Early feasibility check · Republic of Ireland
Is your attic suitable for conversion?
Reviewed 18 August 2026 · A homeowner screening guide, not a structural or compliance assessment.
Short answer: roof height is only one part of the answer. A viable attic conversion also needs a safe structural design, a workable stair, an appropriate fire-safety route, ventilation, insulation and enough finished space for the intended use.
Six things to check before requesting quotes
Useful headroom
Measure from the existing ceiling joists to the highest point only as an early reference. The finished floor and insulated ceiling build-ups will reduce the final clear height.
A workable stair position
A safe permanent stair takes space on the floor below and must arrive where usable headroom and a compliant layout are possible.
A structure that can be adapted
Existing ceiling joists and roof members may not be designed as a habitable floor. Do not cut trusses or roof timbers without professional structural design.
A fire-safety route
Turning a roof space into living accommodation effectively adds a storey. Detection, protected escape, doors, windows and construction may all form part of the strategy.
Ventilation and insulation
The design needs to manage warmth, fresh air, moisture and condensation without blocking required roof ventilation.
A realistic room brief
An office, bedroom, ensuite and storage room create different layout, services and compliance demands. Decide the intended use before seeking prices.
Signs that professional input is needed early
- The roof uses closely spaced prefabricated trusses.
- There is no obvious stair position without losing an important room below.
- The house is protected, within an architectural conservation area or subject to restrictive planning conditions.
- You want a dormer, roof-shape change, bedroom or ensuite.
- The roof has leaks, spray foam, condensation, altered timbers or previous unverified work.
These signs do not automatically make a conversion impossible. They mean that a price-first approach is likely to be misleading.
Safety boundary
Do not walk between joists, move insulation, cut roof members or rely on a tape measurement as approval. The Government recommends professional design advice for attic works. See the official Loft Conversion Guidelines.