A Improvement Survey Plat is basically a Monumented Land or Boundary Survey Plat with additional information. It shows the locations of all structures and improvements located on the subject property, easements, visible encroachments, visible utilities and underground utilities for which there is visible surface evidence on the subject property, and any fences, hedges, or walls on or within five feet of all boundaries of the subject parcel. (typical for Residential Property and Building Permits)