Type A
Barrier protection
Cementitious slurries and spray applied membranes, forming a continuous barrier against the structure. Suitable where the structure is sound and the head of water is modest and well understood.
Hand & spray applied
Areas we cover · W1U, W1G
Basement waterproofing in Marylebone.
The Tyburn runs in a culvert beneath Marylebone Lane, and the curve of that street is simply the river's old course preserved in the street pattern — a rare case where you can read the hydrology off a map. Properties along that line see conditions the grid of Georgian terraces either side of it does not.
Ground conditions
What sits beneath Marylebone.
| Postcodes | W1U, W1G |
|---|---|
| Geology | London Clay |
| Groundwater | Concentrated along the Tyburn's buried course rather than spread across the area |
| Housing stock | Georgian terraces on the Portland estate, mansion blocks, converted townhouses |
Marylebone basements are often original vaults and service rooms under generous Georgian footprints, which convert well. The constraint is usually head height and access rather than water, provided the property is off the Tyburn alignment.
Marylebone is one of the areas we cover across Central London.
Specification
Choosing the right system for Marylebone.
BS 8102 sets out three forms of protection. Which one suits a property in Marylebone depends on the water head, the condition of the structure and what you intend to use the space for.
Type B
Structurally integral
Water-resistant concrete construction, with joints and service penetrations designed as part of the structure. Usually the route for new basements and underpinned extensions.
New build & underpinned structures
Type C
Drained protection
Cavity drain membrane, perimeter channel and a pumped discharge. It manages water instead of resisting it, and it remains maintainable — which is why it suits most conversions of existing cellars.
Maintainable · Grade 3 habitable
Nearby
We also work in these areas.
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Book a survey in Marylebone.
Tell us what you're seeing and we'll tell you honestly whether it needs a full waterproofing system or something much simpler.