The London Conversion Company LTD is a specialist basement and renovations contractor, designing and creating prestige homes throughout the London boroughs. With 30 years experience in underpinning and basement construction The London Conversion Company will aid you throughout all aspects of the build delivering high quality of service and finished basement project.

The London Conversion Company are specialist’s in basement conversions, basement excavations, basement waterproofing and basement conversion finishing.



The London Conversion Company Ltd is predominantly a basement excavation / basement conversions contractor working within London. Many people believe that basement conversions are a new residential construction product, however basement conversions / basement excavations have been carried out in London working for almost over 30 years. Our vast managerial experience of basement excavations gives our basement teams access to an exceptional wealth of knowledge. All our basement excavations are overseen by a dedicated basement excavation / basement underpinning project manager ensuring quality workmanship and a hassle free basement excavation experience to our clients.



Early basement conversions where generally the afterthought of an underpinning project or the simple transformation of an existing cellar space, however basement conversions today are large scale specialized construction projects ranging from generally 4 months – 2 years in duration. The specialized nature of having a basement conversion requires architectural design, structural engineering calculations/drawings and a dedicated basement contractor with the knowledge required to carry out such works. Some councils require for planning applications a “basement impact assessment” and at times basement temporary works propping designs both of which we can carry out on your behalf.

Richard Jackson

/ North London

It is my personal opinion that my basement conversion has been carried out to the highest standard and I am absolutely delighted with the end result.

John & Sarah

/ West London

The London Conversion company were creative in their thinking, making the best use of our home, designing us a superb living space.

Lisa & David

/ North London

We are extremely pleased with our basement conversion and found from day one the London Conversion company were very professional and competent.