An Energy Performance Certificate (EPC) rates a property's energy efficiency from A (best) to G (worst). It used to be a piece of paper buyers glanced at and ignored. Since the UK government confirmed in January 2026 that all rented homes must reach EPC C by 1 October 2030, with fines up to £30,000 for non-compliance, EPCs have become one of the most important factors in property finance, for landlords especially, but increasingly for owner-occupiers too.
What an EPC actually is
An EPC measures how energy-efficient a property is, scored 1-100 and mapped to a letter grade:
- A (92-100): Highly efficient, very low energy bills. Rare in older UK stock.
- B (81-91): Efficient, typical of new builds with modern insulation.
- C (69-80): Above average. The 2030 minimum for rented homes.
- D (55-68): Around the UK average for existing housing stock.
- E (39-54): Below average. Current minimum for rentals (since 2020).
- F-G (≤38): Poor. Currently unable to be let except with exemptions.
The 2030 EPC C requirement, confirmed January 2026
On 21 January 2026, the UK government confirmed that all rented homes in England and Wales must achieve a minimum EPC C rating by 1 October 2030. Key details:
- Single deadline: 1 October 2030 for both new and existing tenancies (an earlier proposal to split the deadline was dropped).
- £10,000 cost cap per property: landlords must spend up to this amount on improvements. Spending from 1 October 2025 counts toward the cap.
- For properties valued below £100,000: alternative 10% property value cap applies.
- Fines up to £30,000 per property for non-compliance (up from £5,000 previously).
- New EPCs from 1 October 2029 will use a revised methodology called the Home Energy Model (HEM).
Who's affected
Direct legal impact:
- Buy-to-let landlords, all rentals must meet EPC C by 1 October 2030 or face fines and be unable to let.
- Owner-occupiers, currently no legal requirement, but practical impact is rising (see next sections).
- Commercial property, separate but parallel timeline for non-domestic premises.
- HMOs and shared accommodation, included under the same rules as standard rentals.
What this means for owner-occupiers
Technically there's no legal EPC requirement for owner-occupied homes. But the practical impact is significant:
- Green mortgages, many lenders offer lower rates on properties rated EPC C or above. The discount is typically 0.1-0.3%.
- Future saleability, anyone who might let the property in the future (downsizing parents, accidental landlords) will need it at EPC C.
- Re-mortgaging, some lenders are starting to favour higher EPC ratings in their criteria, especially for additional borrowing for green improvements.
- Resale to landlords, properties below EPC C will increasingly trade at a discount to reflect the upgrade cost the buyer faces.
How EPC affects buy-to-let mortgages
If you are a landlord weighing up the cost of getting to band C, see our guide to how landlords can fund EPC C upgrades, covering further advances, second charge loans and capital raising remortgages.
Buy-to-let lender criteria are tightening around EPC:
- Most BTL lenders now lend at standard rates on EPC A-C properties.
- Many lenders apply tighter affordability assessments on D-E rated properties.
- Some lenders refuse to lend on EPC F-G properties at all.
- Green BTL mortgages with reduced rates are available on C and above, typically 0.1-0.25% off.
- Further advances / additional borrowing for energy improvements is increasingly common and competitively priced.
What raises an EPC rating
Common improvements and their typical EPC impact:
- Loft insulation (270mm minimum), typically +5-15 points.
- Cavity wall insulation, typically +5-12 points (only possible on certain construction types).
- Double or triple glazing, typically +3-8 points.
- Modern condensing boiler, typically +5-10 points.
- Heat pump, substantial improvement, often +15-20 points, but expensive to install.
- Solar PV, variable depending on system size and property; can add 5-15 points.
- Smart heating controls, small but real improvement (+2-5 points).
- LED lighting throughout, small (+1-2 points) but very cheap.
Getting an EPC done
An EPC is required when you sell or rent a property. They're done by a Domestic Energy Assessor (DEA), typically cost £60-£150, and last 10 years (unless you make improvements and want a new one to reflect them).
If you're a landlord planning improvements toward the 2030 deadline, get a current EPC done now and use the recommendations section as your plan. It tells you the cheapest improvements that have the biggest impact for your specific property.
EPC compliance is becoming one of the biggest issues in UK property finance. Landlords with portfolios in older stock need a 4-year plan starting now; owner-occupiers benefit from green mortgages and protect future saleability. Debbie at DS Financial arranges buy-to-let mortgages with EPC criteria in mind and can advise on financing energy improvements via further advances or remortgaging.
General information, not financial advice. Your home may be repossessed if you do not keep up repayments on your mortgage.
Sources: GOV.UK, EPC requirements (Jan 2026 confirmation), EPC Register (search by address), Energy Saving Trust.
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