Land records · Plats · October 2, 2026
Site Plan vs Plat: What Each Drawing Is For
Site plan vs plat confuses a lot of property research because both show land on paper. A plat usually records how lots were created. A site plan shows how a project is proposed to sit on a parcel. Different jobs, different offices, different levels of legal weight.
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What a plat is
A subdivision plat (often just called a plat) is a map prepared to create or document lots, blocks, easements, and dedications. When it is approved and recorded, it becomes part of the public land records. Later deeds may refer to lot and block on that plat instead of a long metes-and-bounds description.
Plats are about dividing or documenting land. They are not building-permit drawings for a new garage or addition. For the tax-map contrast, see our guide on survey plat vs tax map.
What a site plan is
A site plan is a project layout. It typically shows the parcel outline, proposed buildings, driveways, parking, setbacks, utilities, and grading notes needed for design review or a permit. Engineers, architects, or designers prepare them for a specific proposal. The sheet may cite a survey or plat as background, but the purpose is to explain the project, not to create new lots.
Homeowners meet site plans when they apply for a shed, pool, addition, or commercial build-out. Planners and building staff use them to check setbacks, coverage, access, and related rules.
Site plan vs plat side by side
- Purpose. Plat: create or record lots and related dedications. Site plan: show a proposed use or improvement on a parcel.
- Recording. Plats are commonly recorded in land records. Site plans live in permit or planning files and may never be a “plat book” page.
- Audience. Plat: land records, title work, future conveyances. Site plan: reviewers deciding whether a project fits the rules.
- Boundary detail. A good plat is tied to survey work that supports lot creation. A site plan may sketch boundaries from a survey, GIS, or prior drawings—quality varies.
- What it answers. Plat: which lot am I, and what was dedicated or reserved? Site plan: where does this building or driveway go relative to setbacks and site features?
Which one should you pull?
- Pull the recorded plat when you need lot and block identity, dedicated easements shown on the plat, or the map that created the subdivision.
- Pull a site plan when you are preparing or reviewing a permit packet and need the proposed layout.
- Use county GIS to find the parcel fast, then jump to the documents. Start with the Platbookmapper county directory and our walkthrough on how to use a county GIS viewer.
- Hire a licensed surveyor when corners must be marked or a dispute needs on-the-ground evidence. Drawings alone do not stake a fence line.
Common mixups
- Calling every map a plat. Assessor sketches, GIS prints, and permit site plans are not automatically recorded plats.
- Using a site plan as a deed substitute. Ownership and legal description live in deeds and recorded maps, not in a conceptual layout sheet.
- Ignoring the date. An old site plan may show a building that was never built. An old plat may predate later lot combinations or vacations.
Site plan vs plat FAQ
Is a site plan the same as a plat?
No. A plat is usually a recorded map that creates or documents lots and related dedications. A site plan shows how a specific project fits on a parcel for design, review, or permits.
Which one proves my property lines?
Neither drawing alone replaces a licensed boundary survey when corners must be marked. For lot layout in a subdivision, start with the recorded plat and related survey work, not a conceptual site plan.
Why does my permit packet ask for a site plan?
Reviewers want to see buildings, drives, setbacks, and utilities proposed on the parcel. That project layout is a site plan task even when a recorded plat already exists.
Can county GIS replace both?
County GIS is a helpful parcel research layer. It is not a recorded plat and not a permit site plan. Use it to find identifiers, then open the documents that match your question.