Boundary survey
A boundary survey is a land surveyor's establishment or reestablishment of a parcel's boundary lines on the ground. In Virginia it follows minimum standards set by regulation, records each monument found and set, and ends in a plat bearing the surveyor's seal, signature and date.
The outline on the county map and the line a surveyor has marked on the ground
Open a county parcel viewer and every tract has a crisp outline. Two of the counties here say plainly what that outline is not. Carroll County's Web GIS labels its map layers general reference only and points real estate research to recorded plats and deeds for legal acreage and ownership. Grayson County's WebGIS says its property lines began as hand-drawn maps and are not certified as survey accurate.
A boundary survey produces the other kind of line: one a surveyor has established on the ground, measured and marked. Establishing or reestablishing land boundaries is part of the practice of land surveying as Virginia's Code defines it, alongside determining topography and the location of physical improvements. Unless a statutory exemption applies, a person must hold a valid license before engaging in that practice.
Deed descriptions first, then permanent monuments on the ground
Virginia's minimum standards for land boundary surveys are in 18VAC10-20-370, most recently amended effective May 1, 2026. Two of its requirements frame the work before any plat is drawn.
First, the surveyor searches the land records for the description of the tract and of the adjoining land along the common boundaries; researching title or encumbrances is outside what the regulation intends to require. Second, corners and changes of direction are marked with monuments of permanent material, with meanders excepted and reference monuments standing in where a corner cannot physically be set.
The field measurements, the monument rules in full and the rest of the sequence are walked through in how a land survey works.
A sealed plat that says what it is and what it rests on
The work ends on paper, and the regulation lists what that paper must carry.
- Ownership
- The owner of record with recording references, and the adjoining owners
- Lines
- Bearings to the nearest second of arc and distances to the nearest hundredth of a foot
- Area
- For property in rural areas, to the nearest hundredth of an acre
- Parcel number
- The tax map designation or geographic parcel identification number, if available
- Monuments
- A description of each monument found and each monument set
- Basis
- Whether it rests on a current field survey or on a compilation from deeds, plats or surveys by others
The last line on that list separates a boundary survey from paperwork that resembles one. A plat compiled from deeds, plats or someone else's survey may not be titled a land boundary survey. The surveyor's seal, signature and date are evidence that the survey is correct to the best of the surveyor's knowledge, information and belief and complies with the minimum standards.
A house location survey is a third product again, governed by its own standard for parcels or lots under two acres. The plat's date also matters later, when someone asks whether it still serves a sale; that is the lender's, title insurer's or buyer's call, taken up in how old a survey can be and still be used.
Problems a finished survey can bring to light, and where each one goes
A survey ordered to settle one question can turn up another.
- Corners nobody can find. Looking for existing markers on the ground is its own subject, covered in how to find your property corners.
- A fence, shed or wall across the line. An improvement that extends onto adjoining land is an encroachment.
- A surveyed line that does not match the deed's description. That situation is set out in when the survey and the deed disagree.
- Neighbors who read the line differently. Adjacent owners may resolve a bona fide dispute with a boundary line agreement, inside limits Va. Code 15.2-2201 sets.
When neighbors cannot agree, a court is another path. Someone who holds a subsisting interest in the land and a right to possess it may file a motion for judgment, and the court ascertains and designates the true line as to one or more adjoining owners.
Wondering whether a tract needs a boundary survey before it lists?
Send the address or tax map number and any plat you already have, and Lowell will talk through how the lines on record bear on the sale and when the question belongs with a surveyor. No cost, no obligation.
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Questions about this term
Can a boundary survey leave a corner without a monument?
Yes, in two situations the regulation names. Meanders, such as streams, tidelands, lakes, swamps and prescriptive rights-of-way, are excepted from the rule that corners and changes of direction are monumented. And where setting an actual corner is not physically feasible, the surveyor sets reference monuments, preferably on the boundary line, and shows each one's location on the plat.
If only a piece of a tract is surveyed, are the rest of its lines affected?
They can be. Under Virginia's minimum standards, when a survey covers only a division of a tract, any existing property line that a new corner touches must be established through its entire length. What a given division needs is the surveyor's call.
Where this page's facts come from
Every rule, office and figure above traces to one of these. Rules change; check the office before you act on one.
- 18VAC10-20-370: minimum standards and procedures for land boundary surveying practice Virginia Administrative Code
- 18VAC10-20-380: minimum standards for surveys determining the location of physical improvements Virginia Administrative Code
- Va. Code 54.1-400: definitions, including the practice of land surveying Code of Virginia
- Va. Code 54.1-406: license required Code of Virginia
- Va. Code 8.01-179: establishing boundary lines by motion for judgment Code of Virginia
- Va. Code 15.2-2201: definitions, including the boundary line agreement proviso Code of Virginia
- Carroll County Web GIS, public access terms Carroll County, Virginia
- Grayson County WebGIS Grayson County, Virginia