A survey on a house is a licensed land surveyor’s measured drawing and written report showing exactly where a property’s boundaries sit, what structures stand on it, and what legal restrictions apply to the land. It combines on-site measurements with deed records, recorded plats, and physical markers to produce a scaled map and a legal description you can rely on when buying, building, refinancing, or arguing with a neighbor about a fence. If the deed tells you what you supposedly own on paper, the survey tells you what you own on the ground.
What a House Survey Shows
The core of the document is the boundary. The surveyor establishes the perimeter using deed descriptions, recorded plats, and physical evidence, often iron pins driven into the ground at the corners. Those lines decide what belongs to you and what doesn’t.
Inside and around that perimeter, the survey locates improvements: the house, detached garages, sheds, driveways, fences, retaining walls, and similar structures. Their positions matter because of setback requirements, the minimum distances local zoning requires between a structure and the property line. A shed sitting two feet from the boundary in a jurisdiction that requires five feet shows up as a visible problem on the drawing.
The survey also flags easements and encroachments. An easement is a legal right someone else holds to use part of your land, such as a utility company’s access to underground pipes or a neighbor’s right to cross your lot to reach a road. An encroachment is a structure that crosses a boundary, like a neighbor’s garage extending onto your side. Both affect what you can build and what headaches you may inherit.
Rounding out the document are the property’s legal description, elevation changes, trees, streams, and flood-prone areas. When all of this appears on a single scaled drawing, you can see relationships that no deed or tax record would reveal on its own.
Types of House Surveys
Not every survey answers the same question. The one you need depends on whether you’re buying, building, insuring, or resolving a dispute.
Boundary Survey
This is the most common residential survey. The surveyor establishes the property’s perimeter using deed descriptions, recorded plats, and physical evidence on the ground, places or locates markers at the corners, and produces a drawing showing the boundary lines relative to adjacent properties. If you’re buying a home and want to confirm where the property actually ends, this is usually the right survey.
ALTA/NSPS Land Title Survey
The ALTA/NSPS Land Title Survey is the most comprehensive standard, used primarily in commercial transactions and complex residential deals. Jointly developed by the American Land Title Association and the National Society of Professional Surveyors, these surveys exist to give title insurance companies the information they need to insure a property without making broad exceptions for survey-related issues.1National Society of Professional Surveyors. 2021 ALTA/NSPS Land Title Surveys Handout The surveyor must be given title evidence, locate all improvements and easements on the ground, and certify the results according to published standards.
These surveys include a negotiable set of optional items known as Table A. Clients can request specifics like flood zone classification, building dimensions, parking space counts, contour mapping, and evidence of underground utilities, among others.2National Society of Professional Surveyors. 2026 ALTA/NSPS Minimum Standard Detail Requirements Each added item increases scope and cost. ALTA/NSPS surveys typically run several times the price of a basic boundary survey.
Topographic Survey
A topographic survey maps elevation changes, slopes, drainage paths, and natural features across a site. Engineers and architects use the data before construction to decide where to place foundations, how to grade the land, and where water will flow. Even ground that looks flat usually has subtle slopes that affect how concrete is poured or where water pools after a storm. If you’re planning new construction or a major addition, your design team will ask for this.
As-Built Survey
An as-built survey documents what was actually constructed compared to what the plans specified. Local building departments sometimes require one before issuing a final certificate of occupancy, particularly when setbacks are in question and property lines need verification. It’s also common when a homeowner applies for permits on a structure that was built without them.
When You Need a Survey on a House
Some situations make a survey essential. Others make it a smart move even when nobody is forcing you to buy one.
- Buying a home. Lenders and title companies frequently require a survey before closing, though requirements vary by state and loan type. Even when it isn’t required, skipping it means trusting that the deed matches reality without anyone verifying it.
- Building or renovating. Adding a fence, pool, garage, or room addition without a survey is how encroachments and setback violations happen. Your local building department may demand a survey before issuing a permit, and the survey protects you from building something that has to be torn down later.
- Resolving a boundary dispute. When neighbors disagree about where one property ends and the next begins, the survey is what settles it. It provides legally defensible documentation that can serve as evidence in mediation or court.
- Refinancing. Some lenders request an updated survey when refinancing a mortgage, particularly if the existing survey is old or significant improvements have been added since.
- Subdividing land. Dividing a parcel into smaller lots requires a survey to define the new boundaries. Most jurisdictions require the subdivision plat to be recorded in the county records before the new lots can be sold separately.
