House Extensions Richmond & Kew 2026: Complete Guide to Costs, Planning and Design

Richmond and Kew are two of South West London's most desirable and prestigious areas, renowned for Richmond Park, Kew Gardens, the River Thames and some of the highest property values in outer London. The London Borough of Richmond upon Thames contains a wide range of large Victorian, Edwardian, inter-war and detached properties that offer excellent opportunities for house extensions. The combination of generous garden sizes, high property values and family-oriented buyers makes Richmond and Kew outstanding areas for house extension investment. LCCL Construction delivers house extensions across Richmond, Kew and all of South West London as part of our complete design and build service.

LCCL Construction — specialist house extension builders in Richmond and Kew

House Extensions Richmond and Kew: Best Types for Local Properties

Richmond and Kew properties include a wide range of styles. Victorian and Edwardian terraced and semi-detached houses suit rear extensions, side return extensions and wraparound extensions. The larger inter-war and post-war detached houses in Richmond Hill, Ham and Petersham suit generous double storey rear extensions and side extensions. Properties with larger garden plots in Kew and Richmond can accommodate extensions that would not be possible in denser London areas. The generous plot sizes in Richmond and Kew often allow for larger extensions than the standard London permitted development limits.

How Much Do House Extensions Cost in Richmond and Kew in 2026?

Rear extension: £38,000 to £72,000.

Side return: £38,000 to £72,000.

Wraparound: £65,000 to £110,000.

Double storey: £88,000 to £150,000.

All include full design and build. See our full house extension cost guide.

Planning Permission for House Extensions in Richmond and Kew

Most single storey rear extensions in Richmond and Kew fall within permitted development. However the London Borough of Richmond upon Thames has several conservation areas and Richmond Park is designated as a Site of Special Scientific Interest — properties adjoining or near the park may have additional restrictions. Kew has the Kew Green Conservation Area and parts of Richmond Hill are within the Richmond Hill and Thames Landscape Strategy area which applies strict design guidelines. 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 Richmond and Kew?

Richmond and Kew property values are among the highest in outer London. A wraparound extension costing £80,000 to £100,000 typically adds £140,000 to £250,000 to the value of a Richmond or Kew terraced house — a return of 150 to 280 per cent. See our guide on how much value a house extension adds in London.

Areas of Richmond and Kew We Cover

LCCL Construction covers all areas of Richmond and Kew including Richmond TW9 TW10, Kew TW9, Richmond Hill TW10, Ham TW10, Petersham TW10, East Sheen SW14, Mortlake SW14, Barnes SW13, Putney SW15, Twickenham TW1 TW2, Teddington TW11, Kingston upon Thames KT1 KT2 and all surrounding postcodes.

Frequently Asked Questions About House Extensions in Richmond and Kew

How much does a house extension cost in Richmond?

Costs range from £38,000 for a small rear extension to £150,000 for a large double storey extension. A typical wraparound extension costs £65,000 to £110,000.

To get a free consultation call LCCL Construction on 020 8037 7332 or get an instant quote online.