In general, no one is permitted to build on your property, and you can bring a court action to stop it, though you would probably need the assistance of an attorney to draft the paperwork. On the other hand, it sounds like there is some dispute as to who owns the property in question. You should ask your neighbor for a copy of his survey, and have your surveyor review it with you to see if the surveyors agree as to where the property line is.
Answered on Jul 26th, 2012 at 5:24 PM