Ireland's energy rating system · Updated March 2026
BER Rating Ireland 2026
What It Means for Your Bills
A home rated G costs up to €3,500 more per year to heat than an A-rated home. Improving your BER by just two grades typically saves €400–€800 annually — and SEAI grants cover most of the upgrade cost.
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What is a BER rating?
A Building Energy Rating (BER) is Ireland's official measure of a home's energy efficiency. Introduced under EU law and administered by SEAI, it rates homes on a scale from A1 (most efficient) to G (least efficient), based on how much energy the home needs to heat, cool, and provide hot water per square metre per year.
A BER certificate is legally required when selling or renting a home in Ireland. It is issued by a registered BER assessor who inspects the property and enters data into the DEAP software (Dwelling Energy Assessment Procedure). The certificate is valid for 10 years.
BER is measured in kilowatt-hours per square metre per year (kWh/m²/yr). An A1 home uses less than 25 kWh/m²/yr. A G home uses over 450 kWh/m²/yr. The difference in running costs between these two extremes on a typical 100m² house is over €3,000 per year.
BER ratings A1 to G — and what they cost
Annual heating cost estimates for a 100m² Irish home. Electricity at €0.38/kWh, gas at €0.12/kWh, oil at €1.10/litre.
New builds, passive houses
High-spec new builds
Target for retrofits. Landlord legal threshold from 2025.
Post-2000 homes with some upgrades
Most post-1990 homes, unimproved
Pre-1990 homes, partial insulation
Pre-1980 homes, minimal insulation
Pre-1960 homes, no insulation
Pre-1940 stone homes, no upgrades
Why BER B2 matters for landlords
Important: Landlord minimum BER requirements
Under Irish regulations, all new tenancies must meet a minimum BER of D1 from 2025. The government has signalled a further tightening to B2 by 2030 for all rental properties. Landlords who do not upgrade face inability to legally rent, and potentially significant fines.
For landlords, reaching B2 is not just a legal obligation — it's an investment. Properties with higher BER ratings command higher rents in Ireland's tight rental market. In Dublin, Galway, and Cork, a B2-rated 3-bed house can achieve 8–12% higher rent than the same home rated D or E.
SEAI's Landlord Grant Scheme provides grants of up to €15,000 per rental property. Works must be completed by an SEAI-registered contractor and the home must be a registered rental with the RTB (Residential Tenancies Board).
Check landlord grant eligibility →Which upgrades improve your BER the most?
| Upgrade | Typical BER improvement | SEAI grant available |
|---|---|---|
| Heat pump (replacing oil boiler) | 2–3 grades | €12,500 |
| External wall insulation | 1–2 grades | €8,000 |
| Attic insulation (300mm) | 0.5–1 grade | €2,000 |
| Cavity wall insulation | 0.5–1 grade | €1,700 |
| Floor insulation | 0.3–0.5 grade | €3,500 |
| Solar PV (4kWp) | 0.3–0.5 grade | €1,600 |
| Triple glazing | 0.3–0.5 grade | None currently |
| Heating controls upgrade | 0.2–0.4 grade | €700 |
BER improvements are approximate and depend on your home's starting point and size. A BER assessor will give you exact projected improvements.
How to get a BER certificate — and what it costs
A BER assessment must be carried out by a registered BER assessor — you can find one at seai.ie. The assessment involves an inspector visiting your home for 1–2 hours, measuring the floor area, recording insulation levels, noting the heating system, and checking window specifications.
Typical BER certificate costs in Ireland
- 1–2 bed apartment€100–€150
- 2–3 bed house€150–€200
- 4+ bed house€200–€280
- Large/complex property€280–€400
After energy upgrades, you should commission a new post-works BER to update your certificate and show the improvement. This is required for the heat pump grant and recommended for resale. Many contractors include a post-works BER in their quote.
Get your BER improvement plan free
Our checker shows which upgrades will improve your BER the most — and which SEAI grants you qualify for right now.
Start your free home checkBER FAQ
Do I need a BER cert to sell my house?
Yes. A BER certificate is a legal requirement when selling or renting a property in Ireland. It must be provided to prospective buyers or tenants before contracts are signed. Estate agents are legally required to include the BER rating in property listings.
How accurate are BER ratings?
BER ratings are calculated using standardised assumptions (standard occupancy, standard heating patterns) rather than actual bills. Two identical houses with different occupants may have very different actual energy bills but the same BER. The rating is a comparative tool, not a guaranteed bill predictor.
Can I improve my BER without a full retrofit?
Yes. Even relatively simple upgrades like attic insulation (€500–€1,500 after grant) or heating controls (€500–€800 after grant) can improve your BER by half a grade. Combine two or three measures and you can move up a full grade, improving your home's marketability and reducing bills.
What BER do I need to get a green mortgage?
Most Irish banks offering green mortgages (Bank of Ireland, AIB, Permanent TSB) require a minimum BER of B3 or better. Homes rated B3 or above qualify for reduced interest rates, typically 0.3–0.5% lower than standard rates — a saving of €2,000–€5,000 over the life of a mortgage.