Head height
Measure from the top of the ceiling joist to the underside of the ridge. Around 2.2 metres or more usually allows a straightforward conversion. Between 2.0 and 2.2 metres a dormer or altered roof structure is normally needed. Below 2.0 metres, more extensive structural work such as a mansard or lowering the ceiling below may be required.
Roof structure
Traditional cut roofs with purlins and rafters are the easiest to convert because the space is largely open. Trussed rafter roofs, common in homes built from the 1960s onwards, are filled with W-shaped webs and need steel beams installed before the trusses can be removed.
Staircase and access
Building regulations require a fixed staircase with adequate headroom. There must be a workable position on the floor below, often over the existing stairwell or by borrowing space from a bedroom.
Services and obstructions
Water tanks, boiler flues, soil stacks and chimney breasts all need consideration. Relocating a tank or converting to a pressurised system is common and should be allowed for in your budget.
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