St Mellons: plumbing, heating and air-conditioning companies
St Mellons has 1 plumbing, heating and air-conditioning companies (SIC 43220) and 0 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 CF3, summer 2026 had ≈12 nights above 18 °C there (12 times the 1991–2020 average of 1.0).
SIC 43220
Open a company
RYLAND PLUMBING & HEATING LTD, incorporated 2023, status Active.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| RYLAND PLUMBING & HEATING LTD | 2023 | Active | CF3 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| No SIC 43210 or 43290 company in this town | — | — | — | — |
Nearest plumbing companies within 25 km
788 plumbing companies (SIC 43220) have a registered office within 25 km. The nearest 10 are listed.
| Company | Number | District | Distance |
|---|---|---|---|
| A & N PLUMBING SERVICES LIMITED | 06565672 | CF3 | under 0.1 km |
| PEN-Y-BRYN SERVICES LIMITED | 17088558 | CF3 | under 0.1 km |
| IGNITE GAS HEATING & PLUMBING LTD | 09965933 | CF3 | ≈0.7 km |
| R.S. GASCARE LTD | 08660873 | CF3 | ≈0.7 km |
| COOLCARE TECHNICAL SERVICES LIMITED | 04134664 | CF3 | ≈0.7 km |
| MDP MECHANICAL SERVICES LIMITED | 08408638 | CF3 | ≈0.7 km |
| AMBIENT AIR CONTROL LIMITED | 03577752 | CF3 | ≈0.8 km |
| TREMORFA LTD | 01825211 | CF3 | ≈0.8 km |
| TRI 3 LTD | 14958302 | CF3 | ≈0.9 km |
| PLUMBFIXER LTD | 14995891 | CF3 | ≈1.2 km |
Heat and planning around St Mellons
In St Mellons last summer (2026) there were ≈12 nights that stayed above 18 °C — 12 times the 1991–2020 average of 1.0 (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.
1% of sampled postcodes in St Mellons sit in a conservation area (921 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.