What is a BER Certificate?

A BER (Building Energy Rating) certificate shows how energy efficient a property is, on a scale from A0 to G. A0 rated homes are the most energy efficient and G rated homes are the least. A BER is carried out by an SEAI registered BER assessor, and by law you need one to sell or rent a property in Ireland.

What Does a BER Measure?

A BER calculates the energy a home needs each year for heating, hot water, ventilation and lighting, per square metre of floor area (kWh/m²/yr). It also shows the carbon emissions linked to that energy use.

A BER is based on the building itself, not on how many people live there or how they use their heating. This means buyers and tenants can compare one property with another.

The BER Scale (A0 to G)

Since 24 May 2026, the BER scale has 8 ratings: A0, A, B, C, D, E, F and G. The previous scale had 15 ratings, including sub-categories like B1, B2 and C3.

A0 is the highest rating and is only for buildings that don't use fossil fuels, so a home heated by a gas or oil boiler can't get an A0. G rated homes are the least energy efficient and are usually older properties that cost more to heat.

BER certificates issued before 24 May 2026 show the old scale and are still valid for 10 years from their date of issue.

What Do You Get With a BER?

Every BER comes with:

• A BER certificate showing your property's rating, energy use and carbon emissions (see a sample BER certificate)
• An advisory report with recommendations on how to improve your property's energy efficiency

Your BER is also published on the SEAI National BER Register, where it can be looked up using the BER number or the property's MPRN number.

How is a BER Calculated?

Your BER assessor visits the property and records its size, age and construction, insulation, windows and doors, heating and hot water system, ventilation, lighting and any renewable energy systems. This information is entered into the SEAI-approved DEAP software, which calculates the BER.

Why Does Your BER Matter?

The better your BER, the more energy efficient your home is. A home with a good BER is generally warmer, cheaper to run and has lower carbon emissions, which also makes it more attractive to buyers and tenants.

Get Your BER Quotes Today

Ready to book your BER assessment? Compare quotes from trusted, SEAI-registered BER assessors in your area. Requesting quotes is free, and will save you money.

Get BER Quotes