Property lines are very important. A survey will let you know where those lines are so you do not encroach on a neighboring property. Encroachment could cause you several different problems along with making selling difficult for the party you are encroaching on. Stay within your property lines and know where they lie and you should have no problems.
The first thing is the website, as the technology is developed so much,anything and everything is available in the site. Secondly many estate agencies are famous in the market, approach them.