Your lawyer's title search through Information Services Corporation will flag any registered easement, right-of-way or boundary agreement already on file, and that search is part of the $800 to $1,500 legal fee range most Saskatoon closings run. If nothing is flagged, your neighbour has no role in your closing at all.
A genuinely new issue, discovering a fence or a shed is actually over the property line, for example, is uncommon but does happen, and it is exactly the kind of thing a title search and a home inspection are meant to catch before you close rather than after.
Get your hand-reviewed valuation from Joel Dyck.