A green mortgage is a home loan that offers preferential interest rates for energy-efficient properties — typically those with an EPC rating of A or B. Several major UK lenders now incentivise eco-friendly homes with rate discounts of 0.1–0.3%.
What Is a Green Mortgage?
A green mortgage is a mortgage product that offers a financial incentive — usually a lower interest rate or cashback — for buying or owning an energy-efficient home. Most green mortgage products require an Energy Performance Certificate (EPC) rating of A or B.
The logic is simple: energy-efficient homes have lower running costs, which means homeowners have more disposable income and are statistically less likely to default on their mortgage. This lower risk allows lenders to offer more competitive rates.
Green mortgages are available for purchases, remortgages, and in some cases as additional borrowing to fund energy-efficiency improvements to your existing property.
Understanding EPC Ratings
An Energy Performance Certificate (EPC) rates your property's energy efficiency on a scale from A (most efficient) to G (least efficient). It's a legal requirement when selling or renting a property.
- A rating (92–100): Exceptional energy efficiency. Rare in existing homes — mostly new builds with solar panels, heat pumps, and excellent insulation.
- B rating (81–91): Very efficient. Well-insulated modern homes or older homes with significant upgrades.
- C rating (69–80): Good efficiency. The government's target for all homes by 2035.
- D rating (55–68): The current UK average. Typical of homes built between 1950–1990 without major upgrades.
- E–G ratings: Poor efficiency. Higher energy bills and potentially harder to mortgage.
An EPC is valid for 10 years and costs around £60–£120 to commission. If you've made energy improvements since your last EPC, it's worth getting a new one before applying for a mortgage.
Which Lenders Offer Green Mortgages?
An increasing number of UK lenders now offer green mortgage products. Here are some of the main options available in 2026:
- Barclays: Green Home Mortgage offering a preferential rate for EPC A or B properties.
- NatWest: Green mortgage with a rate discount and additional borrowing for energy improvements.
- Halifax / Lloyds: Green Living Reward — cashback for EPC A or B properties.
- Nationwide: Green Additional Borrowing — borrow up to £25,000 for energy improvements at a preferential rate.
- Virgin Money: Greener Choice mortgage with rate discounts.
- Ecology Building Society: Specialist green lender offering discounts based on the property's environmental credentials.
The green mortgage market is evolving rapidly. A broker with access to 90+ lenders can identify which green products are available for your specific circumstances — including deals from smaller lenders not listed above.
How to Improve Your EPC Rating
If your home currently has an EPC rating of C or below, there are several improvements that can boost it:
- Loft insulation (£300–£600): One of the cheapest and most effective upgrades. Can improve your rating by 1–2 bands.
- Cavity wall insulation (£500–£1,500): Significant heat loss reduction if your property has unfilled cavity walls.
- Double/triple glazing (£3,000–£10,000): Reduces heat loss through windows and improves comfort.
- Solar panels (£4,000–£8,000): Generate your own electricity and earn through the Smart Export Guarantee.
- Heat pump (£8,000–£15,000): Replaces gas boiler with a more efficient electric heating system. Government grants of up to £7,500 available through the Boiler Upgrade Scheme.
- Smart heating controls (£200–£400): Programmable thermostats and zone heating can improve efficiency.
- LED lighting (£50–£200): Simple switch from halogen to LED throughout the property.
Some lenders offer green additional borrowing — you can borrow against your property specifically to fund these improvements, often at preferential rates.
Green Mortgages and New Builds
New-build properties are much more likely to achieve an EPC rating of A or B, making them natural candidates for green mortgage products. Since 2022, new homes must meet Part L building regulations requiring significantly improved energy efficiency.
Many new build developments now feature:
- Air source heat pumps or ground source heat pumps
- Solar panels and battery storage
- Triple glazing and enhanced insulation
- Smart home energy management systems
- EV charging points
If you're buying a new build with an EPC of A or B, ask your broker about green mortgage options — you could save significantly on your rate compared to standard products.
The Financial Case for Green Homes
Energy-efficient homes offer multiple financial benefits beyond a cheaper mortgage rate:
- Lower energy bills: An EPC A-rated home can save £1,000–£2,000+ per year on energy bills compared to an EPC D-rated home.
- Higher property value: Research by the Department for Energy shows that improving from EPC D to B can add 3–5% to a property's value.
- Future-proofing: The government plans to require all homes to reach EPC C by 2035. Properties that already meet this standard are more attractive to buyers.
- Government grants: The Boiler Upgrade Scheme offers up to £7,500 towards heat pump installation. Local authority grants may also be available.
Frequently Asked Questions
- Do I need an EPC to get a green mortgage?
- Yes. You'll need a valid EPC showing an A or B rating. If your current EPC is outdated or you've made improvements, commission a new one (£60–£120) before applying.
- Can I get a green mortgage on an older property?
- Yes, if it has been upgraded to achieve an EPC rating of A or B. Older properties that have had comprehensive insulation, double glazing, and heating upgrades can qualify.
- Is a green mortgage cheaper than a standard mortgage?
- Typically yes — green mortgage rates are usually 0.1%–0.3% lower than equivalent standard products. On a £250,000 mortgage, that could save £250–£750 per year.
- Can I borrow extra to make my home more energy efficient?
- Some lenders offer 'green additional borrowing' specifically for energy improvements. Nationwide, NatWest, and others allow you to borrow additional funds at preferential rates for upgrades like insulation, solar panels, or heat pumps.
- Will the government make green mortgages mandatory?
- Not currently, but the direction of policy is clear. The government's Net Zero strategy aims for all homes to reach EPC C by 2035. Lenders are increasingly factoring energy efficiency into their lending decisions.
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