Dormer, Hip-to-Gable and Mansard Loft Conversions Compared

Not every loft conversion looks the same, and not every roof can take every type. The right design depends on your house, your roof shape and what you need the space for.

Rooflight conversion

This is the simplest type. Rooflight windows are fitted into the existing roof slope and the space is fitted out inside. It involves the least structural change but relies on having enough existing headroom.

Dormer conversion

A dormer extends the roof outwards, creating more headroom and floor area. Rear dormers are the most common on London houses and often give room for a bedroom and bathroom. Planning rules for what can be built, especially on the front, depend on your property.

Hip-to-gable conversion

Where a house has a sloping, hipped side roof, the hip can be replaced with a vertical gable wall, which adds usable space. It suits semi-detached and end-of-terrace homes and is often combined with a rear dormer.

Mansard conversion

A mansard changes the roof profile to a steep, almost vertical slope, creating a near full-height extra storey. It is common on terraced houses in some parts of London and usually requires planning permission.

How to choose

• Roof structure and existing head height

• Which rooms you need and how much floor area

• Whether your property is in a conservation area

• How the new roof will look from the street and from neighbouring homes

• The position of the new staircase on the floor below

A survey and early design work will show which options are realistic. You can read more about our loft conversion service or see the completed Southgate loft conversion in our projects.

Thinking about a project in London? Get in touch with Tota Design & Build to talk it through.