A land survey measures your parcel on the ground and produces a sealed, scaled drawing that shows exactly where your property lines fall, where your buildings and fences sit relative to those lines, and what easements or rights-of-way cross the land. You need one whenever a decision depends on knowing those answers with legal certainty: buying or selling, building anything near a boundary, refinancing, subdividing, settling a dispute with a neighbor, or clearing a title insurance exception. This guide covers what a land survey does and when you need one, so you can tell whether to order a survey, which kind to order, and what to do with what it finds.
What a Survey Actually Shows
The finished product is a plat: a scaled drawing signed and sealed by a licensed professional land surveyor. The core job is pinning down boundaries, but a thorough survey captures more than lines on paper.
- Property boundaries and dimensions, with physical monuments (iron pins, concrete markers, or similar) set in the ground at the corners and tied to the legal description in your deed.
- Buildings, fences, driveways, sheds, retaining walls, and other improvements, drawn in position relative to the boundary lines.
- Recorded easements and rights-of-way: utility corridors, shared driveways, drainage paths, anything that gives another party the right to use part of your land.
- Encroachments. If a neighbor’s fence sits two feet onto your lot, or your garage overhangs the setback line, the plat shows it.
- Topographical features, where the survey type includes them: elevation contours, slopes, water, tree lines.
- The legal description that ties the parcel on the ground to the recorded deed. A legally sufficient description is one a surveyor can locate on the ground without ambiguity.1Bureau of Land Management. Specifications for Descriptions of Land
Not every survey includes every item. Scope depends on the type you order and what you negotiate with the surveyor. An ALTA/NSPS land title survey, for example, uses a standardized menu of optional add-ons (the “Table A” items) covering things like flood zone classification and parking space counts.
The Main Types of Land Survey
Ordering the wrong type wastes money and leaves gaps in the information you actually need. Four types cover almost every situation a property owner encounters.
Boundary Survey
The common choice for residential property. The surveyor locates your corners, establishes the lines between them, physically marks the corners with pins or monuments, and shows where existing structures sit relative to those lines. This is the survey to order before building a fence, adding a structure, or resolving a line dispute with a neighbor.
ALTA/NSPS Land Title Survey
The standard for commercial real estate transactions. Jointly developed by the American Land Title Association and the National Society of Professional Surveyors, these surveys follow strict uniform requirements that were most recently updated effective February 23, 2026. An ALTA survey goes well beyond boundary lines, mapping improvements, easements, rights-of-way, and evidence of use or occupation along the entire perimeter. The 2026 version also permits modern tools like drones and LiDAR instead of requiring strictly on-the-ground methods.2National Society of Professional Surveyors. 2026 ALTA/NSPS Standards The primary audience is title insurers and commercial lenders, who use the survey to remove the standard “survey exception” from a title policy.
Topographic Survey
A topographic survey maps elevation changes, contours, drainage patterns, tree lines, and existing grades. Engineers and architects need this data before designing buildings, grading plans, or drainage systems. On sloped or uneven land, a topographic survey is often the first step in site planning.
Subdivision Plat Survey
When you want to divide a larger parcel into smaller lots, a subdivision plat survey creates the legal framework. The surveyor designs lot boundaries, dimensions, and access points, then prepares a plat that goes through local planning board review, often with public hearings and requirements for roads, utilities, and stormwater. Once approved and recorded, each new lot becomes a separate legal property. The government review stretches the timeline well past other survey types.
Mortgage Location Survey
A lighter version of a boundary survey, sometimes called a house location survey. It shows property lines based on the recorded legal description and locates improvements on the lot, but the surveyor doesn’t necessarily set corner markers or resolve boundary questions with the same rigor. Lenders sometimes accept this cheaper option to verify that structures sit within property lines. It is not the right choice if you plan to build, install a fence, or resolve a dispute.
When You Need One
Most people meet a land survey for the first time when buying property or planning construction. The real list is broader.
Buying or Selling Real Estate
A survey during a purchase protects you from inheriting boundary problems, unknown easements, or encroachments that could limit how you use the property. Sellers sometimes provide an existing survey, but if it is several years old or predates recent improvements, a new one gives you a cleaner picture. Lenders often require surveys as a condition of financing, and title insurers use them to decide what exceptions appear in your policy.
Building, Renovating, or Fencing
Before adding a structure, paving a driveway, or installing a fence, you need to know where your lines fall relative to local setback requirements. Setbacks dictate how close you can build to the boundary, and violating them can result in forced removal of the improvement. A boundary survey beforehand is far cheaper than tearing down a garage that sits two feet over the line.
Resolving a Boundary Dispute
When you and a neighbor disagree about where the line falls, a survey by a licensed professional provides an impartial, legally recognized determination. Courts give significant weight to professional surveys in boundary litigation. Getting a survey early often resolves things before attorneys get involved.
Refinancing
Lenders may require a survey when refinancing, particularly if the existing title policy carries a survey exception. Fannie Mae’s selling guide, which sets standards most residential lenders follow, addresses the exception by requiring either a survey or an ALTA 9 endorsement, depending on local custom.3Fannie Mae. Title Exceptions and Impediments Whether your lender actually asks for one depends on jurisdiction and the specific transaction.
