The excavation for each section of underpinning will normally be inspected by a design engineer and a building control surveyor before it is concreted. Depending on how much of the foundation is to be underpinned it may be possible for more than one section to be carried out simultaneously – subject to them being sufficiently remote from each other. You are therefore advised to employ experienced people for the design (for example, an experienced designer and structural engineer) and construction (for example, somebody with experience of underpinning and general building work) to carry out the project.Ī typical method is for short sections of underpinning to be carried out one at a time. If not carried out properly, this kind of work poses very real risks and could see damage to or collapse of the existing home. To avoid excessively undermining the existing foundations, causing further damage to the structure above, the excavations for the underpinning should be carried out to engineer's instructions and details. The exact method to be employed for underpinning will depend on the many circumstances of the case. ![]() An initial step, before substantial commencement of the work, will generally be for a trial hole to be dug next to the existing footings for a structural engineer or surveyor to make an assessment of the circumstances of the case. Gaining such approval will usually involve the preparation of a structural design of the underpinning, including the process to be carried out during construction. If you propose to underpin an existing foundation, approval under the building regulations will normally be required. Underpinning work requires very careful planning and execution.
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