Holyhead: plumbing, heating and air-conditioning companies
Holyhead has 7 plumbing, heating and air-conditioning companies (SIC 43220) and 9 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 LL65, summer 2026 had ≈4 nights above 18 °C there (4 times the 1991–2020 average of 0.9).
SIC 43220
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D GRIFFITHS PLUMBING & HEATING LIMITED, incorporated 2025, status Active.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| RUSSELL GAS SERVICES LTD | 2018 | Active | LL65 |
| RYDER CONSTRUCTION LTD | 2025 | Active | LL65 |
| D GRIFFITHS PLUMBING & HEATING LIMITED | 2025 | Active | LL65 |
| JAMIE PARKES PLUMBING & HEATING LIMITED | 2022 | Active | LL65 |
| SKL PLUMBING & HEATING LIMITED | 2023 | Active | LL65 |
| PARKINSON PLUMBING AND HEATING LTD | 2026 | Active | LL65 |
| DEWI ROBERTS PLUMBING & HEATING LTD | 2024 | Active | LL65 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| EMYR ROBERTS ELECTRICAL & RENEWABLES LTD | 43210 · electrical installation | 2023 | Active | LL65 |
| PARRY POWER UTILITIES LIMITED | 43210 · electrical installation | 2023 | Active | LL65 |
| LMW ELECTRICAL CONTRACTORS LTD | 43210 · electrical installation | 2023 | Active | LL65 |
| JCM ELECTRICAL CONTRACTORS LIMITED | 43210 · electrical installation | 2021 | Active | LL65 |
| HALL ELECTRICAL LTD | 43210 · electrical installation | 2023 | Active | LL65 |
| JUSTIN TAYLOR BRICKWORKS LIMITED | 43290 · other construction installation | 2016 | Active | LL65 |
| HUGHES & JONES LIMITED | 43210 · electrical installation; 01500; 70229; 71122 | 2022 | Active | LL65 |
| VISION LANDSCAPING AND CONSTRUCTION LTD | 43290 · other construction installation; 64203 | 2025 | Active | LL65 |
| TERRY D HUGHES LTD | 43210 · electrical installation; 33140; 71121; 71129 | 2020 | Active | LL65 |
Heat and planning around Holyhead
In Holyhead last summer (2026) there were ≈4 nights that stayed above 18 °C — 4 times the 1991–2020 average of 0.9 (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.
6% of sampled postcodes in Holyhead sit in a conservation area (923 live postcodes across 1 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.