House Extensions in South West London

Whether you need a rear kitchen-diner extension, a side-return infill to reclaim a narrow passage, or a full wrap-around addition, our experienced team manages every stage from initial drawings and planning applications to Building Control sign-off and final finishes.

Types of House Extension We Build

Rear Extensions

Rear extensions are among the most common projects we undertake across South West London. On 1930s semi-detached properties in Morden and Sutton, a single-storey rear addition can transform a separated kitchen and dining area into a large, open-plan family space. Under Permitted Development (Class A), many single-storey rear extensions can proceed without full planning permission, subject to neighbour consultation and local authority conditions.

Side-Return Extensions

Victorian and Edwardian terraced houses in Wimbledon, Mitcham, and parts of Morden frequently have a narrow side passage that is largely unused. A side-return extension fills this gap and, combined with a rear extension, creates a substantial L-shaped kitchen-dining space. Party Wall notices are typically required before work begins on shared boundaries.

Wrap-Around Extensions

Combining a rear extension and a side-return extension in a single project produces a wrap-around extension, ideal for homeowners who want the maximum possible ground-floor footprint. These projects generally require a full planning application and a structural engineer's calculations for the steel frame.

Double-Storey Extensions

Two-storey additions add both ground-floor space and first-floor bedrooms or bathrooms. These projects fall outside Permitted Development and require a planning application. Our team liaises with architects and local planning authorities (London Borough of Merton for Morden/Wimbledon/Mitcham; London Borough of Sutton for SM1-SM3 areas) throughout the process.

Our Build Process

1. Initial Consultation and Site Survey - We visit your property, assess the structure, and discuss your design goals.
2. Drawings and Planning - We co-ordinate with architectural technicians and submit any required planning or prior approval applications.
3. Structural and Building Regulations - We arrange a Structural Engineer where RSJ steel beams are required, and notify Building Control before work commences.
4. Construction - Groundworks, brickwork, roofing, insulation, windows, and first-fix services are all managed by our site team.
5. Second Fix and Finishes - Plastering, floor screed, joinery, and decoration are completed to your specification.
6. Building Control Sign-Off - We obtain a completion certificate confirming the extension meets all Building Regulations.