Underpinning Risk Assessment

A comprehensive risk assessment for underpinning, covering example hazards and control measures. 

Underpinning a house is a critical construction process designed to enhance or bolster the foundations of a building, particularly when they are deemed insufficient or compromised, often as a result of subsidence—a condition in which the ground beneath the structure shifts or settles unevenly. This technique involves the reinforcement, repair, or augmentation of existing foundations to ensure they possess the necessary strength and stability to adequately support the weight of the structure above.

The underpinning process is typically employed to resolve issues associated with subsidence, which may manifest as visible cracks in walls, misaligned doors and windows that stick, or a discernible tilting of the building. To effectively address these challenges, contractors often excavate pits beneath the current foundations. These pits are subsequently filled with robust materials such as reinforced concrete, epoxy resins, or specialised underpinning systems to increase the depth and structural integrity of the foundations.

Additionally, modern methods may also involve injecting resin or expanding foam into the soil surrounding the foundations. This approach consolidates the ground, minimises voids, and effectively stabilises the soil, thereby preventing further settlement or movement that could jeopardise the building’s structural integrity.

Underpinning becomes essential not only when subsidence issues are apparent but also in scenarios where concerns exist regarding the stability of existing foundations, particularly in the context of upcoming extensions or structural modifications. The reinforcement of foundations can provide a secure base for new developments, ensuring that the added weight and building stress are adequately managed.

While underpinning is an effective solution, it is essential to recognise that this process can be both costly and disruptive. It typically requires extensive excavation and may temporarily affect the property's livability. Homeowners considering this option should prepare for potential inconveniences during the construction period.

If you are selling a house that has undergone underpinning, it is crucial to disclose this information to potential buyers. Transparency regarding the underpinning process not only informs buyers about the property's structural history but also helps manage expectations about any implications it may have for future renovations or modifications.

This document is:

• Recognised by local authorities
• Recognised by principal contractors
• Suitable for CDM sites
• Approved by H&S managers

It increases your chance of winning tenders and has been written by trained health and safety professionals.

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Some sample text from this document reads:

'Falling from height (into excavation)'

• Serious or fatal injury could occur if a worker falls from a height into an excavation.

• Physical barriers are to be erected around the excavation

• Appropriate ladders, correctly secured and extended one metre above floor level, should be used to enter and exit the excavation

• Adequate shoring or battering of the sides to a suitable angle to prevent collapse

• The area around the excavation should have good housekeeping with trip hazards removed

• Vehicles to be kept away from excavations where possible.

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