Green Mortgages: Does Solar Help Your Mortgage?

Green mortgages reward homeowners for energy-efficient properties — and solar panels are one of the most effective ways to qualify. With several major UK lenders now offering preferential rates for greener homes, solar can deliver a financial benefit beyond just electricity savings.

What Is a Green Mortgage?

A green mortgage is a standard residential mortgage with a lower interest rate or cashback incentive for properties that meet certain energy efficiency criteria — usually an EPC rating of A or B, though some products accept C.

The lender's logic: energy-efficient homes have lower running costs, so homeowners are less likely to default on mortgage payments. The homes also tend to hold their value better as energy regulations tighten. It's rational risk pricing, not charity.

Which Lenders Offer Green Mortgages in 2026?

The market is evolving rapidly, but as of early 2026:

Check current availability directly, as products change frequently. Whole-of-market mortgage brokers can search across all lenders for the best green deal.

How Solar Panels Affect Your EPC

An EPC (Energy Performance Certificate) rates your home from G (worst) to A (best). Solar panels directly improve your EPC score because they reduce the energy your home needs from the grid.

Typical EPC improvement from solar:

• 3–4 kW system: Usually improves EPC by 5–15 SAP points
• 4–6 kW system with battery: Can improve by 10–20 SAP points

In practice, this often translates to:

• A D-rated home moving to C
• A C-rated home moving to B
• A B-rated home moving to A (in some cases)

The exact improvement depends on your home's current rating, its construction, and other efficiency measures already in place. A home that's already well-insulated will see a smaller relative improvement than a less efficient property.

The Financial Impact

Let's quantify the mortgage benefit. On a £250,000 mortgage over 25 years:

• 0.1% rate reduction: Saves approximately £2,800 over the mortgage term (roughly £9/month)
• 0.2% rate reduction: Saves approximately £5,500 over the term (roughly £18/month)
• 0.3% rate reduction: Saves approximately £8,200 over the term (roughly £27/month)

Plus any one-off cashback (typically £250–£500 on green mortgage products).

These savings compound on top of:

• Electricity bill savings (£500–£1,000/year)
• SEG export income (£100–£400/year)
• Property value increase (typically £5,000–£15,000)

Using Your Mortgage to Fund Solar

Here's where it gets interesting. You can potentially use your mortgage to fund the solar installation itself — and then benefit from the green mortgage rate on your next remortgage.

Option 1: Further advance

Ask your current lender for a further advance (additional borrowing on your existing mortgage) to cover the solar installation. This is secured borrowing at mortgage rates — typically much cheaper than a personal loan.

Option 2: Remortgage with solar included

If your fixed deal is ending, remortgage for a slightly higher amount that covers the solar cost. At mortgage rates, the additional monthly cost of £7,000–£8,000 spread over 25 years is only £35–£45/month.

Option 3: Install first, green mortgage later

Install solar, get your new EPC certificate, then apply for a green mortgage product on your next remortgage. The improved EPC unlocks the better rate.

Green Additional Borrowing Products

Some lenders offer specific products for borrowing to fund green home improvements:

• Nationwide: Green Additional Borrowing at preferential rates for energy efficiency improvements
• Barclays: Green Home Improvement further advance product
• NatWest: Green borrowing for EPC-improving works

These products specifically fund energy efficiency measures (solar, insulation, heat pumps) at better rates than standard additional borrowing. They're worth asking about even if they're not prominently advertised.

The Landlord Angle

If you're a buy-to-let landlord, green mortgages are particularly relevant because:

1. MEES regulations require rental properties to meet minimum EPC standards (currently E, moving to C)
2. Green buy-to-let mortgage products exist with preferential rates for efficient properties
3. Solar can help meet MEES requirements while also reducing void periods (tenants prefer lower bills)

See our MEES guide for landlord-specific details.

These solar systems can help you reach the EPC band needed for green mortgage benefits:

LONGi Hi-MO X6 450W

£85

watt peak

450

efficiency pct

23

dimensions mm

1722 x 1134 x 30

weight kg

21.3

View on Amazon

Affiliate link — we may earn a small commission at no extra cost to you

JA Solar JAM54D41 450W N-type TOPCon

£82

watt peak

450

efficiency pct

22.8

dimensions mm

1722 x 1134 x 30

weight kg

21.5

View on Amazon

Affiliate link — we may earn a small commission at no extra cost to you

Practical Steps

1. Check your current EPC — look it up free at gov.uk/find-energy-certificate
2. Estimate your post-solar EPC — ask an assessor or solar installer
3. Check green mortgage availability — speak to a whole-of-market broker
4. Compare the total benefit — mortgage saving + electricity saving + SEG income + property value
5. Time it with your remortgage — if your fix is ending soon, install solar first to unlock the green rate

The green mortgage benefit alone won't justify a solar installation. But combined with electricity savings, export income, and property value improvement, it makes an already strong financial case even stronger.

For a broader view of how solar affects your home's value, see our property value guide.

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