I don't get to do a lot of houses- but when I do I tell my clients to ALWAYS discuss any move to their lot-line that is visual: fences, planting, landscaping, goal-posts, etc.
People are ####### crazy- and especially so over their property and perceived property (views, etc). Even the most minor things create fire-works, like trimming dead/infected branches on a tree on your lot without asking them first, because it casts shade or creates privacy to their property.
Don't be my gb who built this amazingly cool fence/wall between him and his neighbor when he moved in- replacing a crumbling fence. This new wall was fantastic- highly designed- until you went to the neighbor's side and just saw a giant blank wall. 15 years later, they are still distant and cold to him and report anything involving his house or cars to the local officials. My gb is a complete moron.