Land records · Parcel maps · October 3, 2026
How to Read a Plat Map: Lines, Lots, and Notes
How to read a plat map: find your lot, decode bearings and distances, spot easements versus property lines, and know when a survey still matters.
How to read a plat map starts with knowing what you are holding: a recorded drawing that shows how a tract was divided into lots, blocks, roads, and easements. It is a paper (or scanned) record of the surveyor’s layout—not a live GPS pin dropped in your backyard. Read the legend first, then your lot, then the notes that limit how the land can be used.
Start with the title block and legend
Find the map name, recording information, north arrow, and scale. The legend decodes line types and symbols for that sheet. Solid heavy lines usually mark lot or tract boundaries. Dashed or dotted lines often mark easements, setbacks, or centerlines—confirm on the legend before you assume a fence belongs on a dashed line.
If you reached the map through a county viewer rather than a recorded PDF, the on-screen parcel outline is still a tax/GIS layer. Compare it with the recorded plat when the fence or shed question gets serious—see survey plat vs tax map.
Find your lot, block, and neighbors
- Locate the subdivision or tract name and the sheet that covers your address.
- Find your lot number (and block, if used). Trace the entire perimeter.
- Note what touches each side: another lot, a street right-of-way, an alley, open space, or an outlot.
- Read any lot-specific callouts (building setback lines, drainage easements, private access stems).
For the assessor’s index key that sits beside the map outline in GIS, review what is an APN number. To open the right county tool, start from our county GIS map directory and how to use a county GIS viewer.
Bearings, distances, and curves
Along each boundary segment you will often see a bearing and a distance—something like a compass direction from north or south plus a length in feet. Together they describe that edge of the lot on paper. Curve data (radius, arc length, delta) appears on cul-de-sacs and curved street frontages. You do not need to re-survey the lot from your kitchen table; you do need to know that those numbers are the recorded geometry, not a tape measure from your patio.
Easements vs property lines
Property lines define the parcel edge. Easements grant someone else a limited right to use a strip or area—utilities, drainage, access—without owning the fee. Misreading a dashed easement as “not my land” (or ignoring it when planning a fence) is a classic plat-reading mistake. For related vocabulary, see easement vs right of way and site plan vs plat.
Notes, roads, and limits
Read every note on the sheet. Dedication language, restricted common areas, flood or drainage statements, and monument descriptions matter as much as the drawing. Road names and right-of-way widths tell you where public or private access is supposed to sit. If a neighbor dispute is already warm, plat reading alone will not settle who pays for a new survey—see property line dispute who pays for survey.
When you still need a survey
A recorded plat shows the design geometry. A licensed surveyor finds how that record sits on the ground today—monuments, encroachments, and conflicts with adjoining deeds. Use the plat to orient yourself and ask better questions; hire a survey when you will dig, build, or litigate near a line.
Plat map FAQ
What should I look at first on a plat map?
Start with the title block, north arrow, scale, and legend. Those tell you orientation and what solid versus dashed lines mean on that sheet before you trust any lot outline.
Are dashed lines property boundaries?
Often no. Dashed or dotted lines commonly mark easements, setbacks, or centerlines. Confirm on the legend. Solid heavy lines usually show lot or tract boundaries.
Is a county GIS parcel outline the same as the plat?
Not always. GIS tax parcels are useful for orientation, but the recorded plat (and a licensed survey on the ground) control boundary questions for building or disputes.
When do I need a surveyor after reading the plat?
When you will dig, build, fence near a line, or resolve an encroachment. The plat shows recorded geometry; a surveyor locates how that record sits on the ground today.