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Do I need planning permission for a tiny house in Ireland?

Yes, if it is used as a dwelling. A tiny house used for living accommodation is assessed as a house under the Planning and Development Act 2000 regardless of its small footprint, so it needs planning permission unless it is genuinely mobile and used only as a caravan under the relevant exemption.

There is no reduced planning threshold for small houses — a compact dwelling with a bedroom, bathroom and kitchen used as someone's home is a house for planning purposes, and it needs planning permission in the same way as any other new dwelling, however efficiently it is designed or however small its footprint.

The relevant exception is if the structure is genuinely a caravan or mobile home in the legal sense — built on a chassis, readily movable, and not permanently fixed to the land — since caravans used on a temporary or occasional basis can fall within specific exemptions or licensing arrangements rather than needing planning permission as a dwelling. A tiny house on wheels that is in practice sited permanently and connected to services is unlikely to be treated as a genuine caravan by a planning authority.

Where a tiny house is intended as a permanent home, the application will need to address the same core issues as any rural or urban dwelling, including wastewater treatment, water supply, access, and compliance with the local development plan and any relevant rural housing policy.

Key questions before building a tiny house

Work through the following:

  • Is it intended as a permanent home or a genuinely mobile, occasional-use structure?
  • Is it built on a chassis and readily capable of being moved, or effectively fixed in place?
  • Will it be connected to permanent water and wastewater services?
  • Does the site meet the local authority's rural housing or local needs policy, if in the countryside?
  • Has a wastewater treatment system been assessed as suitable for the site?
  • Does the design comply with Building Regulations for a habitable dwelling?

Framing a tiny house as a caravan purely to avoid planning permission is a high-risk strategy, since local authorities look at how a structure is actually used, not just its marketing description.

Getting a definitive answer

If there is genuine uncertainty about whether a specific structure would be treated as a caravan or as a house, apply for a section 5 declaration from the local authority before committing to the purchase or build.

Sources

Last reviewed 20 August 2026. General information only — not legal or planning advice.

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