Best Ground Source Heat Pump Grants UK

Switching from a fossil fuel boiler to a ground source heat pump (GSHP) is one of the most effective ways UK homeowners can reduce carbon emissions and lower long-term energy costs. While the benefits are significant, the upfront installation cost can range from £14,000 to £35,000, depending on your property’s size, land, and ground conditions. Fortunately, Ground Source Heat Pump Grants UK schemes are available to help make these energy-efficient systems more affordable through government funding and incentives.

In this comprehensive guide to Ground Source Heat Pump Grants UK, you’ll learn about the latest grants available, eligibility requirements, funding amounts, and the step-by-step application process. Whether you’re replacing an old boiler or planning an energy-efficient home upgrade, this guide will help you understand how to qualify for financial support and reduce your installation costs.

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1. What Is a Ground Source Heat Pump, and Why Does It Need a Grant?

A ground source heat pump extracts stored solar energy from the ground through a network of buried pipes (known as a ground array) or a vertical borehole. Using a refrigerant cycle, it converts this low-grade heat into energy that warms your radiators, underfloor heating, and hot water cylinder. Because the ground maintains a relatively stable temperature throughout the year, ground source heat pumps generally operate more efficiently and consistently than air source systems, particularly during winter. If you’re considering installing one, Ground Source Heat Pump Grants UK can help reduce the upfront installation costs, making this renewable heating solution more affordable for eligible homeowners..

The trade-off is installation cost. Digging trenches or drilling a borehole is expensive, and the equipment itself is more specialised than a standard boiler or even an air source heat pump. Grant schemes exist specifically to close that affordability gap and accelerate the UK’s move away from gas and oil heating.

2. The Grant Landscape at a Glance

There is no single UK-wide grant. Instead, funding differs by nation:

England and Wales — the Boiler Upgrade Scheme (BUS), run by Ofgem on behalf of the Department for Energy Security and Net Zero (DESNZ), is the main route. It offers a flat £7,500 towards a ground source heat pump, with a temporary £9,000 rate for some off-grid oil and LPG homes.
Scotland — support comes through Home Energy Scotland (HES), funded by the Scottish Government. It combines a grant of up to £7,500 (rising to £9,000 with a rural/island uplift) with an optional 0% interest loan.
Northern Ireland — there is currently no direct equivalent to BUS for ground source heat pumps; support is more limited and tends to run through local energy efficiency schemes, so it’s worth checking with the NI Housing Executive or local council for the latest position.
England-only top-ups — the Warm Homes Local Grant, delivered through local authorities, can support wider energy efficiency and heating upgrades for lower-income and fuel-poor households, sometimes alongside a heat pump installation.
VAT relief — across the UK, heat pumps currently qualify for a reduced or zero rate of VAT on installation, which is applied automatically by your installer and isn’t something you need to apply for separately.

The rest of this guide covers each of these in detail, starting with the scheme most homeowners in England and Wales will use.

3. The Boiler Upgrade Scheme (England and Wales)

3.1 How Much You Can Get

The Boiler Upgrade Scheme offers a flat-rate grant of £7,500 towards the cost of installing a ground source heat pump (this also covers water source heat pumps and systems on a shared ground loop). The same £7,500 rate applies to air source heat pumps, while air-to-air heat pumps attract a smaller £2,500 grant and biomass boilers £5,000 in specific rural circumstances.

There is currently a temporary uplift: from 21 July 2026 to 31 March 2027, homes that are off the gas grid and currently heated by oil or LPG can claim £9,000 instead of £7,500 towards an air source or ground source heat pump. This uplift was designed to target the households facing the highest fuel costs and the biggest carbon savings from switching. If your home is on mains gas, the £9,000 rate does not apply — you’d claim the standard £7,500.

The grant is paid directly to your MCS-certified installer and deducted from your invoice, so you never have to find the money upfront and then wait to be reimbursed.

3.2 Who Is Eligible

To qualify for BUS, you generally need to:

Own a domestic property (including self-builds) or a small business premises in England or Wales.
Currently have a fossil fuel heating system (gas, oil, LPG, coal) or an all-electric system without a heat pump.
Not already have received a BUS grant for the same property.
Have — or be replacing with — a heating system with a capacity of up to 45kWth.
Install a system that is sized correctly for the property, based on a heat loss survey carried out by your installer.

