Plat Map
A plat map is an official, recorded drawing that shows how a piece of land has been divided into individual lots — it’s basically the blueprint for your neighborhood showing every lot, street, and easement.
When a developer subdivides raw land into a neighborhood, they create a plat map and record it with the county. It shows lot boundaries, lot numbers, street layouts, utility easements, setback lines, and common areas. Your property’s legal description often references the plat map directly — something like “Lot 14, Block 3, Sunny Acres Subdivision.”
Why You Should Care
A plat map tells you things the MLS listing won’t. That “large corner lot” might have a 30-foot utility easement cutting through the backyard. The “private cul-de-sac” might actually be a public right-of-way. Plat maps reveal the true constraints on a property — and they’re public records anyone can access.
Developers sometimes include restrictive covenants right on the plat map, like minimum home sizes (no houses under 2,000 sq ft) or architectural requirements. These restrictions run with the land just like CC&Rs.
Watch out: Plat maps can be decades old and may not reflect current conditions. A fence might be in the wrong place. A neighbor’s addition might cross the lot line. Always compare the plat map with a fresh property survey before buying. The plat shows where boundaries SHOULD be. The survey shows where they ACTUALLY are. Discrepancies between the two are where lawsuits start.
For new construction, the plat map is essential. Builders must submit subdivision plats for government approval before selling any lots. The plat shows proposed streets, lot sizes, drainage areas, utility easements, and open spaces. Changes after recording require a replat, which goes through the same approval process. If you’re buying in a new development, ask for the recorded plat and compare it to the marketing materials — developers sometimes show optimistic layouts that differ from the approved plat.
You can get a copy of any plat map from your county recorder’s office or assessor’s website — most are available online for free. If you’re having trouble reading one, a licensed surveyor can interpret it for you. Plat maps are also useful for checking property tax boundaries. See the glossary for related terms like survey, legal description, and easement.
What’s the difference between a plat map and a survey?
A plat map shows the original subdivision layout — lot lines, streets, and easements as planned by the developer. A survey is a current measurement of a specific property’s actual boundaries. Plat maps are general; surveys are specific. A survey will catch if someone built a fence 2 feet over the property line. A plat map will show you where the line was supposed to be.