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Basement Company London – Abtech

Here at Abtech Basements we offer our expert services in the construction and waterproofing of new or existing basements. With over 45 years in industry, we are a well-known basement conversion company in London and Oxford. All of our staff are highly skilled and fully trained so you can have peace of mind that your property is in safe hands. 

London Basement conversions - Abtech

A Basement Company

Specialising in basement structures and conversions;
of new build and existing basements and cellars.

Create extra living space in your home, whether it be a new build or retrofit project.

Working throughout the South of England, including North London, South London and Oxford, plus many projects in West London, Fulham, Chiswick and Chelsea.

Reputable, experienced, professional and trustworthy, Abtech offers an expert service in all areas of basement construction.


Retro Fit basements or cellar conversions 

Our wealth of experience in underpinning, temporary works and excavation within an existing property, allows us to provide a comprehensive package for your planned basement.

New Build

New level for design stage of a new build

Providing basements structures for new housing including piling, excavation, drainage, pumping systems and the reinforced concrete structure ready for your house to be built over.

Structural Waterproofing

Basement waterproofing/cellar conversion

Our waterproofing department specialise in providing effective solutions for modern day expectations of a dry environment using modern products and techniques.

Geobond Logo


Our sister company,
constructing our piled solutions

considerate constructors logo

Considerate Constructors Scheme 

Proud to be members and award winners

Delata logo


Certified Delta waterproofing installed

logo CGS


Providing insurance backed
guarantees for peace of mind

Chas logo


Our trusted advisor on
health & safety compliance