Zero-emission buildings are now written into Irish law. Here is what the standard requires, how the renovation thresholds work, and who needs to care about the dates.
Last updated: June 2026 · 7 min read
If you have looked at a BER certificate issued since 24 May 2026, you will have noticed two terms that did not exist in the Irish system before: ZEB and ZEB Renovate. Both arrived with the European Union (Energy Performance of Buildings) Regulations 2026, and both are going to shape how commercial buildings are built, renovated, valued and let over the next decade. Here is what they actually mean.
A zero-emission building, or ZEB, is defined in the new regulations as a building with a very high energy performance that meets three tests at once. It requires zero or a very low amount of energy to run. It produces zero on-site carbon emissions from fossil fuels. And its operational greenhouse gas emissions are zero or very low, within thresholds set nationally.
In practical terms, a ZEB is a building with an excellent fabric and services specification and no oil or gas plant on site. Heating and hot water come from heat pumps, district heating or other non-fossil sources, usually supported by renewables such as rooftop solar. On the new BER scale, the very best of these buildings earn the new A0 rating.
For the past several years, new Irish buildings have been designed to the nearly zero-energy building standard, NZEB. Under the recast EU directive, ZEB is the successor to NZEB as the standard for new buildings. The 2026 BER Regulations introduce the ZEB concept into the rating system now, with the building-regulation requirements that will make it mandatory for new buildings still to be transposed.
Two dates are already fixed by the directive. From 1 January 2028, all new buildings owned by public bodies must be zero-emission buildings. From 1 January 2030, the requirement extends to all new buildings.
Holding a 1980s office block to the same standard as a new build would be neither fair nor achievable, and the regulations recognise that. ZEB Renovate applies the zero-emission concept to renovated buildings, with separate, differentiated thresholds.
For non-domestic buildings, a schedule to the regulations sets out total primary energy thresholds in kWh per square metre per year, both for each BER class and for ZEB Renovate, across a range of building types such as offices, hotels and schools. A renovated office is measured against the office thresholds, a hotel against the hotel thresholds, and so on. The purpose is to give owners of existing stock a realistic, cost-effective renovation target that still delivers the substance of the zero-emission standard.
Public bodies are first in the queue. The ZEB Renovate thresholds were introduced partly to support the renovation of public sector buildings to the most cost-effective standard, and the 2028 deadline for new public buildings is now under two years away.
Developers and anyone planning a new commercial building should be designing with 2030 in mind today. A building receiving planning permission now will be completed into a market where zero-emission is the legal baseline for its newest competitors.
Owners and landlords of existing buildings are not under an immediate legal obligation to renovate. But the direction of travel is unmistakable: minimum energy performance standards for the worst-performing non-residential buildings are part of the same directive and are still being transposed. Buildings far below the thresholds will increasingly face questions from lenders, insurers and larger tenants long before any legal deadline bites.
Anyone renovating should know where their building stands against its ZEB Renovate threshold before work starts, not after. Sequencing the works correctly is usually the difference between an upgrade that moves the rating meaningfully and one that does not.
The arrival of ZEB does not change your current certificate. Existing BERs remain valid for ten years from issue, and the new scale maps your building's performance rather than re-measuring it. What changes is the context: every certificate issued from now on shows where a building sits relative to a zero-emission future, and the market can see it.
If you want to know exactly where your building stands against the new thresholds for its type, and what it would take to move it, that is precisely what our assessments and advisory reports are for. For a personalised, phased plan before you commit to anything, there is also the BER Improvement Roadmap.
A commercial BER assessment gives you your rating on the new scale plus an advisory report on the upgrades that would move it. Nationwide, fast turnaround.
Callback with your quote within 24 hours
We'll call you back with your free quote within 24 hours.
Urgent? info@commercialber.ie