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Basement Construction in London

Your basement offers so much potential to expand your property. Work with experienced basement construction specialists to achieve the result you deserve.

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Basement construction is the perfect way to enhance your property, providing a functional space underneath your building. We have the ability to transform existing basements as well as building below ground level to create a new space within your project. Whether it’s creating a storey below ground level or even two, our basement construction specialists are experienced undertaking solutions for cleared development or commercial sites.

With each basement project we undertake, we allocate a main project manager who will take ownership of that specific construction or conversion project. Our staff are fully supported and enabled to deliver the project for our clients in a timely and cost effective manner.

Basement construction allows us to safely transform the space under ground or under the original footprint of your property, creating an additional level fit for any purpose. Although we predominantly undertake basement construction in London, we also work in surrounding areas and across the South East of England.


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living room


basement conversion in progress

Discuss your Basement Construction in London Today

At 4site we have built a reputation for the care and skill applied whilst planning and building our clients basements. With over 35 years of experience in the construction of both residential and commercial basements, you can be assured that your project is in safe hands. We have what it takes to provide you with a dynamic and bespoke space you can get use out of for many more years to come.

If you are interested in basement construction in London, contact us today to discuss your project ideas. As experienced basement construction specialists, you can be rest assured your project is in safe hands. Our professional team will discuss the best solutions for you and help implement your designs.

Working with Basement Construction Specialists

The possibilities for basement construction are endless, meaning you can develop your property to suit the needs of your project. We carry out basement construction in existing developments to create a whole new level of habitable space underneath an already multi storey development as well as residential work.

If you are looking into basement construction for your home and want to create a games room to keep the children entertained, luxury underground wine cellar or even a swimming pool to splash about in, finding accredited basement construction specialists can make all of this possible.

Basement construction can be carried out in multiple ways, all of which will allow you to maximise the space you already have:


basement construction

Enhance your property with reliable construction services

Why Choose 4Site Construction?

Upmost Attention to Detail

Upmost Attention to Detail

Practicality, safety, longevity and aesthetics are never overlooked by our professional team.

Full Project Managment

Full Project Managment

Years of experience providing quality solutions to meet our clients’ goals has allowed us to perfect the process.

Independant & Flexible

Independant & Flexible

Working around your schedule, count on our team to carry out their work in the most efficient way for you.

Maintaining Professionlaism

Maintaining Professionlaism

Maintaining our high standards at all times, the team are all extremely experienced within the industry.

Responsible & Unobtrusive

Responsible & Unobtrusive

We keep disruption to your daily life as limited as possible, keep you informed through every step of the process.

Case Study

Pittshanger Manor and Café, Ealing

4Site excavated and built the basement, lift shaft and internal structural works for the Museum. We then built the café from foundations to completing the whole envelope with a brick finish. These works were all done for the main contractor.

service icon Basement
length icon 19 Months
Case Study

Camden, London – Mixed Use

The developer on this project has us work on a basement from a level site and the RC frame for a 6 storey building. Underpinning and waterproofing also made up part of these work

service icon Basement
length icon 22 Months


Sub-Basement Construction

For larger basements, multi-layer basement construction in London has become increasingly popular. With property owners realising they can work alongside basement construction specialists to expand their space, it is a great way to maximise the endless opportunities within your existing property.

As established basement construction specialists, we can help to create useable space on multiple levels below your property. Not only do additional levels allow your property to grow to accommodate your needs, but you should even see the value of your property increase.


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Under Garden Conversion: Open Excavation

It is not just your property that has potential for basement construction in London; your garden provides a wealth of opportunities for the creation of usable under garden space. If you have ever thought about an extension but not wanted to take over your outdoor space, have you considered an underground garden conversion?

Open excavation allows us to extend your property as far as your garden will allow. Our basement construction experience makes us confident that we can tailor a solution to make your dream conversion a reality. We are here to ensure your basement construction is fully waterproofed and that the foundations are safe, secure and long lasting.


The Party Wall Act

Established in 1996, the Party Wall Agreement sets out legislation to assist in the resolution of disputes between neighbours in respect to boundary walls, party walls and adjoining or adjacent properties. It dictates that any individual proposing to carry out building work which comes under the remit of the Act must give their neighbours notice of their intentions, including a full Method Statement.

As experienced basement construction experts, we can work with you to ensure your build complies with all of the relevant regulations and legislation. We recognise that these matters have to be handled with sensitivity and tact and can negotiate on your behalf in order to maintain good relationships.

    Get Your Free Quote Today!

    Our expert team are always on hand to offer advice and recommendations for your construction project. Get in touch today for a free no obligation quote or give us a call on 01376 311 133 .