Our Basement Underpinning service delivers a reliable, robust solution for creating or expanding basement spaces beneath existing buildings. Whether you’re converting a ground-floor property into a full basement, or strengthening foundations to accommodate new loads, we specialise in underpinning works that ensure structural safety, durability and longevity.
Underpinning is more than digging deeper. We engineer extensions of your building’s foundations, transferring load to stronger ground below —and often allowing for additional habitable space or enhanced structural integrity. Our approach includes detailed assessment, precise excavation, reinforced concrete and water-management systems to safeguard both your property and investments.
Our team works with specialist structural engineers and complies with all UK regulations, giving you full peace of mind for this complex engineering task.
Our proven process covers every stage of the project to ensure a seamless finish from site-survey to completion:
Site assessment & structural design
We begin with a site survey to inspect the existing foundations, ground conditions and any specific restrictions (e.g., party walls, live services, neighbouring properties). Based on our findings we coordinate with structural engineers to produce a bespoke underpinning plan.
Preparation & monitoring
Once agreed, we prepare the site by protecting adjacent structures, installing temporary works if needed (propping, bracing), and setting up instrumentation or monitoring where required. Safety of nearby buildings and inhabitants is our priority.
Excavation & load-transfer
We execute controlled excavation in sections around the perimeter or beneath the structure per the design. As each section is excavated we install reinforced concrete underpinning units – or use alternative methods (pile/beam systems) where specified.
Final waterproofing & drainage
With the new foundation in place, we apply waterproofing membranes, install drainage systems and ensure that the basement space remains dry, protected and ready for future use.
Finishing & handover
Once underpinning is complete, we back-fill and compact where needed, restore any disturbed finishes, and hand over the space ready for the next phase of build or conversion.
Enlarging basement space (light & useable rooms)
Strengthening foundations for structural extensions (lofts, additional storeys)
Improving settlement-prone properties or transferring load onto firmer strata
Creating lower-ground level gym, cinema, utility or plant areas
Renovation of older properties where original foundations are inadequate for modern usage
With decades of experience in structural works, our team brings meticulous attention to detail and compliance with the highest standards of safety and performance. We coordinate all necessary design input, adhere to Building Regulations and work flexibly to minimise disruption. From heritage conversions to new build basements, we’ve delivered high-quality underpinning projects throughout London and surrounding areas.
We’re here to make your construction journey seamless and stress-free. Whether you have questions, need a quote, or want to discuss your project, our team is ready to assist you every step of the way.
Contact us today, and let’s turn your vision into a structure you can be proud of.
