Basement Waterproofing Services
Basement water problems rarely resolve themselves. Left untreated, they can lead to structural deterioration, mould growth and costly repairs.
Timberwise provides professionally designed waterproofing systems tailored to your property type, ground conditions and intended use, giving you complete peace of mind. Trusted by homeowners, developers and commercial clients since 1968.
Request a Free Basement Waterproofing Survey With Our Expert Team
Request a Free Basement Waterproofing Survey With Our Expert Team
Why Choose Timberwise
Local Basement Waterproofing Teams
Our PCA-qualified surveyors and technicians have local offices throughout the UK, meaning that we can help no matter where you are located.
Certified Property Care Specialists
We are members of the Property Care Association, and endorsed by Which? Trusted Traders, as well as being members of Checkatrade, and Trustmark.
Long-Term Guarantees
To give long-term peace of mind, all Timberwise damp proofing and timber treatments carry a 20-year guarantee, and completed basement waterproofing installations are backed by a 10-year guarantee.
Proven Results in UK Properties
Whether you live in an older terraced home, a modern loft or basement conversion, or a listed building, our local team of surveyors and technicians can help.
What Our Customers Say
“The project was damp proofing a basement games room… The project was clearly defined and finished within the agreed time, which was very important to us.
Of the team, Tim, Matt and Mattie were the ones we had most contact with, and they were all outstanding and a credit to Timberwise.“
Phil – Timberwise Customer
“I’ve just witnessed something amazing. Gary just came to assess my cellar, for which I had been previously quoted many thousands of pounds of work to prevent damp. He told me it was all dry, after checking with a very good professional damp meter, and all I needed was a humidifier or extractor fan to lower the humidity…
The experience of meeting such an honest person was quite moving. I would throughly recommend his service, and I see from other reviews that the rest of the company is equally professional. A big thank you.“
Ferhat – Timberwise Customer
Reviews
Basement Waterproofing to Suit Your Property
Protect your home from damp, leaks and groundwater ingress with a basement waterproofing system designed for domestic properties.
Timberwise provides fully compliant basement waterproofing for homes, including cellars and below-ground conversions. We design and install systems in line with BS 8102, tailored to your property’s structure, usage and risk level.
Our residential solutions can include cavity drain membranes, sump and pump systems, and waterproof floor and wall treatments — all installed by experienced specialists and backed by long-term guarantees. Whether you’re converting a cellar or resolving ongoing water ingress, we focus on keeping your basement dry, usable and protected for the long term.
Robust basement waterproofing solutions for commercial and large-scale developments.
We work with developers, contractors, landlords and facilities managers to deliver basement waterproofing for commercial buildings, new builds and refurbishments. Our systems are engineered to meet BS 8102 requirements, with detailed design, risk assessment and technical support throughout the project lifecycle.
From car parks and plant rooms to storage areas and occupied basement spaces, we install high-performance waterproofing systems designed for durability, compliance and long-term reliability. Timberwise can integrate with wider construction programmes, providing clear documentation, warranties and ongoing support where required.
Four Steps to Perfect Basement Waterproofing
- Book Your Survey
First, get in touch with our team either online or by calling us on 0800 288 8660. Our customer service team will arrange a survey time that suits you.
- Our Surveyor Visits Your Property
One of our CSSW-qualified basement waterproofing experts visits your property to survey the basement and assess problem areas.
- Written Report
Our surveyor delivers a clear written report of their findings, including a no-obligation quote for any work needed to properly waterproof your basement.
- Schedule Any Necessary Work
Decide to go ahead with the work? That’s great! Our team will outline the type of work needed, timelines for completion, and ways to minimise disruption while the work is carried out.
Why Basement Waterproofing Is Essential in UK Properties
Basement waterproofing is essential for UK properties due to the country’s high rainfall levels, variable ground conditions and older housing stock. Without adequate protection, groundwater and penetrating moisture can enter below-ground structures, leading to damp, mould growth, timber decay and long-term structural deterioration.
Many basements were never originally designed to withstand modern living standards or changing environmental pressures, increasing the risk of water ingress over time. A professionally designed waterproofing system helps control moisture, protect structural integrity and create a safe, dry environment, safeguarding both the usability and long-term value of the property.
How We Can Help Protect Your Home
Residential basement waterproofing projects often involve very different priorities than commercial developments.
Homeowners are typically looking to stop active water ingress, prevent damp and mould, or safely convert a cellar into usable living space such as a home office, bedroom or family room. These projects require careful assessment of the property’s structure, ventilation and intended use to ensure the correct level of protection under BS 8102.
Timberwise provides tailored surveys and designs specifically for residential properties, recommending the most appropriate system and installing it with minimal disruption to the home. The result is a dry, safe and comfortable space, backed by long-term guarantees and specialist expertise you can trust.
