Can a listed building use Class G for an outdoor unit?
On a listed building Class G does not permit the outdoor unit (G.2(i), checked 25 Sep 2026). The worked case, with every other rear-wall fact filled in and listed set to yes, comes back as planning permission needed.
computed
Worked case from the decision engine
Result on the facts named above: planning permission needed.
A postcode search does not clear listing. The worked case enters listed as yes, which is an address fact, not a hit from the district file.
Volume, noise and listing in the worked case are entered facts. They are not read off the postcode.
Cooling paths
At 400 hours and the Ofgem cap, the split scenario is £27.71 and the portable scenario delivering the same 2.5 kW is £101.23.
| Path | What it is | Up front | £ for 400 h | Open |
|---|---|---|---|---|
| External shading | No outdoor unit | Shelf prices sit in the shade class of the retail file | No compressor draw in the catalogue | /tools/sizing/ |
| Fan | Devola Low Noise 20W 9 Speed 9-inch DC Desk Fan - White - DVF7DCFAN | £59.95 | £2.11 for 400 h at 20 W | /tools/running-cost/ |
| Portable | Cirro® 12000 BTU Super Quiet Smart Portable Air Conditioner - Cooling | £519.99 | £101.23 to deliver 2.5 kW for 400 h at EER 2.6 | /tools/running-cost/ |
| Split / air-to-air | Daikin Perfera 2.5 kW, SEER 9.5 | median shelf £1,027.49 (n=14) | £27.71 for 400 h | /tools/payback/ |
The clauses this situation turns on
ENG-09 · G.2(i) · checked 25 Sep 2026. the air source heat pump would be installed on a building or on land within the curtilage of the dwellinghouse or the block of flats if the dwellinghouse or the block of flats is a listed building Source
Next pages
· · n= · · updated 25 Sep 2026 · version 1.0.0 · CSV of the values on this page