Heat Pumps in New Builds

Heat Pumps in New Builds: The Easiest Install You'll Find

If you've bought or are buying a new-build home, you're in the best possible position for a heat pump. Modern homes are built to current Building Regulations, which means they're already well-insulated, often have underfloor heating, and increasingly come with a heat pump fitted as standard. If yours didn't, adding one is straightforward and relatively cheap.

Why New Builds Are Perfect for Heat Pumps

Everything that makes heat pumps expensive or complicated in older houses simply isn't a problem in a new build:

• Insulation is already done: new builds meet Part L Building Regulations, which require high levels of wall, floor, and roof insulation. Your annual heat loss is typically 4,000–7,000 kWh, compared to 12,000–20,000 kWh for an older uninsulated home.
• Radiators are already sized correctly: if the house was designed for a heat pump, the radiators (or underfloor heating) are spec'd for low-temperature operation. If it was designed for a gas boiler, the radiators are still likely large enough because modern build regs require lower heat output per room.
• The smallest heat pump does the job: a 4–6kW unit handles most new builds comfortably. That's the cheapest bracket to buy and the cheapest to run.
• Airtightness is built in: modern homes have proper draught-proofing and MVHR (mechanical ventilation with heat recovery) in better-spec builds. No draughty floorboards or leaky sash windows to deal with.

In short: a new build with a heat pump is how heating is supposed to work. Low demand, small system, low running costs.

Does Your New Build Already Have One?

Here's where the timing actually sits, because a lot of pages (including an earlier version of this one) get it wrong. The Future Homes and Buildings Standards are being brought in by The Building Regulations etc. (Amendment) (England) Regulations 2026, which come into force on 24 March 2027, and 24 September 2027 for higher-risk buildings. Work notified before 24 March 2027 and started before 24 March 2028 stays under the old rules, so gas-boilered new builds will keep completing for a while yet.

What the standard does, in the government's own words, is make sure new homes "are built with low carbon heating and high levels of energy efficiency, so that buildings constructed to these standards will not require retrofitting to become zero carbon in use". It also adds a brand new requirement (L3) for on-site renewable electricity generation on new dwellings, which in practice means solar. The government hasn't published a headline percentage for the emissions cut in the final version, so don't trust anyone who quotes you one.

In practice, most new builds coming to market now either have a heat pump or are "heat pump ready": pre-wired, pre-plumbed, with the space allocated.

If you're buying off-plan or from a developer, check what heating system is included. The three scenarios:

• Heat pump already fitted: increasingly common, especially from larger developers. You're sorted. Just make sure you understand how to use it (many people don't, and the handover from developers is often rubbish).
• "Heat pump ready": the infrastructure is in place, but you need to buy and install the unit. This is cheaper than a full retrofit because the pipework, cylinder space and electrical supply are already done. Nobody publishes a figure for this job specifically, so get it quoted rather than budgeting off a number you read online. Check the grant position first, too, because a house that never had a fossil fuel boiler doesn't qualify for the Boiler Upgrade Scheme.
• Gas boiler fitted: still happens in homes built before the new regulations bite. You've got a working system but may want to switch later. The good news is your house is already well-insulated, so when you do switch, it's a straightforward swap.

Costs: The Cheapest Heat Pump Install Going

Those are the same numbers as any other house, because the kit is the same, and the Energy Saving Trust puts a typical air source install at around £12,000. A full retrofit into a new build with no prep at all lands in the same range, because there's still nothing to insulate or upsize. What makes a new build cheap is the absence of everything else: no insulation to do, no radiators to upsize, no solid walls to argue about. The £7,500 grant then covers most of what's left. The eligibility rules are where new builds come unstuck, so read the next bit carefully.

The Grant Catch: BUS Eligibility for New Builds

Here's the important bit, and it's blunter than most sites admit. gov.uk says in terms that you cannot get a Boiler Upgrade Scheme grant for "most new build properties". On top of that, the scheme requires you to be replacing a fossil fuel heating system, which gov.uk lists as "oil, gas, electric or LPG".

You do qualify if:

• You've moved into a finished new build that has a fossil fuel boiler and you're replacing it with a heat pump. gov.uk: "If you move into a finished new build with a fossil fuel boiler, you may be able to get a grant for a heat pump under the scheme."
• You own the property. No EPC is needed and there's no insulation prerequisite: both requirements were removed, and gov.uk explicitly says you're still eligible if you've already had funding to insulate.
• The installation is done by an MCS-certified installer, and Ofgem won't accept an application for a system commissioned more than 120 days before it. The voucher itself then expires three months after issue.

