What's the Difference Between a Site Plan and a Plat?
August 25, 2026Updated August 25, 2026
A site plan is a detailed drawing showing how a specific piece of property will be developed — building placement, parking layout, landscaping, access points, utility connections, and other design details for a proposed project. Site plans are typically required as part of the permitting process for new development and are reviewed by local planning staff to confirm compliance with zoning requirements, building codes, and site design standards before construction can proceed.
A plat, by contrast, is a legal survey document that establishes and records the boundaries and legal descriptions of individual lots, typically created during a subdivision process when a larger parcel is divided into multiple separate lots. Once approved and recorded with the county register of deeds, a plat becomes the official legal record establishing those lot boundaries, which is fundamentally different from a site plan's purpose of showing proposed development design.
The relationship between the two is sequential in many development projects: a plat establishes the legal lot boundaries first (through the subdivision process), and then a site plan is developed for the specific building or development proposed on one of those now-legally-established lots. A site plan without an underlying properly platted lot can create complications, since the site plan review process assumes a legally defined parcel to evaluate against.
For a developer or buyer trying to understand where a project stands in the approval process, distinguishing between these two document types clarifies what's actually been legally established (the plat, defining the lot itself) versus what's still in the design and approval phase (the site plan, defining what will be built on that lot). Confusing the two, or assuming a site plan approval means the underlying lot is legally finalized, is a common and avoidable misunderstanding in land development projects.
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Related questions
Does a site plan establish legal lot boundaries?
No, a site plan shows proposed development design for a specific parcel; legal lot boundaries are established through a plat, which is a separate survey and recording process.
Which comes first in a typical development project, the plat or the site plan?
Typically the plat establishes legal lot boundaries first through the subdivision process, and a site plan is then developed for the specific proposed building on one of those established lots.