Heat Pumps & Low-Carbon Heating: EPC points and cost

Does a heat pump improve your EPC score? The honest answer

Usually yes, an air source heat pump typically adds somewhere in the region of +10 to +20 SAP points on a home currently running on old fossil-fuel or electric heating. It is also the single measure that most clearly satisfies the proposed future “heating system” metric that will sit inside the reformed EPC. But there is a genuine catch that most installers will not volunteer, and this page leads with it rather than burying it: under the current SAP cost metric, a heat pump does not always lift the EPC as far as owners expect, and in some cases the uplift is smaller than the marketing implies.

Here is why. A domestic EPC is not a carbon score and it is not a meter reading, it is a SAP rating from 1 to 100 that models the annual cost of heating, hot water, lighting and ventilation per square metre of floor area (source: the Standard Assessment Procedure guidance on GOV.UK). Because it is cost-weighted, and because electricity currently costs several times more per unit than mains gas, a heat pump running on electricity can be modelled as more expensive to run than a modern gas boiler even though it uses far less energy overall and emits far less carbon. On a home coming off oil, LPG, coal or old electric heating the uplift is usually strong and obvious. On a home swapping a reasonably modern gas combi for a heat pump, the score can move less than the £8,000-plus price tag suggests, and occasionally it barely moves at all.

That is not a reason to avoid a heat pump. It is a reason to get the position modelled for your property before you spend, rather than trusting a blanket “+15 points” promise. The number depends on your current heating fuel, your fabric, your floor area and the electricity-to-gas price ratio baked into the current SAP methodology.

The SAP cost-metric quirk, and why it is about to change

This electricity-cost weighting is a known quirk of the current methodology, and the government has proposed to fix it. The partial government response to the EPB-regime reform consultation, published 9 March 2026 (STATUS: partial response / proposal, on GOV.UK) sets out that domestic EPCs will move away from a single cost metric to four headline metrics, energy cost, fabric performance, heating system and smart readiness, produced with the Home Energy Model replacing SAP/RdSAP. Under a dedicated heating-system metric, a low-carbon heat pump is expected to score on its own merits rather than being dragged down by the price of electricity.

Be clear on the status: the reformed metrics are a PROPOSAL, targeted from October 2026 subject to the 2026 regulations (STATUS: proposal, targeted date, timing reported as possibly slipping into 2027; check GOV.UK). It is not law today. So the honest planning position is: on today’s cost-based SAP your heat pump uplift may be modest if you are coming off gas; under the reformed metrics it should score more favourably; and either way you should model the specific number for your home rather than assume. You can read the partial government response on EPC reform (March 2026) in full on GOV.UK.

What a heat pump costs, and the cost per point verdict

A domestic air source heat pump typically costs £8,000 to £15,000 gross, depending on the size of the property, the heat-loss calculation, the number of radiators that need upsizing and whether a hot-water cylinder has to be added. Ground source systems cost more again because of the ground loop or borehole.

The number that changes everything is the £7,500 Boiler Upgrade Scheme grant, which comes straight off the installed cost in England and Wales. After the grant, a typical net spend lands somewhere between £500 and £7,500, and at that point the cost-per-point maths looks very different.

• Gross, before the grant: at £8,000-£15,000 for +10 to +20 points, a heat pump can work out at several hundred pounds per point, poor value against a £25 cylinder jacket or a £450 loft top-up.
• Net, after the £7,500 grant: at £500-£7,500 for the same points, and with the running-cost and carbon benefits on top, it becomes one of the stronger big-ticket measures, and unlike anything else on the certificate, it is the measure that clears the future heating-system standard outright.

So the verdict is conditional, and we will not pretend otherwise: a heat pump is rarely the cheapest first point on your EPC, but after the grant it is genuinely good value for the last points and for future-proofing your heating. If your goal is simply to nudge a mid-D home over the 69-point band C threshold for the least money, the quick wins and insulation get you there far more cheaply. If your goal is a low-carbon home that clears both today’s rules and the reformed heating metric, a grant-funded heat pump is the measure that does it. For the full ranking of every measure by cost per point, see our cost per point breakdown.

For comparison across the other big levers, our heating, boilers and controls guide covers the cheaper condensing-boiler and controls route, and our solar PV and EPC guide covers the other low-carbon measure owners most often ask about.

Who a heat pump is right for

A heat pump earns its place on the EPC, and its grant, most clearly for these owners:

• Off-gas-grid homes. If you heat with oil, LPG, coal or old electric heaters, the current SAP cost metric works in your favour: those fuels are modelled as expensive, so switching to a heat pump usually produces a strong, visible score jump. This is where a heat pump most reliably lifts an EPC.
• Homes already reasonably well insulated. A heat pump runs efficiently, and scores best, in a home with a decent fabric. Loft insulation, draught-proofing and cavity fill first means a smaller, cheaper unit and a better result.
• Landlords planning for 2030. Privately rented homes in England and Wales face a confirmed EPC C by 1 October 2030 standard, measured across two of the reformed metrics including a heating-system metric (STATUS: confirmed government policy, 21 January 2026, awaiting secondary legislation reported as targeted for 2027). A heat pump is the measure that most clearly satisfies that heating-system component. For the compliance detail, see our landlord and MEES context.
• Owners who want lower carbon and lower long-run bills and are prepared for a higher-disruption install.

