Porch and garage conversion planning permission — 99% of garage conversions granted

Garage conversions are the safest application on the Dublin registers. The seven Greater Dublin Area councils we index decided 88 of them in the 12 months to 12 September 2026 and granted 87, a 99% rate. Porches ran at 95%: 211 granted, 11 refused. Both figures cover applications that named the works, and both understate how often the works happen, because a porch under 2 m² and the inside of a garage are exempted development. The application is needed when the porch is bigger, the garage gets a new front, or the car has nowhere else to go.

Porches: the 2 m² rule

Class 7 of Schedule 2, Part 1 of the Planning and Development Regulations 2001 exempts a porch at the front or side of a house if its floor area is 2 m² or less, it stands at least 2 m from any road, and its height is no more than 4 m with a tiled or slated pitched roof or 3 m with any other roof. All three conditions apply together. A porch of 2.4 m² is not exempt because it is small; it is an application.

Most Dublin porches are around 3 m² by the time the wall thickness and a step are drawn, which is why 222 of them reached a decision in the year. A porch that matches the house and does not push past the building line of the terrace is granted almost every time. The 11 refusals we read were mostly porches wrapped into a larger scheme: a front extension, a widened driveway, a first-floor room over the porch. The porch was not the problem. Fingal refused a scheme at Balbriggan Road, Skerries on 20 August 2026 that began with the demolition of an existing porch and went on to a good deal more.

Garage conversions: inside is exempt, the front is not

Turning the inside of an attached garage into a playroom, a home office or a bedroom is internal work under s.4(1)(h) of the Planning and Development Act 2000, as long as the outside does not change. Replace the up-and-over door with a window and a panel of matching brick and most councils still call it exempt, because the character of the house is not materially affected. Put in a bay window, a front door or a new porch and the exemption is gone.

Two things move a garage conversion onto the register. The first is a detached garage, which is a separate structure: converting it to living space is a change of use, and if it becomes a dwelling it is a new house. The second is a conversion bundled with an extension. Dublin City refused a scheme at 38 Dartry Road on 27 July 2026 that combined a garage conversion with a two-storey rear extension and a dormer; the garage was the least of it.

The parking condition

Every garage conversion removes an off-street parking space, and the development plan cares. Dublin City's Appendix 5 and the Dún Laoghaire-Rathdown and Fingal plans all expect a house in a suburban estate to keep at least one space. Where the garage fronted a driveway long enough for a car, the planner is content. Where the driveway is the garage, the grant will carry a condition, or the application will come back with a further information (FI) request asking where the car goes. Widen the vehicular entrance if you have to; in Dublin City an entrance up to 3.5 m wide is exempt under Class 9 if it is not onto a protected road, and the kerb dish is a separate application to the roads section.

Fire and building control

A garage bedroom is a habitable room, and the Building Regulations apply to it whether or not planning did. The garage floor is usually below the house floor and uninsulated, so Part L (insulation) and Part C (damp) drive the cost; a bedroom needs an escape window under Part B. A material alteration needs a commencement notice through the Building Control Management System (BCMS) 14 days before you start. The domestic opt-out from the certificate of compliance under the 2014 Regulations applies; the notice still does.

Our reading

Convert the inside of the garage and keep the door opening the same size, and you have no planning to do. Apply the moment the drawings show a new front elevation, a room over, or a second front door, and show the parking on the site plan before the council asks. For a porch, draw it at 1.9 m² if you possibly can. The €34 fee is trivial; the eight weeks and the site notice are not.

Check the street

Open the Explorer on your address and search the applications tab for "porch" or "garage". The Dublin City place page shows the council's live small-works figures.

Figures from the register on 12 September 2026 (live callouts refresh hourly); law checked 12 September 2026. Check with the council or a planning consultant before relying on this.

Frequently asked questions

Do I need planning permission for a porch in Ireland?

Not if it is 2 m² or less, at least 2 m from the road, and no more than 4 m high with a pitched tiled roof or 3 m with a flat one (Class 7 of the 2001 Regulations). Anything larger is an application for €34; 95% of porch applications in Dublin were granted in the past year.

Do I need planning permission to convert a garage?

Internal works to an attached garage are exempt under s.4(1)(h) of the 2000 Act if the front does not materially change. A new window in the old door opening is usually accepted; a new front elevation, a room above, or a detached garage becoming living space needs an application.

Will the council let me lose my parking space?

Usually, if a car still fits on the driveway. Where it does not, expect a condition or a further information request about parking. Dublin City's development plan expects a suburban house to keep one off-street space.

Can I sell a house with an unauthorised porch?

The buyer's solicitor will ask for planning evidence for every change since 1 October 1964. A porch a few centimetres over 2 m² is the classic case for an architect's opinion on exemption, or a retention application at three times the fee.

How long does a porch or garage application take?

Eight weeks from a valid application if the council asks no further information; the register median for all house applications across the seven councils is 53 days.