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Company Information

4Site Construction Ltd has been established for over a decade, and in that time we have developed a reputation as experts in basement construction and conversion, vault conversions and specialist foundations.


The majority of our basement conversions are carried out within London and the Home Counties. However, our reputation has led to high demand for our services across the country, which is why we now find ourselves carrying out basement construction activities within all areas of the UK.

Client Focused Basement Solutions

In recent years, increased property prices have caused homeowners to look for alternatives to moving. The perfect solution has been found in extending homes downwards with single storey and multi-level basement constructions. With this increased demand for basement conversions and basement constructions, we have tapped into our industry knowledge and experience and naturally evolved into a client-focused provider of basement solutions,

Our services

Our highly skilled team offers a full service from conception, design, build and fit-out. We always work closely with our clients to ensure that their basement vision is achieved and that every stage of the project is managed and monitored in order to meet time and budget targets, with our ultimate objective being maximising client satisfaction.

If you have a project in mind and would need some assistance, we would be delighted to help.
Please feel free to contact us on: 0203 137 4588
Alternatively, please use our contact form if you have any enquiry