WHL PROJECTS - RESIDENTIAL SECTOR
Underpinning & Basement Conversions
Strengthening and transforming properties from the ground up
SERVICE DETAILS
Underpinning & Basement Conversions
WHL Projects delivers underpinning and basement conversion works for homeowners, developers, and property professionals across the UK. Our expertise spans from localised foundation stabilisation to full excavation and waterproofing of new basement levels. We bring the precision and safety of a main contractor to complex below-ground projects — managing structure, sequencing, and compliance every step of the way.
Our capabilities
We provide a complete structural service including:
- Traditional mass-concrete underpinning
- Mini-piled and reinforced beam underpinning systems
- Basement excavations and structural enlargements
- Retaining walls, lift pits, and service voids
- Structural waterproofing and tanking (Type A, B & C systems)
- Foundation stabilisation and movement control
- Structural repairs and reinstatement
Each project begins with a detailed assessment of existing foundations and soil conditions. We work with engineers and surveyors to design the most appropriate method for the building and its environment, ensuring long-term stability and minimal disruption to surrounding structures.
Basement conversions and new formations
Converting or forming a basement is one of the most demanding types of residential work. It requires precise engineering, careful sequencing, and robust waterproofing. WHL Projects manages the process end-to-end — excavation, underpinning, waterproofing, drainage, and fit-out.
We coordinate with design teams and Building Control to ensure every phase is properly inspected and signed off. Basements are formed using reinforced concrete, structural steel, and waterproofing systems integrated for durability and compliance.
Ventilation, lighting and drainage are incorporated into the early design to create dry, comfortable, and useable spaces — ideal for additional living accommodation, gyms, or plant rooms.
Underpinning and structural stabilisation
Our underpinning operations stabilise buildings affected by movement, settlement, or nearby excavations. We use traditional and mini-piled methods depending on ground conditions and access. Each stage is carefully sequenced and monitored to prevent differential movement and ensure safety.
Temporary works and support systems are installed before excavation begins. All underpinning pits are excavated, concreted, and cured under close supervision. We maintain open communication with engineers and clients throughout the process.
Waterproofing and protection
WHL Projects integrates waterproofing and tanking directly into basement and retaining-wall works. We use manufacturer-approved systems such as Sika, Newton, Delta Membranes, and Triton, providing designs and warranties backed by manufacturer inspection and certification.
Drainage channels, sumps, and pumps are designed for maintainability and long-term reliability, ensuring protection against groundwater ingress.
Health, safety, and environment
Underpinning and basement work involves confined spaces, excavation and heavy lifting — all controlled through detailed method statements, safe systems of work, and continuous supervision. We maintain air quality, manage dust and spoil removal responsibly, and use vibration monitoring where required in built-up areas.
Where projects take place in occupied or neighbouring properties, we ensure clear communication, protection, and sequencing to keep disruption to an absolute minimum.
Technical assurance and quality
Our sister company, WHL Surveying & Engineering, regulated by the Royal Institution of Chartered Surveyors (RICS) and the Institution of Structural Engineers (IStructE), provides technical support and certification throughout. This collaboration ensures every project meets professional structural standards and Building Control requirements.
Why choose WHL Projects
Proven expertise in underpinning and basement conversions across the UK
Full design, build, and waterproofing capability under one roof
Safe, precise delivery by experienced structural teams
Minimal disruption and clear client communication
Certified engineering oversight for total assurance
Secure and expand your property with WHL Projects
From small-scale foundation stabilisation to full basement construction, we provide the technical strength and site expertise to deliver dependable results.