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The Attic Experts specialise in attic conversions across Dublin, Kildare, and surrounding areas. From velux bedrooms to full dormer extensions, every project is custom-built by fully qualified tradesmen.
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Get ListedAn attic conversion is one of the most practical and cost-effective ways to add extra living space to your Irish home. Whether you need an extra bedroom, a home office, or a playroom, converting your loft utilizes the existing structure of your house without reducing your garden footprint. However, planning a successful conversion requires understanding construction costs, building regulations, and structural suitability.
Before starting construction, a structural engineer or builder must assess if your attic space is suitable. You need a minimum structural height of 2.2 metres from the top of the ceiling joists to the underside of the ridge beam to create a habitable room.
The floor layout must also accommodate new, heavier floor joists (typically steel or engineered timber) without compromising the rooms below. There must be sufficient space on the landing below to install a permanent stairs, and trussed roofs require additional structural steel support beams.
The design of your conversion determines the amount of usable space and the final cost. A Velux attic conversion fits rooflights inline with the existing slope without altering the shape, costing 20,000 to 35,000 euro. Rear dormer conversions build out a flat-roof structure, creating flat walls, costing 35,000 to 60,000 euro.
Other designs include L-shaped dormers (extending over the main roof and rear return, costing 55,000 to 80,000 euro), hip-to-gable conversions (extending the sloping side roof vertically into a flat gable wall, costing 60,000 to 90,000 euro), and mansard conversions (80,000 to 120,000+ euro).
The cost of converting your attic in Ireland depends on the size of the house and the design chosen. A basic Velux conversion on a 2-bed terrace typically costs 20,000 to 30,000 euro and takes 2-3 weeks. A standard Velux conversion on a 3-bed semi-detached ranges from 25,000 to 38,000 euro, and rear dormer conversions on semi-detached homes average 45,000 to 65,000 euro.
For a hip-to-gable conversion on a larger 4-bed semi-detached, prices generally range from 65,000 to 95,000 euro, taking 5 to 7 weeks of structural and finishing works.
Homeowners in the Dublin region should expect a cost premium of 10% to 20% above national averages. This premium is driven by higher local labor rates, waste disposal charges, parking permits, and the structural complexity of working on older terraced homes in historic suburbs.
A standard semi-detached dormer conversion in Dublin typically ranges from 50,000 to 75,000 euro, reflecting these local logistical and labor factors.
In Ireland, many attic conversions are classified as exempt development, meaning they do not require formal planning permission. You cannot install dormer windows on the front roof slope facing the public road without planning. Rear or side dormer windows may also require planning if they overlook neighboring properties.
If the converted space is sold or advertised as a habitable room (e.g. a bedroom), it must comply fully with all building regulations. If it does not, it must be classified as storage space.
To ensure safety and legality, all conversions must comply with the Building Control Regulations. For fire safety, you must install fire-rated doors (FD30), mains-wired smoke detectors, and ensure the new stairs provide a safe escape route.
Ceiling joists must be replaced or reinforced with steel RSJs to support the floor weight. The staircase must have a maximum pitch of 42 degrees, a minimum headroom of 2.0 metres, and permanent handrails. The roof must also be insulated to meet modern U-value standards.
An attic conversion is generally 30% to 50% cheaper than building a ground-floor extension of the same size. This is because the roof, walls, and foundation are already in place, reducing structural building costs.
Most attics can be converted, but if the ridge height is below 2.2m, it will require planning permission for a dormer roof extension to make it habitable.
You do not need planning permission if you are installing Velux windows on the rear or side slopes. However, installing a dormer window on the front roof slope or altering the main ridge height requires planning permission.
A certified, building-regulation-compliant attic conversion can add between 10% and 15% to the market value of your home, making it an excellent long-term investment.
Yes. If the attic is intended for use as a bedroom, it must comply with Building Regulations (Part B for Fire, Part K for Stairs, Part L for Insulation). A structural engineer must certify the steel supports.
A basic Velux conversion typically takes 2 to 3 weeks, while a larger rear dormer or hip-to-gable conversion takes between 4 and 7 weeks depending on structural complexity.