Underpinning work requires very careful planning and execution.TB_complete_bracket

If you propose to underpin an existing foundation,approval under the building regulations will normally be required. Gaining such approval will usually involve the preparation of a structural design of the underpinning, including the process to be carried out during construction.

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.