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S21: plumbing, heating and air-conditioning companies in Sheffield
S21 (Sheffield) has 17 plumbing, heating and air-conditioning companies registered here (SIC 43220) and 23 electrical and other installation companies (Companies House, 1 Sep 2026); 0 are MCS-certified for air-to-air yet. If the summer is the question, S21 had ≈5 nights above 18 °C in 2026 (10 times the 1991–2020 average of 0.5).
S21
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21 GUN REFRIGERATION LTD, incorporated 2020, status Active.
Plumbing, heating and air-conditioning companies
| Company | Incorporated | Status | District |
|---|---|---|---|
| 21 GUN REFRIGERATION LTD | 2020 | Active | S21 |
| AQUA GAS SERVICES LTD | 2018 | Active | S21 |
| AR PLUMBTECH LIMITED | 2023 | Active | S21 |
| CAPITAL BATHROOMS LTD | 2015 | Active | S21 |
| COMHEAT LTD | 2023 | Active | S21 |
| ENVIRONMENTAL COOLING & HEATING LIMITED | 2025 | Active | S21 |
| FIRST 4 SUPPLIES LIMITED | 2001 | Active | S21 |
| FLOWRIGHT SERVICES LTD | 2026 | Active | S21 |
| FROSTBITE COOLING LTD | 2024 | Active | S21 |
| GAS TIGHT INDUSTRIES LTD | 2017 | Active | S21 |
| JK MECHANICAL LTD | 2019 | Active | S21 |
| KEAN PLUMBING & HEATING LTD | 2023 | Active | S21 |
| LOWE PROPERTY SERVICES LIMITED | 2003 | Active | S21 |
| RLM PLUMBING AND HEATING LIMITED | 2025 | Active | S21 |
| RMK COOLING SYSTEMS LIMITED | 2026 | Active | S21 |
| S. & A. PARSONS (BUILDING CONTRACTORS) LIMITED | 1969 | Active | S21 |
| SOUTH YORKSHIRE BATHROOM DESIGN LIMITED | 2010 | Active | S21 |
Electrical and other installation companies
| Company | SIC | Incorporated | Status | District |
|---|---|---|---|---|
| ABEL ELECTRICAL SERVICES LTD | 43210 · electrical installation | 2023 | Active | S21 |
| ACE ELECTRICAL SOUTH YORKSHIRE LTD | 43210 · electrical installation | 2023 | Active | S21 |
| AVAIL SYSTEMS LIMITED | 43210 · electrical installation | 2010 | Active | S21 |
| CLEARFLOW PRODUCTS LTD | 43290 · other construction installation | 2007 | Active | S21 |
| ELWOOD ELECTRICAL SOLUTIONS LTD | 43210 · electrical installation | 2023 | Active | S21 |
| FIRE SOLUTIONS CONSTRUCTION LTD | 43290 · other construction installation | 2025 | Active | S21 |
| FIRST CALL GATE AUTOMATION LTD | 43210 · electrical installation; 25990; 80200 | 2020 | Active | S21 |
| GOLD SPEC CONSTRUCTION LTD | 43290 · other construction installation | 2023 | Active | S21 |
| HUTCHINSON ELECTRICAL LTD | 43210 · electrical installation | 2019 | Active | S21 |
| INTEMS LTD | 43210 · electrical installation | 2020 | Active | S21 |
| JAMIE MARTIN ELECTRICAL LTD | 43210 · electrical installation | 2016 | Active | S21 |
| M H GEOTECHNICAL LTD | 43290 · other construction installation; 42110; 42120; 43999 | 2022 | Active | S21 |
| MBM ELECTRICAL LIMITED | 43210 · electrical installation | 2023 | Active | S21 |
| MHK DEVELOPMENTS LTD | 43290 · other construction installation; 41100; 86102; 86230 | 2018 | Active | S21 |
| PREMIER WIRING SERVICES LIMITED | 43210 · electrical installation | 2003 | Active | S21 |
| S BARKER PLANT LIMITED | 43290 · other construction installation | 2016 | Active - Proposal to Strike off | S21 |
| SCAIFE GROUP LTD | 43290 · other construction installation | 2021 | Active | S21 |
| SPINSHAW CONTRACT SOLUTIONS LIMITED | 43290 · other construction installation | 2019 | Active - Proposal to Strike off | S21 |
| STEEL PROPERTY DEVELOPMENT AND CONSTRUCTION LIMITED | 43290 · other construction installation; 41100 | 2024 | Active | S21 |
| T.O.C ELECTRICAL LTD | 43210 · electrical installation | 2024 | Active | S21 |
| UPTON INTERIORS LIMITED | 43290 · other construction installation; 43390 | 2023 | Active | S21 |
| WILSON GRANITE INSTALLATIONS LIMITED | 43290 · other construction installation | 2019 | Active | S21 |
| YORKSHIRE CABLE INSTALLATIONS LTD | 43210 · electrical installation | 2025 | Active | S21 |
What homes around S21 need
In S21 last summer (2026) there were ≈5 nights that stayed above 18 °C — 10 times the 1991–2020 average of 0.5 (ERA5 reanalysis, grid ≈30 km, lower than street temperatures in cities).
11% of sampled postcodes in S21 sit in a conservation area (on-record, 467 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).
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 for S21, June–August, minimum at or above 18 °C, retrieved 25 Sep 2026. Conservation-area share: sampled postcode points in S21, snapshot 25 Sep 2026.
Better than a town-wide list: these are the registered offices in S21, with that district's hot nights and planning rule.