Hertfordshire: plumbing, heating and air-conditioning companies
Hertfordshire has 33 plumbing, heating and air-conditioning companies (SIC 43220) and 44 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 EN11, summer 2026 had ≈11 nights above 18 °C there (7 times the 1991–2020 average of 1.6).
SIC 43220
Open a company
A B W SERVICES LIMITED, incorporated 2004, status Active.
Plumbing, heating and air-conditioning companies
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| S J ENGINEERING LIMITED | 43290 · other construction installation | 2002 | Active | AL4 |
| THORNTON ELECTRICAL (LONDON) LIMITED | 43210 · electrical installation | 2006 | Active | EN6 |
| G&P ELECTRICAL LIMITED | 43210 · electrical installation | 2006 | Active | SG14 |
| K K ELECTRICAL LIMITED | 43210 · electrical installation | 2007 | Active | SG14 |
| SAMSON ELECTRICAL SERVICES LIMITED | 43210 · electrical installation; 35130 | 2005 | Active | SG14 |
| ACTIVE ELECTRICAL INSTALLATIONS LTD | 43210 · electrical installation | 2004 | Active | SG13 |
| WRENS ELECTRICAL LIMITED | 43210 · electrical installation | 2000 | Active | AL5 |
| VOLKERWESSELS SPECIALIST BUSINESSES LIMITED | 43290 · other construction installation; 42990; 43999 | 2024 | Active | EN11 |
| RJK ELECTRICAL SERVICES LTD | 43210 · electrical installation; 43290 · other construction installation; 43999 | 2023 | Active | WD6 |
| JOHN CONNOR GAS SERVICES LIMITED | 43290 · other construction installation | 2003 | Active | SG12 |
| MILLENNIUM SOLUTIONS (HERTS) LTD | 43210 · electrical installation | 2006 | Active | EN10 |
| SOLURO LTD | 43290 · other construction installation | 2006 | Active | EN11 |
| ASHVALE TECHNOLOGY LTD | 43210 · electrical installation | 1997 | Active | SG12 |
| LEE ELECTRICAL LIMITED | 43210 · electrical installation | 1997 | Active | EN11 |
| GIGALAN LTD | 43210 · electrical installation; 43290 · other construction installation | 2017 | Active | WD6 |
| K WALSH ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2003 | Active | EN4 |
| G B ELECTRICAL LIMITED | 43210 · electrical installation | 2002 | Active | EN11 |
| S.G. ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 1998 | Active | WD25 |
| TYVIN ESTATES LIMITED | 43290 · other construction installation | 1968 | Active | EN8 |
| PHASE ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2005 | Active | EN8 |
| M GREAVES CONSTRUCTION LIMITED | 43290 · other construction installation | 2006 | Active | HP2 |
| AVENTE LIMITED | 43210 · electrical installation; 63110 | 2004 | Active | WD25 |
| A&M INSTALLATIONS LTD | 43290 · other construction installation | 2021 | Active | HP3 |
| 1ST CLASS DATA AND ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2001 | Active | HP2 |
| LONGDEAN LIMITED | 43210 · electrical installation | 2003 | Active | HP3 |
| CONSTRUCTION & SHOPFITTING LIMITED | 43290 · other construction installation | 1998 | Active | WD4 |
| D.B. REES (DRY LINING) LIMITED | 43290 · other construction installation | 1977 | Active | WD4 |
| M.C.D. ELECTRICAL ENGINEERING SERVICES LTD | 43210 · electrical installation | 2000 | Active | HP2 |
| JAMES STRIVENS ELECTRICAL LIMITED | 43210 · electrical installation | 2016 | Active | HP3 |
| MAMCO CONSULTANTS LIMITED | 43290 · other construction installation; 41201 | 2005 | Active | HP3 |
| HIGH VOLTAGE ELECTRICAL SERVICES LIMITED | 43210 · electrical installation | 2007 | Active | WD3 |
| CREAGUS INSTALLATIONS LIMITED | 43210 · electrical installation | 2004 | Active | WD18 |
| ELECTRIC MOTOR & MECHANICAL SERVICES LTD | 43210 · electrical installation | 2002 | Active | SG7 |
| LANDWORTH ELECTRICS LIMITED | 43210 · electrical installation | 2007 | Active | WD3 |
| G.T. CANNON ELECTRICAL LIMITED | 43210 · electrical installation | 2003 | Active | SG7 |
| ONIX SYSTEMS LTD | 43210 · electrical installation | 1996 | Active | SG7 |
| SLOANE CURTIS INTERIORS LTD | 43290 · other construction installation | 2015 | Active | SG7 |
| ESSEX ELECTRICAL (CONTRACTS) LIMITED | 43210 · electrical installation | 2007 | Active | CM21 |
| SJ POULTER BUILDING SERVICES LIMITED | 43290 · other construction installation | 2004 | Active | CM23 |
| LL FITTERS LTD | 43290 · other construction installation | 2021 | Active | SG14 |
| DAZ IDRIS LIMITED | 43210 · electrical installation | 2017 | Active - Proposal to Strike off | HP3 |
| GINGER SPARKS LTD | 43210 · electrical installation | 2019 | Active - Proposal to Strike off | HP1 |
| SITE,SECURE,FIRE & SECURITY LIMITED | 43210 · electrical installation | 2018 | Active - Proposal to Strike off | SG6 |
| 1ST RESET LIMITED | 43210 · electrical installation | 2004 | Liquidation | SG9 |
Heat and planning around Hertfordshire
In Hertfordshire last summer (2026) there were ≈10.3 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 34 postcode districts where these offices are registered.
15% of sampled postcodes in Hertfordshire sit in a conservation area (25,050 live postcodes across 34 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.