- Flood insurance and FEMA maps. If your property sits in or near a flood zone, you may need an Elevation Certificate prepared by a licensed surveyor. FEMA uses the elevation data to calculate flood insurance premiums, and an accurate certificate can lower your annual premium. If you believe your property was wrongly mapped into a flood zone, a surveyor’s elevation data is required to support a Letter of Map Amendment request to FEMA.3Federal Emergency Management Agency. Understanding Elevation Certificates
How a Survey Interacts With Title Insurance
This is the part most buyers don’t realize until a problem surfaces. Most standard title insurance policies include a “survey exception,” meaning the insurer won’t cover losses related to boundary disputes, encroachments, or other issues that a survey would have revealed. Without a survey, your policy may not protect you against exactly the kind of problems that most often blindside homeowners.
When you give the title company a current survey and the insurer sees no issues, it can remove the survey exception from your policy. That removal meaningfully widens your coverage, protecting you against losses from boundary disputes and encroachments that weren’t visible in public records. Some title companies also offer a survey endorsement that specifically covers boundary and encroachment issues once the survey confirms no problems.
If the survey does find something, you aren’t necessarily stuck. You can ask the title company for affirmative coverage against losses tied to the known issue. For example, if a neighbor’s shed slightly crosses the boundary, the insurer may agree to cover losses if someone later forces its removal. That kind of targeted coverage only becomes possible once there’s a survey identifying what needs to be covered.
What to Do If the Survey Finds a Problem
Surveys sometimes uncover issues that need to be dealt with before you can comfortably move forward. Knowing the options keeps a survey problem from killing the deal or the project.
If the survey reveals an encroachment, the first step is usually a conversation with the neighbor. Many encroachments happen innocently, like a fence installed years ago on a wrong assumption about where the line falls. Sometimes the neighbor agrees to move the structure. If both sides prefer to leave it, you can grant a written easement or license that formalizes the arrangement and prevents the neighbor from later claiming ownership of that strip through adverse possession.
Another option is to sell the encroached portion to the neighbor, which cleanly resolves the boundary. That typically requires a new deed and an updated survey showing the adjusted line. Contact your mortgage lender before agreeing to any sale of land, since it changes the collateral securing your loan.
If negotiations fail, court remedies exist. A quiet title action establishes ownership, and an ejectment action can force removal of an encroaching structure. Both are expensive and slow, which is why most encroachments get resolved through negotiation or easement agreements instead.
For problems discovered during a home purchase, you generally have more leverage. You can negotiate a price reduction, require the seller to resolve the issue before closing, or ask the title company for affirmative coverage on the specific problem. If the issue is severe, such as a major structure sitting partially on a neighbor’s land, walking away may be the smartest call.
Who Performs House Surveys
Only a licensed professional surveyor can legally perform a property survey in the state where the property is located. Licensing requirements vary, but most states now require at least a four-year degree in surveying or a related field, followed by a roughly four-year supervised internship. Candidates must pass both a fundamentals exam and a state-specific principles and practice exam before receiving their license.4National Society of Professional Surveyors. Surveyors Professional Qualifications
A surveyor licensed in one state cannot simply practice in another. Each state requires its own license, and surveyors crossing state lines typically need to pass the new state’s exam. If you’re looking at property near a state border, make sure your surveyor is licensed in the state where the land sits, not just the state where the office is.
How to Order a Survey and What It Costs
Start by finding a licensed surveyor in the state where the property is located. Your state’s professional surveyor association, your real estate agent, or your title company can refer one. Verify that the surveyor’s license is current and in good standing with the state licensing board.
When you request a quote, provide the property address, a copy of the deed or legal description, and the reason for the survey. The type of survey, the size and complexity of the property, local terrain, and whether the land has been previously surveyed all affect price. A straightforward boundary survey on a standard residential lot generally runs a few hundred to a few thousand dollars, while an ALTA/NSPS survey with multiple Table A items can run significantly higher. Heavily wooded lots, irregular shapes, and properties with unclear historical records push costs toward the upper end.
Turnaround varies widely depending on the surveyor’s workload, the complexity of the job, and how quickly the surveyor can pull existing records. In busy real estate markets, waits of several weeks are common, so build survey time into your transaction timeline early. Pushing it to the last minute before a closing creates unnecessary stress and limits your options if the survey turns up something.
How Long a Survey Stays Valid
A completed survey doesn’t technically expire, but its usefulness fades over time. If new structures have been built, fences moved, or easements recorded since the survey date, the document no longer reflects what’s actually on the ground. Title companies and lenders may require a new or updated survey if the existing one is more than a few years old or if significant changes have occurred. When in doubt, ask your lender or title company whether they’ll accept the survey you already have before paying for a new one.
Reading the Final Plat
When the surveyor finishes, you’ll receive a plat or map along with a written report. Read it carefully, especially the notes. Surveyors often include observations that don’t appear on the drawing itself, such as use patterns suggesting an unrecorded easement, or markers that don’t match the deed description. If anything is unclear, ask the surveyor to walk you through it. This is the point where problems are cheapest to address, and the document is only useful if you actually understand what it says.