Do New Build Homes Have to Have Heat Pumps?

New build homes do not have to have heat pumps by name, but in practice most new homes in England will need a heat pump or a heat network connection once the Future Homes Standard takes effect on 24 March 2027. Scotland went further first: new homes applying for a building warrant from 1 April 2024 cannot use gas or oil boilers. Wales tightens its rules from 4 March 2027, and Northern Ireland has no low carbon heating requirement for new homes yet.

Below we set out the rules in each nation as of September 2026, the transitional deadlines, what self-builders can claim, and how our engineers design a heat pump into a new build.

What Does the Future Homes Standard Require for Heating in England?

The Future Homes Standard requires new homes in England to be “zero carbon ready”, which in practice means low carbon heating such as a heat pump, plus solar panels on most houses. The government published its final response and the new Approved Document L on 24 March 2026. The ministerial statement says new homes must be fitted with low carbon heating such as heat pumps and will emit at least 75% less carbon than homes built to 2013 standards.

“Zero carbon ready” means a home that will not need retrofitting to become zero carbon once the electricity grid is fully decarbonised. A gas boiler can never meet that test. The standard also requires on-site renewable electricity, with guidance pointing to solar panels equal to 40% of each dwelling’s ground floor area. Taller blocks of flats with limited roof space get exemptions.

Are Gas Boilers Banned in New Homes in England?

Gas boilers are not banned by name, but the Future Homes Standard targets are set so that a gas boiler is very unlikely to pass. Compliance is judged against a notional home, which now uses an air source heat pump with a coefficient of performance of 2.5 in the SAP calculation. The government’s response states that boilers are “unlikely to be present in new buildings” given the guidance on the carbon intensity of fuel for heat. The realistic choices are a heat pump, a heat network, or in some small flats direct electric heating.

When Does the Future Homes Standard Come Into Force?

The Future Homes Standard applies in England from 24 March 2027, and the transitional window for homes registered under the old rules closes on 24 March 2028. To build to the current Part L 2021 rules, two things must both happen. A building notice, initial notice or full plans application must reach building control before 24 March 2027. Then work on that specific building must start before 24 March 2028.

The test applies building by building, not to a whole site. On a large estate, plots that are not started by 24 March 2028 must be built to the new standard even if other plots on the same site went up under the 2021 rules. Higher-risk buildings follow a later date of 24 September 2027.

What Do the Current Part L 2021 Rules Require?

Homes built under Part L 2021 can still have a gas boiler, but they must produce around 30% less CO2 than homes built to the previous standard. This interim uplift took effect on 15 June 2022, and it is why so many new estates finished in 2026 have a gas boiler paired with solar panels.

The Part L 2021 notional home uses a mains gas boiler with radiators at a design flow temperature of 55°C, solar PV sized from 40% of the ground floor area, and wastewater heat recovery on showers. New wet heating systems should be designed to heat the home at 55°C or lower, which makes a later switch to a heat pump easier. The limiting fabric values (0.26 W/m²K for walls, 0.16 for roofs, 0.18 for floors, 1.6 for windows) are unchanged in Approved Document L 2026, so the big change in 2027 is the heating.

Does Scotland Ban Gas Boilers in New Homes?

Yes, Scotland’s New Build Heat Standard bans direct emissions heating, including gas and oil boilers, in new buildings that apply for a building warrant from 1 April 2024. It is set out in standard 6.11 of the Building (Scotland) Regulations 2004. Heat pumps, heat networks and direct electric heating all comply because they produce no emissions at the point of use.

The standard was adjusted after it started. In September 2024 the Scottish Government issued a Direction that temporarily disapplied the rule for bioenergy and peat heating, so wood burning stoves could go into new homes, and it then set out an amendment to the standard itself. Gas and oil boilers remain ruled out. The date that matters is the building warrant application, not completion.

What Are the Rules in Wales and Northern Ireland?

Wales introduces tougher Part L rules on 4 March 2027 built around a heat pump notional home, while Northern Ireland currently has no requirement for low carbon heating in new homes. Welsh private homes can still be built with gas boilers until then, under a 2022 Part L that set a 37% cut in carbon emissions for new dwellings.

Wales already banned fossil fuel heating in new social homes funded by the Welsh Government from 1 October 2021. Its Approved Document L 2026 was published on 7 April 2026 and applies from 4 March 2027, with projects notified before then given until 3 March 2028 to start. Industry analysis of the consultation outcome reports a heat pump and solar PV in the Welsh notional home.

