Article · December 18, 2025 · Updated September 22, 2026
What Is a Plat (or Survey) Report?
A recorded plat is a map connected to land records, while a current boundary survey is professional work that locates property boundaries on the ground. A plat can help with early planning for a deck, porch, enclosure, fence, or addition, but an older recorded document may not show later improvements or answer every boundary question.
A Plat and a Boundary Survey Are Not the Same Thing
The Maryland State Archives describes plats as maps related to land ownership that show boundaries described in deeds. Recorded subdivision, condominium, and survey plats can provide lot dimensions, streets, easements, building restriction lines, and other recorded information.
A boundary survey is different. It is performed by a qualified surveyor to establish or reestablish a parcel's boundaries using records and field evidence. Maryland regulates this work through the Board for Professional Land Surveyors. A copy of a recorded plat can support the surveyor's research, but it is not a substitute for current field work when the actual boundary location is in question.
How to Find a Recorded Maryland Plat
Start with the deed or closing documents for the property. They may contain a plat book and page reference. The Maryland State Archives also recommends checking the state's real-property search for a plat reference associated with the parcel.
PLATS.NET provides public access to many Maryland land-survey, subdivision, condominium, and right-of-way plats. Searches are organized by county and the identifying information available in the land records.
If the record cannot be located online, the county land-records office, clerk of the Circuit Court, title company, or a licensed surveyor may be able to help identify it. A contractor should not guess a property line from a fence, hedge, tax map, or the way neighboring yards are used.
What a Plat Can Show for Project Planning
Depending on the document, a plat may show:
- Lot lines and dimensions
- Road rights-of-way and recorded easements
- Building restriction lines or setback references
- The location of a house or other improvements existing when the plat was prepared
- Subdivision, parcel, plat-book, and page information
These details help establish whether a proposed deck, porch or portico, or screened enclosure appears feasible. They do not, by themselves, approve a project.
Permit Documents Depend on the Project and Jurisdiction
Maryland counties do not use one universal submission rule. For example, Frederick County requires a site or plot plan for deck and porch applications, with the proposed work and distances to property lines shown. Montgomery County's residential deck guidance directs applicants to place the proposed deck on a house-location plat or survey and show distances to lot lines. Anne Arundel County's deck guide calls for a scaled site plan and additional documents when applicable.
Because requirements vary by address, zoning district, project type, and site conditions, homeowners should confirm the current checklist with the permitting and zoning offices that have authority over the property.
When an Updated Survey May Be Needed
Consider contacting a Maryland-licensed land surveyor when:
- No usable recorded plat or prior survey can be found.
- The available drawing does not show later additions, fences, sheds, or other relevant improvements.
- Proposed work is close to a property line, easement, or building restriction line.
- Boundary markers are missing or neighboring owners disagree about the line.
- The permit office, designer, lender, title professional, or attorney requests current survey information.
The appropriate survey product depends on the question being answered. The surveyor and local reviewing agency should define that scope; a remodeling contractor should not present a recorded plat as a new boundary determination.
Prepare the Document Before Design Begins
Keep the best available plat or survey with the property's permanent records and retain an electronic copy. For project planning, bring the complete document—not a cropped screenshot—so the title block, scale, references, easements, and notes remain visible.
Having the document available early can reveal a constraint before design work advances. It cannot guarantee permit approval, but it gives the homeowner, designer, contractor, surveyor, and permitting office a more useful starting point.