Underpinning & Structural Strengthening in London
Reinforcing Existing Foundations for Safety and Stability
Delta Force Group Ltd specialises in underpinning and structural reinforcement for residential and commercial buildings across London. Whether you're strengthening an old property or preparing for basement construction, we deliver safe, engineered solutions that protect your structure long-term.
🔧 What Is Underpinning?
Underpinning is the process of strengthening and stabilising the existing foundations of a building. It's often required when:
-
The original foundations are failing
-
The soil beneath has shifted or weakened
-
You're extending the basement or adding floors
-
Cracks are forming in the walls due to subsidence
-
Building regulations require deeper or reinforced support
🛠 Our Underpinning Methods
We tailor each project to your building's needs, using:
-
Mass Concrete Underpinning – A traditional, proven method involving staged excavation and concrete pouring beneath footings.
-
Beam & Base Systems – Reinforced concrete beams spanning weak areas with solid pad bases for added support.
-
Mini-Piling – Ideal for restricted access or poor ground conditions, we install small-diameter piles to transfer load to deeper, stable strata.
-
Needle Beams & Temporary Props – Installed for load redistribution during excavations or basement conversions.
-
Crack Stitching & Structural Repairs – Strengthening of cracked or bowing walls using bars, resins, and ties.
🔍 Signs You May Need Underpinning
-
Large or widening cracks in walls or ceilings
-
Uneven floors or sagging areas
-
Doors or windows sticking or misaligned
-
History of ground movement or subsidence
-
Planning a basement or major structural change
✅ Why Choose Delta Force Group?
-
Over 15 years of underpinning and groundworks experience
-
Work overseen by qualified structural engineers
-
Fully insured and health & safety compliant
-
Fixed-price contracts and detailed method statements
-
Trusted across London by homeowners, architects, and developers