What Is a Good BER Rating? The BER Scale Explained for Irish Homeowners
A good BER rating in Ireland is a B or better. On the simplified scale that took effect in May 2026, A0 and A sit at the top, while B marks a well-insulated, efficient home. C is the most common rating for houses built between the late 1970s and mid-2000s. Meanwhile, D to G usually point to older homes.
Why Your BER Letter Matters
Every home for sale or rent in Ireland needs a Building Energy Rating, so most homeowners have seen one. However, few people know whether their letter counts as a good BER rating or a warning sign.
That question matters more than ever. Buyers now compare running costs, lenders link some mortgage rates to the rating, and the scale itself changed in 2026.
This guide focuses only on what each band means, what to expect for your home’s age, and how buyers and lenders read the letter. For the legal rules on certificates, see our guide to the BER certificate in Lucan. For practical upgrades, read how to increase your home’s value in Lucan.
How the BER Scale Works
A BER estimates how much energy a home needs for heating, hot water, ventilation and lighting. It measures the building, not your habits. So, a family that keeps the heating low gets the same rating as one that keeps it high.
The assessor expresses the result in kilowatt-hours per square metre per year (kWh/m²/yr). In other words, a lower number means a more efficient home and a better letter.
The Old Scale and the New Scale
From 24 May 2026, Ireland moved from 15 rating levels to eight. The new bands run A0, A, B, C, D, E, F and G, and the sub-bands such as B1, B2 and B3 no longer exist.
Importantly, certificates issued before that date stay valid for ten years and keep their original letter. As a result, you’ll see both styles on Daft.ie and MyHome.ie for years to come.
Reading an Older Certificate
On the old scale, each sub-band covered a set range of energy use. A1 meant 25 kWh/m²/yr or less, while G meant more than 450. Under the new scale, A1 to A3 broadly fold into A, B1 to B3 into B, and C1 to C3 into C.
What Each BER Band Means
Here’s a plain-English guide to each band on the new scale. Above all, treat these as general descriptions, because two homes with the same letter can still differ.
The Top of the Scale
- A0: This new band covers the most efficient homes that use no fossil fuels on site. For example, a gas boiler or a solid-fuel stove rules a home out.
- A: Typically a modern home with high insulation levels, airtight construction and a heat pump. Running costs tend to be very low.
- B: A well-insulated, efficient home. Often, it’s a 2005–2014 build or an older home that has had a deep retrofit.
The Middle and Lower Bands
- C: The most common rating for homes built from the late 1970s to the mid-2000s. Usually, it means some insulation but an older heating system.
- D: Common in older semi-detached homes with partial upgrades. Consequently, buyers often expect to budget for insulation or windows.
- E and F: Typically older homes with limited insulation and dated heating. In practice, buyers see clear room for improvement.
- G: The least efficient band. It often applies to period homes, older cottages or properties that have never had an upgrade.
Typical BER Ratings by House Age
House age is the single best predictor of a BER. That’s because building regulations tightened sharply over the decades, especially from the late 2000s onwards.
What the CSO Data Shows
The Central Statistics Office (CSO) publishes BER figures by period of construction. Its Domestic Building Energy Ratings release for Q1 2025 shows a clear pattern.
| Period Built | Share Rated A | Most Common Pattern |
|---|---|---|
| Before 1978 | 3% | 28% rated F or G |
| 1978–1999 | 2% | C is most common (41%) |
| 2000–2004 | 2% | C is most common (57%) |
| 2005–2009 | 4% | B is most common (41%) |
| 2010–2014 | 37% | B is most common (55%) |
| 2015–2019 | 94% | Almost all A-rated |
| 2020–2024 | 99% | Almost all A-rated |
Source: CSO, Domestic Building Energy Ratings Q1 2025. Figures reflect each home’s most recent BER audit.
Why Age Isn’t the Whole Story
Dwelling type matters too. For instance, the CSO found that mid-floor apartments achieve A ratings more often than any other home type, while detached houses lag behind. That makes sense, because a detached house loses heat through four exposed walls.
Similarly, upgrades can lift an older home well above its age group. A 1980s semi with external insulation and a heat pump can reach B or even A.
So, What Counts as a Good BER Rating?
The honest answer depends on the age of your home. Still, three practical benchmarks help.
- B or better is the widely used standard. SEAI’s One Stop Shop retrofit scheme targets a B after works, and several lenders use A or B as their green mortgage threshold.
- C is a fair result for a 1980s to early-2000s home. For that age group, it’s average rather than poor.
