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Planning & Law6 min readBy New Chapter Homes

Do Modular Homes Need Planning Permission in Ireland? The 2025 Rules Explained

Do you need planning permission for a modular home or garden room in Ireland? The 2026 rules explained — exemptions, sizes, and when you need to apply. Clear guidance from New Chapter Homes.

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Do Modular Homes Need Planning Permission in Ireland? The 2025 Rules Explained — Planning & Law article by New Chapter Homes Ireland

Looking for the full picture? Read our planning permission guide.

Do Modular Homes Need Planning Permission in Ireland?

The answer depends on the size, location, and intended use of the structure. The short version:

  • Small garden rooms (up to 30m²) at the rear — generally exempt as ancillary garden structures.
  • Rear extensions up to 40m² — generally exempt.
  • Garden dwellings (32–45m²) under the Class 3A exemption (from July 2026) — exempt with conditions.
  • Standalone dwellings / homes — full planning permission required.

Garden Room Planning Exemptions (2026)

Under current Irish planning regulations, a garden room or garden building is generally exempt from planning permission if:

  1. It's at the rear of the house (not visible from the road).
  2. The floor area is 30m² or less (or 40m² for an extension).
  3. It's not used as self-contained living accommodation (i.e., not a separate dwelling with its own kitchen and bathroom for someone to live in independently).
  4. The height doesn't exceed limits (typically 4m for a pitched roof, 3m for a flat roof).
  5. It doesn't reduce the remaining garden area to less than 25m².

When You DO Need Planning Permission

You'll need planning permission if:

  • The structure is over 30m² (or the cumulative exempt area is exceeded).
  • It will be used as a separate dwelling (self-contained living accommodation).
  • It's visible from a public road.
  • The site is in a protected structure or conservation area.
  • The property is an apartment (different rules apply).

The Class 3A Garden Dwelling Exemption (from July 2026)

S.I. No. 340 of 2026 introduced a new exemption for garden dwellings of 32–45m² intended for a family member (e.g., an older relative). Strict conditions apply — including that the dwelling must be for a member of the household, not for rent, and must be connected to the main house's services. Our team can advise on whether this applies to you.

Standalone Modular Homes

A standalone modular home (a complete house on its own plot) always requires full planning permission — just like a traditional house. This includes:

  • A site with its own access.
  • Connection to water and wastewater.
  • Compliance with building regulations (BCAR).
  • A BER certificate.

New Chapter Homes can manage the entire planning application process for you.

How We Help

  • Free assessment — we review your site and advise on planning requirements.
  • Planning application — we prepare and submit the application.
  • Building regulations — our homes are BCAR-compliant as standard.
  • BER certification — every home comes with a full energy rating.

See our full planning guide, or contact us for a free assessment of your site.

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