London Basement Construction & Waterproofing Experts
Building Strong, Dry, and Secure Basements Across London

Welcome to Delta Force Group Ltd — your trusted specialists in basement construction, waterproofing, underpinning, and structural groundworks across London. Whether you're planning a new build, converting an existing space, or protecting your home from water ingress, we deliver expert solutions tailored to your property.

 

Why Choose Delta Force

 

  • ✅ Over 15 Years of Industry Experience

  • ✅ Fully Insured & Accredited Specialists

  • ✅ Basement Projects from Start to Waterproof Shell

  • ✅ Expert in Structural Repairs & Underpinning

  • ✅ PCA-Approved Waterproofing Systems

  • ✅ Emergency Sump Pump Installations & Repairs

  • ✅ Free On-Site Surveys & Competitive Pricing

 

Our service's 

🏗 Basement Construction

From excavation to concrete shell, we handle the full structural basement build under homes, gardens, and extensions.

💧 Basement Waterproofing

We install full waterproofing systems, including tanking, cavity drain membranes, sump pumps, and resin injections.

🧱 Underpinning & Structural Repairs

We stabilise existing structures using advanced underpinning and reinforcement techniques.

⚒ Groundworks & Foundations

From piling and foundations to drainage and concrete slabs, we provide all supporting groundwork services.

By specialising exclusively in shell construction, Delta Force Group eliminates the guesswork and headaches of below-grade work. You get a single point of accountability for excavation, structure, waterproofing and drainage—so your general contractor or homeowners can focus on the finish line, not fight leaks or delays. Choose Delta Force Group and start your project with a truly solid, water-tight foundation

Build a solid, long-lasting basement shell using high-strength reinforced concrete and quality formwork techniques. Our process includes precision excavation, steel reinforcement placement, and expert concrete pouring to create a watertight and structurally sound foundation.

Safeguard your basement against water infiltration with advanced waterproofing solutions. We install exterior membranes, drainage board systems, and integrated interior drainage channels. Combined with high-performance sealants and coatings, these systems provide comprehensive protection against hydrostatic pressure.

Underpinning & Foundation Stabilisation: Address settlement and load-bearing issues with professional underpinning services. Utilising methods such as mass concrete underpinning, mini-piled underpinning, and helical piling, we stabilise and reinforce existing foundations to support additional loads and prevent further movement.

External Drainage & Soil Management Control groundwater and surface water with engineered drainage systems. Our services include perimeter French drains, perforated pipe installation, and soil grading to direct water away from the foundation, reducing hydrostatic pressure and minimising erosion.

Structural Repair & Crack Injection: Repair structural defects and seal cracks with precision techniques. We perform epoxy and polyurethane injection to fill voids and restore concrete integrity. Carbon fibre reinforcement and steel plate installation provide additional strengthening for weakened areas.

Vapour Barrier & Moisture Control: Maintain a dry basement environment with professional vapour barrier installation. Our high-density polyethene membranes and protective coatings prevent soil moisture migration and vapour transmission, preserving air quality and structural materials.

Integrated Sump & Pump Systems Enhance moisture management with integrated sump pit and pump installations. We design and install robust sump systems equipped with battery backup options and high-capacity pumps to handle peak water inflow and ensure continuous operation during power outages.