The Timberwise Guarantee
All of our completed basement waterproofing installations are backed by a 10-year guarantee, giving you long-term confidence in the performance of your system.
Our guarantee reflects the quality of our design, materials and workmanship, and provides reassurance that your basement will remain protected against water ingress when installed and maintained in line with our recommendations.
For homeowners and commercial clients alike, it’s an added layer of security, protecting both your property and your investment for years to come.
Bespoke Waterproofing Solutions
At Timberwise, every basement waterproofing system we install is designed in accordance with BS 8102:2022 – Protection of Below Ground Structures Against Water Ingress.
Our CSSW-qualified specialists assess ground conditions, structural design and the intended use of the space before specifying the most appropriate solution. This ensures your system is not only effective, but fully aligned with current British Standards and building regulation expectations.
By prioritising compliant design from the outset, we reduce risk, protect your investment and provide documentation and guarantees you can rely on.
Timberwise designs and installs Type A waterproofing systems where barrier protection is the most appropriate solution. These systems involve applying specialist waterproof coatings or membranes to walls and floors to resist water ingress.
Often used in retrofit projects or where structural waterproofing is not feasible, Type A systems require careful surface preparation and expert detailing to perform correctly.
Our experienced technicians ensure every installation is completed to specification, with close attention to junctions, penetrations and vulnerable areas — delivering reliable, long-term protection.
Timberwise specialises in the design and installation of Type C waterproofing systems, also known as cavity drain membrane systems. Rather than attempting to hold back water, Type C systems manage and control it — allowing any moisture that enters the structure to be safely channelled to a controlled drainage point or sump and pump system.
This approach is particularly effective for existing properties, basement conversions and situations where ongoing groundwater pressure is a risk. Our CSSW-qualified specialists design each system in line with BS 8102, carefully assessing ground conditions and the intended use of the space to ensure the correct drainage capacity and pump specification.
Installed by experienced technicians and backed by long-term guarantees, a Timberwise Type C system provides a maintainable, reliable solution that keeps your basement dry, usable and protected for the long term.
Basement Waterproofing FAQs
Basement waterproofing is a reliable method of safeguarding your below ground space against the likes of flooding and slow leaks in your basement or cellar walls, as well as reducing the likelihood of condensation and black mould building up.
Waterproofing your basement or cellar allows you to make the most of your properties additional below ground space, giving you the additional floor space to add a new bedroom, bathroom, kitchen, or even just extra living space, without the worry of water damage ruining everything at any moment.
Any property with areas below ground level or built against retaining soil may require waterproofing.
This includes basements and cellars, homes built into hillsides, lower ground-floor flats, and buildings with retaining walls or semi-submerged walls. Garages, plant rooms and storage areas can also be at risk.
The cost of basement waterproofing depends on a few different factors. With every basement waterproofing project being bespoke, it’s hard to give a ‘one price for all’ quote.
Instead, we price based on considerations such as the size of the basement, if any waterproofing measures are already in place, and the materials that would need to be used.
It’s important to remember though that basement waterproofing is an investment, as it protects our below ground space, making it usable and adding value to the property in terms of habitable and dependable square footage.
Yes, basement waterproofing improves your property’s value by preventing water ingress, damp, and structural damage, whilst at the same time increasing the amount of living space available.
A waterproofed basement is a key selling point, and it could give you an edge over neighbours when it comes to selling your property.
Whilst there are a few different methods of waterproofing, none opf them are better than any other, they only serve different purposes.
Type A Waterproofing for example is designed to stop moisture from entering the basement entirely, whilst Type C is designed to collect and funnel away water once it has entered the basement.
The best form of basement waterproofing is to use at least two types in conjunction, so that you can live safe in the knowledge your basement is protected.
BS8102: 2022 serves as the current Code of Practice for Protection of Structures Against Water Ingress, a document that sets out the regulations and requirements regarding below ground waterproofing thrtoughout the UK.
Absaloutely, our basement waterproofing experts are capable of providing both Type A and C waterproofing solutions on top of concrete, brick, stone, and any other building material you might need protecting.
You can 100% waterproof a basement by using a combination of Type A and Type C waterproofing.
The Type A waterproofing, also known as tanking, will act as a protection against water ingress on your basement’s walls and floor, whilst the Type C waterproofing, known as a cavity drainage system, will catch any moisture that does make it’s way through your walls before pumping it away from your property, leaving the basement itself completely dry.
If installed properly and by qualified waterproofing experts, basement waterproofing can last decades.
With routine maintenance booked in for the likes of a connected sump pump, you can live comfortably in the knowledge that your basement is safely waterproofed for years.
Need a Basement Waterproofing Survey?
If you would like to benefit from the experience and knowledge of our basement waterproofing experts, and make the most of your below ground space, you can get in touch with our team by calling us on 0800 288 8660, or by filling in our online contact form to arrange a free basment waterproofing survey.
