How much does an attic conversion cost in Ireland?

In 2026, a standard Velux attic conversion in Ireland costs between €18,000 and €26,000. A dormer attic conversion or one containing an ensuite bathroom typically costs between €30,000 and €45,000, depending on structural engineering, plumbing requirements, and the roof type.

Do I need planning permission for an attic conversion in Ireland?

You do not need planning permission for a standard attic conversion in Ireland with roof-level windows (like Velux) at the rear or side. However, you will need planning permission if you want to install a dormer window, or if you want to place Velux windows on the front roof slope facing the public road.

Does an attic conversion qualify as a habitable room?

To qualify legally as a habitable room (like a bedroom) under Irish Building Regulations, an attic conversion must have a floor-to-ceiling height of at least 2.4 metres over at least 50% of the floor area. It must also have a permanent, regulation-compliant staircase (Part K) and meet strict fire safety escape rules (Part B).

How long does a standard attic conversion take to build?

A standard Velux attic conversion typically takes 2 to 3 weeks to complete. A larger dormer conversion or a conversion containing an ensuite toilet and shower usually takes 4 to 6 weeks. The work involves joist reinforcement, steel beam installation, insulation, stairs, plastering, and electrical work.

What is the difference between truss roofs and traditional rafter roofs for conversions?

Traditional rafter roofs (built pre-1980s) have open space and are easier and cheaper to convert. Modern truss roofs (built with W-shaped pre-fabricated timbers) fill the attic space. Converting a truss roof requires significant structural engineering and steel support beams to cut away the trusses safely.

Can I install a bathroom or ensuite in my attic conversion?

Yes, you can install an ensuite toilet, shower, and sink in your attic conversion. This requires plumbing extensions from the floor below and the installation of a soil pipe or a macerator pump (like a Saniflo). It is highly recommended to plan this before commencing structural work.

What are the fire safety regulations for attic conversions in Ireland?

Under Part B of the Building Regulations, a converted attic must have a 30-minute fire-resistant partition, fire doors on all rooms along the escape route, interconnected mains-powered smoke alarms in the hallway and attic, and a fire-safe window with an opening of at least 850mm x 500mm for rescue access.

How do I find verified attic conversion specialists?

You can find local, verified attic conversion specialists in Ireland on BuildTrade.ie. We vet all listed contractors to verify their CRO company registration, public liability insurance, and trace records, ensuring your conversion is structurally sound and compliant.

Attic Conversion Specialists in Ireland

Looking for the best attic conversion specialists in Ireland to unlock the hidden space in your roof? Converting your attic is one of the most efficient and cost-effective ways to add a home office, an extra bedroom, or a playroom without sacrificing your garden. At BuildTrade.ie, we connect you with vetted, fully insured, and highly experienced attic conversion specialists in Ireland who build premium-quality room conversions. All our local partners are checked against CRO records and public liability registers to guarantee structural integrity and safety. Whether you require a standard roof window conversion or a dormer attic conversion, our professionals ensure strict compliance with Irish Building Regulations (specifically Part B for fire safety and Part K for stairs). Compare free quotes from trusted local attic conversion experts near you in Ireland today.

Building Regs

Compliant Conversions

€20,000 - €38,000

Average Cost Range

3 - 5 Weeks

Typical Build Time

Velux & Dormer

Bespoke Styles

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What is Attic Conversions?

An attic conversion is the process of transforming an unused roof space into a habitable room, which involves structural reinforcement of the ceiling joists, installing steel support beams, fitting roof windows or a dormer window, and building a permanent staircase.

How Much Does Attic Conversions Cost in Ireland?

Here are typical price ranges and baseline estimates for attic conversions in Ireland.

Attic Style	Typical Work Scope	Estimated Cost	Duration	Steel Beams Included
Standard Velux (Storage/Playroom)	2x Velux windows, floor joist upgrade, basic stairs	€18,000 - €24,000	2 - 3 Weeks	Yes
Standard 2-Bed Velux (Habitable Room)	Meets Part B & K regulations, custom timber stairs	€24,000 - €32,000	3 - 4 Weeks	Yes
Dormer Conversion (Max Space)	Flat-roof dormer window structure, custom timber stairs	€32,000 - €45,000	4 - 5 Weeks	Yes
Ensuite Attic Conversion	Attic room with toilet, shower, sink, and plumbing works	€28,000 - €38,000	4 - 6 Weeks	Yes

* Costs are baseline estimates for 2026. Actual quotes vary based on roof structure (trusses vs purlins) and stairwell complexity.

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External Wall Insulation Home Retrofit General Builders ICF Construction

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