Northern Ireland raised its standards on 30 June 2022, targeting a 40% improvement for new houses, without requiring heat pumps. A 2023 discussion document considered making oil boilers unviable in most new buildings. The Department of Finance has said a further consultation with draft regulations would come before any change.

Do Self-Builders Have to Follow the Same Rules?

Yes, a self-build must meet the same building regulations as a developer’s home, including the Future Homes Standard for any build that misses the transitional deadline. In England, a self-builder who submits full plans before 24 March 2027 and starts on site before 24 March 2028 can build to Part L 2021. Miss either date and the new standard applies.

Even under Part L 2021, we rarely see a strong case for a gas boiler in a self-build. You skip the gas connection, and a self-build is one of the few new homes that can claim a heat pump grant. In Scotland the New Build Heat Standard covers self-builds like any other new home.

Can a Self-Build Get the Boiler Upgrade Scheme Grant?

Yes, self-builds in England and Wales can get the £7,500 Boiler Upgrade Scheme grant for an air or ground source heat pump, but homes built by a developer cannot. Ofgem defines a self-build as a home built by, or for, an individual to live in. It must be built mainly with that person’s own labour or money, never owned by a company, and not part of a development sold with predetermined plans.

Your installer will need evidence such as proof of ownership, funding documents, evidence of construction activity and bank statements. Biomass boilers are not eligible in self-builds. The £9,000 off-gas-grid rate is for homes currently heated by oil or LPG, so it is unlikely to apply to a new self-build.

VAT works in your favour too. HMRC zero-rates energy-saving materials installed during the construction of a new dwelling, and heat pump installations in general carry 0% VAT until 31 March 2027.

How Should a Heat Pump Be Designed Into a New Build?

A heat pump should be designed in from the start, with a room-by-room heat loss calculation, emitters sized for a low flow temperature, a cylinder cupboard and a planned spot for the outdoor unit. Getting these right on paper costs little. Fixing them after plastering costs a lot.

MCS installers follow MIS 3005-D, which requires a room-by-room heat loss calculation to BS EN 12831-1 and says high temperature heat pumps should be avoided unless a flow above 55°C is needed. Flow temperature drives efficiency. The MCS Heat Emitter Guide gives 6 stars to systems running at up to 35°C, 5 stars at 36–40°C and 4 stars at 41–45°C. A well-insulated new build with the right emitters can sit in the top bands.

Is Underfloor Heating the Best Choice With a Heat Pump?

Underfloor heating is usually the best match in a new build, because its large warm surface lets the heat pump run at the lowest flow temperatures. Upstairs, larger radiators work well if you want to avoid a second screed. What matters is that every room reaches its design temperature at the same low flow temperature.

How Much Space Does the Hot Water Cylinder Need?

Plan a dedicated cupboard for an unvented cylinder, because a heat pump heats a stored tank of water rather than heating water on demand like a combi boiler. MIS 3005-D sizes daily hot water demand at 45 litres multiplied by the number of bedrooms plus one, or the number of known occupants if higher. For example, a typical four-bedroom self-build would be designed around 225 litres of hot water use a day. Leave room around the cylinder for the expansion vessel, valves and controls, and keep it close to the bathrooms to cut pipe runs.

Where Should the Outdoor Unit Go?

Put the outdoor unit where air can flow freely, close to the plant room to keep pipe runs short, and away from bedroom windows and neighbouring homes. On a new build the unit’s position normally appears on the planning drawings, so fix it early. Permitted development rules for existing homes in England were relaxed on 29 May 2025, but for a new build your planning permission is what counts.

What Does a Typical New Build Heat Pump Specification Look Like?

A typical new build heat pump specification is an air source heat pump feeding underfloor heating or large radiators at a low flow temperature, an unvented cylinder, and solar PV on the roof. Ground source suits plots with land for a ground array.

A well-insulated new home loses heat slowly, so the heat pump is often smaller than one serving an older home of the same size.

Should You Fit a Heat Pump Now Even if the Rules Do Not Force You?

For most new homes, yes, because fitting a heat pump at build stage costs far less than retrofitting later and matches where the rules are heading in every UK nation. Retrofitting a heat pump into a home designed around a combi boiler means new emitters, new pipework and finding cylinder space you did not plan for.

You also avoid the gas standing charge. Under the Ofgem price cap for 1 October to 31 December 2026, that charge is 29.68p a day for direct debit customers, roughly £108 a year before you use any gas. A home with a heat pump and solar panels needs only an electricity supply.

If you are planning a self-build or buying off plan, ask early which Part L version the home is registered under and what heating is specified. If you would like a heat loss calculation and heat pump design for your new build, our team can arrange a survey and quote.