NZEB & BER Ratings for Modular Homes Ireland: 2025 Energy Standards
Since 2025, all new Irish homes — including modular — must meet NZEB standards (BER A2 or better). Here's what NZEB means, how it affects your modular build, and how we exceed it.

Looking for the full picture? Read our complete guide to modular homes in Ireland.
What Is NZEB and Why Does It Matter for Modular Homes?
NZEB (Nearly Zero Energy Building) is the energy performance standard mandated by the EU and transposed into Irish law. Since 1 November 2025, all new dwellings in Ireland — including modular homes — must achieve a BER of A2 or better under the updated Part L of the Building Regulations.
This is a significant raising of the bar. Previously, the threshold was looser. Now, every new home must be designed to use almost no net energy, with the small amount of energy it does consume coming substantially from renewable sources.
What NZEB Means in Practice
To meet NZEB / BER A2, a modular home must achieve:
- A primary energy consumption of no more than 75 kWh/m²/year (previously ~150+).
- A renewable energy ratio of at least 20% of total energy use.
- U-values for walls, roof, and floors that are significantly better than older builds.
- Airtightness of 5 m³/(h·m²) or better at 50 Pa.
- Mechanical ventilation with heat recovery (MVHR) in most cases.
- Heat pump as the primary heating source (gas and oil boilers no longer comply for new builds).
How Modular Construction Excels at NZEB
Modular homes are uniquely suited to meeting NZEB standards because:
- Factory-controlled insulation — every panel is insulated in a dry, controlled environment with no gaps or compression.
- Superior airtightness — factory-built modules have tighter joints and fewer thermal bridges than site-built homes.
- Consistent quality — no weather damage to insulation during construction.
- Heat pump ready — our designs integrate heat pumps as standard.
The 2025 Heat Pump Mandate
A major legislative change: since 2025, all new Irish dwellings must use a heat pump or equivalent renewable heating system as the primary heat source. Fossil fuel boilers (gas, oil) are no longer permitted as the primary heating system in new builds. This applies to modular homes equally.
Every New Chapter Homes build includes an air-to-water heat pump as standard, integrated into the factory build — so you're compliant from day one.
BER Certification for Modular Homes
Your modular home will receive a BER certificate upon completion, just like a traditional build. Our homes typically achieve A2 or A1 ratings, placing them in the top tier of Irish housing stock. This matters for:
- Mortgage approval — lenders increasingly require strong BER ratings.
- Running costs — an A2 home costs roughly €400–€700/year less to heat than a C-rated home.
- Resale value — energy-efficient homes command higher prices.
NZEB and the Retrofit Exemption
If you're adding a modular extension or pod to an existing home, the existing dwelling does not need to be retrofitted to NZEB — only the new construction must meet the standard. However, there are grants available under the National Retrofit Scheme to upgrade the main house if you choose.
Contact New Chapter Homes to learn how our modular homes exceed NZEB standards straight from the factory.
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