Wrap-Around Extensions London — Side and Rear Combined

What is a Wrap-Around Extension?

A wrap-around extension — also called an L-shaped extension — combines a rear extension and a side return infill into a single continuous structure. It wraps around one corner of the house, typically adding a large open-plan kitchen-dining-living space across the ground floor.

They are most common on Victorian and Edwardian terraces and semi-detached houses in London, which typically have a narrow side return passage that is ideal for infilling.

How Much Space Does It Add?

A typical wrap-around on a Victorian terrace adds 25–40m² of new ground floor space, compared with 15–20m² for a rear-only extension. This allows a genuinely large open-plan space — including a kitchen-diner large enough for an island, dining table for 8, and a sofa and TV area — all within a single new room.

Planning Permission

Most wrap-around extensions require full planning permission because the side extension element typically exceeds Permitted Development limits (a side extension faces a highway unless it faces away from the road). However, the planning consent rate for well-designed wrap-arounds in London is high — especially where neighbouring properties have similar extensions already.

In Conservation Areas, design quality matters significantly. SuperBuilder works with heritage-approved architects to design extensions that conserve character while creating contemporary, functional space.

What Does a Wrap-Around Extension Cost?

£70,000–£120,000 for a quality wrap-around in London. The range reflects the size of the extension, glazing specification, the kitchen fit-out included, and whether structural steelwork above is complex.

Key cost items: - Foundations and groundworks: £8,000–£15,000 - Structural steelwork (RSJs for the open-plan span): £5,000–£12,000 - Glazing (bifolds, skylights, structural glass roof): £10,000–£30,000 - Roof (GRP flat, zinc standing seam, or tiled): £8,000–£20,000 - Kitchen fit-out: £15,000–£35,000

Design Considerations

The structural beam spanning the open-plan space is a key design decision — exposed steel beams can become a feature. Roof lights and structural glass roofs flood the internal space with natural light. The connection point between old and new can be made invisible with careful material selection.

Call SuperBuilder on 0800 530 0853 for a free design consultation and estimate.