The 10 extension builders from Google's results for Wandsworth, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleLondon
Draw and Plan produces architectural drawings for rear extensions, side extensions, dormers, and mansard loft conversions throughout Wandsworth. The firm prepares planning submissions and Building Regulations documentation designed to meet local council guidelines on property proportions and conservation areas.
020 8243 8779 8 Hollies Wy, London SW12 8QG
on GoogleLondon
AGA Associates provides architectural planning and project management for home extensions and residential refurbishments across Wandsworth. The practice works on Victorian and Edwardian terraced houses, detached villas, and modern infill developments, overseeing projects from initial consultation to completion.
020 8014 8130 13 Hanover Square, London W1S 1HN
on GoogleLondon
Alstruct Ltd provides house extensions, loft conversions and basement conversions for homeowners in Chiswick and West London. Its services also include groundworks, full property renovations and garden landscaping.
020 8080 8240 15B Raven Rd, London E18 1HB
on GooglePopes Dr, London
LCCL Construction is a design and build company converting lofts, extending houses and renovating homes across East London. It works in areas such as Hackney, Walthamstow, Leyton and Bow, where much of the housing is Victorian terraces, and provides architectural design as part of its service.
020 8037 7332 3rd Floor, Hathaway House, Popes Dr, London N3 1QF
on GoogleLondon
Hampstead Renovations plans and coordinates residential extension projects for homeowners located in Wandsworth Town. The firm provides planning guidance, builder briefing support, and project management for house expansions across the SW18 area.
020 7101 3168 Palace Court, 250, Unit 3 Finchley Rd, London NW3 6DN
on GoogleRichmond
Studio 20 Architects London produces architectural designs for loft conversions and house extensions in Richmond. The firm creates plans to reshape roof spaces and enlarge residential properties across the local area.
020 3432 2770 parkshot house, 5 Kew Rd, Richmond TW9 2PR
on GoogleLondon
S and M Solutions designs and builds house extensions for residential properties in Wandsworth and across South West London. The firm manages structural alterations and home expansions aimed at adding space and light to modern family homes.
020 3092 3791 34 Couthurst Rd, London SE3 8TW
on GoogleRanelagh Gardens, London
Red Box Maintenance Ltd carries out home improvement projects across Chiswick and South West London. Its services cover kitchen and bathroom refurbishments, property extensions, loft conversions, painting, and general maintenance work.
020 7381 1539 19, Hurlingham Studios, Ranelagh Gardens, London SW6 3PA
on GoogleWandsworth
Simply Extend builds house and kitchen extensions across East and South London, covering areas such as Croydon, Lambeth and Wandsworth. The business manages residential builds through assigned project managers, handling groundworks, brickwork construction, plastering and internal fittings.
Wandsworth
Plus Rooms provides house and kitchen extension services to homeowners in Richmond-upon-Thames and across South West London. The company manages projects from design through to construction, handling planning regulatory requirements along the way. Its team also builds loft conversions.
In Wandsworth, single storey, per m² typically costs £2,200 – £3,100. Labour in Greater London runs 22% above the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "house extensions wandsworth". They are ranked on Google rating, online presence and other factors.
The figures above are Wandsworth ranges. These explain what drives them, so you can read a quote properly.
Per-square-metre prices for single-storey, two-storey, side return and kitchen extensions, costs by size, the fees outside the build price, and planning limits by nation.
The permitted development limits for extensions, lofts, porches and outbuildings in England, where the rights do not apply, what prior approval and a certificate cost, and how Wales, Scotland and NI differ.
When the Party Wall Act applies, which notice to serve and how far ahead, what your neighbour can do, what a surveyor's award costs, and the rules in Scotland and NI.
Under permitted development, three metres for a terrace or semi and four for a detached, doubled to six and eight under the prior approval process. Height, materials and how much garden you cover all carry separate limits, and none of it applies in a conservation area.
If you are excavating within three metres of a neighbour's foundations or building on the boundary, yes. You must serve notice two months before work starts. Skipping it is the most common reason extension projects stall.