M J Rooney is an award-winning basement company with over 30 years in the basement industry. Find out more about our basement services below.


M J Rooney are fast approaching their 40th year of London basement construction, which makes us one of the oldest basement specialists around. The second generation of Directors are Eoin Rooney, Cormac Rooney & Dermot Rooney who are all educated to degree level and have a lifetime of experience in basement construction. They lead a team of basement specialist project managers, civil engineers, architects and surveyors that make up an award-winning team leading the way in the London basement industry. M J Rooney’s site team are highly experienced and trained to deliver complex and detailed basement projects to the highest standards.


M J Rooney specialise in the design and installation of basement waterproofing in London and Kent. All waterproofing is designed and managed in-house by a specialist building surveyor and team of CSSW surveyors (Certificated Surveyor in Structural Waterproofing). As members of the PCA, MJ Rooney are subject to regular external audit to ensure that high standards are maintained. Our highly trained professionals install a wide variety of waterproofing systems to the highest quality and all works are covered by our 10-year insurance backed guarantee. In 2021 The Property Care Association awarded M J Rooney ‘Structural Waterproofing Contractor of the Year’.

Award Winning Basement Specialist

M J Rooney have received many prestigious awards in recognition of their contribution and achievements in the basement industry. Ground Engineering Magazine awarded M J Rooney “Ground Engineering Contractor of the Year” in 2017 and Construction News awarded M J Rooney UK wide “Contractor of the Year’ in 2017 & 2018. M J Rooney are incredibly proud to have such a team of exceptional people punching well above its weight in UK construction and the London basement industry.

Basement Technology

Technology is at the heart of delivering safety, quality and efficiency in basement construction for M J Rooney. We develop a 4D model for every project to show how the three-dimensional environment will change over time. We use the same technology to help us develop temporary works schemes and to find an easy route through the party wall process. Based on this use of technology in basement construction, M J Rooney were awarded “Digital Construction Excellence” in 2019 by Construction News. New Civil Engineer magazine gave the award for UK ‘Technology Champion 2017’ and “Design Innovator 2019”.

Health and Safety

Basement construction health and safety, requires attention to detail. M J Rooney have a highly trained and competent workforce with a wealth of experience in the various types of basement construction. Construction News awarded M J Rooney with the UK ‘Training Excellence’ Award in 2018 which was greatly received by the MJ Rooney team for their efforts in setting the bar in health and safety within the UK construction industry.


M J Rooney offers a 10-year guarantee on all of our projects. We carry professional indemnity insurance for our design in temporary works, drainage design and structural waterproofing design. We also offer an insurance backed guarantee on the structural waterproofing in the unlikely event that we were no longer trading.

As ASUC members and through our insurance partners we can offer a full range of guarantees and latent defect policies to provide security to your investment into a basement.

Basement Industry Leaders

M J Rooney strive to set the benchmark in the UK basement industry through trade associations, conference speaking and delivering CPD training to businesses. Cormac Rooney has spoken in front of hundreds of delegates at New Civil Engineers ‘Techfest Conference’ and at the ‘Ground Engineering Conference’, Dermot Rooney has spoken at the Greenwich Business Chamber of Commerce. Together, they gave a well-received presentation to hundreds of delegates at the ‘International Structural Waterproofing” conference on the topic of ‘Advanced Technologies in Basement Waterproofing’.

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