What does an attic conversion cost in Ireland?

Short answer: public Irish price guides reviewed in August 2026 commonly place straightforward rooflight projects in the tens of thousands of euro, while dormer, hip-to-gable and ensuite projects can move well beyond €50,000. Published figures vary too much for one national “average” to be reliable without a survey and written scope.

Published price signals—not a promised price

Our scan of visible Irish competitor pricing found advertised starting points around €18,500, broader rooflight guides spanning roughly €20,000–€45,000, and complex dormer or hip-to-gable guides extending from roughly €35,000 to €80,000+. That spread reflects different scopes, locations, specifications and VAT treatment. Treat it as an early budgeting envelope only.

The six details that move a quote

1. Roof change: keeping the existing roof form is usually a different scope from adding a dormer or changing a hipped roof.
2. Structure: the existing roof, floor, steel requirements and load paths must be professionally assessed.
3. Stairs and escape: safe, compliant access and the fire-safety strategy affect both layout and cost.
4. Room use: a compliant habitable room can require more than a storage or occasional-use space.
5. Services: an ensuite, heating changes, electrics and ventilation add design and trade dependencies.
6. Finish and access: joinery, flooring, decorating, scaffolding, parking and waste access all change the scope.

How to compare attic conversion quotes

Ask every provider to price the same written brief. Check whether VAT, professional design, structural engineering, planning support, scaffolding, windows, stairs, insulation, ventilation, electrics, plumbing, finishes, certification and waste removal are included. A low headline is not comparable if key work is excluded.

Keep a contingency

Existing buildings can reveal conditions that were not visible at the first visit. Agree how variations are approved and priced, and keep a separate contingency rather than committing the full available budget to the initial contract sum.