Property Plat - You will need to check your property plat, which is typically provided at settlement when a home is purchased. A plat is a drawing prepared by a licensed land surveyor showing the actual location of a parcel of property, location, home, fence, decks and other depicted property information, specifically outlining property lines and existing structures on an individual residential lot. A plat can be retrieved from the Prince William County complex at the McCoart Administration building. Find more information on Prince William County's website.