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G J KNIGHT AND CO LIMITED: plumbing, heating and air-conditioning company in Berkhamsted
G J KNIGHT AND CO LIMITED is an active limited company (no. 10283345), incorporated in 2016, registered for plumbing, heating and air-conditioning installation (SIC 43220), with its registered office in HP4 (Berkhamsted), and 213 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
213 similar companies within 10 km. Berkhamsted
What homes around HP4 need
In HP4 last summer (2026) there were ≈10 nights that stayed above 18 °C — 8 times the 1991–2020 average of 1.3 (ERA5 reanalysis, grid ≈30 km, lower than street temperatures in cities).
31% of sampled postcodes in HP4 sit in a conservation area (on-record, 737 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 |
|---|---|---|---|
| CMD FACILITIES LTD | 12651525 | LU6 | ≈1.6 km |
| ASCROFT HEATING SOLUTIONS LIMITED | 13247687 | LU6 | ≈2.6 km |
| CHAPPELL PLUMBING AND HEATING LTD | 09365225 | LU6 | ≈3.5 km |
| AIR CONDITIONING & SMART ENERGY SOLUTIONS LTD | 14393310 | LU6 | ≈3.8 km |
| ABSALOM AND LUFF HEATING SOLUTIONS LTD | 09164047 | LU6 | ≈4.0 km |
| PACIFIC HEAT (SOUTHERN) LIMITED | 08479597 | LU6 | ≈4.6 km |
| TEKCOS (PLUMBING, HEATING & ELECTRICAL) LTD | 08451175 | LU6 | ≈4.9 km |
| ECO PLUMBER 21 LIMITED | 14134440 | LU6 | ≈5.0 km |
| AJG PLUMBING AND HEATING LTD | 16078882 | LU6 | ≈5.0 km |
| AJ HEATING SOLUTIONS LIMITED | 17129652 | LU6 | ≈5.1 km |
Company record
| Field | Value |
|---|---|
| Company number | 10283345 |
| Name | G J KNIGHT AND CO LIMITED |
| Status | Active |
| Incorporated | 18 Jul 2016 |
| SIC | 43220 · plumbing, heat and air-conditioning installation |
| Registered office postcode | HP4 1RW |
| Outcode | HP4 |
| 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 10283345 |
Companies House record: G J KNIGHT AND CO LIMITED, company 10283345, 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.