An attic conversion is one of the most cost-effective ways to add space and value to your Dublin home. But how much does it actually cost in 2026? And what type of conversion is right for your property?
This guide breaks down the full cost of attic conversions in Dublin — from basic Velux conversions to full dormer builds — so you know exactly what to expect before you get a quote.
Attic Conversion Costs in Dublin 2026
Prices vary depending on the type of conversion, the size of your attic and the level of finish required. Here are the typical price ranges in Dublin:
| Conversion Type | Typical Cost |
|---|---|
| Velux / Rooflight Conversion | €15,000 – €22,000 |
| Dormer Attic Conversion | €25,000 – €40,000 |
| Hip-to-Gable Conversion | €30,000 – €50,000 |
| Full Mansard Conversion | €40,000 – €65,000 |
| Garage + Attic Combined | €45,000 – €70,000 |
💡 Good news: A well-executed attic conversion typically adds 15–20% to the value of a Dublin property — often more than the cost of the conversion itself.
Types of Attic Conversion Explained
Velux Conversion
The most affordable option. Velux roof windows are installed into the existing roof slope — no structural changes to the roofline. Ideal for homes with good head height. Best suited for a home office, guest room or storage room with natural light.
Dormer Attic Conversion
The most popular choice in Dublin. A dormer extends out from the existing roof, creating a box-shaped structure that significantly increases headroom and floor space. Can add a full bedroom with en-suite. Most semi-detached and terraced Dublin homes are suitable for a dormer.
Hip-to-Gable Conversion
Converts the sloped hip end of a roof into a vertical gable wall, creating considerably more internal space. Common on detached and end-of-terrace properties. Often combined with a rear dormer for maximum space.
Mansard Conversion
The most extensive conversion — alters the entire roof structure to create a near-vertical rear wall with a flat roof. Maximum space but highest cost. More common in city centre period properties.
What's Included in the Price?
A full attic conversion quotation from a reputable Dublin contractor should include:
- Structural engineer assessment and drawings
- Planning permission application (if required)
- All structural steelwork and carpentry
- Insulation — roof, walls and floor
- Plastering and dry-lining
- Electrical first and second fix
- Staircase design and installation
- Windows and roof lights
- Flooring preparation
⚠️ Watch out for: Quotes that exclude structural engineering, planning or electrics. Always ask for a fully itemised quote so you're comparing like for like.
Do I Need Planning Permission?
In most cases, attic conversions in Dublin fall under exempted development — meaning you don't need full planning permission as long as the work meets certain criteria.
You typically don't need planning permission if:
- The floor area added is under 40 sq metres
- No part of the conversion is visible from the front of the property
- The roof height is not increased
A hip-to-gable or mansard conversion may require planning permission. Your contractor should advise you on this during the initial survey.
How Long Does an Attic Conversion Take?
| Conversion Type | Typical Duration |
|---|---|
| Velux Conversion | 3 – 5 weeks |
| Dormer Conversion | 6 – 10 weeks |
| Hip-to-Gable | 8 – 12 weeks |
| Mansard | 12 – 16 weeks |
How Much Value Does an Attic Conversion Add?
In the Dublin market, adding a bedroom through an attic conversion typically adds €40,000 to €80,000 to the value of a property depending on location and specification. In areas like Rathmines, Ranelagh, Clontarf and Blackrock, the uplift can be even higher.
For most Dublin homeowners, the return on investment is clear — particularly for growing families who need the space and don't want the cost and disruption of moving.
Frequently Asked Questions
Is my attic suitable for conversion?
Most Dublin homes built before the 1990s are suitable. Key factors are head height (ideally 2.2m+ at the ridge), roof pitch and the condition of existing timbers. A free survey will confirm suitability quickly.
Can I use my attic conversion as a bedroom?
Yes — provided the conversion meets building regulations for ventilation, insulation, fire safety and means of escape. A properly converted attic can be used as a bedroom, en-suite, home office or playroom.
Do I need to move out during the conversion?
In most cases no. Attic conversions are carried out from above and cause minimal disruption to the rest of the house. You may need to vacate during specific stages such as structural steel installation.
What's the difference between a loft conversion and an attic conversion?
They're the same thing — "loft conversion" is the term more commonly used in the UK, while "attic conversion" is the standard term in Ireland. Both refer to converting unused roof space into a habitable room.
Get a Free Quote for Your Dublin Attic
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