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Plumbing, heating and air-conditioning companies
48,697 plumbing, heating and air-conditioning companies are registered in England, 1,829 in Wales and 3,373 in Scotland (SIC 43220, Companies House, 1 Sep 2026). If you have an outcode, N1 opens London.
53,899 companies
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N1 opens London.
Companies by nation
| Nation | SIC 43220 | SIC 43210 and 43290 | Page |
|---|---|---|---|
| England | 48,697 | 84,345 | profile page |
| Wales | 1,829 | 3,352 | profile page |
| Scotland | 3,373 | 5,674 | profile page |
| Unresolved | 272 | 510 | city list only |
Largest towns
| Town | SIC 43220 | SIC 43210 and 43290 | Nation |
|---|---|---|---|
| London | 5,475 | 9,239 | England |
| Glasgow | 817 | 1,417 | Scotland |
| Birmingham | 769 | 1,220 | England |
| Manchester | 718 | 1,282 | England |
| Bristol | 601 | 1,070 | England |
| Liverpool | 526 | 999 | England |
| Nottingham | 519 | 981 | England |
| Leeds | 503 | 899 | England |
| Leicester | 432 | 751 | England |
| Cardiff | 430 | 750 | Wales |
| Sheffield | 391 | 682 | England |
| Norwich | 359 | 535 | England |
| Southampton | 348 | 599 | England |
| Ilford | 314 | 459 | England |
| Bolton | 292 | 463 | England |
| Milton Keynes | 283 | 419 | England |
| Reading | 275 | 335 | England |
| Bradford | 271 | 362 | England |
| Northampton | 269 | 499 | England |
| Coventry | 266 | 432 | England |
| Colchester | 265 | 417 | England |
| Luton | 264 | 403 | England |
| Stoke-on-Trent | 260 | 374 | England |
| Romford | 255 | 530 | England |
| Edinburgh | 253 | 364 | Scotland |
| Harrow | 249 | 457 | England |
| Preston | 241 | 375 | England |
| Derby | 233 | 350 | England |
| Hull | 232 | 391 | England |
| Newcastle upon Tyne | 217 | 355 | England |
| Doncaster | 216 | 445 | England |
| Bedford | 216 | 352 | England |
| Slough | 213 | 255 | England |
| Wolverhampton | 210 | 357 | England |
| Swansea | 208 | 308 | Wales |
| Swindon | 201 | 254 | England |
| Stockport | 200 | 350 | England |
| Basildon | 196 | 462 | England |
| Bournemouth | 192 | 292 | England |
| Portsmouth | 192 | 284 | England |
| Rotherham | 189 | 312 | England |
| Plymouth | 189 | 267 | England |
| Croydon | 188 | 273 | England |
| Watford | 184 | 294 | England |
| Wigan | 177 | 329 | England |
| Peterborough | 174 | 366 | England |
| Dartford | 173 | 323 | England |
| Brighton | 172 | 275 | England |
| Maidstone | 169 | 338 | England |
| Chelmsford | 165 | 315 | England |
| Ipswich | 164 | 310 | England |
| Lincoln | 164 | 226 | England |
| Fareham | 161 | 222 | England |
| Warrington | 159 | 338 | England |
| Waterlooville | 159 | 312 | England |
| High Wycombe | 159 | 239 | England |
| Walsall | 158 | 301 | England |
| Bromley | 155 | 208 | England |
| Sutton | 153 | 200 | England |
| Huddersfield | 152 | 268 | England |
| Enfield | 149 | 262 | England |
| York | 148 | 258 | England |
| Aylesbury | 145 | 214 | England |
| Barnsley | 144 | 287 | England |
| Chatham | 144 | 217 | England |
| Dagenham | 143 | 288 | England |
| Gravesend | 138 | 228 | England |
| Wembley | 138 | 206 | England |
| Gloucester | 137 | 302 | England |
| Dundee | 136 | 244 | Scotland |
| Cambridge | 136 | 229 | England |
| Solihull | 135 | 262 | England |
| Chesterfield | 135 | 219 | England |
| Oldham | 133 | 292 | England |
| Rochester | 132 | 269 | England |
| Poole | 128 | 274 | England |
| Cheltenham | 128 | 207 | England |
| Exeter | 128 | 187 | England |
| Hayes | 128 | 172 | England |
| Wakefield | 126 | 240 | England |
| Leigh-on-Sea | 125 | 305 | England |
| Grimsby | 125 | 256 | England |
| Hornchurch | 121 | 232 | England |
| Stevenage | 121 | 222 | England |
| Harlow | 121 | 214 | England |
| Hemel Hempstead | 120 | 263 | England |
| Sidcup | 120 | 236 | England |
| Ashford, England | 118 | 209 | England |
| Bury St Edmunds | 116 | 213 | England |
| Aberdeen | 113 | 185 | Scotland |
| Chorley | 112 | 186 | England |
| Worthing | 111 | 178 | England |
| Gillingham, Medway | 111 | 174 | England |
| St Albans | 110 | 182 | England |
| Edgware | 110 | 161 | England |
| Brentwood | 109 | 213 | England |
| Newport, Wales | 107 | 205 | Wales |
| Barnet | 107 | 174 | England |
| Dunstable | 107 | 163 | England |
| Kettering | 106 | 131 | England |
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. MCS air-to-air confirmed in this catalogue: 0, checked 25 Sep 2026. The outcode search opens the town with the most registered offices in that district, or the nearest town centroid when the district has none.
Better than a national list with no place data: each town opens the company records and the local hot-night count.