Social housing and most new-build developments are excluded from BUS, though custom and self-build homes can apply. As of April 2026, a valid Energy Performance Certificate (EPC) is no longer a strict requirement for every application; where one isn’t available, installers can submit alternative evidence, which has removed a common source of delay for older or unusual properties.

3.3 Installer Requirements

You cannot apply for BUS yourself — your installer applies on your behalf, and the scheme is built around installer accreditation. Your installer must be:

MCS certified (Microgeneration Certification Scheme) for ground source heat pump installations specifically.
A member of an approved consumer protection code, such as the Renewable Energy Consumer Code (RECC) or the HIES Consumer Code.

This dual requirement exists to protect homeowners from poor workmanship and to make sure there’s a formal complaints route if something goes wrong.

3.4 How the Application Works, Step by Step

Get quotes from MCS-certified installers. Aim for at least two or three, since ground source systems vary a lot in price depending on ground conditions and array type (horizontal trench vs vertical borehole).
Request a heat loss survey. A reputable installer will calculate your property’s heat demand room-by-room, rather than guessing at a system size. This is required for MCS certification and protects you from an undersized or oversized (and therefore inefficient) system.
Agree a quote that shows the grant already deducted. Under BUS, the £7,500 (or £9,000) discount should appear directly on your installer’s quote, not as a separate reimbursement.
Your installer submits the application to Ofgem through the BUS online portal, including the EPC or alternative evidence, the MCS certificate, and the quote.
Ofgem reviews and issues a voucher. This typically takes a few weeks. The voucher confirms the grant amount and has an expiry date, usually around three months, within which the installation must be completed.
Installation takes place, including trenching or borehole drilling, pipework, the heat pump unit itself, and any necessary upgrades to radiators, pipework, or the hot water cylinder.
The installer redeems the voucher with Ofgem once the job is signed off and commissioned, and you pay the balance shown on your original quote (i.e., the total cost minus the grant).

Because the process is installer-led, the single biggest factor in a smooth application is choosing an experienced MCS-certified ground source installer who has done several BUS applications before — mistakes in paperwork are the most common cause of delay.

3.5 Budget and Timing Considerations

BUS is funded until 2028 as part of the wider Warm Homes Plan, and funding is allocated on an ongoing basis rather than through a fixed annual pot that can run out overnight, but demand has grown substantially — applications have risen sharply since the scheme launched in 2022. It’s sensible to start the process well ahead of any expiry dates for temporary top-ups (such as the July 2026–March 2027 £9,000 rate) if you want to be sure of qualifying at the higher rate.

4. Home Energy Scotland Grant and Loan (Scotland)

Scotland runs its own scheme, separate from BUS, delivered by Home Energy Scotland (HES) on behalf of the Scottish Government.

4.1 How Much You Can Get

A grant of up to £7,500 towards a new air source, ground source, or water source heat pump.
A rural and island uplift of an additional £1,500, taking the maximum grant to £9,000 for households in remote rural or island areas (defined using the Scottish Government’s Urban Rural Classification).
On top of the grant, an optional interest-free loan of up to £7,500 to cover remaining costs, repayable over as long as ten years.
Combined, a rural Scottish household could potentially access up to £16,500 in grant-plus-loan support towards a heat pump installation, and higher again if additional energy efficiency measures (like insulation) are bundled in.

4.2 Eligibility

Broad eligibility criteria include:

You must be a homeowner in Scotland — landlords and property developers cannot apply through this particular route.
The heat pump needs to be recommended either in your EPC or in a Home Energy Improvement Report produced by a Home Energy Scotland adviser following a home visit or assessment.
The heat pump must provide 100% of your home’s heating and hot water — hybrid systems that keep a fossil fuel boiler as backup are not eligible.
Your chosen installer and the specific product must meet the required certification standards (again, MCS accreditation is central to this).

4.3 How to Apply in Scotland

Contact Home Energy Scotland on 0808 808 2282 (free from mobiles and landlines) or via their website to start the process.
Complete an initial assessment over the phone, covering your property type, current heating system, and rough budget.
Arrange a home energy assessment, where an adviser visits (or arranges a survey) to check suitability for a ground source system — critically, whether you have enough land or access for a horizontal ground array, or the right conditions for a borehole.
Receive a report and funding offer, confirming the recommended measures and the exact grant and loan amounts you qualify for.
Get quotes from HES-registered, MCS-certified installers. If you’re applying for the loan element, you’ll need a formal installer quote to support the application — you can start the paperwork before you’ve chosen an installer and pick up the application again once you have one.
Confirm your application and schedule installation. Once approved, the grant is paid to reduce your installation cost, and any loan is arranged directly with you as a separate, interest-free repayment agreement.

