Coverage · 30 areas
Where we work.
We're based in South Croydon and work across London and the Surrey belt. Each area has its own notes on the ground conditions, the groundwater and the housing stock, because the right waterproofing specification genuinely does change from one postcode to the next.
8 areas
Central London
Buried rivers dominate. The Fleet, the Tyburn, the Westbourne and Counter's Creek all still run in culverts beneath these boroughs, and properties sitting on those alignments behave nothing like the street behind them.
4 areas
North London
The high ground is the wet ground here, which catches people out. Water moving down through the permeable sand on Hampstead meets the clay beneath and emerges as a spring line — both the Fleet and the Tyburn rise on this ridge and run south through Camden and Islington in culverts.
7 areas
West London
This is the part of London where groundwater genuinely moves. The terrace gravels are permeable and hydraulically connected to the Thames, so levels respond to the river and to tides rather than sitting still. A tanked barrier that would be adequate on clay can be the wrong call a few streets closer to the water.
9 areas
South London
South London is stitched with culverted rivers — the Effra, the Falcon Brook, the Wandle and the Beverley Brook. Their old courses are still the wettest lines in the area, and they rarely follow the modern street pattern, which is why one house takes water and its neighbour never has.
4 areas
Surrey & the North Downs
The Chalk aquifer is the whole story here. After a run of wet winters it recharges and the water table can rise many metres, bringing the bournes back to the surface — the Caterham Bourne is a documented groundwater flooding source. Cellars that have been dry for a decade flood in these years and then dry out again.
Not listed?
We very likely still cover it.
These are the areas we've written up, not the limit of where we travel. Send us the postcode and we'll tell you straight away.