EPC Rating Guide: Improve Your Home's Energy Rating
An Energy Performance Certificate (EPC) measures your home's energy efficiency on a scale from A (most efficient) to G (least efficient). The average UK home has an EPC of D.
Improving your EPC reduces energy bills, increases comfort, and adds significant value to your property — each grade improvement adds an estimated £5,000–£10,000 to your home's sale price. Government grants through ECO4, HUG2, and the Boiler Upgrade Scheme cover a significant portion of upgrade costs.
Last updated March 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Quick Answer
An EPC (Energy Performance Certificate) rates your home from A (most efficient) to G. The average UK home is rated D. Each grade improvement adds £5,000–£10,000 to property value. Government grants through ECO4, HUG2, and the Boiler Upgrade Scheme cover a significant portion of upgrade costs — solar panels, insulation, and heat pumps are the most cost-effective upgrades.
What is an EPC rating?
An EPC (Energy Performance Certificate) shows how energy-efficient a home is. It uses the RdSAP (Reduced Data Standard Assessment Procedure) methodology to calculate an energy efficiency score from 1 to 100, mapped to grades A–G. An EPC assessor visits your home, measures the building fabric (walls, roof, windows, floors), heating system, and ventilation, and calculates the energy use per square metre per year (kWh/m²/yr).
Key points
- EPC certificates are valid for 10 years
- Legally required when selling or renting a property
- Assessment costs £60–£120
- EPC assessors are accredited through approved schemes (Elmhurst, Quidos, Stroma, etc.)
- Rental properties must achieve a minimum EPC of E under MEES (Minimum Energy Efficiency Standards)
EPC rating scale explained
| Rating | SAP Score | Description | Typical Home |
|---|---|---|---|
| A | 92–100 | Most efficient | New builds with renewables |
| B | 81–91 | Very efficient | New builds (post-2021) |
| C | 69–80 | Good | Well-renovated older homes |
| D | 55–68 | Average | Some renovated homes |
| E | 39–54 | Below average | Pre-2000 homes, basic upgrades |
| F | 21–38 | Poor | 1960s–1980s homes |
| G | 1–20 | Least efficient | Pre-1960 homes, no upgrades |
The average EPC in the UK is D. Over 60% of UK homes were built before building regulations introduced energy efficiency standards. These homes typically have poor insulation, single-glazed windows, and gas boilers.
What upgrades improve your EPC rating?
| Upgrade | EPC Improvement | Typical Grant | Typical Cost |
|---|---|---|---|
| Loft insulation (270mm) | 1–2 grades | Free via ECO4/GBIS | £500–£1,500 |
| Cavity wall insulation | 1–2 grades | Free via ECO4/GBIS | £500–£1,500 |
| External wall insulation | 2–3 grades | Up to £10,000 via HUG2 | £8,000–£18,000 |
| Internal wall insulation | 1–2 grades | Up to £6,000 via HUG2 | £4,000–£12,000 |
| Windows (double/triple glazed) | 1–2 grades | Varies by scheme | £4,000–£12,000 |
| Heat pump installation | 2–3 grades | £7,500 via BUS | £10,000–£18,000 |
| Solar PV panels | 1–2 grades | Up to £1,500 via ECO4 | £5,000–£10,000 |
| Ventilation (MVHR) | 0.5–1 grade | Varies by scheme | £4,000–£6,000 |
Recommended upgrade order
- Insulate first (loft → walls → floor) — cheapest, biggest impact
- Upgrade windows if single-glazed
- Install heat pump (replaces gas/oil boiler)
- Add solar PV panels
- Consider ventilation (MVHR) for airtight homes
EPC upgrade costs and savings
Example upgrade path for a typical D-rated 3-bed semi-detached:
| Step | Upgrade | Cost | Grant | Net Cost | New EPC |
|---|---|---|---|---|---|
| 1 | Loft insulation | £1,000 | Free via ECO4 | £0 | D→D (higher) |
| 2 | Cavity wall insulation | £1,000 | Free via ECO4 | £0 | D→C |
| 3 | Heat pump (BUS grant) | £12,000 | £7,500 | £4,500 | C→B |
| 4 | Solar PV (4kWp) | £7,000 | £1,500 | £5,500 | B→B (higher) |
| Total | £21,000 | £10,000+ | £10,000 | D→B |
Annual energy savings from D to B: approximately £1,000–£2,000/year. Payback period on the net £10,000 investment: 5–10 years.
