WJB Groundworks is one of London’s most trusted basement contractors. We deliver high-quality basement construction services for residential and commercial properties across Greater London. Established in 2014, our team brings over a decade of hands-on experience in structural groundworks, basement excavation, underpinning, and reinforced concrete construction.
Every site is different. Our team tailors each approach to your specific ground conditions, plot constraints, and structural requirements. Results are delivered with minimal disruption and consistent precision.
We assess your ground conditions first, then develop a bespoke construction plan built around your vision. Our expertise covers reinforced concrete foundations, underpinning solutions, damp proofing, and complete basement builds. Every project is designed to grow your usable space and strengthen your property’s long-term value.
GET A QUOTE
Consult with our specialists and book an on-site inspection at your convenience. Contact us at 02037541809, or email us at info@wjbgroundworks.com for a bespoke quote. Visit our portfolio and explore the projects we have conducted successfully.
Project Completed
Customer Satisfied
Expert Team Members
Awards Winner
London’s property market places a high premium on space. Building downwards is one of the most cost-effective ways to expand your floor area without losing garden space or conflicting with planning height limits. In Greater London, every additional square metre carries real financial value.
Basement construction is also remarkably versatile. A well-designed lower-level space can become a home cinema, gym, rental unit, or commercial utility area. It adapts to your needs over time. Unlike above-ground extensions, basement builds are largely hidden from view, giving them a better chance of clearing planning requirements with fewer objections.
WJB Groundworks combines structural engineering expertise with advanced excavation techniques and a thorough knowledge of London’s ground conditions. Our integrated team manages every phase, from initial feasibility through to final handover, with precision and full accountability.
We survey the land, test the soil, and prepare the site for construction, identifying ground conditions and the safest approach before work begins.
We excavate to the required depth and install strong reinforced concrete foundations to provide a stable, load-bearing structural base.
We build the structure and apply damp-proofing and waterproofing solutions in accordance with BS 8102 to prevent any moisture issues.
We complete all finishing work to your specification and carry out final quality checks before handing over a fully documented project.
Whatever your goal, WJB Groundworks delivers basement construction services built around it. We work with homeowners, developers, and commercial clients to maximise the potential of every site. We specialise in new builds and existing structures alike.
Every project complies fully with UK Building Regulations and relevant safety standards. Our award-winning safety team protects everyone on site and gives clients confidence at every stage.
GET A QUOTEWJB Groundworks prides itself on delivering construction at its finest. Here is what sets us apart:
Clear quotes with no hidden costs.
Dedicated groundworks and basement construction professionals.
Strict adherence to UK Building Regulations and planning requirements.
Trusted by residential and commercial clients since 2014.
Precision-led delivery with no compromise on quality.
Proactive hazard identification and mitigation on every project.
Led by a recognised, dedicated safety team.
Single point of contact from start to finish.
Full in-house technical capability.
A testament to our reliability and client satisfaction.
Ready to get started? Contact WJB Groundworks, London’s trusted basement construction specialists.
STEP -01
We survey the land, test the soil, and prepare the site for construction.
STEP -02
We excavate to the required depth and install strong reinforced concrete foundations.
STEP -03
We build the structure and apply damp-proofing and waterproofing to prevent moisture issues.
STEP -04
We complete all finishing work and carry out final checks before handover.
Consult with our specialists and book an on-site inspection at your convenience. Contact us at 02037541809, or email us at info@wjbgroundworks.com for a bespoke quote. Visit our portfolio and explore the projects we have conducted successfully.
The cost is influenced by the size and depth of the excavation, ground conditions, structural design complexity, waterproofing specification, and the level of finishes required. We provide a clear, itemised quote after carrying out a site assessment.
Yes. We excavate beneath the ground floor of the existing property using underpinning and structural support systems to create a safe, lower-level space. This can be undertaken as part of a renovation or as a standalone project.
Limited sunlight and the surrounding soil naturally regulate the temperature of a basement. In winter, improved insulation, central heating, and draught sealing around doors and windows will maintain a comfortable temperature.
Yes. The additional square footage directly increases the market value of your property. Basement construction is regarded as one of the strongest-returning property investments available in Greater London.
Basements can be used as a home cinema, gym, guest bedroom, home office, playroom, utility room, additional living space, or as a rental unit. The design can be tailored to your specific requirements.
Many basement projects qualify under Permitted Development rights and do not require formal planning permission. However, listed buildings, conservation areas, and larger or more complex projects typically require a formal planning application. We can advise on the requirements for your specific project.
A typical residential basement build takes between 10 and 20 weeks from excavation to handover. Timescales depend on size, depth, and ground conditions. Our project managers provide a clear programme from day one and keep you updated throughout.
Underpinning strengthens and deepens existing foundations to allow safe excavation beneath a property. It is typically required when building a new basement under an existing structure or lowering the floor level of a cellar. WJB Groundworks carries out all underpinning works with full structural oversight.
We apply Type A (tanking), Type B (structurally integral waterproofing), and Type C (cavity drain membrane) systems in accordance with BS 8102. The appropriate system, or combination of systems, is selected based on the design and ground conditions.
Some noise and vibration are unavoidable during excavation. We adhere to local authority working hours, communicate clearly with neighbouring occupants, and manage the site considerately. A Party Wall Agreement is usually required beforehand, and we can guide you through this.
Yes. Our services extend to commercial, mixed-use, and residential developments. Commercial basements are commonly used for storage, plant rooms, car parking, and additional operational space.
Our engineers assess the existing structure and surrounding ground conditions before work commences. We utilise temporary propping, shoring, and staged excavation techniques to maintain structural integrity throughout the build process.