- D or below signals upgrade potential. However, it isn’t a barrier to selling, because buyers of older homes expect it.
In short, judge your rating against similar homes, not against a brand-new build.
How Buyers Read a BER
Buyers use the BER as a quick guide to running costs and future spending. Therefore, they read it alongside the price, not in isolation.
Comparing Like With Like
A buyer looking at a 1990s semi will compare it with other 1990s semis. So, a C or a B in that group can feel like a genuine advantage.
On the other hand, buyers of newer homes expect A ratings. If a 2018 home rates lower, they’ll want to know why.
Pricing In Upgrades
When a home rates D or below, buyers often factor in the cost of insulation, windows or a heat pump. As a result, a lower BER can shape offers, especially when two similar homes compete.
That said, a low rating disclosed upfront rarely puts serious buyers off. Instead, surprises do the damage.
How Lenders Read a BER
Many Irish lenders now link mortgage pricing to the BER. Typically, a better rating can unlock a lower rate.
Green Mortgages
AIB’s green fixed rates, for example, require a rating of A1 to B3 on older certificates. On certificates under the new scale, the requirement is A0, A or B. Its GreenA rate goes further and requires an A.
Bank of Ireland takes a tiered approach instead. Its EcoSaver discounts apply across ratings from G to A, with the biggest discount for A-rated homes.
What This Means for Your Buyer
Lender criteria change, so buyers should always check the current terms. Nevertheless, the trend is clear: a B or better can make your home cheaper to finance. That gives your buyer more room in their budget.
The Local Picture in Lucan and Celbridge
Lucan and Celbridge both show the full range of the BER scale within a few kilometres.
Older Homes
Period homes around Lucan Village and Celbridge’s Main Street often sit in the E to G range. Likewise, mature estates in Esker and Castletown typically rate C or D unless owners have upgraded them.
Newer Homes
By contrast, homes in Adamstown, Ballyoulster and Simmonstown often carry A ratings. Meanwhile, 1990s and 2000s estates around Griffeen commonly rate C, with upgraded homes reaching B.
This mix fits the wider data. Kildare and Dublin County ranked among the top counties for A-rated BERs in the CSO’s Q1 2025 audit figures. That reflects the volume of newer homes in both counties.
Expert Guidance From Lorraine Mulligan
About Lorraine
Lorraine Mulligan leads Team Lorraine from offices in Lucan and Celbridge. She has worked as an estate agent for 27 years and has taken part in over 7,000 home sales.
Lorraine’s Advice on BER Ratings
Lorraine encourages sellers to read their BER in context. “A C on a 1990s semi is a perfectly respectable result,” she explains. “Buyers compare it with homes of the same age, not with a new build in Adamstown.”
Her advice is simple: know your letter before you price your home. Then, if an upgrade would move you into a better band cheaply, do it before your assessment.
Conclusion: Read Your BER in Context
A good BER rating is generally a B or better, and A0 marks the very top of the new scale. However, the right benchmark depends on your home’s age and type. A C is average for a 1980s or 1990s home, while D to G are typical of older properties.
Buyers and lenders both read the letter, so it pays to understand yours before you sell.
Book Your Free Valuation
Contact Lorraine Mulligan at Team Lorraine for a free, no-obligation valuation and an honest view of how your BER affects your price.
📞 +353 1 627 2770
📍 Main Street, Celbridge, Co Kildare
📍 Unit 2, Lower Main Street, Lucan, Co Dublin
Frequently Asked Questions
Is a C BER rating good?
A C rating is average, and for a home built between the late 1970s and mid-2000s it’s a fair result. In fact, the CSO found C to be the most common rating for homes built from 1978 to 2004. However, buyers of newer homes expect better, so context matters.
What is the difference between A0 and A on the new BER scale?
Both bands indicate a highly efficient home, but A0 adds a strict extra condition. Specifically, an A0 home must use no fossil fuels on site, so a gas boiler or solid-fuel stove disqualifies it. An A-rated home, by contrast, can still have one.
Does my old BER certificate still count after the scale change?
Yes, an existing certificate stays valid for ten years from its issue date and keeps its original rating, such as B2 or C1. Therefore, you can still use it to sell or rent. You only need a new one if it expires or you make significant changes to the home.
What BER rating do I need for a green mortgage?
It depends on the lender, but many use B as the minimum. For example, AIB’s green fixed rates require A1 to B3 on older certificates, or A0, A or B on new ones. Meanwhile, Bank of Ireland’s EcoSaver offers tiered discounts across all ratings.
Optimized by WP Lighthouse.