The 10 extension builders from Google's results for South London, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleChislehurst
Rapid Bee supplies information and guidance on planning house extensions for residential properties in South London. Focus areas include structural expansion options designed to help expanding families secure additional living space without moving home.
020 3905 0162 1 Bromley Ln, Chislehurst BR7 6LH
on GoogleNew Addington, Croydon
Building Plus constructs single-storey, rear, and side-return house extensions for properties across South London. In addition to extension work, the team completes home refurbishments and loft conversions designed to blend into existing structures.
07722 252210 24 Walsh Cres, New Addington, Croydon CR0 0BX
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 GoogleCuffley, Potters Bar
Abbey Extensions designs and builds home extensions, garden rooms, and loft conversions across Cuffley, Potters Bar, and East London. The firm manages full property renovations to expand and update residential spaces.
Cuffley Place, Sopers Rd, Cuffley, Potters Bar EN6 4SG
on GoogleLondon
Extending residential properties across London, Pro Ficiency Ltd provides design and construction services for side return, rear, and wraparound home extensions. The team coordinates architects, builders, and interior design consultations to reconfigure living areas.
020 7435 6231 31 Fortune Green Rd, London NW6 1DU
on GoogleSouth London
Home Shape Ltd carries out domestic extensions and loft conversions across London and Surrey. Structural services encompass rear, side, wraparound, and two-storey builds, as well as Velux, dormer, and mansard roof additions.
on GoogleSouth London
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.
on GoogleLondon
Build Team provides integrated design and construction services for residential extensions throughout London. The team works on kitchen additions, rear and side return builds, wraparound structures, and loft conversions.
020 7495 6561 342 Clapham Rd, London SW9 9AJ
South London
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.
South London
Construction and hard landscaping services are provided by Davidrutland across South London, Bromley, and Croydon. The company handles house extensions as well as outdoor spatial improvements and garden layout changes.
In South London, single storey, per m² typically costs £2,100 – £2,900. Labour in Greater London runs 16% 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 south london". They are ranked on Google rating, online presence and other factors.
The figures above are South London 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.