Does a heat pump improve your rental's EPC rating?

The direct answer

A heat pump can lift an EPC band, but it is not guaranteed and the amount is not predictable from the technology alone. The reason is how the certificate is built. Today’s EPC is calculated from a model of the home, the heating system and fuel costs, and the government’s own description of the current approach is a single cost metric.

Two things follow. A poor fabric holds the score down however good the heating is. And because electricity costs more per unit than gas, a cost based score does not give a heat pump full credit for its efficiency. The government says this openly, and it is the reason the EPC is being rebuilt.

We publish this guide and do not assess properties. For your own home, the numbers on your certificate and its recommendations are the authority.

How the EPC you hold today is built

An EPC for an existing home is produced by an accredited domestic energy assessor using RdSAP, which stands for Reduced data Standard Assessment Procedure. GOV.UK explains that RdSAP was introduced in 2005 as a simpler, lower cost way to assess existing dwellings, using assumptions about the dwelling to reduce the data an assessor collects. The current version listed on GOV.UK is RdSAP 10.0.1.

RdSAP 10 replaced the older RdSAP 2012 on 15 June 2025, and the government’s impact assessment says all domestic EPCs lodged for existing homes since then must use it. The changes it lists include assessors always measuring windows rather than using default equations, a new heating regime assumption taken from SAP 10.2, and revised U-values for some solid brick walls.

The government describes the existing EPC as based on a single cost metric. The result is the Energy Efficiency Rating, a score that maps to bands A to G. In the government’s phrase, that cost element can penalise electric heating relative to fossil fuel heating.

That is the key to the question. On a cost based score, what matters is the modelled annual energy cost for the home, given the fuel prices used in the method. For comparison, the Ofgem price cap for 1 October to 31 December 2026 is 26.32p per kWh for electricity and 7.97p per kWh for gas. A heat pump delivers more than one unit of heat per unit of electricity, but the price gap works against it in a cost based comparison.

Why fabric performance comes first

The fabric of a home sets how much heat it needs. Insulation and glazing reduce that need, and the heating system only supplies what is left. Three consequences:

• A poor fabric limits the score gain from any heating change. A leaky house stays costly to heat on any system.
• A well sized heat pump needs the fabric in order. Insulate first, and the unit that suits the house may be smaller.
• The planned law follows the same logic. The government response for rented homes says landlords must first invest towards a fabric performance standard and only then work towards a second standard.

The planned fabric metric is built on a Fabric Energy Efficiency approach that estimates space heating demand, with system type taken out of the picture. In plain terms, it measures the building, not the boiler or heat pump. That is why a heat pump alone cannot satisfy it.

The new EPC: four metrics, not one

The government has decided to replace the single cost metric on domestic EPCs with four headline metrics:

Metric	What it is meant to show
Energy cost	Predicted annual energy bills, shown in pounds rather than as a band
Fabric performance	How well the building keeps heat in, independent of the heating system
Heating system	The efficiency and carbon impact of the heating and hot water system
Smart readiness	The ability to generate energy, for example from solar, and to use smart controls and time of use tariffs

There will also be two secondary metrics, one for energy demand and one carbon based. Existing EPCs keep their ten year validity until they expire.

The Home Energy Model, a new calculation method, underpins the new certificates. A consultation on the HEM based metrics ran from 21 January to 18 March 2026. The consultation proposes that the heating system metric is carbon based and that a home relying on a fossil fuel primary heating system should not be able to achieve a C on it. It also states that heat pumps, described as high efficiency and low carbon systems, would always score a C and above on that metric.

Read that carefully. It is a proposal from a closed consultation. At the time of reading, the GOV.UK page had no published outcome, and the government had said conclusions would follow later in 2026. The launch date has moved from October 2026 to the second half of 2027. We cannot tell you the final bands, the thresholds or the weightings, and neither can anyone else yet.

When a heat pump moves the band, and when it does not

Based on how the method works, the heat pump is more likely to help the certificate when:

• the fabric is already decent, so heat demand is moderate
• the existing heating is electric resistance or an old, inefficient system
• the property relies on oil or LPG, which are costlier and higher carbon than gas
• the system is recorded accurately by the assessor, with evidence of the model

It is less likely to help, or may even lower the cost based score, when:

• the fabric is poor and unimproved
• the replaced system is an efficient mains gas boiler and the score is mostly a cost comparison
• the assessor cannot see documentation for the system, so the entry may rest on assumptions

This is reasoning from the method, not a measured result. We have not found an official figure for the average band change from fitting a heat pump to a rented home, so we do not give one. A modelled running cost comparison is on the running costs page.

What this means if you still have a working gas boiler

If your rented home has a working gas boiler, there is no official reason today to replace it for the sake of the certificate. The planned EPC C rule treats a heat pump as one route to the second step, not a requirement, and the government response says landlords will never be required to replace a working heating system with a heat pump. Under the proposed new heating metric a gas boiler would not reach a C, which is why the smart readiness route exists as the alternative. Until the new EPCs launch, the sensible approach is to improve the fabric, keep the boiler running, and plan the heating change for the point when the boiler needs replacing.

What to do before you spend anything

1. Pull the current certificate. Use the GOV.UK Find an energy certificate service, and note the band, score, date and recommendations.
2. Read the recommendations as a list of fabric and heating options. They show which measure the assessor expects to move the score.
3. Work out the cheapest route to the planned EPC C line. Often it is loft insulation, draught proofing or wall insulation before any heating change.
4. Treat the heating decision on its own merits. Is the boiler near the end of its life? Is there outdoor space? What will the tenant pay to run it?
5. Order a fresh EPC only when the work is done and you need to show the result. Under the planned rules the cost of EPCs counts towards the cap.

If the question is whether it is worth it, start with is a heat pump worth it for landlords. If the question is the planned rule, read EPC C by 2030 and your heating choice and the cost cap and exemptions.

When a heat pump is the wrong answer for the EPC

If your goal is only to reach a band, a heat pump is often not the first or cheapest step. The planned standard looks at the fabric first, and a fabric measure is usually cheaper than a £12,000 heat pump (the Energy Saving Trust gives “around £12,000” before grant, updated 23 September 2026). A grant can reduce that, as the Boiler Upgrade Scheme pays £7,500 for an air-to-water or ground source heat pump where the property qualifies, but the remainder is still a large spend for a score effect that is currently uncertain.

A heat pump is the right answer when the home needs a new heating system anyway and the fabric is sound. In that case the certificate effect is a bonus, not the reason.

What we could not verify

For completeness, these are the points we looked for and could not confirm on an official source:

• a published average EPC points change from a heat pump install in a rented home
• the final band thresholds for the new heating system and fabric metrics
• the final launch date, beyond the stated move to the second half of 2027

Where the position is unsettled, we say so rather than guess. Check the GOV.UK pages on energy performance of buildings and the Home Energy Model for updates.

Next step

Run your own numbers in the landlord calculator, which models cost and running cost from the inputs you give it. If you want independent firms to assess a particular property, send an enquiry on the quote page: relevant firms contact you, with no charge to you and no obligation.