House Extensions Wandsworth SW18 2026: Complete Guide to Costs, Planning and Design
Updated: Oct 2
Wandsworth is one of South London's most active and sought-after areas for house extensions. The London Borough of Wandsworth encompasses a wide range of premium residential areas including Wandsworth Town SW18, Tooting SW17, Balham SW12, Earlsfield SW18, Southfields SW18 and Battersea SW11 — all characterised by large Victorian and Edwardian terraced and semi-detached houses with strong property values and high buyer demand for additional space. LCCL Construction delivers house extensions across all of Wandsworth as part of our complete design and build service.
House Extensions Wandsworth: Best Types for Local Properties
The Victorian terraced houses that characterise Wandsworth Town, Earlsfield and Tooting are ideally suited to rear extensions, side return extensions and wraparound extensions. A wraparound extension combining rear and side return creates a large open plan ground floor — the most popular choice for Wandsworth Victorian terraces. The larger Edwardian semi-detached houses in Southfields and Wandsworth Common suit double storey rear extensions.
How Much Do House Extensions Cost in Wandsworth in 2026?
Rear extension: £42,000 – £90,000 inc. VAT (£35,000 – £75,000 + VAT).
Side return: £42,000 – £93,600 inc. VAT (£35,000 – £78,000 + VAT).
Wraparound: £72,000 – £153,600 inc. VAT (£60,000 – £128,000 + VAT).
Double storey: £90,000 – £198,000 inc. VAT (£75,000 – £165,000 + VAT).
All include full design and build. See our full house extension cost guide.
Planning Permission for House Extensions in Wandsworth
Most single storey rear extensions in Wandsworth fall within permitted development. However Wandsworth has several conservation areas where planning permission is always required, and side return and wraparound extensions typically require planning permission. LCCL Construction checks all planning requirements. See our guide to house extension planning permission in London.
How Much Value Does a House Extension Add in Wandsworth?
A wraparound extension costing £72,000 – £153,600 inc. VAT (£60,000 – £128,000 + VAT) typically adds £120,000 to £200,000 to the value of a Wandsworth Victorian terraced house. See our guide on how much value a house extension adds in London.
Areas of Wandsworth We Cover
LCCL Construction covers all areas of Wandsworth including Wandsworth Town SW18, Tooting SW17, Balham SW12, Earlsfield SW18, Southfields SW18, Wandsworth Common SW18, Battersea SW11, Clapham SW4, Streatham SW16, Putney SW15, Wimbledon SW19 and all surrounding postcodes.
Frequently Asked Questions About House Extensions in Wandsworth
How much does a house extension cost in Wandsworth?
Costs range from £45,600 inc. VAT (£38,000 + VAT) for a small rear extension to £145,000 for a large double storey. A typical wraparound costs £72,000 – £153,600 inc. VAT (£60,000 – £128,000 + VAT).
To get a free consultation call LCCL Construction on 020 8037 7332 or get an instant quote online.
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