"Mike Taylor" wrote in
message ...
Your BCO was wrong
Your neighbour can only build on his side of the boundary and for
technical
purposes the boundary goes vertically down and up form the ground. The
foundations have to be on his property so does any overhang, gutters,
tiles,
window catches etc. You need to go backto your BCO and check the plans of
your neighbour's extension then talk to the BCO.


AIUI - the Party Wall Act allows part of the footings to be on the
neighbours property in order to build a wall upto the boundary

Regards Jeff