As energy efficiency becomes a bigger consideration for UK homeowners — both for running costs and environmental impact — a growing number of lenders offer "green mortgages" with incentives tied to a property's energy performance. Here's what's actually on offer and how to know if it applies to you.

What a green mortgage typically offers

Green mortgage products generally reward properties with strong Energy Performance Certificate (EPC) ratings — typically band A or B — with incentives such as a discounted interest rate, cashback, or preferential terms compared to the same lender's standard range. Some lenders also offer green further-advance products specifically to fund energy-efficiency improvements to an existing home.

How it's assessed: Eligibility is generally based on the property's current EPC rating, found on the EPC register or provided during a home sale, rather than any assessment of your personal circumstances beyond the standard mortgage application.

Why lenders offer these incentives

Lenders have their own reasons for encouraging green lending, including regulatory and reputational considerations around the environmental performance of their overall mortgage book, alongside a genuine view that energy-efficient properties may carry somewhat lower long-term risk (lower running costs support affordability, and efficient homes may hold value better over time).

Checking your property's EPC rating

Every UK property that's been built, sold or rented in recent years should have a valid EPC, which you can check for free via the government's EPC register using the property's postcode. Ratings run from A (most efficient) to G (least efficient), and most homes in the UK currently sit in the C to D range — meaning a genuine A or B rating, that unlocks the best green mortgage terms, still represents a minority of the housing stock.

Green mortgages for home improvements

Beyond rewarding already-efficient homes, some lenders offer green further-advance or remortgage products specifically to fund improvements like loft or wall insulation, double or triple glazing, solar panels, or a heat pump installation — sometimes at a preferential rate compared to a standard further advance or personal loan for the same purpose.

  • Loft and cavity wall insulation, often relatively low-cost with meaningful efficiency impact
  • Double or triple glazing upgrades
  • Solar panel installation
  • Air source or ground source heat pump systems
  • Smart heating controls and improved boiler efficiency

Is the discount worth pursuing on its own?

Green mortgage discounts vary by lender and market conditions, and are sometimes modest relative to simply shopping the whole market for the lowest available rate regardless of the green label. It's worth comparing a green mortgage's actual rate directly against the best non-green rate you could otherwise access — the "green" label alone shouldn't be assumed to guarantee the cheapest deal available to you.

How EPC rules could affect landlords specifically

Worth knowing: Minimum EPC standards for rental properties have been subject to ongoing government proposals and reform, and buy-to-let landlords in particular should keep an eye on current requirements, since a property falling below a future minimum standard could affect its lettability or require improvement works. Always check the current regulatory position rather than relying on rules that may have since changed.

Practical steps to explore a green mortgage

  1. Check your property's current EPC rating via the government register.
  2. Ask a broker which lenders currently offer green products and how their rates compare to standard deals.
  3. If your EPC rating is borderline, consider whether cost-effective improvements could realistically push you into a qualifying band.
  4. Always compare the green rate against the whole market, rather than assuming it's automatically the best deal.

For related reading, see our guides on Fixed-Rate vs Tracker Mortgages: Which Is Right? and New-Build Mortgages Explained.

Our free Mortgage Affordability Calculator can help you check this against your own figures.

The bottom line

Green mortgages can offer a genuine, if sometimes modest, financial incentive for owning or improving an energy-efficient home, alongside the practical benefit of lower running costs. They're worth exploring if your property already has a strong EPC rating, but always compare the actual rate against the wider market rather than choosing a green product on principle alone.

This article is for general information only and does not constitute financial, legal or tax advice. Rates, thresholds and eligibility criteria change over time — always check current terms with the lender or an FCA-regulated adviser before making a decision. See our full terms and disclaimer.