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We wish to build an extension but we have 2 cypress trees 5-8m from the closest part of the extension on weald clay. We will need 2.5m foundations or piling if the trees stay but our neighbour has offered to remove them to help out. The building control officer has seen the trees and knows they...

We are on heavy clay and we have a leylandii at 5m away from a proposed single story extension-can anyone tell me how deep we have to dig the foundations according to the NHBC tables please?