A basic definition of a boundary survey is a legal document, sometimes called a “drawing”, that will show existing conditions of your land. In addition to property line information, it will include all substantial, visible improvements -i.e. house, walkways, shed, etc., building setback lines per your zoning (if applicable), impervious calculations, and aboveground, visible utilities, as well as marking your corners. Surveys are based on the deed to that property.