The 2025 Building Regulations will require every new home in England to install solar panels and a low-carbon heating system, typically an air-source heat pump. The Department for Levelling Up, Housing and Communities confirmed the mandate in a technical consultation response published last week, as reported by pv magazine International. The rule applies to all new dwellings submitted for planning after 1 January 2025. Existing homes are unaffected, for now.
Who qualifies, and who doesn’t
The mandate covers all new-build single-family homes, flats, and apartment blocks in England. Wales, Scotland and Northern Ireland have separate building standards and are not yet following suit. Homes built under permitted development rights, such as some small self-build projects, are temporarily exempt until 2027. The rules also apply to new-build extensions that increase floor area by more than 50%, a detail that caught many architects off guard, according to trade body the Federation of Master Builders.
What it costs a typical 3-bed semi
The Home Builders Federation estimates the upfront cost at £5,000–£7,000 per home for a 3–4 kW solar array and a 6–8 kW air-source heat pump. That’s roughly 2–3% of the average new-build price in England (£312,000 in 2024, per ONS). Energy Savings Trust modelling suggests the combination can reduce annual heating and electricity bills by £300–£500 for a typical 3-bed semi using 12,000 kWh of gas and 3,500 kWh of electricity. The solar panels alone might generate 3,400 kWh per year, of which about half is used directly in a well-insulated home; the rest is exported to the grid under the Smart Export Guarantee at roughly 6–8p per kWh.
The catch: grid capacity and installer shortages
Yet the policy lands at a moment of acute pressure on the UK’s electricity grid. National Grid ESO has warned that local distribution networks in parts of the South East and Midlands are already at capacity for new solar connections. Installers, meanwhile, are in short supply: the Heat Pump Association says the UK needs 30,000 trained heat pump engineers by 2028, but currently has fewer than 8,000. The government has launched a £5 million skills fund, but trade bodies say that is a fraction of what is needed. What this misses is a plan for retrofitting the 28 million existing homes that will not benefit from the new rules. The Climate Change Committee has repeatedly advised that the UK needs to retrofit 1.8 million homes per year by 2028; current rates are around 200,000.
What homeowners should do now
If you are buying a new-build home after January 2025, check that the developer has included solar panels and a heat pump in the specification, some may try to use loopholes such as shared ground-source arrays in apartment blocks. For existing homeowners, the mandate does not apply, but the Boiler Upgrade Scheme offers £7,500 off an air-source heat pump until March 2027. Households on standard variable tariffs can apply through gov.uk from 4 November. Eligibility closes on 31 March 2027. The window is limited: last year’s scheme ran out of funding by October.
Frequently Asked Questions
Yes, from 1 January 2025, all new homes submitted for planning in England must include solar panels and a low-carbon heating system, typically an air-source heat pump. This rule applies to new-build single-family homes, flats, and apartment blocks, as well as extensions that increase floor area by more than 50%. Existing homes are not affected by this mandate.
The Home Builders Federation estimates an upfront cost of £5,000–£7,000 per home for a 3–4 kW solar array and a 6–8 kW air-source heat pump. This represents roughly 2–3% of the average new-build price in England, which was £312,000 in 2024. The combination can reduce annual heating and electricity bills by £300–£500 for a typical 3-bed semi-detached home.
Yes, the Boiler Upgrade Scheme offers a £7,500 discount on an air-source heat pump for existing homeowners until March 2027. This grant is available to households on standard variable tariffs, and you can apply through gov.uk. The mandate for new homes does not apply to existing properties, but this scheme helps offset installation costs.
Homes built under permitted development rights, such as some small self-build projects, are temporarily exempt from the mandate until 2027. Also, the rules do not apply to existing homes or to properties in Wales, Scotland, and Northern Ireland, which have separate building standards. Extensions increasing floor area by more than 50% are covered, catching many off guard.
No, the UK currently has fewer than 8,000 trained heat pump engineers, but the Heat Pump Association says 30,000 are needed by 2028. The government has launched a £5 million skills fund, but trade bodies say this is insufficient. This shortage could affect installation timelines for new homes and the broader retrofit of 28 million existing homes.
