Planning permission for a new house in Ireland

Do you need planning permission for a new house?

Yes. Section 32 of the Planning and Development Act 2000 says permission is needed for any development that is not exempted development. A new house does not fall into the list of exemptions in Schedule 2 to the Planning and Development Regulations 2001.

There is one narrow exception. Class 3A, in force since 27 July 2026, allows a detached house in the rear garden of a principal house. It is limited to 32 to 45 square metres, must be occupied with the main house, and cannot be sold separately. See the garden room and granny flat guide.

What councils look at

Every site is different. Councils usually weigh the following.

• Zoning: the development plan says what each area can be used for. A site zoned for something other than housing is hard to win.
• Local policy: the plan sets rules on location, density, design and, in the countryside, who can build.
• Access and road safety: the entrance must be safe, with good visibility and no extra traffic hazard.
• Water and wastewater: the house needs a safe water supply and a way to treat wastewater, either a public connection or an on-site system.
• Flood risk: councils check flood maps and may refuse or limit building in flood zones.
• Nature and heritage: sites near Natura 2000 areas, protected structures, monuments or protected views get extra scrutiny.
• Neighbours and design: privacy, overlooking, loss of light, height and materials.

A one-off house in the countryside

Rural housing policy differs between councils. Many ask for a “local need” and look at the character of the landscape. National rural housing policy is being revised, so check your council’s current development plan and ask what applies now. Do not rely on older online articles.

Rural sites also tend to need:

• A site suitability assessment for on-site wastewater. S.I. 340 of 2026 refers to the EPA Code of Practice for Domestic Waste Water Treatment Systems, which sets national standards.
• Proof that the entrance and road are safe.
• Proof of a water source, or a connection to a public or group scheme.

A new house on an urban site

Urban applications often focus on zoning, density, layout, parking, privacy and the effect on neighbours. Infill sites and gardens split from an existing house are checked closely. Check if the site has legal access and services.

Costs and fees

The national planning fee is €65 for the provision of a house. Retention permission is €195, or €2.50 for each square metre of gross floor space for which permission is sought, whichever is the greater. Use the planning fee calculator for the exact figure.

The council fee is small beside the other costs. Plan for an architect or designer, a site survey, a site suitability assessment for wastewater (rural), traffic or flood reports where needed, and newspaper and site notices. Councils can also charge development contributions. Ask your council for current rates.

What counts against you

Common reasons for refusal include:

• The site is outside an area zoned for housing, or breaks rural housing policy.
• The entrance is unsafe or the visibility is poor.
• The site cannot treat wastewater safely.
• The design is out of character with the area.
• The house causes overlooking or loss of light to neighbours.
• The site is in a flood zone or near a protected nature site.

Read the decisions on similar sites in planning applications. They show how your council applied its policy.

Checklist before you apply

• Is the site zoned for housing, or does rural policy allow a house?
• Do you own the site, or have the owner’s written consent?
• Is there safe vehicle access with good visibility?
• Is there a public sewer, or a site that passes wastewater tests?
• Is there a water supply?
• Is the site outside flood zones, or has flood risk been addressed?
• Is it near a protected structure, monument or nature site?
• Has an earlier permission or planning history affected the site?

Next steps

Ask the council for a pre-planning meeting. These meetings come from section 247 of the 2000 Act. Dún Laoghaire-Rathdown, for example, describes its service as free, and says it is open only to people with a legal interest in the site. The advice does not grant permission.

When you are ready, read how to apply and how long planning permission takes. If the decision goes against you, see appeal a planning decision.

The law is changing

The Planning and Development Act 2024 is being brought into force in stages. The 2000 Act and the 2001 Regulations still set the exemptions, and the July 2026 amendments were made under the 2000 Act. National rural housing policy is also being revised. Check the Department of Housing’s website for which parts are in force.

Check before you build

Whether a house can go on a site depends on the exact location, its zoning and its planning history. A pre-planning report checks zoning, protected structures and nature sites at an address, so you can see the main limits before you spend on design. Use the pre-planning report or the planning permission checker. Then confirm with your council.