You don't qualify if:

• The home was built with a heat pump already. There's nothing to replace.
• The developer is still building it. gov.uk: "New build properties which the developer is still building are not eligible."
• It's social housing, or the property has already had government funding for a heat pump.

Self builds are their own case, and they are eligible, provided you or the original owner built it and it's never been owned by a business or organisation.

This matters when you're buying. If you're choosing between two new-build specs, one with a gas boiler and one with a heat pump, the gas boiler version can work out cheaper overall because you may be able to claim the grant when you switch later. It's counterintuitive, and it only holds while new builds are still completing with gas boilers, which the Future Homes Standard ends for anything notified from 24 March 2027. Run the numbers rather than assuming either way.

Running Costs: As Low As It Gets

A new-build home with a heat pump is the cheapest type of home to heat in the UK. The numbers:

Those are annual figures for heating and hot water, worked from the current cap: 26.32p a unit for electricity, 7.97p for gas, and £108 a year of gas standing charge added to the boiler column. We've used a SCOP of 4.0 rather than the 3.5 we use elsewhere on this site, because a new build designed around low flow temperatures genuinely runs better than a retrofit does. That's the same figure the calculator at the top of this page is set to.

The heat pump wins on every row, by £230 to £330 a year. Worth saying plainly, because it's recent: this flipped in October 2026. Under the July cap gas was the cheaper fuel and plenty of new-build owners were told as much. Break-even against a 90% gas boiler is now a SCOP of 2.97, and a new build clears that comfortably.

Add a smart thermostat with weather compensation and the running costs drop further. The system learns your home's thermal behaviour and adjusts output to match. In a well-insulated new build, this really does make a noticeable difference.

Common Issues in New Builds with Heat Pumps

It's not all plain sailing. New-build heat pump installations have some recurring issues that are worth knowing about:

• Poor developer handover: most developers spend about 30 seconds explaining the heating system. Many new-build owners don't know how to use their heat pump properly, run it like a gas boiler (cranking it up and down), and wonder why it's expensive. Heat pumps work best running at a steady, lower temperature. Ask for a proper handover or read the manual.
• Undersized systems: some developers cut costs by fitting the smallest heat pump possible. If your home is slow to warm up or the hot water runs out quickly, the system may be undersized. Get an independent MCS engineer to check.
• Default settings aren't optimised: most heat pumps ship with factory settings that work but aren't optimal. An afternoon spent on the weather compensation curve, the flow temperature and the hot water schedule is genuinely worth it. We're not going to put a percentage on the saving, because nobody publishes a credible one, but every degree you take off the flow temperature is money.
• Noise from cheap outdoor units: developers sometimes fit budget models. They'll work fine but may be louder than premium alternatives. Not usually a problem in a new-build estate where everyone's in the same boat, but worth checking if your unit is near a bedroom window.

Should You Add Solar Panels?

In a word: yes, if you can afford it. A new build with a heat pump and solar panels is about as energy-efficient as a UK home gets. Your roof is new, unshaded (usually), and designed to modern standards, ideal for panels.

A 3 to 4 kWp system (8 to 11 panels) on a new-build roof costs roughly £5,100 to £6,800 installed, scaled from the Energy Saving Trust's figure of around £7,600 for a typical 4.5 kWp system. It generates around 2,850 to 3,800 kWh a year at the 950 kWh per kWp UK average, which is more than the heat pump uses across a whole year, though not at the time of year you need it most. On sunny days in spring and summer, your heating and hot water can be effectively free.

Some developers offer solar as an upgrade option. It's almost always cheaper to add it during the build than to retrofit later, so if the option is there, take it seriously. From 24 March 2027 it stops being optional anyway: the new L3 requirement makes on-site renewable electricity generation a condition of erecting a new dwelling in England.

Getting Started

• If buying off-plan: ask the developer what heating system is included, whether it's "heat pump ready", and whether solar panels are an option. Get it in writing.
• If your new build has a gas boiler: you're well-placed for a future switch. The house is already insulated, so when the time comes, the install is quick and affordable. Check BUS grant eligibility.
• If your new build has a heat pump: learn how to use it properly. Set it to run at a steady low temperature rather than boosting and turning off. Check the manufacturer's app for monitoring and optimisation.
• Consider a smart thermostat: weather compensation makes a real difference in a new build. See our smart thermostat guide for what works with heat pumps.

More reading: Heat pump costs explained | Heat pump running costs | Solar panel costs UK | Are heat pumps worth it?