New Build Basement Waterproofing

MacLennan design and install basement waterproofing systems for new build properties. We were part of the team that wrote the new British Standard for waterproofing: BS8102 2022.

As the authors we can ensure you comply.

Basements are one of the most critical areas of construction and conversions. According to the New BS8102 - 2022 the waterproofing must be designed by a qualified, suitably experienced, Waterproofing Design Specialist appointed to the design team before technical design, RIBA 4.

Failures in the waterproofing system can be disastrous and expensive to remedy so the designer must have 10 million PI and accept full design liability.

Waterproofing a basement is a project which has to be carried out by specialist professionals with insurance for basement waterproofing to ensure a trouble-free contract.

MacLennan work as delivery partners for the major waterproofing materials manufacturers but the manufacturers will not take on design liability so should not be doing the design.

MacLennan design and install waterproofing solutions using the best and most suitable system available for each project. All work is covered by £10 million PI and products insurance which covers all aspects of the work.

What construction type are you waterproofing?

The Importance of Basement Construction Types.

There are several methods of waterproofing a basement in new build homes and each form requires a different type or combination of waterproofing.

The waterproofing is designed to achieve a grade of environment suitable for the intended purpose, contents and finishes of the proposed basement according to table 2 of BS8102. The grades have changed in the 2022 update of BS8102:

These grades are achieved by a combination of three types of waterproofing. It is a requirement of British Standards and all insurance companies that you consider two forms of waterproofing if the consequence of a leak is unacceptable, or the rick of a leak is high.

As a company of highly qualified waterproofing designers and specialists, we strongly As a company of highly qualified waterproofing designers and specialists, we strongly disagreed with some grades in the British Standards which is why our MD Ian MacLennan and a small specialist team have completely re written BS8102.

If you'd like to learn more about new build basement contructions, we offer CPD seminars for industry professionals.

Get in touch with our technical team today!

MacLennan are experts in designing, installing and guaranteeing waterproofing systems for over 30 years.

According to the institute of civil engineers in their document 'Reducing the Risk of Leaking Substructures', 50% of basements leak during construction and a significant number continue to leak after construction.

This is unacceptable and can be easily avoided with a basement waterproofing expert's design.

Large New Build Basement
A gigantic new build basement Waterproofing system designed, supplied and installed by MacLennan

New basement waterproofing failures are normally down to poor design and installation by non-specialist contractors.

Our specialist team of waterproofing technicians have over 30 years' of experience in designing and installing waterproof systems. MacLennan offer a full design and installation service to avoid liability and leaks.

The MacLennan design team work directly from drawings in auto-CAD or PDF that our trained and experienced waterproofing technicians then work from to ensure the system is installed according to the technical design.

To discuss your basement waterproofing requirements, please get in touch with the MacLennan team.

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?

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