MacLennan is a well-established, family-run company with over 30 years of experience, delivering basement waterproofing solutions across the UK — from design to installation. Whether it’s for residential new builds or large commercial structures, they design, install, and fully guarantee long-term systems that work.
MacLennan works with many of the UK’s leading engineering and architectural practices to deliver best-practice, best-value basement waterproofing — getting it right the first time.
They cover everything from new build and historic basement conversions to leak repairs, gas-proofing, and concrete deck waterproofing — all in line with BS8102 standards.
Key Waterproofing Services:
- Waterproofing Historic Basements & Conversions
Planning to refurbish or convert an old basement or cellar that’s currently unused or prone to damp or flooding? MacLennan can help you turn it into a dry, functional space — whether you’re imagining a wine cellar, home office, or an extra bedroom, they’ll make sure it stays fully protected and watertight. - New Build Basement Waterproofing
Waterproofing design and installation for new build properties. MacLennan design and install waterproofing systems using the best and most suitable approach for each individual project. All work is covered by £10 million professional indemnity and product insurance, ensuring full protection across every stage of the process. - Leaks & Floods
MacLennan investigate and resolve leaks in all types of structures — from large commercial basements to smaller residential ones. - Gas Membrane
MacLennan design and install gas-resistant basement waterproofing systems using a range of solutions — including external gas membranes, internal spray- or roller-applied membranes, and radon barriers. If you’re building a basement, site investigations must include checks for ground gases. MacLennan, working alongside trusted partners, offers combined solutions that address both waterproofing and gas protection in one integrated approach. - Concrete & Deck Waterproofing
A concrete deck or buried roof typically forms part of an under-garden structure and often extends beyond the main footprint of the building as part of a larger basement space.
Basement waterproofing can feel complex and high-risk, but with trusted specialists like MacLennan, you can move forward with confidence — completing your project safely, efficiently, and to the highest standard.
👉 Planning a basement project? Get in touch with MacLennan to design it right from the start.
