Basement Waterproofing

As an independent company, we can choose the appropriate products to suit the large variety of properties we are called on to waterproof.

MacLennan design, supply, and install waterproofing systems across London and the rest of the UK that comply with BS8102 and all third party warranty provider's requirements.

We can save money and protect clients with expert basement waterproofing design.

The following pages will set out your options for combining systems for the type of basement construction you are considering.


To comply with British Standard BS8102/2022 and Third-party warranty providers you need to appoint a CSSW qualified waterproofing specialist onto the design team before technical design (RIBA 4).

This new requirement does not mean take advice from a designer,  it does mean the CSSW  expert has to be a design team appointment and have PI for the advice and design given from early design to completion of construction and waterproofing.

They must have suitable experience and be able to advise on all systems and options as well as buildability, repairability, sequencing, protection, hazards, CDM, MacLennan work with many of the market leading engineering and architecture practices in the UK to design best practice, best value guaranteed basement waterproofing solutions.

The waterproofing design team
The waterproofing design team

What are you looking to waterproof?

New Builds

New Builds

A new build residential structure or basement of any construction & size

Concrete & Deck

Concrete & Deck

Concrete decks above basements or flat roofs

Leaks & Floods

Leaks & Floods

Solutions for leaking, flooding or cracked below ground structures / basements

Commercial Buildings

Commercial Buildings

Hotels, Office blocks, Stadiums, Carparks & Multi story basements

Historic Structures & Basement Conversions

Historic Structures & Basement Conversions

A basement / cellar conversion under an existing property

Gas Proofing

Gas Proofing

Gas proof your basement to prevent Radon, Methane, Carbon Dioxide and any other ground gases.

Get in touch with our technical team today!

MacLennan have been experts in designing, installing, and guaranteeing systems for over 30 years.

Waterproofing systems designed and installed by MacLennan are covered by £10 million PI.

MacLennan work with main contractors and developers to deliver projects under the latest HSE regulations, on time and fully guaranteed using our own fully employed, experienced and qualified workforce of waterproofing technicians.

It's important that your waterproofing solution is BS8102 compliant. Read our BS8102 Guidance for Compliance.

Environmental Policy

MacLennan strive to source our materials from the most sustainable sources possible and participate in pioneering recycling schemes.

As a company that designs, supplies and installs waterproofing, our supply chain is shorter than most and we consciously select the best products for resilience.

In need of a specification for a project?

Upload your plans and a brief description of the project and a member of our team will get in touch!

In need of a quick spec?

Your details

Project Details


Why should I work with MacLennan?


We Design, supply and install. There's no split responsibility with MacLennan.


MacLennan live and breathe waterproofing, have a look at one of our free CPD seminars and find out!


MacLennan has the most comprehensive guarantees and insurances in the industry.

What are the main causes of water in the basement?

Related Projects

We have been entrusted with significant contracts such as The Houses of Parliament, Kia Oval, Olympic Park Media Centre, Hilton Hotels, Barratt Homes Head offices and hundreds of high end residential properties.

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Get in touch!

Ready to start a project or require more information about us?
Call us about your project or problem and we will be happy to help.

Call us today on:

0330 3200 240
Or email us here