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Trussed Roof Loft Conversions —
The Solution for Modern London Homes

Post-1960s Properties

Trussed Roof Loft Conversions — The Solution for Modern Homes

If your home was built after approximately 1960, there is a strong likelihood it has a trussed roof — a roof built from factory-manufactured W-shaped timber trusses rather than the traditional “cut” rafters used in older properties. Trussed roofs present specific challenges for loft conversion, but they are absolutely convertible with the right structural engineering approach.

What Is a Trussed Roof?

Cut Roof vs Trussed Roof

A cut roof is built on site using traditional timber rafters — the type found in virtually all Victorian and Edwardian properties. The diagonal members create a usable void between the rafters.

A trussed roof uses prefabricated W-shaped frames. The diagonal web members that form the “W” criss-cross the interior of the roof void, making it impossible to use as a habitable space without structural modification. The modification involves:

Designing and installing new structural elements — typically steel beams — to replace the structural function of the trusses that are being removed
Removing the truss web members within the conversion zone
Building Regulations approval for the structural modification
Structural engineer’s sign-off at key stages of the build

If you’re unsure whether your property has a cut or trussed roof, our free survey will confirm this and advise on the most appropriate and cost-effective conversion approach.

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