It is a High-disruption measure, expect radiator changes, possible pipework upsizing, a hot-water cylinder if you currently have a combi, and outdoor unit siting, so it is a considered upgrade, not a quick weekend fix.

RdSAP 10 evidence: what the assessor needs to see

Since 15 June 2025 (STATUS: in force), domestic assessments use RdSAP 10, which is evidence-based: the assessor scores your heating from documented data, not assumptions. For a heat pump that means the paperwork is worth points, and missing paperwork can cost them.

Have ready:

• The MCS certificate for the heat pump installation, this is the primary evidence document, and it is also non-negotiable for the grant.
• The manufacturer make, model and serial number so the assessor can score the actual unit’s efficiency (its seasonal coefficient of performance) rather than defaulting to a pessimistic assumption.
• The commissioning and installation invoices.
• If you have added battery storage alongside, its details too, batteries are now recorded under RdSAP 10.

Under RdSAP 10 an unevidenced heating system is scored on default assumptions that are usually worse than reality, so keep every document from the install in one place for your re-assessment.

Grants: the £7,500 Boiler Upgrade Scheme and 0% VAT

Two genuine, dated supports make a heat pump viable in this niche.

The Boiler Upgrade Scheme (BUS) pays £7,500 toward an air or ground source heat pump in England and Wales, and landlords are eligible (STATUS: open). The Warm Homes Plan allocates funding to the scheme through 2029/30 (STATUS: reported, £2.687bn through 2029/30, confirm current on GOV.UK). Two conditions matter for your EPC plan:

1. The installer must be MCS-certified, the grant cannot be claimed otherwise.
2. You need a valid EPC with no outstanding loft or cavity wall insulation recommendations (unless those measures are technically unsuitable). In other words, the cheap fabric measures are literally a precondition of the grant, which happens to be exactly the sequencing we recommend anyway: cheap points first, heat pump after.

A government announcement in 2026 introduced a temporary higher grant for oil and LPG-heated homes (STATUS: announced 2026, reported effective from 21 July 2026 to end March 2027, confirm the current value on GOV.UK). Treat £7,500 as the dependable figure and check GOV.UK for the current uplift. You can apply and read the full terms via the Boiler Upgrade Scheme (£7,500 heat pump grant) page.

0% VAT on energy-saving materials applies to heat pumps installed in residential accommodation in Great Britain until 31 March 2027, after which it reverts to 5% (STATUS: law, VAT Notice 708/6). That is a real, dated reason to act before the window closes rather than wait. Full detail on our grants and funding page.

When a heat pump is the WRONG first move

Being straight about this is the point of the page. A heat pump is the wrong first move when:

• You still have a modern gas boiler and simply want a band jump for the least money. On the current cost-based SAP, swapping gas for a heat pump can move the score surprisingly little because of the electricity-cost weighting, so you could spend thousands for a modest uplift. Quick wins, loft insulation and controls will lift the number far more cheaply. Start with our cheapest EPC improvements.
• Your fabric is poor. Fitting a heat pump into a draughty, under-insulated home means an oversized, more expensive unit that runs less efficiently and scores worse. Insulate first, see our insulation guide, then the heat pump is smaller, cheaper and higher-scoring.
• You have outstanding loft or cavity recommendations on your EPC. You cannot claim the grant until those are addressed (or shown unsuitable), so the fabric work has to come first regardless.
• You are a leaseholder in a flat without freeholder consent, or in a listed building where permitted-development rights do not apply.

The right sequence is almost always the same: cheapest points first, fabric second, and a grant-funded heat pump as the measure that both finishes the score and future-proofs the heating. When you are ready to model the specific numbers for your property, start from your current rating on the homepage or check it free via the national EPC register.

Frequently asked questions

Does a heat pump always raise my EPC score?

Not always by as much as you might expect. On the current cost-based SAP metric the uplift is strong for homes coming off oil, LPG or old electric heating, but can be modest for a home swapping a modern gas boiler, because electricity is modelled as more expensive per unit than gas. The government’s 9 March 2026 partial response proposes a dedicated heating-system metric under which a heat pump should score on its own merits (STATUS: proposal, targeted from October 2026, not law). The honest answer is to model the number for your specific property rather than rely on a blanket figure.

How much does a heat pump cost after the grant?

Gross costs are typically £8,000 to £15,000. The £7,500 Boiler Upgrade Scheme grant comes straight off in England and Wales, so a typical net cost lands between roughly £500 and £7,500 (STATUS: BUS open; £7,500 the dependable figure, confirm on GOV.UK). Heat pumps also qualify for 0% VAT until 31 March 2027 (STATUS: law), after which VAT reverts to 5%.

Do I need insulation before a heat pump?

For the grant, effectively yes, the Boiler Upgrade Scheme requires a valid EPC with no outstanding loft or cavity wall insulation recommendations unless those measures are technically unsuitable. Practically, yes too: a well-insulated home needs a smaller, cheaper heat pump that runs more efficiently and scores better. Fabric first is both the grant condition and the smart order.

Will a heat pump help me meet the 2030 landlord standard?

It is the measure that most clearly satisfies the proposed heating-system metric within the confirmed EPC C by 1 October 2030 standard for privately rented homes, which is measured across two of the reformed metrics (STATUS: confirmed government policy, 21 January 2026, awaiting secondary legislation reported for 2027). It is not the only route, fabric and controls also count, but it is the strongest single move on the heating side. Plan it against the rule that applies to your building, not a headline.