Caernarfon: plumbing, heating and air-conditioning companies
Caernarfon has 7 plumbing, heating and air-conditioning companies (SIC 43220) and 17 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 LL55, summer 2026 had ≈3 nights above 18 °C there (8 times the 1991–2020 average of 0.4).
SIC 43220
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A & M WILLIAMS PLUMBING & HEATING LIMITED, incorporated 2024, status Active.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| TANAU PLW FIRES LIMITED | 2024 | Active | LL55 |
| SIGMA PROJECTS LTD | 2024 | Active | LL55 |
| ECO GREEN HEATING LTD | 2010 | Active | LL55 |
| ATON SOLAR CYF | 2011 | Active | LL54 |
| VAYNOL PLUMBING & HEATING LTD | 2013 | Active | LL55 |
| A & M WILLIAMS PLUMBING & HEATING LIMITED | 2024 | Active | LL54 |
| GWRES ERYRI CYF | 2011 | Liquidation | LL54 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| G PARRY ELECTRICAL SERVICES LTD | 43210 · electrical installation | 2014 | Active | LL55 |
| ANGLESEY & GWYNEDD GROUNDWORKS LTD | 43290 · other construction installation | 2019 | Active | LL55 |
| D & M FENCING AND GROUNDWORKS CONTRACTORS LTD | 43290 · other construction installation | 2024 | Active | LL54 |
| IWAN FON ELECTRICAL LIMITED | 43210 · electrical installation | 2022 | Active | LL55 |
| BENNEL ELECTRICAL LTD | 43210 · electrical installation; 43390; 71200; 96090 | 2026 | Active | LL55 |
| SNOWDONIA REFRIGERATION AND AIR CONDITIONING LTD | 43210 · electrical installation | 2013 | Active | LL55 |
| GWASANAETHAU ADEILADU A CHYFLEUSTODAU WR CONSTRUCTION AND UTILITY SERVICES LIMITED | 43290 · other construction installation | 2026 | Active | LL54 |
| CONTINUITY ELECTRICAL CONTRACTORS LTD | 43210 · electrical installation | 2016 | Active | LL54 |
| M WILLIAMS ELECTRICAL LIMITED | 43210 · electrical installation | 2014 | Active | LL55 |
| JASON JOS LTD | 43210 · electrical installation | 2017 | Active | LL55 |
| TIRION SOLUTIONS LTD | 43210 · electrical installation; 70229; 71129; 74909 | 2026 | Active | LL55 |
| OWEN ELECTRICAL CONTRACTORS GC LIMITED | 43210 · electrical installation | 2017 | Active | LL55 |
| ABSEIL SERVICES LIMITED | 43290 · other construction installation | 2023 | Active | LL55 |
| CAILLAN HARRIS LTD | 43210 · electrical installation; 43390; 81210 | 2023 | Active | LL55 |
| PEN SOLAR CYF | 43210 · electrical installation | 2023 | Active | LL54 |
| G A HUGHES A'I GWMNI CYFYNGEDIG | 43290 · other construction installation | 2014 | Active | LL54 |
| SPECIALIST INDUSTRIAL ROPE ACCESS SOLUTIONS LIMITED | 43290 · other construction installation | 2017 | Active - Proposal to Strike off | LL54 |
Heat and planning around Caernarfon
In Caernarfon last summer (2026) there were ≈2.7 nights that stayed above 18 °C — 8 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 2 postcode districts where these offices are registered.
7% of sampled postcodes in Caernarfon sit in a conservation area (1,260 live postcodes across 2 districts).
In Wales 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.