Approved member of the Federation of Damp
Below-ground waterproofing specialists · Wandsworth, SW18, SW11
Basement Waterproofing in Wandsworth
Wandsworth and Battersea have some of the busiest basement streets in London, from Victorian terraces between the commons to riverside homes near the Thames and the Wandle. Advanced Damp designs and installs basement waterproofing across SW18 and SW11, from cellar conversions to full basement extensions.
Newton Approved
Below-ground waterproofing across London and the South East.
CSSW and CSRT Trained Surveyors
Systems designed and specified to BS 8102:2022.
Long-Term Guarantee
Written guarantee on all new waterproofing installations.
CHAS Accredited
Fully insured, fixed-price quotations after survey.
Two Rivers and a High Water Table
Wandsworth and Battersea sit where two rivers meet the low ground of the Thames valley. North Battersea was once marsh and market garden on the Thames floodplain, built on soft alluvium and river gravels. The River Wandle runs through Wandsworth town to the Thames, and the Falcon Brook, now culverted, drained the higher ground around the commons down through Battersea. In these lower areas the water table sits close to the surface and rises with the river and the seasons.
Further south, the streets between Wandsworth Common and Clapham Common sit higher, on terrace gravel over London Clay. Here the problem is perched water: rain drains through the gravel and collects on top of the clay at cellar depth. The result is the same for a basement owner. Water presses on the walls and floor for much of the year.
The houses are mostly Victorian and Edwardian terraces built in the 1870s to 1900s. Many have a cellar under the front room, and the area between the commons is known for large family houses where owners have dug full basements under the house and garden. Riverside Battersea also has mansion blocks and converted industrial buildings with lower ground floors close to the river level.
New basements here are deep, and they sit in ground that is either wet gravel or clay holding perched water. That means waterproofing has to be designed in from the start, usually combining a structural concrete box with a cavity drain system and a pumped sump, so there is a second line of defence if one part fails.
Wandsworth Council has a specific planning policy on basements, covering flood risk, drainage and the effect on neighbouring properties, and parts of Battersea are in Thames flood zones. We design to BS 8102, take flood risk into account and work with your architect and engineer from the design stage.
Why Wandsworth Basements Need It
Wandsworth and Battersea basements face a high water table near the rivers and perched water on the higher ground. Common local risk factors include:
Left untreated, this sustained moisture pressure leads to efflorescence and salt staining, plaster breakdown, mould growth, timber decay in ground-floor joists and, over time, structural deterioration of the masonry itself.
Our Waterproofing Systems
With two rivers and a high water table, Wandsworth and Battersea basements need systems that collect and remove water reliably. We specify systems that manage that water rather than simply coating over it. A survey decides which system is right for your property.
Type A · Cementitious Tanking
A rigid bonded coating applied directly to sound masonry. Suited to Wandsworth cellars with stable brickwork and lower moisture risk storage spaces, plant rooms and vaults where full habitable conversion is not required.
Basement tanking →Type C · Cavity Drain Membrane
Our most specified system for SW18. A studded membrane channels groundwater safely to a sump rather than resisting it. the reliable choice where sustained hydrostatic pressure makes blocking water impractical.
Cavity drain membrane →For new basement excavations or projects requiring Camden planning submissions, see our work on structural waterproofing and cellar tanking.
How We Work
Groundwater & Assessment
A CSSW surveyor visits your Wandsworth property, identifies the water source, and reviews any previous failed treatments before recommending a system.
System Design & Fixed Price
We specify the right system for SW18's groundwater conditions to BS 8102:2022 and provide a clear, fixed-price proposal agreed before any work begins.
Installation & Guarantee
Our own teams install the system, no subcontracting. On completion, we issue a written long-term guarantee and advise on long-term sump maintenance.
Why Choose Advanced Damp in Wandsworth?
What Our Customers Say
"We had tanking done in our basement and we are very happy with the work completed by Dan. The job was done to a high standard and the office communication was great throughout the whole project."
Afreen Naz, Google Reviews"From first contact to end of contract everything was explained thoroughly and the work was carried out to a high standard. Each member of staff we had contact with was professional and easy to deal with. All areas were left neat and tidy. We would highly recommend their services."
Jacky Fernandes, TrustpilotPlanning work on a basement in Wandsworth?
The right system depends on how water reaches your walls and floor. A survey finds that first, so the design fits your property and the price is fixed before anything starts.
Book a Basement SurveyCall 0300 373 7251- 1. Book online or callPick a time that suits you.
- 2. Surveyor visitsMoisture readings, water source and the condition of the walls and floor.
- 3. Written specificationThe right system for your basement, with a fixed price and no obligation.
A Real London Type C Project
Basement Waterproofing Project in Fulham
See how our team successfully designed and installed a complete basement waterproofing system for a residential property in Fulham. This project highlights our risk-led approach, high-quality workmanship, and long-term waterproofing solutions for London homes.
Basement Waterproofing Across London
We design and install basement waterproofing across London and Surrey. Choose your area for local ground conditions, common problems and FAQs.
Accredited & Trusted
Wandsworth Basement Waterproofing FAQs
Is my Battersea basement at risk of flooding from the Thames?
Parts of Battersea near the river are in Thames flood zones, though they are protected by the Thames Barrier and river walls. The bigger day to day risk is groundwater, which rises and falls with the river and the seasons. We check the flood map and groundwater conditions for your street during the survey.
What waterproofing do you use for a new basement between the commons?
Most new basements we work on in Wandsworth use a combined system: a structural concrete box designed to resist water, plus a Type C cavity drain membrane with a pumped sump. BS 8102 recommends combined protection for habitable basements in wet ground, so if one part fails the other still protects the room.
How often does a basement sump pump need servicing?
We recommend a service once a year. The engineer checks the pumps, float switches, alarm and battery backup, and clears silt from the sump and drainage channels. Regular servicing is also a condition of most waterproofing guarantees.
Can you waterproof a cellar in a Wandsworth terrace without digging it out?
Yes. Many owners waterproof the existing cellar for storage or a utility room without lowering the floor. A cavity drain membrane can be fitted to the existing walls and floor. Lowering the floor for full headroom is a structural job and needs an engineer, building control and usually a party wall agreement.
Does Wandsworth Council allow basement extensions?
Yes, but they are controlled by a specific basement policy. Applications usually need information on structural stability, drainage, flood risk and the effect on neighbours. Your architect normally prepares the application, and we provide the waterproofing design for it.
Do you cover Putney, Earlsfield and Tooting?
Yes. We cover Wandsworth, Battersea, Clapham Junction, Earlsfield, Southfields, Tooting and the surrounding SW18, SW11, SW17 and SW12 streets. We also have a dedicated Putney basement page.
Related Services
Book a Wandsworth Basement Waterproofing Survey
If your Wandsworth or Battersea property has a cellar or basement showing damp, salts or water, or you are planning a new basement, the first step is a survey by a CSSW and CSRT trained specialist who understands the local water table.
We will assess your specific building, identify the source and type of water ingress, and specify the right system in writing with a fixed price.
Recent Work Near Wandsworth
Our recent work close to Wandsworth includes lower ground flat, Wandsworth SW18. Each case study sets out what the survey found and how the problem was fixed.
