Attic Conversion Cost Calculator
Most attic conversions in Dublin cost between €25,000 and €80,000, depending on the type. A simple Velux conversion is the cheapest; dormers and hip-to-gable conversions add more headroom and cost more. Use the calculator for an estimate.
- Velux from about €25,000
- Dormer €40,000–€70,000
- Hip-to-gable €50,000–€80,000
- Free quotes from vetted specialists
Types of attic conversion
| Type | Typical cost | Best for |
|---|---|---|
| Velux (rooflight) | €25,000–€45,000 | Attics with good existing headroom |
| Dormer | €40,000–€70,000 | Adding headroom and floor space |
| Hip-to-gable | €50,000–€80,000 | Semi-detached and end-of-terrace homes with hipped roofs |
| Mansard | €60,000–€100,000 | Maximum space, usually needs planning |
Cost calculator
Get a guide range based on typical 2026 Dublin prices.
A guide only. Your quote will depend on your property, access and the specification you choose.
Habitable room or storage?
To be used as a bedroom, an attic must meet Building Regulations for a habitable room, including head height, fire safety and stairs. Many attics only qualify as storage without bigger changes, such as a dormer. A specialist will tell you which applies to your attic.
Planning permission
Velux conversions with rooflights to the rear are often exempt. Dormers, especially to the front, usually need planning permission. See our planning guides.
Frequently asked questions
How much does an attic conversion cost in Dublin?
Typically €25,000–€80,000, depending on the type, with mansard conversions costing more.
Can my attic become a bedroom?
Only if it meets Building Regulations for a habitable room, including head height, fire safety and stairs.
Do I need planning permission for an attic conversion?
Not always. Rear rooflights are often exempt, but dormers usually need permission.
How long does an attic conversion take?
Usually 4–8 weeks on site, depending on the type.
Find vetted contractors for this work
By area:
- Dún Laoghaire & South Coast: Blackrock, Booterstown, Monkstown, Dún Laoghaire, Dalkey, Killiney
- South Dublin City: Ballsbridge, Donnybrook, Sandymount, Ranelagh, Rathgar, Harold's Cross, Churchtown, Dundrum
- North Dublin City: Artane, Cabra, Clontarf, Coolock, Drumcondra, East Wall, Fairview, Glasnevin, Phibsborough, Stoneybatter
- West Dublin & Leixlip: Chapelizod, Palmerstown, Lucan, Leixlip, Adamstown, Clondalkin
- North County Dublin: Swords, Lusk, Rush, Skerries
- Dublin 15: Blanchardstown, Castleknock, Mulhuddart, Ongar, Hansfield, Ashtown
- Dublin North Coast: Raheny, Baldoyle, Donaghmede, Howth, Sutton, Portmarnock, Malahide
- Stillorgan, Sandyford & Foxrock: Mount Merrion, Stillorgan, Goatstown, Sandyford, Cherrywood, Cabinteely, Foxrock, Deansgrange
- South West Dublin: Tallaght, Citywest, Firhouse, Knocklyon, Ballyboden, Templeogue, Walkinstown, Kimmage, Rathfarnham, Terenure
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.
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