What Is a Green Mortgage?
A green mortgage is a standard residential mortgage with one added criterion: the property must have a high EPC rating, usually A or B. In return, the lender offers either:
- A reduced interest rate (typically 0.10-0.25% off the standard equivalent product)
- A cashback payment on completion (typically £250-£1,000)
- A combination of both
The EPC requirement is the key differentiator. Every property sold, rented, or advertised for sale in the UK must have a valid EPC, which rates energy efficiency from A (most efficient) to G (least efficient). New builds are typically B or A. Older homes are typically D or E unless improved.
Around 18% of UK properties have an EPC rating of A or B as of 2026. Most 1970s-2000s homes sit at C or D. Properties with no loft insulation, single glazing, or inefficient heating typically rate E or below.
Which UK Lenders Offer Green Mortgages?
Green mortgage options in April 2026:
| Lender | Product Name | Typical Benefit | EPC Required |
|---|---|---|---|
| Nationwide | Green Additional Borrowing | Discounted rate + cashback | A or B |
| Halifax | Green Living Reward | £250-£1,000 cashback | A or B |
| Barclays | Green Home Mortgage | Rate discount 0.10% | A or B |
| NatWest | Green Mortgages | Rate discount 0.10-0.20% | A or B |
| Lloyds | Green Additional Borrowing | Discounted rate | A or B |
| Virgin Money | Greener Mortgages | Rate discount 0.05-0.15% | A or B |
| Kensington | eKo Cashback Mortgage | £250-£1,000 cashback | A to C on improvement |
| Paragon (BTL) | Green Buy-to-Let | Rate discount 0.10-0.15% | A or B |
Kensington is slightly different — their eKo product rewards borrowers who improve a C, D, or E rated property to a higher band within 12 months of completion, paying cashback on evidence of improvement works.
Do Green Mortgages Actually Save Money?
The honest answer: sometimes, but often less than the marketing suggests. A typical green discount is 0.10-0.25% below the standard equivalent rate. On a £200,000 mortgage over 5 years:
| Discount | Monthly Saving | 5-Year Saving |
|---|---|---|
| 0.10% | £11 | £660 |
| 0.15% | £17 | £1,020 |
| 0.25% | £28 | £1,680 |
These are real savings, but they need to be compared to the best standard rate available. In some cases, a non-green lender's standard product is cheaper than a different lender's green product, so "green" is not automatically cheapest.
The correct approach: get quotes for both the best green and best standard products at your LTV, and compare total cost including fees. If the green product is within 0.15% of the standard, the tiebreaker often comes down to cashback, free valuation, or conveyancing.
Getting and Using Your EPC
An EPC is valid for 10 years. Most properties already have one from when they were last sold or rented. You can find yours on the official government EPC register by searching your postcode at epcregister.com (for England, Wales and Northern Ireland) or the Scottish equivalent.
If your EPC is expired or not on the register, you will need a new one. Costs are typically £45-£120 from a Domestic Energy Assessor (DEA). The assessment takes around an hour and examines:
- Heating system (boiler age, type, efficiency)
- Insulation (loft, walls, floor)
- Windows (single, double, triple glazing)
- Lighting (energy-efficient bulbs)
- Renewables (solar panels, heat pumps, etc.)
If your current EPC is a C or D and you want to qualify for a green mortgage, you will typically need to make improvements and commission a new EPC post-improvement. Simple upgrades like loft insulation, cavity wall insulation, and LED lighting can often lift a home from D to C, but moving from C to B or A usually requires bigger investments (new boiler, solar panels, external wall insulation).
