Heat Pump vs Gas Boiler for New Build UK
If you are building or buying a new home in the UK in 2026, the choice between a heat pump and a gas boiler is no longer a simple preference. Building regulations have changed, and the decision is now heavily influenced by law rather than personal choice. This article compares the costs, efficiency, and emissions of both systems specifically for new build properties.
Heat pumps can save you £200–£400 a year on heating bills compared to a gas boiler in a new build home, but they cost £7,000–£13,000 more upfront. However, from 2026, gas boilers are effectively banned in new builds in England under the Future Homes Standard, making heat pumps the only permitted option.
Quick numbers cost, efficiency, and emissions comparison for a new build
| Heating system type | Installation cost (new build) | Annual running cost | Efficiency (SCOP/%) | CO₂ emissions per year | Lifespan |
|---|---|---|---|---|---|
| Air source heat pump | £7,000–£13,000 | £400–£600 | SCOP 3.5–4.0 | ~1.2 tonnes | 15–20 years |
| Ground source heat pump | £14,000–£19,000 | £350–£500 | SCOP 4.0–4.5 | ~1.0 tonnes | 20–25 years |
| Gas boiler (condensing) | £1,500–£2,500 | £650–£850 | 90–94% | ~2.5 tonnes | 10–15 years |
Figures for SCOP (Seasonal Coefficient of Performance, the average efficiency of a heat pump over a year) come from the Microgeneration Certification Scheme (MCS, 2026). CO₂ emissions are based on Department for Energy Security and Net Zero emissions factors (DESNZ, 2026). Running costs are sourced from the Energy Saving Trust (EST, 2026), assuming a typical 3-bedroom new build with good insulation.
The Future Homes Standard 2025 (now in effect from 2026) bans gas boilers in new builds
From 2026, all new build homes in England must meet the Future Homes Standard, which effectively requires low-carbon heating. Gas boilers are no longer permitted in new builds under this regulation (GOV.UK, 2026). The standard sets a target for energy use: new homes must produce 75–80% less CO₂ than under previous regulations (GOV.UK, 2026).
This means that for any new build started after 2026, a heat pump (or other low-carbon system like a heat network) is mandatory, not optional. If you are buying a new build, the developer will have already chosen the heat pump. For self-builds, you must design for a heat pump from the start. Gas is not an option unless you build outside England, where Wales, Scotland, and Northern Ireland have separate building regulations.
Running costs heat pumps are cheaper per kWh than gas boilers in new builds
A heat pump’s efficiency (SCOP of 3.5–4.0) means it delivers 3.5–4 kWh of heat for every 1 kWh of electricity, versus a gas boiler’s 0.9 kWh from 1 kWh of gas. Using typical 2026 unit rates from Ofgem (Ofgem, 2026) of 24p/kWh for electricity and 6p/kWh for gas, the cost per kWh of heat works out as follows:
- Heat pump cost per kWh of heat = 24p ÷ 3.5 = 6.9p
- Gas boiler cost per kWh of heat = 6p ÷ 0.9 = 6.7p
At a SCOP of 3.5, running costs are very similar. However, with a higher SCOP of 4.0 (common in well-insulated new builds with underfloor heating), the heat pump cost drops to 6.0p per kWh. That makes it cheaper. New builds with underfloor heating, which operates at lower flow temperatures, boost heat pump efficiency further (EST, 2026).
Installation costs heat pumps cost £7,000–£13,000 more upfront than a gas boiler in a new build
A gas boiler for a new build costs £1,500–£2,500 (including flue and controls), while an air source heat pump costs £7,000–£13,000 installed by an MCS-registered installer (EST, 2026). Ground source heat pumps cost £14,000–£19,000, but their higher upfront cost can be offset by lower running costs and longer lifespan.
For a new build, the heat pump is part of the total build cost. There are no retrofitting costs, and the builder may include it in the mortgage. This means the upfront difference is less painful than retrofitting a heat pump into an existing home. heat pump installation costs for new builds
The Boiler Upgrade Scheme (BUS) gives you £7,500 off a heat pump in 2026
The UK government’s Boiler Upgrade Scheme provides a grant of £7,500 for an air source heat pump (or ground source) installed in an existing home (GOV.UK, 2026). However, this grant is NOT available for new builds. Because the heat pump is already required by building regulations, the cost is absorbed into the build budget.
If you are buying a new build, ask the developer if the heat pump is included in the price. It should be, as it is mandatory. For self-builds, you will need to budget for the full installation cost without the BUS grant. Boiler Upgrade Scheme eligibility for new builds
Eligibility and certification only MCS-registered installers can certify a heat pump for new builds
For a new build, the heat pump must be installed by an MCS (Microgeneration Certification Scheme) accredited installer to comply with building regulations (MCS, 2026). This certification is required for warranty and regulatory compliance. Gas boilers require Gas Safe Register certification (Gas Safe Register, 2026); heat pumps do not. However, the electrical work must be done by a NICEIC or NAPIT registered electrician.
Always check the installer’s MCS number on the MCS website before signing a contract. This is required for warranty and regulatory compliance. For self-builds, ensure your installer is MCS-registered to avoid delays in building control sign-off.
The direct answer for a new build in 2026, you cannot choose a gas boiler, heat pumps are the only option
The Future Homes Standard makes gas boilers illegal in new builds from 2026, so the decision is made for you: you must install a heat pump (GOV.UK, 2026). If you are buying a new build, the developer will have already chosen the heat pump. You cannot opt for a gas boiler.
For self-builds, you must design for a heat pump (or another low-carbon system like a heat network) from the start. Gas is not an option unless you build outside England, where Wales, Scotland, and Northern Ireland have separate building regulations. In those nations, check local building standards before proceeding. heat pump vs gas boiler running costs comparison
Frequently Asked Questions
Yes. According to the Energy Saving Trust, a heat pump costs £400-£600 per year to run in a new build, compared to £650-£850 for a gas boiler, saving £200-£400 annually.
No. The Future Homes Standard, enforced by GOV.UK from 2026, bans gas boilers in all new build homes in England. Low-carbon heating like heat pumps is now mandatory.
An air source heat pump costs £7,000-£13,000 for a new build, while a ground source heat pump costs £14,000-£19,000. These figures come from MCS certified installer data (2026).
Heat pumps last 15-25 years (air source 15-20, ground source 20-25), while gas boilers last 10-15 years, according to MCS and industry standards.
Yes. Heat pumps have a SCOP of 3.5-4.5, meaning they deliver 3.5-4.5 units of heat per unit of electricity. Gas boilers are 90-94% efficient, per MCS data (2026).
Yes. A heat pump produces ~1.0-1.2 tonnes of CO₂ per year, compared to ~2.5 tonnes for a gas boiler, based on DESNZ emissions factors (2026).
