House Extensions in South London
Suddeco designs, gets approval for and builds extensions, loft conversions and renovations across South London — Lambeth, Southwark, Lewisham and Wandsworth through to Croydon, Bromley and Sutton. Designed, approved and built by one team.
Side return · indicative renderWhat gets approved in South London
Real planning decisions near you, from council records.
We check South London decisions from your exact address
South London spans eleven boroughs, and each one decides applications against its own local plan. We do not hold a single district-level summary for the whole of South London, so we run the check against your own address instead — it uses the same council records.
Planned around the house you have
Terraces and side returns
Much of inner South London is Victorian and Edwardian terracing. A side-return or wraparound extension often adds the most space for the smallest footprint, because the narrow side passage is already there.
Party wall and shared structure
On terraced and semi-detached houses the work usually touches a shared wall, so party wall notices and an award are planned early rather than discovered on site.
Conservation areas differ by street
Several South London neighbourhoods sit in conservation areas, and borough policies on basements, roof terraces and outbuildings vary. We check the address before anything is drawn.
Start from a layout
What we build here
South London boroughs
South London neighbourhoods
What to know before building in South London
South London runs from the dense Victorian streets of Lambeth, Southwark and Lewisham out to the Edwardian and 1930s suburbs around Bromley, Croydon and Sutton. What works on one street rarely suits the next: a back-of-terrace side return in Balham is a different job from a two-storey side extension on a 1930s semi in Beckenham.
Conservation areas across the south — Blackheath, Dulwich and Camberwell among them — and borough-by-borough policy on basements, roof terraces and garden outbuildings all change what is possible. We check your exact address against council records before we draw anything, and price the whole job — design, approvals and build — in one estimate.
Where we work in South London
Balham, Battersea, Brixton, Camberwell, Clapham, Dulwich, Peckham, Streatham, Tooting, Wimbledon, Barnes, Blackheath, Forest Hill, Beckenham and Surbiton.
Postcodes: SW2, SW4, SW8, SW9, SW11, SW12, SW16, SW17, SW19, SE1, SE3, SE5, SE13, SE15, SE21, SE22, SE23, SE24, SE27, CR0, BR3, SM1
A construction company near you in South London
Looking for a construction company in South London? Suddeco designs, gets approval for and builds extensions, lofts, renovations and new builds across South London — building company, general contractor and design and build firm in one team.
Construction services in South London
South London FAQs
Do you build house extensions in South London?
Yes. Suddeco designs, gets approval for and builds extensions, loft conversions and renovations across South London and every other London borough. We survey the site, draw and approve the design, and build it with our own team. Call 020 3633 8086 or book a free survey.
Which South London areas do you cover?
Lambeth, Southwark, Lewisham, Wandsworth, Merton, Croydon, Bromley, Sutton, Bexley, Greenwich and Kingston upon Thames, plus the neighbourhoods inside them such as Balham, Dulwich, Peckham, Streatham, Tooting, Wimbledon, Blackheath and Beckenham.
Which extension suits a South London terrace?
On the Victorian and Edwardian terraces common across Lambeth, Southwark and Lewisham, a side-return or wraparound extension usually adds the most usable space for the smallest footprint, because the narrow side passage is already there. A rear extension on its own can leave that passage unused. What suits your house depends on the plot, the structure and the light — we review the existing layout before recommending a form.
Do I need planning permission for an extension in South London?
Some extensions fall within permitted development and some do not. Conservation areas, Article 4 directions, flats and listed buildings all change the answer, and the policy position differs between South London boroughs. We check your exact address against council records and confirm the route before drawings are prepared.
Will I need a party wall agreement?
Usually, on a terraced or semi-detached house where the work touches a shared wall, or where excavation happens close to a neighbour's foundations. Party wall notices and the award are handled as part of the project. Building regulations approval is a separate requirement and may also apply.
Do you build it yourselves?
Yes. Suddeco designs, handles planning and delivers the build with its own project management.