Green Mortgage UK 2026: What They Are, Rates and Which Properties Qualify

What Is a Green Mortgage?

A green mortgage is a mortgage product that offers a preferential interest rate or additional borrowing for properties with a high energy performance certificate (EPC) rating, typically A or B. Green mortgages are designed to incentivise energy-efficient homeownership and, for some lenders, to fund home improvement works that improve energy efficiency.

The green mortgage market has grown as lenders respond to the government's net zero commitments and the financial risk of stranded assets - properties that may become harder to sell or mortgage as minimum EPC standards for rented and owner-occupied properties are raised over time.

Green mortgage rates are typically 0.1 to 0.3 percentage points lower than equivalent standard products from the same lender for qualifying properties. The discount is modest but reflects the lender's assessment that energy-efficient properties carry lower long-term risk.

Which Properties Qualify for a Green Mortgage?

Most green mortgage products require an EPC rating of A or B to qualify for the preferential rate. EPC ratings run from A (most efficient) to G (least efficient). An EPC rating is required by law for all properties sold or let in the UK and is valid for ten years.

New-build properties almost universally achieve A or B EPC ratings and therefore typically qualify for green mortgage products. Older properties are less likely to qualify without investment in energy efficiency improvements such as insulation, heat pumps, or solar panels.

Some green mortgage products extend eligibility to C-rated properties, particularly where the energy efficiency is in the upper range of the C band. A small number of lenders offer cashback or additional borrowing for properties at lower EPC ratings that are being improved to a higher rating as part of the purchase or remortgage.

Green Mortgage Rates in 2026

Green mortgage rates in 2026 are available from a growing number of UK lenders. Products from Barclays, NatWest, Halifax, Nationwide, and specialist lenders offer green mortgage rates typically 0.1 to 0.3 percent below equivalent standard products.

The green mortgage rate discount is calculated on the standard product rate. On a 200,000 pound mortgage with a green rate 0.2 percent below standard, the annual interest saving is approximately 400 pounds. Over a five-year fixed term, the saving amounts to approximately 2,000 pounds - meaningful but not transformative.

Some green mortgage products offer a higher loan-to-value ratio for energy-efficient properties, reflecting the lender's lower risk assessment for such assets. A lender that might advance 85 percent LTV on a standard property may advance 90 percent LTV on an A or B-rated property under its green mortgage criteria.

Green Mortgages for Home Improvements

Some lenders offer additional borrowing at green mortgage rates specifically for energy efficiency improvements. These green home improvement mortgages allow borrowers to finance insulation, solar panels, heat pumps, or double glazing as part of a remortgage or further advance, with the improvement qualifying the property for a better EPC rating.

The government's Great British Insulation Scheme and Energy Company Obligation provide grants for some energy efficiency improvements to eligible properties, which can reduce the amount that needs to be borrowed through a green mortgage. Checking grant eligibility before arranging green mortgage finance for improvements can significantly reduce the total cost.

For landlords, the potential introduction of minimum EPC standards for rented properties makes green mortgage finance for energy efficiency improvements strategically important. Properties that do not meet the anticipated minimum EPC rating may face restrictions on lettings, making green mortgage-funded improvements a risk management measure as well as a financial product.

Limitations of Green Mortgages

The rate discount on green mortgages is typically modest - 0.1 to 0.3 percent - and does not in itself make an energy-efficient property financially attractive compared with a less efficient one. The primary financial benefit of energy-efficient properties is the reduced energy bill, not the green mortgage rate saving.

Not all lenders offer green mortgage products, which can reduce the comparison pool available for an energy-efficient property. In some cases, a standard mortgage at a very competitive rate from a non-green lender may be cheaper than a green mortgage at a less competitive standard rate with a small green discount applied.

The definition of qualifying EPC rating varies between green mortgage lenders, making direct comparison important. Some require EPC A only, others accept B, and some accept C at reduced discount levels. Confirming the qualifying criteria before assuming a property will benefit from green mortgage rates avoids disappointment after the purchase has been committed.

How to Find a Green Mortgage

Green mortgage products are available directly from lenders and through mortgage brokers. A whole-of-market mortgage broker can compare green mortgage rates across all available providers simultaneously and identify whether the green rate saving is the most competitive option for a specific property.

Borrowers should obtain or check the current EPC certificate for their property before researching green mortgages. The EPC rating determines eligibility and must be current - certificates are valid for ten years. For properties without a current EPC or with an outdated certificate, commissioning a new EPC assessment from an accredited assessor is required before applying.

For those purchasing a new-build property, the developer typically provides EPC documentation as part of the sale. Confirming that the EPC rating meets the qualifying threshold for green mortgage products before exchange enables the buyer to identify the most appropriate product from the market. Confirming the current EPC rating before applying for a green mortgage ensures the property meets the qualifying threshold and avoids the disappointment of discovering ineligibility after the purchase has been agreed.

Frequently Asked Questions

Last reviewed June 2026 · Kael Tripton Editorial