4.4 Additional Scottish Support

Households on lower incomes, or receiving certain means-tested benefits, may also be eligible for Warmer Homes Scotland, which can fund a heat pump installation completely, with no grant repayment and no loan required. This is a distinct scheme from the standard HES Grant and Loan and is worth checking if your household income is around or below roughly £33,000, or if you receive relevant benefits — eligibility criteria are set and updated by the Scottish Government, so it’s worth confirming current thresholds directly with Home Energy Scotland.

The Energy Company Obligation (ECO4) scheme, funded by energy suppliers rather than government, can also support heat pump and insulation upgrades for eligible low-income and vulnerable households, and can sometimes be combined with HES funding.

5. Wales

Homeowners in Wales apply through the same Boiler Upgrade Scheme described in Section 3 — BUS is a joint England and Wales scheme administered by Ofgem, with identical grant amounts and eligibility rules. The Welsh Government also runs its own separate home energy efficiency schemes from time to time (such as the Nest scheme for low-income households), which can sometimes be layered with BUS funding for wider home upgrades, so it’s worth checking current Welsh Government programmes alongside your BUS application.

6. Warm Homes Local Grant (England)

Announced as part of the Warm Homes Plan, the Warm Homes Local Grant is delivered through individual local authorities in England rather than centrally through Ofgem. It’s aimed at lower-income and fuel-poor households and can fund a wider package of measures — insulation, smart heating controls, solar panels, and heat pumps — where a local authority assessment agrees the measures are suitable. Availability, exact criteria, and funding levels vary by council area, so the first step is to contact your local authority directly to find out whether the scheme is live in your area and what it can offer alongside, or instead of, BUS.

7. Northern Ireland

Northern Ireland does not currently have a direct equivalent of the Boiler Upgrade Scheme for ground source heat pumps. Support tends to be more localised, delivered through initiatives from the NI Housing Executive or individual council energy efficiency programmes, and is subject to change. If you’re in Northern Ireland, your best first step is to contact the NI Housing Executive or your local council’s energy team directly, since scheme availability shifts more often here than in the rest of the UK.

8. Preparing a Strong Application: Practical Tips

Get your EPC in order early. While it’s no longer an absolute requirement for BUS, having a recent, accurate EPC still speeds up the process and helps installers size your system correctly.

Choose an installer with genuine ground source experience, not just an MCS certification for air source systems. Ground works, borehole drilling, and ground loop design require specific expertise, and mistakes here are costly to fix after the fact. Ask to see previous ground source projects and, ideally, speak to a past customer.

Check your land or access before committing. Horizontal ground arrays need a reasonably large, accessible garden or plot; boreholes need drilling access and can require planning permission or environmental permits in some cases (particularly if you’re near a water source, in some cases from the relevant environment agency). Your installer should check this as part of the initial site survey.

Get more than one quote. Ground source costs vary significantly by installer and by ground conditions — a comparison protects you from overpaying and gives you a sense of what’s reasonable for your property.

Understand what’s included. Ask specifically whether the quote covers full excavation and reinstatement of your garden or driveway, upgraded radiators or underfloor heating if needed, a new hot water cylinder, and the electrical work required to power the unit. Ground source installations often involve more groundwork than homeowners initially expect.

Watch voucher expiry dates. Under BUS, once your installer’s application is approved and a voucher issued, installation typically needs to be completed within a set window (usually around three months). Make sure your installer’s schedule fits within that timeframe before you commit.

Ask about combining grants and 0% VAT. In Scotland, the grant can be paired with an interest-free loan; in England and Wales, the reduced VAT rate on heat pumps is applied automatically and stacks with the BUS grant, further lowering your net cost.