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Get a Quote ↓UK government grants for EPC upgrades
| Scheme | Measure | Grant Amount |
|---|---|---|
| ECO4 / Great British Insulation Scheme | Loft insulation | Free (if eligible) |
| ECO4 / Great British Insulation Scheme | Cavity wall insulation | Free (if eligible) |
| HUG2 (Home Upgrade Grant) | External wall insulation | Up to £10,000 |
| HUG2 (Home Upgrade Grant) | Internal wall insulation | Up to £6,000 |
| BUS (Boiler Upgrade Scheme) | Air source heat pump | £7,500 |
| BUS (Boiler Upgrade Scheme) | Ground source heat pump | £7,500 |
| ECO4 | Solar PV | Up to £1,500 |
| ECO4 | First-time central heating | Fully funded (if eligible) |
| Various | Windows (energy efficient) | Varies by scheme |
ECO4 and the Great British Insulation Scheme are available for eligible households based on income and EPC rating. HUG2 is for off-gas-grid homes with EPC D, E, F, or G. BUS is available to all homeowners replacing fossil fuel heating. Must use MCS-certified installers for renewable measures and TrustMark registered contractors for insulation.
Energy bills by EPC rating
Your EPC rating directly impacts how much you spend on heating and electricity. Here's what typical UK homes pay annually by EPC grade:
| EPC Rating | Typical Annual Energy Bill | Saving vs G-rated |
|---|---|---|
| G (SAP 1–20) | £4,500+ | — |
| E–F (SAP 21–54) | £3,000–£4,000 | £500–£1,500/yr |
| D (SAP 55–68) | £2,000–£3,000 | £1,500–£2,500/yr |
| C (SAP 69–80) | £1,200–£2,000 | £2,500–£3,300/yr |
| B (SAP 81–91) | £700–£1,200 | £3,300–£3,800/yr |
| A (SAP 92–100) | £300–£700 | £3,800–£4,200/yr |
Based on a 100m² semi-detached home using typical 2025/2026 energy prices. Actual costs vary by fuel type, tariff, and household size.
EPC certificate: when you need one
An EPC certificate is legally required in several situations. Non-compliance carries fines of up to £5,000.
Selling a property
An EPC must be obtained before listing the property for sale. Must be made available to prospective buyers and displayed in all advertisements.
Renting a property
EPC required before advertising a rental property. A minimum EPC of E is required for all new and existing tenancies under MEES (Minimum Energy Efficiency Standards).
Mortgage applications
Many lenders require a valid EPC certificate as part of the mortgage application process. Green mortgages offer lower rates for energy-efficient homes (EPC A–C).
New builds
All new homes must have an EPC. Current Building Regulations (Part L 2021) require new homes to produce significantly lower carbon emissions, typically achieving EPC A or B.
EPC certificate details
- Cost: £60–£120 for the assessment
- Validity: 10 years (unless significant upgrades are made)
- Duration: Assessor visits for 30–60 minutes
- Turnaround: Certificate usually available within a few days
- Penalty: Fines up to £5,000 for landlords not meeting MEES requirements
Step-by-step: improving your EPC
- Get an EPC assessment — Find an accredited EPC assessor (through schemes like Elmhurst, Quidos, or Stroma). They'll visit your home and produce a report showing your current rating and recommended improvements.
- Identify the best upgrades — The EPC report includes a recommendations section highlighting the most impactful improvements, with estimated costs and savings.
