO HEAT SERVICES LIMITED | 2006 | Active | DH3 |
| PW FIRE LIMITED | 2024 | Active | DH9 |
| NEIL STOREY PLUMBING & HEATING LIMITED | 2004 | Active | DH9 |
| LEYBOURNE URWIN LIMITED | 1935 | Active | DH9 |
| AMB GROUP LTD | 2016 | Active - Proposal to Strike off | DL3 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| POWER TECH (NORTHERN) LIMITED | 43210 · electrical installation | 2009 | Active | DL17 |
| A PATTERSON INSTALLATION LIMITED | 43210 · electrical installation | 2006 | Active | DL14 |
| ALMOND WINDOWS LIMITED | 43290 · other construction installation; 43342 | 2003 | Active | SR8 |
| DARLINGTON DOOR SERVICES LIMITED | 43290 · other construction installation | 1999 | Active | DL1 |
| SECURE ELECTRONIC ENGINEERING LTD | 43210 · electrical installation | 2009 | Active | DL3 |
| J. R. FORBES ELECTRICAL LTD | 43210 · electrical installation | 2004 | Active | DH8 |
Heat and planning around County Durham
In County Durham last summer (2026) there were ≈0.5 nights that stayed above 18 °C — 2 times the 1991–2020 average of 0.3 (ERA5 reanalysis, grid ≈30 km, lower than street temperatures in cities). The figure is the household-weighted mean of 10 postcode districts where these offices are registered.
8% of sampled postcodes in County Durham sit in a conservation area (9,668 live postcodes across 10 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.