Harpenden: plumbing, heating and air-conditioning companies
Harpenden has 26 plumbing, heating and air-conditioning companies (SIC 43220) and 37 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 AL5, summer 2026 had ≈11 nights above 18 °C there (7 times the 1991–2020 average of 1.5).
SIC 43220
Open a company
AC-SQD LTD, incorporated 2017, status Active.
Plumbing, heating and air-conditioning companies
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| C.J. O'SHAUGHNESSY (BRICKWORK) LIMITED | 43290 · other construction installation | 2001 | Active | AL5 |
| HARPENDEN LIGHTING DESIGN COMPANY LTD | 43210 · electrical installation; 74100 | 2020 | Active | AL5 |
| MAN FOR THE JOB LIMITED | 43290 · other construction installation | 2023 | Active | AL5 |
| J.DEMORNAY LTD | 43290 · other construction installation; 16230 | 2024 | Active | AL5 |
| A1Z CONSTRUCTION LIMITED | 43290 · other construction installation; 41201; 41202 | 2019 | Active | AL5 |
| HARPENDEN ELECTRICAL LIMITED | 43210 · electrical installation | 2006 | Active | AL5 |
| LIFESTYLE LOGIC LIMITED | 43210 · electrical installation; 62020 | 2022 | Active | AL5 |
| VERULAM ELECTRICAL LTD | 43210 · electrical installation | 2026 | Active | AL5 |
| ALWAYS OFF-PEAK LIMITED | 43210 · electrical installation | 2025 | Active | AL5 |
| PAUL 1 SMITH CARPENTRY LIMITED | 43290 · other construction installation | 2017 | Active | AL5 |
| AGL CONSTRUCTION SERVICES LTD | 43210 · electrical installation; 68100; 68209 | 2015 | Active | AL5 |
| CUBED FACILITY MANAGEMENT & MAINTENANCE LIMITED | 43290 · other construction installation; 81299; 96090; 98000 | 2023 | Active | AL5 |
| FRANKLING & OAKLEY LTD | 43290 · other construction installation | 2018 | Active | AL5 |
| KALLON & CO GROUP LIMITED | 43290 · other construction installation | 2024 | Active | AL5 |
| KITCHEN MAKEOVERS LTD | 43290 · other construction installation | 2020 | Active | AL5 |
| M.M.A ESSEX ELECTRICAL LIMITED | 43210 · electrical installation; 33140 | 2025 | Active | AL5 |
| PEPPER PROPERTY SERVICES LTD | 43290 · other construction installation; 43320; 43390 | 2023 | Active | AL5 |
| RESIN LONDON DRIVEWAYS LTD | 43290 · other construction installation; 41201; 41202; 43999 | 2025 | Active | AL5 |
| SOLAS ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2022 | Active | AL5 |
| SQUARE FEET HOLDINGS LTD | 43290 · other construction installation; 41201; 43999 | 2024 | Active | AL5 |
| MODLIGHT ELECTRICAL LTD | 43210 · electrical installation | 2021 | Active | AL5 |
| CES ELECTRICAL LTD | 43210 · electrical installation | 2008 | Active | AL5 |
| KGEC LIMITED | 43210 · electrical installation | 2013 | Active | AL5 |
| SUSTENERGIA LTD | 43210 · electrical installation; 71122; 74901 | 2025 | Active | AL5 |
| HOMEXE LTD | 43210 · electrical installation | 2021 | Active | AL5 |
| J A WRIGHT CONSTRUCTION LTD | 43290 · other construction installation | 2020 | Active | AL5 |
| THENINETEENTH LTD | 43290 · other construction installation | 2026 | Active | AL5 |
| SMART-WATT LTD | 43210 · electrical installation | 2024 | Active | AL5 |
| AV-ZONE LIMITED | 43210 · electrical installation | 2003 | Active | AL5 |
| R. DAVIES CONSTRUCTION LIMITED | 43290 · other construction installation | 2002 | Active | AL5 |
| BAILEY'S ELECTRICAL COMPANY LTD | 43210 · electrical installation | 2020 | Active | AL5 |
| LEWLEC LTD | 43210 · electrical installation | 2018 | Active | AL5 |
| DEEKS ELECTRICAL CONTRACTORS LIMITED | 43210 · electrical installation | 1983 | Active | AL5 |
| DEEKS RENEWABLES LIMITED | 43210 · electrical installation | 2024 | Active | AL5 |
| B.M.HILTON & COMPANY LIMITED | 43290 · other construction installation; 41202 | 1971 | Active | AL5 |
| INCONSTRUCT SERVICES LTD | 43290 · other construction installation | 2016 | Active - Proposal to Strike off | AL5 |
| TOTALCUSTOMUK LIMITED | 43290 · other construction installation | 2018 | Active - Proposal to Strike off | AL5 |
Heat and planning around Harpenden
In Harpenden last summer (2026) there were ≈11 nights that stayed above 18 °C — 7 times the 1991–2020 average of 1.5 (ERA5 reanalysis, grid ≈30 km, lower than street temperatures in cities). The figure is the household-weighted mean of 1 postcode districts where these offices are registered.
30% of sampled postcodes in Harpenden sit in a conservation area (1,057 live postcodes across 1 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.