- Check grant eligibility — Visit GOV.UK or the Energy Saving Trust to check which schemes (ECO4, HUG2, BUS, Great British Insulation Scheme) apply to your home.
- Get quotes from certified contractors — Get at least 3 quotes. Use MCS-certified installers for heat pumps and solar, and TrustMark registered contractors for insulation to qualify for grants.
- Apply for grants — For BUS, your MCS-certified installer applies on your behalf. For ECO4 and GBIS, contact your energy supplier or local authority.
- Complete the upgrades — Follow the fabric-first approach: insulate first, then upgrade heating and add renewables.
- Get a new EPC assessment — Recommended after upgrades to confirm the improvement and demonstrate the higher rating to buyers or lenders.
EPC rating and property value
Research shows each EPC grade improvement adds approximately £5,000–£10,000 to UK property values. A home upgraded from D to B could see a value increase of £15,000–£30,000 — more than the net cost of upgrades after grants.
Buyers prefer higher EPC
Properties with EPC A–C sell for up to 14% more than equivalent G-rated homes.
Legal requirement
EPC certificate required for sale or rental since 2008 (England & Wales).
Rental market
Minimum EPC of E required for all tenancies under MEES. A minimum of C has been proposed for future regulation.
Green mortgages
Many lenders offer lower rates for EPC A–C homes, including Barclays, NatWest, and Nationwide.
EPC Rating FAQ
How much does an EPC assessment cost?
An EPC assessment costs £60–£120 depending on the size and location of your home. The assessor visits for 30–60 minutes and the certificate is usually available within a few days.
Is an EPC certificate required to sell a house in the UK?
Yes. An EPC certificate has been legally required when selling or renting a property in England and Wales since 2008. Penalties of up to £5,000 apply for non-compliance.
How long is an EPC certificate valid?
10 years. However, if you make significant energy upgrades, you should get a new EPC assessment to reflect the improved rating, which can increase property value.
What is the minimum EPC for rental properties in the UK?
Since April 2020, all rental properties in England and Wales must have a minimum EPC of E under MEES (Minimum Energy Efficiency Standards). A minimum of C has been proposed for future regulation.
Can I improve my EPC without major renovations?
Yes. Loft insulation and cavity wall insulation are relatively quick and affordable (often fully funded through ECO4 or the Great British Insulation Scheme) and can improve your EPC by 1–2 grades. Upgrading your boiler controls and lagging pipes also helps.
What EPC do I need for a heat pump?
Heat pumps work best in well-insulated homes (EPC C or better). If your home is D-rated or worse, it's usually best to insulate first, then install a heat pump. The Boiler Upgrade Scheme provides £7,500 towards heat pump installation.
Do solar panels improve EPC?
Yes. A 4kWp solar PV system typically improves an EPC by 1–2 grades. Solar PV is one of the most cost-effective EPC upgrades due to the electricity savings it provides.
What grants are available for home energy upgrades in the UK?
The main UK schemes are ECO4 (insulation and heating for eligible households), the Great British Insulation Scheme, HUG2 (Home Upgrade Grant for off-gas homes), and BUS (Boiler Upgrade Scheme — £7,500 towards heat pumps). Eligibility varies by scheme.
Related Guides
Home Insulation
Loft, cavity wall, and solid wall insulation: costs, grants, and savings.
Heat Pumps
Air source & ground source heat pumps: costs, BUS grant up to £7,500.
Solar Incentives
0% VAT, Smart Export Guarantee, ECO4, and business capital allowances.
Whole-House Retrofits
Whole-house energy upgrades with ECO4 and HUG2 schemes.
Sources
- GOV.UK: Energy Performance Certificates
- GOV.UK: Boiler Upgrade Scheme
- Energy Saving Trust: Energy at Home
- EPC Register: Find an EPC
- GOV.UK: MEES for Landlords
Last updated: March 2026
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
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