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Were you the owner at the time they did their extension?
Our neighbours house is owned by a housing association who are never going to do a side return, so we couldn't 'share' the boundary wall. If you or the previous owner did agree to share the wall then a portion of the boundary wall would be in each property.
If not you may be able to use their external wall and get all the space......
Party wall question time, or at least I think it is.
My neighbours have (a few years ago) completed a side return right on the boundary of the property. If I was to carry out a side return then can I use that wall as part of mine?
I must be searching for the wrong things online as I can't see an awful lot of information on the subject, but surely this crops up a lot in terrace properties?