The scale changed on 24 May 2026. New certificates use A0, A, B, C, D, E, F and G. Existing certificates remain valid for up to ten years unless a material change affects performance. Read SEAI’s scale update.
What a BER measures
SEAI’s Dwelling Energy Assessment Procedure calculates energy performance and carbon emissions for space and water heating, ventilation and lighting under standardised occupancy. A registered assessor uses property evidence and survey data. See the DEAP methodology overview.
What a BER does not tell you
- Your exact annual bill or tariff.
- How warm occupants choose to keep the home.
- The physical condition of the roof, structure or services.
- Whether every recommended upgrade is technically or financially suitable.
Use a condition survey for defects and an itemised upgrade assessment for investment decisions.
How to use a BER when buying or renting
- Check the certificate on the National BER Register using its number or the MPRN.
- Read the advisory report, not only the letter.
- Look for default assumptions caused by missing evidence.
- Ask about heating controls, ventilation, bills and upgrades completed since assessment.
- Check whether material changes could affect validity.
SEAI says sale and rental advertisements must display a valid BER, subject to exemptions. See BER sale and rental requirements.
Primary sources
- SEAI: New simplified BER scale, accessed 11 July 2026.
- SEAI: Get a BER assessment, accessed 11 July 2026.
- SEAI: BER sales and rental guidelines, accessed 11 July 2026.
Update triggers: BER regulations, scale, methodology or validity rules.