15 Dec 2019
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United Kingdom
I’m building a rear extension on my end of terrace bungalow, my Architect has specified a 600mm x 1000mm concrete foundation. At the adjoining boundary to next door we have a concrete post fence, the 150mm of foundation on that side of the 300mm cavity wall will need to go slightly past the centre of the existing fence.

I was thinking that I could leave the fence in place, dig right up to it and have my cavity wall sit off centre on the foundation? But I presume that a BCO would not allow this as the weight is not spanning equally along the width of the foundation.

has anyone had experience with this sort of situation? And what a BCO would allow? I have all party wall details sorted on this, just saying.

I think that it could be more suitable if I were to get the engineer to design an offset foundation for that side (at the boundary)
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