Welwyn Garden City: plumbing, heating and air-conditioning companies
Welwyn Garden City has 43 plumbing, heating and air-conditioning companies (SIC 43220) and 91 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 AL7, summer 2026 had ≈11 nights above 18 °C there (7 times the 1991–2020 average of 1.5).
SIC 43220
Open a company
A.L. MECHANICAL LIMITED, incorporated 2023, status Active.
Plumbing, heating and air-conditioning companies
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| ALELECTRICAL (HERTS) LIMITED | 43210 · electrical installation | 2024 | Active | AL7 |
| CHAPMAN VENTILATION LIMITED | 43290 · other construction installation; 71129 | 2007 | Active | AL7 |
| SILVER FOX LIMITED | 43210 · electrical installation; 27900; 61100 | 1977 | Active | AL7 |
| ELEC COMPLY LTD | 43210 · electrical installation | 2024 | Active | AL7 |
| SENTRILINK SECURITY LTD | 43210 · electrical installation; 80100; 80200 | 2026 | Active | AL7 |
| G & B PROJECT SOLUTIONS LIMITED | 43290 · other construction installation | 2025 | Active | AL7 |
| PENTACLE ELECTRICAL AND SECURITY LTD | 43210 · electrical installation; 80200 | 2024 | Active | AL7 |
| SMART ONE ENGINEERING LTD | 43210 · electrical installation; 41202; 62090 | 2023 | Active | AL7 |
| JARRARDS LIMITED | 43210 · electrical installation | 1974 | Active | AL7 |
| MERCURY FIRE LIMITED | 43210 · electrical installation; 25120; 80200; 84250 | 2009 | Active | AL7 |
| MERCURY SECURITY SYSTEMS LTD | 43210 · electrical installation; 25120; 80200; 84250 | 1997 | Active | AL7 |
| HAVENWOOD LODGE LTD | 43290 · other construction installation; 43999 | 2026 | Active | AL7 |
| LMJ ELECTRICAL CONTRACTORS LTD | 43210 · electrical installation; 43390 | 2019 | Active | AL7 |
| RAD ELECTRICAL SOLUTIONS LTD | 43210 · electrical installation | 2023 | Active | AL7 |
| ULTRA KBB LTD | 43290 · other construction installation; 43320 | 2020 | Active | AL7 |
| G.M.I. AERIALS LIMITED | 43210 · electrical installation | 2002 | Active | AL7 |
| GT ELECTRICS LIMITED | 43210 · electrical installation | 2000 | Active | AL7 |
| LITHIUM GRID LIMITED | 43210 · electrical installation; 35130 | 2026 | Active | AL7 |
| SJ SYSTEMS LTD | 43290 · other construction installation; 45200 | 2014 | Active | AL7 |
| MARCOE ENGINEERING LIMITED | 43210 · electrical installation | 1999 | Active | AL7 |
| WILLS HVAC SERVICES IRELAND LTD | 43210 · electrical installation | 2026 | Active | AL7 |
| REFLEX ELITE LTD | 43290 · other construction installation | 2021 | Active | AL7 |
| SUMMIT RENDER SUPPLIES LONDON LIMITED | 43290 · other construction installation | 2021 | Active | AL7 |
| BRUNEL CONSTRUCTION SERVICES LIMITED | 43290 · other construction installation | 2019 | Active | AL7 |
| M.NIC GROUP LTD | 43210 · electrical installation | 2014 | Active | AL7 |
| FALCON GROUP ENGINEERING LTD | 43210 · electrical installation | 2026 | Active | AL7 |
| M&H UTILITIES (AL) LTD | 43290 · other construction installation | 2017 | Active | AL7 |
| GFR ELECTRICAL LIMITED | 43210 · electrical installation | 2026 | Active | AL7 |
| EMERALD COMMERCIAL ELECTRICAL LTD | 43210 · electrical installation | 2018 | Active | AL7 |
| MONKEY DO CREW LIMITED | 43290 · other construction installation | 2018 | Active | AL7 |
| MONKEY SEE SCENERY LIMITED | 43290 · other construction installation | 2016 | Active | AL7 |
| ARG ELECTRICS LTD | 43210 · electrical installation | 2026 | Active | AL7 |
| MR BARRETT ELECTRICAL LTD | 43210 · electrical installation | 2012 | Active | AL7 |
| PHOENIX TOTAL SECURITY LIMITED | 43210 · electrical installation | 1996 | Active | AL7 |
| WE FIX MAINTENANCE LTD | 43210 · electrical installation; 33140 | 2025 | Active | AL7 |
| LINEVIE SERVICES LTD | 43210 · electrical installation; 45200; 81229; 96090 | 2015 | Active | AL7 |
| M&E POWER LIMITED | 43210 · electrical installation; 71129 | 2021 | Active | AL7 |
| STEVEN SETTERFIELD LTD | 43210 · electrical installation | 2014 | Active | AL7 |
| AGT ELECTRICAL SERVICES LTD | 43210 · electrical installation | 2022 | Active | AL7 |
| PAC ELECTRICS LTD | 43210 · electrical installation | 2016 | Active | AL7 |
| STORER ELECTRICAL COMMUNICATIONS LIMITED | 43210 · electrical installation | 2023 | Active | AL7 |
| COUGHLAN ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2015 | Active | AL7 |
| HERTSSPARKY LTD | 43210 · electrical installation; 41201; 41202 | 2026 | Active | AL8 |
| IGD ELECTRICAL LTD | 43210 · electrical installation | 2026 | Active | AL7 |
| HARRIS'S LV CABLE JOINTING LTD | 43210 · electrical installation | 2025 | Active | AL7 |
