EPC Ratings Explained: What Your Rating Means for Grants
An EPC (Energy Performance Certificate) rates your home's energy efficiency on a scale from A (most efficient) to G (least efficient). The rating directly affects which government grants you can access. Most schemes, including ECO4 and GBIS, require a rating of D or below to qualify.
What Is an EPC?
An Energy Performance Certificate is a legal document that summarises how energy-efficient a property is. It includes an overall rating from A to G, estimated energy costs per year, and a list of recommended improvements ranked by cost-effectiveness. Every home in England, Wales, and Northern Ireland must have a valid EPC when sold, let, or built. Scotland uses a similar system with additional requirements for landlords.
The certificate is produced by a qualified Domestic Energy Assessor (DEA) who visits the property and records details such as wall construction, insulation levels, heating system type, window glazing, and lighting. The data is fed into the government's Standard Assessment Procedure (SAP) model, which calculates the rating.
What Each EPC Band Means
The table below shows the score range for each band, along with what it typically means for your home and energy bills.
| Band | SAP Score | What It Means |
|---|---|---|
| A | 92–100 | Extremely efficient, lowest energy bills |
| B | 81–91 | Very efficient, typical of new-builds |
| C | 69–80 | Above average, government target for all homes |
| D | 55–68 | Average UK home, eligible for most grants |
| E | 39–54 | Below average, minimum legal standard for rentals |
| F | 21–38 | Poor, high energy bills, strong grant eligibility |
| G | 1–20 | Very poor, urgent improvements recommended |
The average UK home currently sits in band D with a SAP score of around 60. The government's long-term target is for all homes to reach band C or above by 2035.
How Your EPC Rating Affects Grant Eligibility
Your EPC band is one of the first things checked when you apply for energy efficiency funding. The two largest schemes both target lower-rated properties:
ECO4
The Energy Company Obligation (ECO4) scheme funds insulation, heating upgrades, and renewable installations for low-income households. To qualify, your property generally needs an EPC rating of D, E, F, or G. The scheme aims to bring eligible homes up to at least band C where practical. Measures can include cavity wall insulation, loft insulation, and heat pump installations.
Great British Insulation Scheme (GBIS)
GBISfocuses specifically on insulation measures for homes in council tax bands A–D (England) or A–E (Scotland and Wales) with an EPC of D, E, F, or G. Unlike ECO4, GBIS has a "general eligibility" route that does not require you to be on benefits. Your property just needs to meet the EPC and council tax band criteria.
Boiler Upgrade Scheme
The Boiler Upgrade Scheme (BUS) provides up to £7,500 towards a heat pump installation. It does not require a specific EPC band, but you do need a valid EPC on record. Choosing one of the best heat pump brands for your property size will help maximise efficiency regardless of your current rating.
How to Improve Your EPC Rating
Improving your rating opens up grant eligibility and reduces your energy bills. The most cost-effective upgrades, roughly in order of impact, are:
- Loft insulation: topping up to 270 mm can improve your score by 5–10 points. Costs around £300–£500 for a typical semi-detached house.
- Cavity wall insulation: if your walls are unfilled, this is one of the single biggest improvements, worth up to 15 SAP points. Typical cost: £400–£700.
- Upgrading your boiler: replacing an old G-rated boiler with a modern condensing model can add 5–10 points.
- Double or triple glazing: replacing single-glazed windows improves both your score and comfort. Budget £3,000–£7,000 for a full house.
- Smart heating controls: a programmable thermostat and thermostatic radiator valves (TRVs) are low-cost additions that assessors look for.
- LED lighting: switching all bulbs to LED is cheap and contributes a few points.
Many of these measures can be funded through ECO4 or GBIS if you meet the eligibility criteria, meaning you may pay nothing at all.
How to Get an EPC
You can find a qualified Domestic Energy Assessor through the government's official EPC register or by searching for accredited assessors in your area. The process has three steps:
- Book an assessment with a DEA accredited by Elmhurst, Stroma, or another approved scheme.
- The assessor visits your property (typically 45–90 minutes) and records construction details, heating, insulation, and lighting.
- Within a few days you receive your certificate, which is also lodged on the national EPC register.
How Much Does an EPC Cost?
An EPC assessment typically costs between £60 and £120 depending on property size and location. Prices tend to be higher in London and the South East. Some energy companies and local authorities offer free EPCs as part of grant application processes. It is worth asking before you pay out of pocket.
Next Steps
If your EPC rating is D or below, you are likely eligible for significant grant funding to improve your home. Start by checking your current certificate on the national EPC register, then use our free eligibility tool to see which schemes apply to your property.
Not sure which grants you qualify for?
Answer a few quick questions and we'll match you with available schemes based on your EPC rating and property details.
Check your eligibilityFrequently asked questions
- How long is an EPC valid for?
- An EPC is valid for 10 years from the date it was issued. You can use an existing certificate when selling or renting your home as long as it has not expired. If your property has undergone significant energy improvements since the last assessment, it is worth getting a new one to reflect the better rating.
- Do I need an EPC to get a government grant?
- For most energy efficiency grants, yes. ECO4 and GBIS both require your property to have an EPC rating of D, E, F, or G. The Boiler Upgrade Scheme does not require a specific EPC band, but having a current certificate helps your installer design the right system for your home.
- Can I improve my EPC rating without major building work?
- Yes. Low-cost measures such as loft insulation (around £300–£400), draught-proofing, LED lighting, and upgrading your boiler thermostat can each improve your score by several points. Together, these changes can lift a property by one or even two bands without structural alterations.
- What happens if my rental property has an EPC below E?
- Since April 2020, it has been illegal to let a domestic property in England and Wales with an EPC rating below E, unless you have a valid exemption. Landlords who breach the Minimum Energy Efficiency Standards (MEES) can face fines of up to £5,000 per property.