Heat pumps for landlords in Bristol

What Bristol’s housing mix means for a heat pump

Bristol has 50,213 privately rented households out of 191,638, which is 26.2% (2021 Census). Owner-occupiers are 54.0% and social tenants 18.7%, so Bristol is less rental-heavy than Oxford or Cambridge, but its rented stock is unusual in one way.

Converted or shared houses are 10.2% of Bristol households, about 19,500 households. That is more than three times the share in Nottingham or Leicester (both 3.0%), and it is the hardest kind of home to fit with a heat pump. Add purpose-built flats at 21.9% (about 42,000) and nearly a third of Bristol households live in a flat of some kind. Terraced homes are the single biggest group at 32.1% (about 61,500), semis 26.6% and detached only 6.0%.

For a landlord that means two very different heat pump questions:

• A terraced house usually has a rear yard or garden for an outdoor unit. The questions are noise, distance to the neighbour and whether the walls are insulated.
• A flat in a converted house has no outdoor space of its own, shares a roof and walls with other flats and sits under a lease. A heat pump here is a building decision, not a flat decision.

These shares cover all households, not only rented ones, so treat them as the backdrop and check your own address.

Heating today: gas, electric and a small heat network

Mains gas heats 75.0% of Bristol homes, about 143,700 households. Electric-only heating is 13.0%, about 24,900, higher than the 11.0% in Nottingham and Leicester. District heating is 1.3%, oil 0.1%, and 1.6% have no central heating.

With oil at 0.1%, the £9,000 off-gas Boiler Upgrade Scheme rate, which needs oil or LPG heating and no mains gas connection, will very rarely apply. Plan on £7,500 for an air-to-water or ground source heat pump.

Worked example (modelled, not a real project)

Inputs: a two-bedroom mid-terrace using 9,000kWh of heat a year (an assumption; the site’s fact sheet uses 12,000kWh for a three-bedroom semi), a gas boiler at 90% efficiency, a heat pump at SCOP 3.0 or 3.5, and the Ofgem cap unit rates for 1 October to 31 December 2026 (electricity 26.32p, gas 7.97p per kWh). Standing charges are left out.

Heating	Fuel needed	Fuel cost a year
Gas boiler, 90%	10,000kWh gas	about £797
Heat pump, SCOP 3.0	3,000kWh electricity	about £790
Heat pump, SCOP 3.5	2,571kWh electricity	about £677

At SCOP 3.0 the tenant’s bill is roughly level with gas. At 3.5 it is about £120 a year lower. The capital side is yours: the Energy Saving Trust gives around £12,000 for a typical air source heat pump before grant, so about £4,500 after the £7,500 grant, before radiators, a cylinder or insulation.

Licensing: check the ward first

Bristol has more overlapping licensing schemes than most cities, so check the property before planning works.

Scheme	Area	In force from
Additional HMO licensing	Citywide	6 August 2024
Selective licensing	Bishopston and Ashley Down, Cotham, Easton	6 August 2024
Selective and additional licensing	Bedminster, Brislington West	6 April 2022
Additional HMO licensing	Horfield	6 April 2022

Selective licensing applies to non-HMO lets, so it catches ordinary family and single-household tenancies, not just shared houses. The council says it inspects licensed properties at least once in the licence period, usually 5 years. A heating change does not by itself need a licence, but a licensed property carries conditions, so ask the council whether your planned works affect them.

Article 4 and conservation areas

Bristol uses Article 4 directions heavily. Converting a family house into a small HMO for 3 to 6 sharers already needs planning permission in Lawrence Hill, Ashley, Cabot, Cotham and Clifton East (since 11 December 2011), Clifton West and Redland (since 21 October 2012), and the North, South and East Bristol and Avonmouth Village areas (since 29 June 2020). New directions take effect on 1 January 2027 in parts of Brislington, Frome Vale, Purdown, Southmead and Horfield, St George and Westbury Park.

That matters for heating because landlords often plan a conversion and a new heating system together. Settle the use first.

For the outdoor unit itself, conservation areas are the bigger issue. The national planning data register lists 34 conservation areas for Bristol, including Clifton, Cotham and Redland, Kingsdown, Montpelier and Bedminster. In a conservation area, the national permitted development rules do not cover an air source unit on a wall or roof that fronts a highway, or one placed nearer the road than the building. Clifton Village has a separate Article 4 direction on external alterations in Royal York Crescent, Cornwallis Crescent, Caledonia Place and West Mall. Permitted development for air source units does not apply to a listed building at all. A rear-garden position on an unlisted terrace is usually the easiest case.

Bristol’s heat network and climate plan

Bristol is one of the cities where district heating may become a real alternative. The council says 35 buildings are connected to the Bristol heat network, supplying heat for the equivalent of almost 13,500 properties, and a 3 megawatt water source heat pump at Castle Park, which it describes as the largest in the UK, feeds it. Bristol was in the government’s Heat Network Zoning Pilot, and in October 2024 the government named it among six places sharing £5.8 million to develop heat network zones.

The council’s One City Climate Strategy estimates that around 160,000 boilers need replacing across the city: around 65,000 buildings connecting to heat networks and around 95,000 needing individual heat pumps. Most terraced rentals are likely to be in the second group, but if you own a block or a large building near the city centre, ask about the network before choosing a heat pump. None of this is a landlord obligation; your legal duties come from the EPC rules and any licence.

Grants and loans for Bristol landlords

• Boiler Upgrade Scheme: £7,500 for air-to-water or ground source. Landlords are eligible. See the BUS page for landlords.
• Warm Homes: Local Grant: GOV.UK lists Bristol as lead authority with £12,662,001 allocated, alongside Bath and North East Somerset and North Somerset. It is for lower-income households in EPC D to G homes, with landlord terms including a no-rent-rise declaration. Read the Warm Homes Local Grant page.
• Bright Green Homes: the council and Bristol City Leap offer free measures to eligible households, open to private rented homes, and aim to fund heat pumps, insulation and solar for at least another 250 low-income private households by March 2028.
• Council energy loan: up to £20,000 at a fixed 4% for private landlords, through Lendology.

EPC C and when a heat pump is wrong

Today the minimum is EPC E. The government plans EPC C by 1 October 2030 with a £10,000 cost cap, but the regulations are not yet laid. See EPC C 2030 and your heating choice.

A heat pump is often the wrong first step when:

• the flat is in a converted house and the freeholder or other leaseholders will not agree;
• the only unit position faces the street in a conservation area;
• the home is solid-walled and poorly insulated, where fabric work comes first;
• it is a small electric-heated flat where an air-to-air system or better storage heaters may fit better.

To test your own property, use the landlord heat pump calculator or send an enquiry. Relevant independent firms contact you, with no charge to you and no obligation.