| MKR SERVICES LTD | 43210 · electrical installation | 2020 | Active | AL7 |
| DJJ RESOURCES LTD | 43290 · other construction installation; 96090 | 2024 | Active | AL7 |
| EMILIO ELECTRIC LTD | 43210 · electrical installation | 2014 | Active | AL7 |
| UNIQUE SURFACES PLUS LIMITED | 43290 · other construction installation | 2017 | Active | AL7 |
| CDI DRYLINING LIMITED | 43290 · other construction installation | 2022 | Active | AL7 |
| PRONET INSTALLATIONS LTD | 43210 · electrical installation | 2025 | Active | AL7 |
| SLOANSWAY LIMITED | 43210 · electrical installation | 2009 | Active | AL7 |
| WDL ELECTRICAL LTD | 43210 · electrical installation | 2021 | Active | AL7 |
| LOVELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2016 | Active | AL8 |
| WELWYN-PROVED INSTALLATIONS LIMITED | 43210 · electrical installation | 2010 | Active | AL7 |
| DELTA CLIMATE SYSTEMS LTD | 43210 · electrical installation; 35300 | 2026 | Active | AL7 |
| WES ONE LIMITED | 43210 · electrical installation; 41201 | 2023 | Active | AL7 |
| HL ELECTRICAL LTD | 43210 · electrical installation | 2018 | Active | AL7 |
| MI7 CONSTRUCTION LTD | 43290 · other construction installation; 41202 | 2021 | Active | AL7 |
| BBB M&E SERVICES LIMITED | 43210 · electrical installation | 2023 | Active | AL7 |
| D CRASHAW LIMITED | 43210 · electrical installation | 2017 | Active | AL7 |
| K CORDES BUILDING SERVICES LTD | 43210 · electrical installation | 2014 | Active | AL7 |
| CPJ ELECTRICAL SERVICES LTD | 43210 · electrical installation | 2024 | Active | AL7 |
| BUILD ON TIME LIMITED | 43290 · other construction installation; 43390 | 2010 | Active | AL7 |
| BLACKSHIRE SERVICES LTD | 43210 · electrical installation; 81210 | 2026 | Active | AL7 |
| CROWN CONTRACTS LIMITED | 43210 · electrical installation | 1986 | Active | AL8 |
| SM BUILDERS & ELECTRICIANS LTD | 43210 · electrical installation; 43390 | 2024 | Active | AL7 |
| NBG ENGINEERING LIMITED | 43210 · electrical installation; 33120; 46460; 46690 | 2022 | Active | AL7 |
| M WHITEHEAD ELECTRICAL LIMITED | 43210 · electrical installation | 2017 | Active | AL7 |
| TMG ELECTRICS LTD | 43210 · electrical installation | 2021 | Active | AL7 |
| ELEVEN 92 LIGHTING LTD. | 43210 · electrical installation; 59111; 59113; 60200 | 2017 | Active | AL8 |
| LOUI GAS SERVICES LTD | 43290 · other construction installation | 2026 | Active | AL7 |
| SMARTIER GROUP LTD | 43290 · other construction installation; 43999 | 2019 | Active | AL8 |
| ADBROOK FIRE PROTECTION LTD | 43290 · other construction installation | 2026 | Active | AL7 |
| BOWSHACKLE LTD | 43210 · electrical installation | 2014 | Active | AL7 |
| SPEAR ELECTRICAL (LONDON) LTD | 43210 · electrical installation | 2016 | Active | AL8 |
| WAYNE CLARK ELECTRICAL LIMITED | 43210 · electrical installation | 2015 | Active | AL8 |
| DRAPERS BLINDS LIMITED | 43290 · other construction installation | 2016 | Active | AL8 |
| COLETTA DOORS SOLUTIONS LIMITED | 43290 · other construction installation | 2011 | Active | AL8 |
| DREWMIN SERVICES LIMITED | 43210 · electrical installation | 2019 | Active | AL8 |
| EKELECTRICS LIMITED | 43210 · electrical installation | 2015 | Active | AL8 |
| IN ESSE LTD | 43210 · electrical installation | 2014 | Active - Proposal to Strike off | AL7 |
| KNOCKMORE ELECTRICAL LTD | 43210 · electrical installation | 2026 | Active - Proposal to Strike off | AL7 |
| RH FACADES & INTERIORS LTD | 43290 · other construction installation; 43310 | 2020 | Active - Proposal to Strike off | AL7 |
| FAST FIX INSTALLATIONS LTD | 43210 · electrical installation; 47540 | 2023 | Active - Proposal to Strike off | AL8 |
| BB ELECTRO COMPANY LIMITED | 43210 · electrical installation | 2022 | Active - Proposal to Strike off | AL7 |
| WELWYN PRESSIVE LTD | 43210 · electrical installation | 2016 | Active - Proposal to Strike off | AL7 |
| ARAY ELECTRICAL LTD | 43210 · electrical installation | 2018 | Active - Proposal to Strike off | AL7 |
| R PARK ELECTRICAL LTD | 43210 · electrical installation | 2019 | Active - Proposal to Strike off | AL7 |
| M S ELECTRICAL LIMITED | 43210 · electrical installation | 2016 | Active - Proposal to Strike off | AL7 |
| ORCHARD ELECTRICAL CONTRACTORS LTD | 43210 · electrical installation | 2020 | Active - Proposal to Strike off | AL8 |
Heat and planning around Welwyn Garden City
In Welwyn Garden City 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 2 postcode districts where these offices are registered.
24% of sampled postcodes in Welwyn Garden City sit in a conservation area (1,315 live postcodes across 2 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.