Hip-to-Gable Loft Conversion

A hip-to-gable loft conversion is one of the best options for semi-detached and detached houses in Worthing and across West Sussex. It works by extending the sloping hip end of your roof outward and upward to create a new vertical gable wall. That might sound straightforward, but the result is transformative — suddenly the awkward triangular corner of your loft becomes a full-height, square room.

Many houses in areas like Goring-by-Sea, Salvington and Tarring were built with hipped roofs — four-sided roofs that slope down on all sides, including the end walls. This design gives the property a certain look, but it also means the loft space tapers sharply toward the party wall, making conversion tricky. A hip-to-gable conversion solves this by removing the hip slope entirely and replacing it with a vertical gable wall that aligns with, or extends beyond, the existing ridge. The new gable can be bricked up to match the existing property or finished in render or tile hanging.

The structural work involved is more complex than a straightforward dormer. The hip rafters are removed, the ridge is extended, and a new gable wall is built from the eaves level up. This requires careful sequencing — temporary propping of the existing roof structure while the new frame is built — and precise coordination between our carpentry and brickwork teams. All steelwork and structural calculations are provided by a qualified engineer.

In many cases, a hip-to-gable conversion is combined with a rear dormer to create what's sometimes called a full loft conversion — hip-to-gable on one side and a dormer at the back. This gives you a genuinely large L-shaped or rectangular room across the full width and depth of the loft, with enough space for a bedroom, an en-suite, and even a study or dressing area.

Planning permission is typically required for a hip-to-gable conversion, as it changes the external appearance of the roof in a way that goes beyond permitted development for most properties. We handle planning applications as part of our service, so there's no need to appoint a separate planning consultant or architect. We'll tell you upfront what's likely to be needed and how to present it to the local planning authority.

A hip-to-gable conversion typically takes eight to ten weeks for the structural and fit-out work, once planning approval is in place. The finished room is building-regulation-approved and properly insulated, finished and certified — not a temporary storage space dressed up with a stud wall, but a genuine habitable room that adds lasting value to your home. Materials are sourced through D.J. Redman in Worthing, keeping costs competitive without compromising on quality.