Waterproofing
Basement waterproofing
Survey-led basement waterproofing options, including tanking and maintainable cavity-drain systems.
Why diagnosis matters
Treat the cause, then repair the damage
Below-ground waterproofing must account for water pressure, structure, drainage, use and maintenance. We assess the space before discussing barriers, drained protection or specialist design.
Technical review
Dan, Director / Surveyor
Last reviewed: July 2026. Advice is general until the property, access and visible evidence have been assessed.
Guarantee & aftercare
Written guarantee terms are matched to qualifying work, with inclusions, exclusions and aftercare explained before acceptance.
What we consider
Possible causes and lookalikes
Groundwater pressure
Defective external drainage
Cracks and service entries
Unsuitable previous coatings
Inspection method
A clear work sequence
Step 1
Survey structure and water behaviour
Step 2
Define performance objective
Step 3
Select or refer design approach
Step 4
Install, test and document maintenance
Scope boundaries
Honest about what the work does—and does not—cover
Structural waterproofing design, pumps and complex conversions are supplied only where competence, insurance and design responsibility are confirmed. Otherwise we refer appropriately.
Common questions
About basement waterproofing
Is tanking or a membrane better?+
Neither is universally better. Substrate, water pressure, maintainability, use and drainage determine the appropriate approach.
Do pumps need maintenance?+
Yes. Pumped systems require planned servicing, alarm consideration and clear responsibility.
Can I tank a cellar myself?+
Below-ground water pressure and junction detailing create significant failure risk. A proper survey and specification are strongly recommended.
Related services
Continue your investigation
Next step
Claim your complimentary survey before choosing a treatment
Tell us what you can see, when it changes and where the property is. Photographs can help us triage the next step.