Subdividing Land
Splitting a parcel into separate lots requires a subdivision plat survey, government approval, and recording of the new plat. Without it, you cannot legally convey individual lots to buyers.
Title Insurance and the Survey Exception
This is where surveys deliver value most homebuyers never think about. A standard title insurance policy includes a “survey exception,” meaning the insurer will not cover problems an accurate survey would have revealed: encroachments, boundary overlaps, unrecorded rights arising from use or occupation.4National Society of Professional Surveyors. Minimum Standard Detail Requirements for ALTA/NSPS Land Title Surveys That carve-out leaves you exposed to exactly the kind of costly surprises title insurance is supposed to protect against.
A qualifying survey often lets you have that exception removed from your owner’s policy. The title company reviews the survey, lists any specific issues it reveals as named exceptions, and insures over the general one. The result is broader coverage. For commercial transactions, an ALTA/NSPS land title survey is typically the only form the title company will accept for this purpose. If your title company offers to remove the exception for a fee and a survey, it is usually worth doing. The cost of the survey pales against the cost of discovering an encroachment or easement after closing with no coverage for it.
Flood Zones and Elevation Certificates
If your property sits in or near a FEMA-designated flood zone, a surveyor also plays a role in your flood insurance. FEMA’s Elevation Certificate documents the elevation of your building’s lowest floor relative to the Base Flood Elevation for your area. Communities participating in the National Flood Insurance Program must obtain these measurements for new and substantially improved buildings.5FEMA. Elevation Certificate Form and Instructions
A licensed surveyor takes precise measurements at points including the lowest floor, attached garage slab, lowest adjacent grade, and the elevation of mechanical equipment serving the building. The surveyor then seals and signs the certificate as a legal assertion that the data meets FEMA standards.5FEMA. Elevation Certificate Form and Instructions The certificate directly affects your flood insurance premium. If the data shows your structure sits above the Base Flood Elevation, it can also support a request to FEMA to reclassify your property out of a high-risk flood zone. When ordering an ALTA/NSPS survey, flood zone classification is available as an optional Table A item, so requesting it during the survey saves the cost of a separate engagement later.
If the Survey Reveals Problems
Surveys sometimes surface issues nobody anticipated, and encroachments are the most common. The neighbor’s shed sits partly on your lot. Your fence runs three feet past the boundary. A driveway crosses a corner it shouldn’t.
Start by talking to the neighbor. Most encroachments are not deliberate, and many can be resolved informally. If both parties agree to leave the encroachment in place, putting the arrangement in writing as a revocable license or easement protects everyone. Without that written agreement, the neighbor could eventually claim a legal right to the encroached area through prescriptive use or adverse possession.
If the neighbor cannot or will not remove the encroachment but is otherwise cooperative, you might sell or convey the encroached strip to them. That requires a new deed and typically a new survey to establish the adjusted boundary. Check with your mortgage lender first, since the change affects the legal description of your property.
When negotiation fails, court is the remaining option. You would typically pursue a quiet title action to confirm your ownership and an ejectment action to compel removal of the encroaching structure. Both are expensive and slow, which is exactly why getting a survey before buying property matters. Finding an encroachment before closing gives you leverage to negotiate a price reduction, require the seller to resolve it, or walk away.
Cost and Timeline
A standard residential boundary survey on a typical lot generally runs between $800 and $5,500, depending on property size, terrain, vegetation density, and the availability of prior survey records. ALTA/NSPS surveys cost more because of the additional research and detail, with commercial properties commonly running from $2,500 to $10,000 or higher.
Several factors push the price up. Large or irregularly shaped parcels take more field time. Dense tree cover, steep terrain, or limited access makes work harder. Unclear or missing records mean more research hours and sometimes consultation with neighboring surveys. Rush service, when available, typically adds 50 to 100 percent to the base price. Recording fees for filing a new plat with the county are minor, usually under $60.
Total turnaround for a standard residential boundary survey runs roughly one to two weeks: research and records pull first, then fieldwork, then drafting and sealing in the office. ALTA surveys take longer because of the additional research and detail. Subdivision plats can stretch to several months once government review is included. Spring and early summer are peak season in much of the country, and turnaround times during those months can double. Most firms offer rush service at a premium if you are working against a closing deadline.
Get quotes from at least two or three licensed surveyors, and confirm each one is licensed in the state where the property sits. The lowest bid is not always the best value if it comes from a firm unfamiliar with your area’s records.
How Long a Survey Stays Good
A land survey does not technically expire. The measurements and boundary determinations remain accurate unless something changes on the ground. But something changes more often than people expect. New construction, grading, natural events, or changes to neighboring properties can all make an older survey unreliable for current purposes.
Title insurance companies often require surveys to be relatively recent. For removing the standard survey exception from an owner’s policy, many insurers want a survey no more than six months old, sometimes paired with an affidavit from the current owner confirming nothing has changed since the survey date.
As a practical rule, if your survey is more than five years old and you are entering a transaction or planning construction, get a new one or at least have a surveyor review the existing survey against current conditions. Updating an existing survey usually costs less than starting from scratch, because the surveyor can build on prior research and field data.