Yes, a trussed roof attic can be converted, but it is a bigger job than converting a traditional cut roof, and it needs proper structural design. Trussed roofs are common in newer estates, where the roof is built from prefabricated W-shaped timber trusses rather than assembled on site.
The challenge is that those trusses fill the attic with structural webbing you cannot walk through, and each one carries part of the roof load. You cannot simply cut them away to make room. Instead, a structural engineer designs new support, typically steel beams and a new floor structure, to take over the job the trusses were doing before any of the webbing is removed. That extra design and steelwork is why a trussed roof conversion costs more than a cut roof conversion.
Once the new structure is in place, the finished result is the same quality of room as any other conversion. The trusses simply move the work into the structural stage rather than making the attic off-limits.
- A structural engineer must design the steels and floor before trusses are altered.
- The added steelwork and design increase the overall cost.
- Head height still decides whether a Velux approach works or a dormer is needed.
If you are not sure which roof you have, our guide on telling a cut roof from a truss roof helps. To get an accurate picture for your house, arrange a free assessment or start with the suitability checker.