Early feasibility check · Republic of Ireland
Is your attic suitable for conversion?
Reviewed 28 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 project also needs a safe structural design, workable stairs, an appropriate fire-safety route, ventilation, insulation and enough finished space for the intended room.
Six things to check before you ask anyone for a price
Useful finished headroom
A ridge measurement is only an early clue. New floor and insulated ceiling build-ups reduce the final clear height.
A workable permanent stair
The stair takes space below and must arrive where the new layout has suitable clearance.
A structure that can be adapted
Existing ceiling joists and roof members may not be designed for a converted room. Do not cut trusses or timbers without structural design.
A suitable fire-safety route
A converted attic can change the fire-safety needs of the whole home, including detection, escape and protected construction.
Ventilation and insulation
The design must manage heat, fresh air, moisture and roof ventilation together.
A realistic room brief
A bedroom, office, ensuite and storage space create different layout, service and compliance demands.
Seek professional input early when
- The roof uses closely spaced prefabricated trusses.
- There is no obvious stair position without losing an important room below.
- The home is protected, in an architectural conservation area or affected by restrictive planning conditions.
- You want a dormer, roof-shape change, bedroom or ensuite.
- The roof has leaks, condensation, altered timbers or previous unverified work.
None of these signs makes a conversion impossible. They mean that starting with a price, rather than with a design question, is likely to give you an incomplete answer.
Safety boundary
Do not walk between joists, move insulation or cut roof members to investigate. See the Government's Loft Conversion Guidelines and obtain property-specific professional advice.