Air Source Heat Pumps for Bristol Homes

Yes. Most terraces have room for the outdoor unit in the back yard, a side return or on a flat-roofed extension. Under permitted development, a house that isn’t detached can have one air source heat pump, as long as it passes the MCS 020a noise check. We measure up and run the noise calculation at your survey.

It depends on the building. Permitted development covers blocks of flats too, with a smaller outdoor unit of up to 0.6 cubic metres, but as a leaseholder you’ll usually need the freeholder’s permission first. If your block has communal heating, ask the building manager about heat networks before planning anything. An air-to-air heat pump, which heats rooms directly, is another option and now qualifies for a £2,500 grant.

Probably not, if you live in a house. Under the government’s heat network zoning plans, the buildings that can be required to connect are new buildings, larger non-domestic buildings and buildings that are already communally heated. A house with its own boiler isn’t on that list. Bristol City Council says almost every building will need to switch to low carbon heating or connect to a heat network, and for most houses that means a heat pump. See the government’s zoning overview.

To be permitted development, the heat pump has to pass the MCS 020a sound calculation, which sets an overall limit of 37 dB(A) at your neighbour’s nearest window or door to a habitable room. The calculation includes the unit’s sound level, the distance, any solid barrier and nearby surfaces that reflect sound. If no spot passes, the heat pump can still go in, but it needs a planning application. See MCS’s summary of the standard.

Not usually, but the rules are tighter. Bristol has 33 conservation areas. In them, the outdoor unit can’t go on a wall or roof that faces a road, or be nearer the road than any part of the house. Homes within the grounds of a listed building need permission. You can check your address using the council’s conservation area pages. Rules from the Planning Portal. Permitted development rights can be removed by a planning condition or an Article 4 Direction, so we check your address at the survey.

Yes, on a flat roof such as a kitchen extension, as long as every part of the unit is at least 1m from the roof edge. Heat pumps can’t go on a pitched roof under permitted development. We also check the roof can take the weight and that there’s safe access for servicing.

Only if your home is heated by oil or LPG and has no mains gas connection, and only until March 2027. That’s rare in Bristol: 0.1% of homes heat with oil only and 0.3% with tank or bottled gas only. Most homes are on mains gas, so the grant is £7,500. See GOV.UK for the current amounts.