Roof repairs, flat roof waterproofing and parapet work on Clapham housing stock, from the Georgian streets of the Old Town to the 1930s mansion blocks facing the Common. Free survey, 10-year workmanship guarantee.
Clapham has an unusually wide spread of building ages for one postcode, and the roof problems change completely from street to street. A Georgian house off Grafton Square, an Edwardian terrace in Abbeville Village and a 1930s mansion block on the edge of the Common have almost nothing in common structurally, and quoting them the same way is how roofers get it wrong here.
K & M Roofing Solutions works across SW4 and the Clapham side of SW11, covering Clapham Old Town, Abbeville Village, Clapham North, Clapham Park and the streets facing the Common. Two things shape almost every job in this area: a great deal of the stock sits inside a Lambeth conservation area with permitted development rights removed, and almost all of it sits on London clay.
That combination matters. The clay means the buildings move seasonally, which is why parapets crack and flashings open here rather than staying put. The conservation designations mean the fix has to be acceptable to Lambeth as well as watertight, and that is a conversation worth having before the scaffold goes up rather than after.
If you want to see what Clapham customers have said before you call, our reviews sit on the K & M Roofing Solutions listing on Google, alongside the Croydon address and opening hours. The rating there is 5.0 from 60 reviews.
Clapham divides into four rough building periods, and each one fails in its own way.
The oldest is the Georgian and early Victorian core around Clapham Old Town and Grafton Square, where houses sit behind parapets with the roof hidden from the street. On these the roof you can see from the pavement is not the roof that leaks. Water gets in at coping level or through a hidden gutter behind the parapet, then travels down inside a solid wall before it shows on a bedroom ceiling.
Around Abbeville Road the stock turns Victorian: terraces and larger villas with slate front slopes, rear outriggers and back additions that have been extended more than once. The Edwardian streets of Abbeville Village follow, with wider frontages, clay tile and bay roofs that are a common entry point once the lead has moved.
Then there are the 1930s mansion blocks facing Clapham Common, which behave like small commercial buildings rather than houses. Their roofs are shared, the responsibility is set by the lease rather than by who lives underneath, and the flat-roofed extensions added to many of them in the 1960s and 1970s are now well past the life of their original covering.
Clapham Park and Clapham North add a further layer of interwar and postwar housing, much of it with flat or shallow-pitch roofs and original rainwater goods that have never been replaced.
These are the recurring faults on Clapham buildings specifically, in roughly the order we meet them.
Most pre-1920s Clapham houses were built with solid brickwork and no cavity, so there is nothing inside the wall to stop water crossing from outside to inside. Once the parapet, the pointing or a chimney has let water into the masonry, it moves through the wall rather than being caught. This is why a damp patch on an upstairs Clapham wall so often has nothing to do with the covering on the roof.
The single-storey extensions and rear additions bolted onto Clapham mansion blocks in that period were covered in materials that were never expected to last this long. They are now the most common flat roof failure we see on the Common side of SW4. They are also usually a good candidate for an overlay rather than a strip, because the deck below is often sound and the block cannot easily be opened up while people live in it.
A surprising number of Clapham houses still have their original cast iron rainwater goods, now well past a century in service. Cast iron does not fail gracefully: it corrodes at the back where nobody looks, the joints open, and water runs down the wall behind the pipe for years before anyone notices. On a solid-walled house that is a damp problem rather than a gutter problem.
Clapham sits on London clay, which shrinks in dry summers and swells again in wet winters. That seasonal movement works on the tallest, least supported masonry first, which is the parapet. Coping joints open, cracks reappear a year after they were filled with something rigid, and the flashing where the roof meets the parapet gets pulled loose. A repair here has to accommodate movement or it will not last.
Almost every Clapham terrace has a flat roof somewhere at the back, on a rear addition, a side return or a dormer, and those roofs are where most of our SW4 and SW11 work happens. They are small, they are usually invisible from the street, and they carry the most awkward details on the house: an upstand against the neighbour, an outlet, and a junction with the main slope.
Replacing a handful of slipped slates on an Abbeville Road terrace is easy. Matching them so the repair is not visible from the street is the part that takes judgement, and in a conservation area it is also the part the council cares about. We source to match rather than fitting whatever is on the van, because a patch in the wrong colour is a permanent one.
A large share of Clapham roofs sit inside a conservation area, and Lambeth applies the designations tightly. Clapham Old Town Conservation Area is among the most closely controlled in the borough: dormers are generally acceptable only on the rear slope, and traditional materials are expected on anything visible. Abbeville Village and Clapham Park are designated as well.
Lambeth has also made Article 4 directions covering many streets in the area. An Article 4 direction removes permitted development rights, which is the mechanism most homeowners assume lets them alter a roof without asking. Where one applies, the default route is a full planning application even for work that would be permitted a few streets away.
The practical consequence for a roof is simple. Like-for-like repair is normally straightforward. Anything that changes what the roof looks like from a public vantage point, including a new dormer, a change of covering material or a rooflight on a front slope, needs checking with Lambeth before it is priced, not after.
We survey with that in mind and say plainly when a proposal is likely to need consent. What we will not do is quote you for something that looks cheap and then leave you to discover it was never going to be approved.
The same services as anywhere else in South London, but these are the four that account for most of our SW4 and SW11 work.
The rear additions, side returns, dormers and mansion block extensions that carry most of Clapham flat roofing, including the falls and outlets behind a parapet.
More about flat roof repair and waterproofingWe sealed a leaking GRP roof in Clapham with a cold-applied liquid system rather than stripping it, which is often the right answer on an occupied flat or a block where opening the roof is disruptive.
More about liquid applied waterproofingSlate and clay tile work on the Abbeville Road and Abbeville Village terraces, including matched replacement slates, ridge re-bedding and chimney flashings.
More about pitched roof repair and re-roofingRepair and replacement of the original cast iron gutters and downpipes still in service on a lot of Clapham houses, and the hidden gutters behind Old Town parapets.
More about guttering and rainwater goodsSend us your SW4 or SW11 address and what you have noticed. The survey is free, and if the honest answer is that you do not need the work, that is what the report will say.
