Green mortgages offer lower interest rates for energy-efficient homes, but you need a BER certificate that meets the lender's minimum rating. Here's what each Irish bank requires and how to make sure your home qualifies.
What Is a Green Mortgage?
A green mortgage is a home loan product that offers a reduced interest rate for properties that meet certain energy efficiency standards, measured by the BER rating. The discount reflects the lower risk associated with energy-efficient homes (lower running costs mean borrowers are less likely to default) and supports Ireland's climate targets. Most major Irish lenders now offer some form of green mortgage product.
BER Requirements by Lender
Each lender sets its own minimum BER requirement. As of 2026, the general landscape is that most Irish lenders require a BER of B3 or better to qualify for their green mortgage rate. Some lenders offer tiered discounts, a better rate for A-rated homes than for B-rated homes. The exact rates and requirements change frequently, so always check directly with your lender or mortgage broker for current terms.
Several lenders also offer an improved rate if you upgrade your BER after purchase. For example, Bank of Ireland's EcoSaver product allows you to improve your rate by demonstrating a one-letter improvement in your BER rating during the fixed-rate period.
How to Get Your Home to Green Mortgage Standard
If your home currently rates below B3, targeted upgrades can bring it up to green mortgage eligibility. The most cost-effective path depends on your property type and current rating. For a typical D-rated 1980s/90s semi-detached house, a combination of cavity wall insulation, attic insulation top-up, and a boiler upgrade can often reach B3. For older properties or homes with solid walls, external insulation and window upgrades may be needed. See our complete guide to improving your BER rating. If you're buying a new build, visit our new build BER page for specific requirements for upgrade-by-upgrade advice, and use the SEAI grant calculator on HomeEnergyGuide.ie to see what grants you can claim towards the cost of upgrades.
If you're buying a property that doesn't yet meet the green mortgage threshold, some lenders allow you to take the mortgage at standard rates and then switch to the green rate once you've completed upgrades and obtained a new BER showing B3 or better.
Getting Your BER for a Green Mortgage Application
Your lender will need a valid, current BER certificate as part of the mortgage application. If the property's existing BER is expired or you've made upgrades since the last assessment, you'll need a fresh BER. We can typically turn around a BER assessment within a few days of booking, which helps keep your mortgage application on track.
Need a BER for a green mortgage application? Call 087 777 4155 for a fast assessment.
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