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Extension Planning Permission Checker

Answer five quick questions to see whether your extension is likely to be exempt from planning permission, may need checking, or will probably need an application.

  • Five quick questions
  • Based on the main exemption rules
  • Clear next steps
  • Links to builders and designers
Start the checker Get free quotes Call 083 056 8710

Emergency Trade is independent and not part of SEAI or any council. Always confirm details with the official source before applying.

About this checker

It's based on the main conditions for exempt rear extensions: total floor area of no more than 40 square metres, at least 25 square metres of garden left, and tighter limits for upstairs extensions and protected structures. The full rules are detailed, so always confirm with your council or a designer. See the full planning guide.

Extension Planning Permission Checker

Answer each question, then see your result.

A guide based on your answers, not professional advice.

Frequently asked questions

Is the result definite?

No. It's a guide based on the main rules. Confirm with your council or a designer, or ask for a Section 5 declaration.

What is a Section 5 declaration?

A formal decision from your council on whether a project needs planning permission.

Find vetted contractors for this work

By area:

  • North Dublin City: Artane, Cabra, Clontarf, Coolock, Drumcondra, East Wall, Fairview, Glasnevin, Phibsborough, Stoneybatter
  • Dún Laoghaire & South Coast: Blackrock, Booterstown, Monkstown, Dún Laoghaire, Dalkey, Killiney
  • Dublin North Coast: Raheny, Baldoyle, Donaghmede, Howth, Sutton, Portmarnock, Malahide
  • South West Dublin: Tallaght, Citywest, Firhouse, Knocklyon, Ballyboden, Templeogue, Walkinstown, Kimmage, Rathfarnham, Terenure
  • West Dublin & Leixlip: Chapelizod, Palmerstown, Lucan, Leixlip, Adamstown, Clondalkin
  • Dublin 15: Blanchardstown, Castleknock, Mulhuddart, Ongar, Hansfield, Ashtown
  • South Dublin City: Ballsbridge, Donnybrook, Sandymount, Ranelagh, Rathgar, Harold's Cross, Churchtown, Dundrum
  • Stillorgan, Sandyford & Foxrock: Mount Merrion, Stillorgan, Goatstown, Sandyford, Cherrywood, Cabinteely, Foxrock, Deansgrange
  • North County Dublin: Swords, Lusk, Rush, Skerries

Get free quotes from vetted contractors

Tell us what you're planning, where the property is and when you'd like to start. We'll match you with a vetted local contractor. For anything urgent, call 083 056 8710.

What do you need help with?

Please choose what you need help with.

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When are you hoping to start?

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Do you own the property?

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Urgent? Call 083 056 8710, the fastest way to reach us.

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Please tick to agree so we can pass your details to a contractor.

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We'll match you with a vetted local contractor and be in touch shortly.

For anything urgent, call 083 056 8710.