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Ireland’s simplified Building Energy Rating (BER) system is now officially live, representing one of the most significant changes to energy certification in recent years.
Introduced by the Department of Housing, Local Government and Heritage and administered by SEAI, the revised system replaces the previous 15-category BER structure (A1–A3, B1–B3 etc.) with a simplified 8-band scale ranging from A0 to G.
The reform is intended to improve clarity for consumers, purchasers and tenants, while also aligning Ireland more closely with the revised EU Energy Performance of Buildings Directive (EPBD). Under the new approach, the additional subcategories have been removed, making BER certificates easier to interpret and compare across the market. A new A0 rating has also been introduced as the highest-performing category, reflecting buildings with exceptionally low emissions and very high energy performance, typically operating without fossil fuel heating systems.
Alongside the revised BER scale, updates have also been introduced to the Primary Energy Factor (PEF) for electricity. The PEF is a key calculation used within BER and Part L methodologies to reflect the upstream energy associated with electricity generation. The reduction in the electricity PEF reflects the continued decarbonisation of Ireland’s electricity grid as renewable generation increases nationally. In practical terms, this means electrically powered buildings – particularly those using heat pumps and other efficient electric systems – will increasingly benefit from Ireland’s cleaner electricity mix within energy calculations.
The combined changes represent another important step in Ireland’s transition toward lower-carbon buildings and align with the broader EU policy direction of electrification, improved building performance and reduced operational emissions. The updated BER framework is expected to support clearer communication of energy performance to building owners, occupiers and investors, while also reinforcing the growing importance of high-performance building design across the construction sector.