Definition
A plat map (often just “platâ€) is a recorded map that shows how a larger tract of land is subdivided into lots, blocks, streets, and related features like easements and rights-of-way. Plats are filed with a local recording office and become part of the public record.
What a Plat Map Typically Shows
- Lot and block layout: numbered lots and blocks within a subdivision.
- Dimensions and bearings: boundary lengths, angles, curve data (where applicable).
- Streets and alleys: public rights-of-way and their widths.
- Easements: utility, access, drainage, shared driveways, etc.
- Setback or building lines: sometimes noted as “building setback lines.â€
- Dedications and notes: conditions, restrictions, or dedicatory language.
Plat Map vs. Survey
Investors often confuse plats with surveys. A plat is a recorded subdivision map showing intended parcel layout. A survey is a site-specific field measurement prepared by a licensed surveyor that confirms where the property lines and improvements sit in the real world.
- Plat: public record; ideal for understanding subdivision layout and legal references.
- Survey: confirms boundary locations, monuments, encroachments, and improvement placement.
Why It Matters
Plat maps are foundational for boundary clarity, access, and use constraints. They help investors quickly see whether a property is part of a platted subdivision, what easements affect it, and how it connects to streets and utilities.
Investor Uses
- Confirming legal identity: match the deed’s “lot & block†description to recorded plats.
- Spotting easement risk: identify utility or access easements that restrict building or parking.
- Evaluating access/frontage: understand rights-of-way and whether access is public or private.
- Feasibility screening: assess whether lot shape/size supports additions, ADUs, or redevelopment.
- Title review: reconcile plat notes with title exceptions and recorded documents.
Example
A buyer plans to expand parking behind a retail building. The recorded plat shows a 10-foot utility easement along the rear lot line and a drainage easement cutting through the corner. Even if the area looks “unused,†these easements may prevent paving, adding lighting, or building structures without utility approval.
Common Pitfalls
- Assuming the plat is current: later replats or vacations may change lots, streets, or easements.
- Ignoring plat notes: restrictions and dedications can be buried in small print.
- Confusing ROW with lot lines: the edge of pavement is not the property boundary.
- Relying on a plat instead of a survey: plats don’t show where buildings/fences actually sit today.
- Missing non-platted parcels: some properties are metes-and-bounds and won’t have a subdivision plat.
Where to Find Plat Maps
- County recorder / auditor: recorded plat books or digital records.
- Assessor / GIS portals: often provide plat references and parcel overlays.
- Title company: commonly supplies plats and recorded map references in the title package.