Greater London · SM1, SM2, SM3, SM5, SM6
Annexes in Sutton
An annexe is self-contained living accommodation on the same plot as a main house, complete with its own kitchen and bathroom facilities, built either as a new detached structure, a conversion of an existing outbuilding, or an extension with its own entrance.
In Sutton, that covers Cheam, Carshalton, Wallington, Belmont, North Cheam. Sutton is a residential outer-London borough with a traditional High Street and well-established suburbs across Cheam, Carshalton and Wallington, offering a mix of interwar family housing and period properties close to Carshalton's historic ponds and village core, within reach of our Croydon and Surrey teams.
Coverage
Areas we cover in Sutton for annexes
Property styles in Sutton
The borough has a strong stock of 1920s and 1930s semis and detached houses across Cheam, North Cheam and Belmont, alongside Victorian and Edwardian houses in the older parts of Carshalton and Wallington. Rear and side-return extensions and loft conversions are common on the semi-detached stock typical of the area.
Planning considerations
Sutton Council (London Borough of Sutton) is the local planning authority. Carshalton village and parts of Cheam and Wallington are conservation areas with a number of listed buildings around the historic ponds, which affects alterations to visible elevations and materials. We confirm the position for individual properties at feasibility stage.
How it works
Our annexes process
- 01
Feasibility and planning strategy
Assessing the plot, existing structures and local planning policy for ancillary accommodation, and whether a new build, conversion or extension route is best.
- 02
Design and approvals
Preparing drawings, submitting for planning permission (usually required for annexes with independent facilities) and Building Regulations.
- 03
Construction
Groundworks and structure (for a new build), or structural and fabric works to the existing building (for a conversion), followed by full services connections.
- 04
Fit-out and completion
Kitchen and bathroom fit-out, decoration, and Building Control sign-off.
Also in this area
Other services we provide in Sutton
Nearby coverage
Annexes in nearby areas
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FAQs
Annexes in Sutton: FAQs
Do you provide annexes across all of Sutton?
Yes, we cover the SM1, SM2, SM3, SM5 and SM6 postcode areas in full, including Cheam, Carshalton, Wallington, Belmont, North Cheam.
Do I need planning permission for an annexe?
Usually yes, because independent cooking, sleeping and washing facilities mean the structure is not treated as a simple outbuilding. Some annexes intended purely as ancillary accommodation for the main house can fall under permitted development, but this depends on size, position and local policy, which we check during feasibility.
Can an existing garage or outbuilding be converted into an annexe?
Yes, provided the structure is suitable and can be brought up to full Building Regulations standard for insulation, damp-proofing and services. We assess this as part of the feasibility stage alongside a new-build option.
Do you cover Carshalton and Wallington as well as Sutton town centre?
Yes, we work across the SM1, SM2, SM3, SM5 and SM6 postcode areas, including Sutton town centre, Cheam, Carshalton, Wallington and Belmont.
Get a quote for annexes in Sutton
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Last reviewed 2026-07-28.