The 4 best basement waterproofing services in London to keep your home dry

• Experience: Selection was based on companies possessing proven experience in both residential and commercial sectors, with completed portfolios verified across diverse property types.

• Range of Services: Preference was given to providers offering a comprehensive suite of waterproofing solutions, including tanking, cavity drainage systems, and external sealing.

• Customer Service: Responsiveness and communication were evaluated through feedback from former clients, ensuring clear process explanations and tailored recommendations.

• Cost Transparency: Priority was given to establishments providing detailed, upfront quotes with clear cost breakdowns to prevent unexpected charges.

Unmanaged basement moisture can swiftly escalate from a minor inconvenience to a significant structural concern, encouraging mould growth and compromising a property's integrity. For London properties, where subterranean spaces are frequently converted into living areas or workspaces, professional waterproofing is an essential safeguard.

To help protect properties from damp and structural water ingress, the leading basement waterproofing specialists in London have been evaluated. Each provider has been assessed on technical credentials, range of solutions, pricing transparency, and client feedback.

How much does basement waterproofing cost in London?

Basement waterproofing in London typically costs between £2,000 and £5,000, depending on the dimensions of the area, the chosen waterproofing system, and the complexity of the project. For more extensive tanking or drainage work, the price may be higher.

1. Dampstar

Phone: +44 7376 700073

Business hours:

• Monday to Friday: 8 AM to 5 PM
• Saturday: 9 AM to 5 PM
• Sunday: Closed

Website

Dampstar specialises in bespoke solutions that address the root cause of damp and structural moisture, avoiding temporary remedies. The company implements modern systems, including cavity drain membranes, sump pumps, and tanking, to ensure basement spaces remain dry and functional.

Punctual and highly communicative, the team coordinates projects efficiently via direct messaging channels.

The works were completed ahead of time

“Excellent customer service. The works were completed ahead of time. All the mess was taken away. I will receive a guarantee for the work. Dampstar came around to check my house for damp spots. They negotiated on like-for-like quotes. The company has been established for many years and knows what they are talking about.”

Manjit Bance, Google review

Very impressed with the level of service & attention to detail

“Very impressed with the level of service & attention to detail from Dampstar. Andrew responded to my initial query quickly& arranged to survey my damp walls. His investigation & finding the root cause of the damp was spot on. Work was done neatly & with care. So happy to be rid of mould & damp. Highly recommend Dampstar!”

Charlene Govender, Google review

2. Universal Basement Waterproofing LTD

Phone: +44 20 3795 4900

Business hours:

• Monday to Friday: 8:30 AM to 5 PM

Website

Universal Basement Waterproofing LTD is known for detailed preparation work, stripping basements back to the bare structure before applying membranes to ensure maximum adhesion and longevity. As certified installers for premium brands such as Delta Membranes, Koster, and Sika, the company provides robust project warranties.

A comprehensive service is offered, spanning initial diagnostics to final structural refurbishment. Having a single team manage the entire project minimises coordination delays.

They diagnosed the issues quickly

“I had my basement waterproofed by Universal Basement Waterproofing Ltd, and I’m beyond impressed with their service. From start to finish, the team was professional, friendly and extremely knowledgeable. They diagnosed the issues quickly and provided a clear, no-nonsense plan for the work. Everything was completed on time and the results speak for themselves. No more damp or leaks, just a dry and usable space!”

Jordan Hall, Google review

I find them to be a very professional and diligent company

“I have known Universal Basement Waterproofing LTD for over 10 years now and have found them to be a very professional and diligent company. They take pride in the services they offer and have always striven to ensure that projects are completed on time and to the highest possible standard. I am happy to promote them for any waterproofing, concrete repair or refurbishment projects. A credit to the industry.”

Alex Lynn, Google review

3. OBS Basements LTD

Phone: +44 7594 954319

Business hours:

• Monday to Friday: 6:30 AM to 6 PM
• Saturday: 7 AM to 6 PM
• Sunday: Closed

Website

Backed by more than a decade of specialist experience, OBS Basements LTD integrates advanced waterproofing systems into structural designs from the project's inception. Their comprehensive installations include concrete piling, tanking, active drainage systems, and sump pumps.

The firm provides a ten-year insurance-backed guarantee on all completed works, reflecting a commitment to long-term structural integrity.

Quote was clearly itemised, very transparent, and stress-free

“OBS were fantastic from start to finish. They were able to begin work within a couple of weeks of our first meeting. They quoted an overall fee which covered everything, so no hidden extras! It was also clearly itemised, so the billing was just very transparent and stress-free. They organised every aspect of the project, including getting the steel frame fabricated, the skip, the electrician, deliveries, and various other moving parts. The workers were professional, skilled, on time, friendly, and flexible. The overall quality of work and customer service was fantastic. We also felt like we got good value for money. We would highly recommend OBS to anyone renovating their basement.”

James Smith, Google review

Their team is hard working, friendly and accommodating

“I have used OBS to carry out two basements for me in the last 5 years and have found them to be very hard working, friendly and accommodating on both jobs. David (business manager) is a pleasure to work with, and Kendall (business owner) makes sure he is in regular contact to check in that everything is going OK. The guys on site bend over backwards to be helpful. Through no fault of theirs, the first job ran into difficulties when the main contractor left the site, but they carried on regardless to deliver their portion of work on budget and on time. Thank you very much, Kendall, David and all the team. I hope to use them again in the years to come.”

Andrew Dangerfield, Google review

4. City Waterproofing LTD

Phone: +44 20 3633 2539

Business hours:

• Monday to Saturday: 8 AM to 5 PM
• Sunday: Closed

Website

City Waterproofing LTD is highly regarded for its diagnostic approach, identifying the root cause of moisture before proposing solutions. The company offers a broad suite of services, including basement tanking, rising damp treatments, and timber preservation.

The team has a reputation for being respectful and tidy on-site, completing projects with minimal disruption to the household and providing insurance-backed guarantees.

The quote they provided was upfront and reasonable

“Armond and his team were super professional and friendly. The quote they provided was upfront and reasonable, and the communication from Armond was fantastic. The work was completed quickly and to a great standard, and our home was left clean and tidy when we returned with minimal disruption.”

Sophie Farrier-Armson, Google review

Done promptly and to a very high standard

“Armand was very professional and responsive, which was reflected in the work his company carried out for me. It was done promptly and to a very high standard, and was fully documented for me to see.”

Joe Sharp, Google review

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