Does underpinning a Building require Building Regulation approval? Yes
Traditional Underpinning The oldest method of underpinning used, where the affected wall has sections excavated in a “hit and miss” sequence to a designed depth below the existing foundation. This is then inspected by the Building Control Body and then back filled with concrete. This method is carried out until all of the affected area has been underpinned. This method can be used in either a settlement or a heave condition.
The photo shows a site I inspected today, the excavation had been taken down to 2.3m into sandstone. Concrete will be poured into the hole up to the underside of the existing foundation.
For advice on underpinning and other structural works to buildings you should consult a Structural Engineer
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