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 · W1J, W1K
Basement waterproofing in Mayfair.
Mayfair holds the highest property values in the country, and below-ground space is one of the few ways left to add floor area to a house that cannot be extended outwards or upwards. The clay here is well understood and largely cooperative. The difficulty is that almost every building is protected, so the waterproofing has to achieve a habitable Grade 3 environment without touching fabric you are not permitted to alter.
Ground conditions
What sits beneath Mayfair.
| Postcodes | W1J, W1K |
|---|---|
| Geology | London Clay |
| Groundwater | Generally low, but the buried Tyburn runs south through the area towards the Thames |
| Housing stock | Georgian townhouses on the Grosvenor and Berkeley estates, mansion blocks, almost entirely listed or in conservation areas |
The townhouses around Grosvenor Square and South Audley Street typically have original vaults running under the pavement. Those vaults are often the most valuable part of a conversion and the most demanding to waterproof, because the structure above them is the street.
Mayfair is one of the areas we cover across Central London.
Specification
Choosing the right system for Mayfair.
BS 8102 sets out three forms of protection. Which one suits a property in Mayfair 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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Tell us what you're seeing and we'll tell you honestly whether it needs a full waterproofing system or something much simpler.