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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...... -
I know you said you'd looked online but the gov pages are quite useful especially the guidance booklet (link on second page here) https://www.gov.uk/party-walls-building-works
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?