9. Common Mistakes to Avoid

Assuming the grant covers the full cost. Even at £7,500–£9,000, most ground source installations still require a substantial homeowner contribution — total system costs commonly range from roughly £14,000 to £35,000 depending on land, ground conditions, and property size.
Skipping the heat loss survey. An undersized system will struggle to keep the home warm in winter; an oversized one wastes money. A proper survey protects both comfort and running costs.
Using an installer who isn’t MCS certified for ground source specifically. Certification is scheme- and technology-specific, so double-check the installer’s MCS certificate explicitly covers ground source heat pumps.
Applying too late for a temporary uplift. If you’re hoping to catch the £9,000 off-grid rate in England and Wales, or a time-limited local scheme, build in enough lead time for surveys, quotes, and voucher approval.
Not checking land suitability first. Ground source systems have very specific site requirements. Confirm feasibility before spending time on detailed quotes.

Can I apply for the grant myself, or does it have to go through an installer?

For both BUS and the Home Energy Scotland scheme, the installer (or, in Scotland, Home Energy Scotland acting alongside your chosen installer) handles the formal grant application. You don’t submit paperwork to Ofgem yourself.

Is the grant means-tested?

No — BUS and the standard Home Energy Scotland Grant and Loan are not means-tested. Separate schemes such as Warmer Homes Scotland and ECO4 are targeted at lower-income or vulnerable households and do have income or benefit-based eligibility criteria.

Can landlords apply?

BUS is open to some non-domestic small business premises as well as homeowners, but general residential landlords have more limited eligibility, and rules can differ by scheme and nation. Always confirm your specific situation directly with the scheme administrator before proceeding.

Do I need to replace radiators as part of the switch?

Not always, but ground source heat pumps typically run at lower flow temperatures than a gas boiler, so larger radiators or underfloor heating are often recommended for the best efficiency. Your installer’s heat loss survey will confirm what’s needed for your home.

How long does the whole process take, from first enquiry to a working system?

This varies a lot by property and installer availability, but as a rough guide, allow several weeks for surveys and quotes, a further few weeks for grant approval, and then anywhere from a few days to a couple of weeks for the physical installation itself, depending on the complexity of the groundworks.

What happens if my BUS voucher expires before installation is finished?

If the work isn’t completed within the voucher’s validity window (typically around three months), the voucher lapses and your installer will need to submit a fresh application. This is why it’s important to only accept a voucher once you and your installer have a realistic, confirmed installation date.

Can I get a grant for a ground source heat pump in a new-build home?

Standard new-build developments are excluded from BUS, since building regulations already push new homes towards low-carbon heating. However, custom and self-build homes are treated differently and can apply, provided they meet the scheme’s other eligibility criteria.

Will a ground source heat pump grant affect my property’s Energy Performance Certificate rating?

Installing a ground source heat pump typically improves your EPC rating, since it replaces a fossil fuel system with a low-carbon one. This can be useful beyond the grant itself — a better EPC rating may support mortgage applications, property value, and eligibility for other future green home schemes.

Can I combine a ground source heat pump grant with solar panels or a battery grant?

In principle, yes. BUS itself only funds the heat pump (or biomass boiler), but nothing stops you from installing solar panels or a battery storage system alongside it, and separate incentives — such as the 0% VAT relief on solar and battery installations, or Warm Homes Local Grant support in England — can sometimes be combined with your heat pump project as part of a wider home upgrade.

What if my application is rejected — can I appeal or reapply?

Yes. If a BUS application is declined, your installer can usually identify the reason (commonly missing documentation, an eligibility issue, or an error in the submission) and correct and resubmit it. For Home Energy Scotland, you can contact your adviser directly to query a decision or ask what additional evidence might be needed.

11. Final Thoughts

Ground source heat pumps remain one of the most efficient low-carbon heating options for UK homes with the space to accommodate them, and the grant landscape — while split across different schemes for England, Wales, and Scotland — is currently more generous than it has ever been, particularly for off-grid households paying high oil or LPG costs. The practical route to funding is broadly the same everywhere: confirm your property is suitable, get quotes from properly certified installers, and let your installer (or Home Energy Scotland) handle the formal application on your behalf.

Because scheme details, funding levels, and deadlines do shift over time — as seen with the temporary £9,000 uplift introduced in mid-2026 — it’s worth checking the current rules directly on GOV.UK, Ofgem’s Boiler Upgrade Scheme pages, or the Home Energy Scotland website before you commit, to make sure you’re applying under the most up-to-date terms.

This guide reflects scheme details as understood in August 2026. Grant amounts, eligibility criteria, and deadlines are subject to change — always confirm current terms with Ofgem, Home Energy Scotland, or your local authority before applying.

Ground Source Heat Pump Grants UK: The Complete Application Guide (2026)