Lambeth · Herne Hill · SE24 · SE21 · SW2
Builders in Lambeth, SE21 and SE24
Side return and rear extensions on the converted flats and Victorian houses of Herne Hill, Brixton, Tulse Hill, Streatham and Clapham — where who owns the freehold shapes a project as much as what the council allows.
What we designed on Rollscourt Avenue
The clearest example of Lambeth work in our portfolio is a ground floor flat in Herne Hill. The existing kitchen and living area was dark and cut off from the rest of the home. The scheme extends into the side return and out into the garden to make one bright space for cooking, dining and sitting, while keeping the two-bedroom layout entirely intact — because on a flat the bedrooms are the value, and losing one to gain a kitchen is a poor trade.
The detail worth knowing is the courtyard. We designed in a small courtyard specifically so the second bedroom kept a practical escape route. Wrapping new accommodation around an existing bedroom can leave that room without an acceptable means of escape, and that is the sort of thing which surfaces at building control after the drawings are approved and the money is committed. Solving it on paper costs a little floor area. Solving it later costs a redesign.
Extending a flat is a different discipline
Herne Hill, Brixton, Tulse Hill and much of Streatham are built from large Victorian and Edwardian houses that were subdivided into flats decades ago. If you own the ground floor of one and want to extend, three things apply that do not apply to a house.
- Flats have no permitted development rights for extensions. A planning application is required, without exception. Any builder who tells you otherwise is wrong, and the mistake is an expensive one because it tends to be discovered after work has started.
- Your lease will almost certainly require the freeholder's consent. That is a separate process from planning, running to its own timetable, and it is the one people leave until last and then wait on. Expect a licence to alter, and often the freeholder's own surveyor reviewing your drawings at your expense.
- Means of escape is scrutinised harder. Building around existing habitable rooms changes their escape provision, and that has to be designed in from the beginning rather than resolved at inspection.
There is a quieter fourth. The structure you are altering is shared. The wall you want to open up may be carrying the flat above, and the drainage you are moving may serve it too. On a house those are your decisions alone. Here they are decisions with someone else's home attached, settled by structural design and by a conversation with the freeholder before anyone prices the work.
Check which council you are in before anything else
Herne Hill straddles the boundary between Lambeth and Southwark. Addresses a few streets apart can fall under different councils, with different local policies, different design guidance and different validation requirements. Establish which one your address sits in before drawings are prepared for the wrong authority — the boundary runs through the middle of an area that looks entirely uniform from the pavement.
The rest of the borough is more straightforward on that point. Brixton, Tulse Hill, Streatham, Stockwell, Clapham and West Norwood are Lambeth. Dulwich is largely Southwark. But Lambeth carries a substantial number of conservation areas, and in a conservation area the permitted development rights you were counting on may be restricted or removed altogether. Where that applies, the council is assessing the effect on the character of the area rather than only the size of the box, so materials, window proportions and what is visible from the street become part of the case.
The housing stock, and what it wants
Three broad types dominate. First, the large Victorian and Edwardian villas and terraces around Herne Hill, Tulse Hill and Brixton Hill — generously proportioned, frequently with a lower ground or semi-basement level, and mostly converted. Second, the interwar semis and terraces of Streatham, Norbury and the southern edge of the borough, on deeper plots with better side access. Third, a considerable amount of ex-local-authority housing, both houses and blocks, where the freehold position and any interest retained by the council need checking before a scheme is drawn.
Where a house has survived undivided, the work is familiar: side return infill, rear extension, and an L-shaped dormer where an outrigger exists. Where it has been divided, the ground floor flat can usually extend and the upper flats generally cannot, which turns the neighbours upstairs from an inconvenience into a party to the project.
Semi-basements are the local temptation. They already exist under a good number of these houses, they are already partly dug, and it is easy to assume converting one is a small job. It rarely is. Damp, headroom, underpinning, light wells and the effect on the structure above are all in play, and it is a project to survey properly rather than assume into.
Getting light into a plot with buildings on both sides
Extending the back of a ground floor flat in a subdivided villa means building on a plot with neighbours close on both sides and a garden that may be shared or apportioned. Daylight here is a genuine constraint rather than a styling preference.
What works is light from above, and light from the part of the plan you did not expect to use. Large glazed doors across the rear do most of the photographable work and very little for the middle of the layout. Rooflights placed over the areas furthest from the garden do the opposite. A courtyard or light well, of the kind we designed in Herne Hill, does both jobs at once: it brings daylight into the centre of a deep plan and it answers the escape question that a deep plan creates.
Ask what happens to your existing rooms once the extension is on, not just what the new room will be like. Every extension takes something from the rooms it attaches to. The design either accounts for that or ignores it, and you can tell which from the answer you get at the survey.
Common questions about building work in Lambeth
Do you work across Lambeth?
Yes. Home Constructive builds throughout Lambeth, including Herne Hill, Brixton, Streatham, Clapham, Stockwell and the Dulwich borders. Most of our work in the borough sits in SE21 and SE24. If your address is just outside, ring us anyway and we will tell you plainly whether it is a job we should take.
What sort of houses do you work on in Lambeth?
Victorian terraces and villas for the most part, with larger semi-detached houses towards Herne Hill and Dulwich. Many of the terraces have the outrigger and side return that make a ground floor extension worthwhile; the villas more often call for a rear extension and internal reworking.
Do I need planning permission for an extension in Lambeth?
Sometimes not, but Lambeth has substantial conservation area coverage and it matters more here than in some boroughs. Permitted development still applies to plenty of houses, and is removed entirely on others. We check your specific street with the council before any drawings, because it changes what is worth designing.
How do I get a price for work in Lambeth?
It starts with a free site survey at the house. We look at the structure, the drainage and the services, tell you what the house will and will not allow, and price the work we have actually seen. Ring 07891 981021, Monday to Saturday, or send the address and what you are thinking of doing and we will arrange a time.
Book a free site survey in Lambeth
If you own a ground floor flat in Herne Hill, Brixton or Tulse Hill, the survey is where you find out what is realistically achievable, which council decides it, and what the freeholder position is likely to mean for your timeline.
It costs nothing and carries no obligation. We would far rather tell you the awkward things before you commission drawings than after.
From the portfolio
Rollscourt Avenue, SE24 · Flat extensionGround floor flat, side and rear extension