Ireland’s Building Energy Rating (BER) system is undergoing a major update from May 24th, 2026, bringing a simpler scale and a new top-tier category for zero‑emission homes. The change is part of a wider EU effort to make energy ratings clearer and more consistent across member states. Here’s what the update means for anyone buying, selling, renting or upgrading a home.

Why the BER System Is Being Updated

The current BER scale runs from A to G, but includes multiple sub‑categories (A1, A2, A3, B1, B2, etc.). Critics have long argued that the 15‑point scale is overly complex and difficult for the public to interpret.

Under the EU Energy Performance of Buildings Directive (EPBD), all member states are moving to a more streamlined system. Ireland is now aligning with this approach to make ratings easier to compare and understand.

What’s Changing?

From May 24th, the BER scale will shift to:

• A0 – new top category for zero‑emission homes
• A, B, C, D, E, F, G – eight simplified grades with no sub‑categories

The new A0 rating is reserved for homes with:

• exceptionally high energy performance
• no fossil‑fuel use
• zero operational emissions

This category is expected to become the benchmark for new‑build homes from 2030 onwards.

Will Existing BER Certificates Still Count?

Yes — and this is important for homeowners.

• All existing BER certs remain valid for 10 years from their date of issue.
• They will continue to meet legal requirements for selling or renting a property.
• No homeowner is required to update their BER because of the new scale.

Only when a homeowner requests a new BER after May 24th will the updated scale apply.

Why the Change Matters for the Property Market

Energy performance is increasingly influencing buyer behaviour, mortgage eligibility, and long‑term running costs. A clearer, more intuitive scale helps:

• Buyers quickly understand a home’s efficiency
• Sellers position upgraded homes more effectively
• Landlords meet regulatory obligations with less confusion
• New‑build developers benchmark against future A0 standards

The shift also supports Ireland’s broader climate commitments by encouraging higher‑performing homes.

What About BER Activity in Ireland?

Demand for BER assessments has been rising sharply:

• 47% increase in BER audits in 2022
• Q4 2025 recorded the highest number of audits ever

This reflects growing interest in energy upgrades, retrofitting grants, and the role of BERs in property transactions.

What Homeowners Should Do Now

You don’t need to take any action unless you’re planning to:

• Sell or rent your property soon
• Apply for grants that require an updated BER
• Complete upgrades and want to reflect them in a new rating

If your current BER is still within its 10‑year validity window, it remains fully compliant.

In Summary

Ireland’s BER overhaul is designed to make energy ratings clearer and more future‑focused. The introduction of A0 sets a new standard for zero‑emission homes, while the simplified scale removes confusion for buyers and sellers. Existing certificates remain valid, ensuring minimal disruption for households.