Home / Installers / Harpenden
FIRST PLUMBING LTD: plumbing, heating and air-conditioning company in Harpenden
FIRST PLUMBING LTD is an active limited company (no. 14582300), incorporated in 2023, registered for plumbing, heating and air-conditioning installation (SIC 43220), with its registered office in AL5 (Harpenden), and 305 similar companies have a registered office within 10 km. If you need an MCS-certified air-to-air installer, MCS lists 0 installers certified for air-to-air heat pumps yet (checked 25 Sep 2026), so no company here can offer the £2,500 grant route today.
Active
Within 10 km
305 similar companies within 10 km. Harpenden
What homes around AL5 need
In AL5 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).
30% of sampled postcodes in AL5 sit in a conservation area (on-record, 1,057 live postcodes).
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).
Hot nights: ERA5-ARCO, June–August, minimum at or above 18 °C, 2026 against the 1991–2020 mean, retrieved 25 Sep 2026. Conservation-area share: sampled postcode points, snapshot 25 Sep 2026. Noise limit from the decision contract, checked 25 Sep 2026.
Nearest similar companies
| Company | Number | District | Distance |
|---|---|---|---|
| PLUMB MARSHALL LTD | 12430264 | AL5 | ≈0.2 km |
| SHIRE ELECTRICAL SERVICES LIMITED | 09741510 | AL5 | ≈0.7 km |
| AC-SQD LTD | 10655249 | AL5 | ≈0.9 km |
| EAST & GRAY LTD | 09379350 | AL5 | ≈1.0 km |
| CK PLUMBERS LTD | 13896481 | AL5 | ≈1.2 km |
| WALKER MECHANICAL SERVICES LTD | 15541331 | AL5 | ≈1.2 km |
| HARPENDEN PLUMBING AND HEATING LIMITED | 10022268 | AL5 | ≈1.4 km |
| RISELEY PLUMBING SERVICES LIMITED | 04670079 | AL5 | ≈1.5 km |
| HERTFORDSHIRE AIR CONDITIONING LIMITED | 09636085 | AL5 | ≈1.5 km |
| HONEY BEAR ENERGY LIMITED | 17353353 | AL5 | ≈1.7 km |
Company record
| Field | Value |
|---|---|
| Company number | 14582300 |
| Name | FIRST PLUMBING LTD |
| Status | Active |
| Incorporated | 10 Jan 2023 |
| SIC | 43220 · plumbing, heat and air-conditioning installation |
| Registered office postcode | AL5 1SW |
| Outcode | AL5 |
| Nation | England |
| Air-to-air signal | not yet observed, checked 25 Sep 2026 |
| F-Gas | not yet observed, checked 25 Sep 2026 |
| MCS air-to-air | not yet observed, checked 25 Sep 2026 |
| Retrieved | 25 Sep 2026 |
| Dataset | https://download.companieshouse.gov.uk/BasicCompanyDataAsOneFile-2026-09-01.zip |
| Companies House page | Company 14582300 |
Companies House record: FIRST PLUMBING LTD, company 14582300, status Active, 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. Snapshot 1 Sep 2026, retrieved 25 Sep 2026. The 10 km count is equirectangular to 0.1 km. MCS air-to-air confirmed in this catalogue: 0, checked 25 Sep 2026.
Better than a reviews catalogue: the Companies House record, the district hot-night count and the MCS air-to-air observation are on one page.