Struggling for living space? Don’t want to move home? Extended outwards, upwards and sideways or just can’t make it work? If you’re looking to expand your home, a London basement construction is one of the most valuable ways to unlock additional living space in your home, and it’s never been simpler than with London Basements.
As property value rises across the region, homeowners and developers are increasingly turning to basement design and build in London to create additional floor space without compromising gardens, footprint, or character of the home. London Basements specialises in delivering high-performance structural solutions built for longevity, structural integrity, and regulatory compliance.
We’ve worked on over 2,000+ London basement projects, across 45 years. Below, we break down exactly the services that make up our portfolio of 2,000+ projects.
London Basements - Design and Build
Basement projects in London, Greater London and beyond demand technical knowledge, geological understanding, and robust risk management. Every London basement design and build involves obtaining planning permission, ground conditions assessment, waterproofing strategy development, and structural reinforcement planning to protect neighbouring properties - especially where party wall boundaries and older construction forms are present. London Basements provides early-stage feasibility, engineering coordination, and construction-stage delivery to ensure basements remain structurally sound, dry, and fully habitable long-term.
Shell & Core Basement Construction
London Shell & Core construction forms the backbone of a new or extended lower-ground level for London homes. This involves deep excavation, structural wall formation, waterproofing membranes, and primary services routing. For townhouses and period homes, Shell & Core works must be executed with minimal movement tolerance to prevent subsidence and cracking in upper floors. London Basements ensure that soil retention, underpinning sequences, and temporary support strategies are engineered to suit London, Greater London’s dense urban landscape.
London Basements, we provide:
- Dual-layer waterproofing systems
- Reinforced concrete walls and slab installation
- Early integration of drainage and sump pump systems
Substructure Works in London
Substructure works in London create the underground foundation needed to support the upper structure. This work often involves strengthening shared walls, managing loads during deeper digging, and building strong retaining walls. Every basement needs a unique design because soil conditions and building types vary. That's why we specialise in experience, teamwork in engineering, and careful planning. London Basements ensure compliance with Building Regulations:
- Part A (Structure)
- Part B (Fire Safety)
- Part C (Site Preparation & Resistance to Contaminants)
Temporary Basement Works & Design
Basement excavation relies heavily on safe structural restraint, which ensures collapse risk is minimal while ensuring stability during the entire construction process. In London, neighbouring structures often sit within millimetres of excavation boundaries, so temporary works must be engineered with precision. At London Basements, we work with specialist structural designers to implement propping systems and schemes, needle beams, façade retention systems, and staged underpinning during basement works. Essentially, these processes help ensure structural integrity and safety during deep excavation and building.
London Basement Contractor Design
Basement design or London CDP (Contractor Design Portion) enables London Basements to take design charge of constructional elements. This streamlines approval pathways, reduces friction between consultant teams, and accelerates project delivery. CDP is especially useful for custom details - including structural steps, retaining walls, complex waterproofing junctions, and internal load transfer steels - where contractor-led detailing ensures buildability at site level.
London Structural Alterations
Many basement conversions involve opening up lower ground levels, relocating stair cores, or creating double-height voids. These basement structural alterations ****require methodical temporary support and engineered sequencing. Structural alteration contractors like us undertake works including steel frame installation, wall removal, façade support, and integration of new structural openings - all executed with the assurance of structural engineers, building control approval, and professional project governance.
Enquire About Basement Design and Build in London, Greater London
If you are planning a basement design and build in London, Greater London and beyond, at London Basements, we’ll support with planning, design, and delivery. Take a look at our portfolio of projects or reach out to London’s basement contractors here.
Click here to contact our team and arrange an initial consultation.