Not all land surveys are the same. There are different types of land surveys, and each one is used for a different reason. Picking the wrong type can slow down a home purchase, delay a building permit, or leave important questions about your property unanswered. Knowing which survey fits your situation will save you time and money.
The United States conducts over 1.5 million land surveys every year. More than 45% of those are connected to home building and property development. That is a lot of people who need to understand their options before they hire a surveyor.
The Main Types of Land Surveys
Boundary Survey
A boundary survey finds the exact legal edges of a piece of land. The surveyor reviews the property deed, checks nearby deeds, and then visits the property to locate physical markers. These markers are usually iron pipes or metal rods that have been placed in the ground to mark the corners of the property.
The result is a legal map that shows exactly where your property starts and ends. People use this survey when they want to build a fence, add a structure, or confirm that a neighbor is not crossing onto their land.
Boundary surveying in Washington DC is different from most other places. There is no standard coordinate system used in DC. Surveyors must work with two sets of official survey books that sometimes show different measurements. In older parts of the city, existing buildings are used as reference points for property lines. Only 29 registered surveyors in the entire District are allowed to perform official boundary surveys.
ALTA/NSPS Survey
An ALTA/NSPS survey is the most detailed type of land survey available. It follows a national set of standards created by the American Land Title Association and the National Society of Professional Surveyors, last updated in 2021. These standards are the same in all 50 states.
This is why banks, title companies, and attorneys require this survey for most commercial real estate deals. An ALTA survey covers property boundaries, easements, encroachments, utilities, and anything else that could affect a property title. It gives every person involved in a commercial transaction a full and reliable picture of the land.
Topographic Survey
A topographic survey focuses on the shape and height of the land rather than its legal boundaries. It records slopes, drainage patterns, trees, roads, and any buildings on the property. Architects and engineers need this information before they can design a building or plan how a site will be developed.
In Washington DC, a topographic survey is required before any civil engineering site plan can be submitted for approval. Without it, a design team is working without a complete picture of the land.
Construction Survey
A construction survey is used during a building project to make sure everything is placed in the right spot. Before work begins, the surveyor marks the exact positions of walls, footings, roads, and utility lines based on the approved plans. The surveyor returns during construction to confirm that the work matches those plans.
At the end of a project, a final review called an as-built survey checks that all completed work was built in the correct location. This step is often required before a building permit can be closed.
Mortgage Survey
A mortgage survey, sometimes called a location survey, is a simpler type of survey that lenders and title companies ask for during a home purchase closing. It shows where the house sits on the lot and whether it falls within the property lines.
This survey is not as detailed as a boundary survey. It does not carry the same legal weight, but it satisfies what most lenders need before they approve a home loan. If you are buying a house and your lender asks for a survey at closing, this is usually the type they are referring to.
Subdivision Survey
A subdivision survey is done when a landowner wants to split one piece of land into two or more separate lots. The surveyor creates an official map called a plat. This map shows the new lot lines, measurements, and any shared access points or easements.
The plat has to be reviewed and approved by local planning offices before it is recorded in the public land records. Once that happens, each new lot has its own legal description and can be sold or built on separately. This type of survey is common among developers, heirs dividing inherited land, and landowners who want to sell portions of their property.
Drone and Aerial Survey
A drone survey uses unmanned aircraft equipped with cameras and LiDAR sensors to collect detailed information from above the ground. The data is processed into high-resolution maps, 3D models, and elevation measurements that would take much longer to gather on foot.
Modern drone surveys can be accurate to within 1 to 3 centimeters horizontally when used with ground control points. This makes them useful for mapping large properties, tracking construction progress, and building detailed terrain models for engineering work. Drone surveys support traditional surveying methods but do not replace them. Legal boundary work still requires a licensed surveyor working on the ground.
Which Survey Do You Need?
The right survey depends on what you are trying to do. This table makes it easy to find the right match:
| Your Situation | Survey Type |
| Buying a home | Boundary or Mortgage Survey |
| Buying commercial property | ALTA/NSPS Survey |
| Planning new construction | Topographic Survey |
| Building during a project | Construction Survey |
| Splitting land into lots | Subdivision Survey |
| Mapping a large property | Drone/Aerial Survey |
If you are still not sure which type you need, a licensed land surveyor can review your situation and help you figure it out before any work begins.
