Summary:
Someone — a lender, an attorney, a contractor, or maybe a neighbor — has told you that you need a survey. And now you’re trying to figure out what that actually means. There are more types of land surveys than most people expect, and ordering the wrong one doesn’t just waste money — in Nassau County, NY, it can stall a permit application, hold up a closing, or leave a boundary dispute unresolved.
We’ve written this guide to walk through every major survey type in plain, direct language so you can walk into that conversation knowing exactly what you need and why.
Types of Property Surveys and What Each One Actually Does
Land surveys are not interchangeable. Each type is designed for a specific purpose, and the one your lender needs for a closing is not the same one your building department needs before approving a fence permit. Understanding the differences upfront saves you from paying for a second survey later — something that happens more often than it should.
The most common types you’ll encounter in Nassau County, NY are boundary surveys, title and mortgage surveys, topographic surveys, construction surveys, ALTA/NSPS surveys, flood elevation certificates, and house location surveys. There are also a few less commonly discussed types — easement surveys and measured surveys — that come up in specific situations and are worth understanding before you need one.
What Is an Easement Survey — and When Do You Need One?
An easement is a legal right that allows someone else to use a portion of your property for a specific purpose — a utility company running lines across your backyard, a neighboring property with a shared driveway, or a municipality maintaining a drainage corridor. An easement does not transfer ownership, but it does affect what you can build, where you can build it, and what a future buyer will inherit when they purchase the property.
An easement survey identifies and maps those rights. It shows where easements exist on a parcel, what they cover, and how they interact with the property’s boundary lines. In Nassau County, NY’s dense residential neighborhoods — where lots are tight and older deed descriptions sometimes reference easements in vague or outdated language — this kind of clarity matters enormously.
The situations that commonly trigger a need for an easement survey include property sales where a title search has flagged an easement that needs to be located on the ground, fence or pool installations near a utility corridor, neighbor disputes over access rights, and development projects where an easement may restrict where a structure can legally be placed.
Many Nassau County homeowners discover easements on their property for the first time when they apply for a building permit. At that point, having a clear picture of where those easements run can make the difference between a smooth approval and a costly redesign.
If you’re buying a home and the title search has surfaced an easement, don’t assume it’s a dealbreaker — but do make sure you understand exactly where it sits on the lot before you close.
What Is a Measured Survey — and How Is It Different From Other Survey Types?
A measured survey — sometimes called an architectural survey or as-built survey — documents the existing physical conditions of a structure. Rather than focusing on property boundaries, it captures the dimensions, layout, and features of a building as it currently stands: floor plans, elevations, wall thicknesses, ceiling heights, and the relationship between the structure and the lot it sits on.
This type of survey is most commonly used when someone is planning a renovation or addition and needs accurate existing-conditions drawings before an architect or contractor can begin design work. It’s also used when a structure has been modified over time and the original blueprints no longer reflect what was actually built — a situation that comes up frequently with Nassau County, NY’s post-WWII housing stock, where decades of additions, conversions, and informal modifications have left many homes without reliable as-built documentation.
In practice, a measured survey answers the question: what is actually here, and what are its exact dimensions? For a homeowner planning a second-story addition on a 1950s Cape Cod in Levittown or a kitchen expansion on a split-level in Farmingdale, having accurate existing-conditions data is not optional — it is the foundation that every downstream design decision is built on.
Without it, architects are guessing, contractors are estimating, and permit drawings may not reflect the actual structure, which creates problems during inspections. It’s also worth distinguishing a measured survey from a construction survey, which is used during active building to confirm that new work is being placed in the correct location relative to approved plans and property lines.
Survey Terminology You'll Encounter Before, During, and After the Process
One of the most disorienting parts of dealing with a land survey for the first time is the language. Deeds, closing documents, and conversations with surveyors are full of terms that sound technical but are actually straightforward once someone explains them.
A boundary survey establishes the legal limits of a parcel based on the deed description, recorded plat maps, and physical evidence found in the field. A topographic survey maps the natural and man-made features of a site — grades, elevations, trees, structures, utilities — and is typically required before any significant construction or site development project. A title survey, sometimes called a mortgage survey or house location survey, shows the relationship between the structure and the lot lines and is commonly required by lenders and title companies at closing.
What Is a Metes and Bounds Description — and Why Does It Matter in Nassau County?
Most Nassau County, NY deeds include a metes and bounds description — a legal narrative that defines your property boundaries using a sequence of directions, distances, and reference points. It reads something like: “beginning at an iron pin on the northerly side of Elm Street, thence northerly 100 feet, thence easterly 60 feet…” and so on until the description closes back on itself.
This type of description is the legal record of where your property begins and ends. But here is the thing: a metes and bounds description is a written document, and the physical world does not always match what was written, especially on properties that have changed hands multiple times over 60 or 70 years. Fences get moved. Pins get buried or disturbed by utility work or landscaping. Neighbors build structures that creep incrementally toward a line.
In Nassau County, NY, where lots are often 60 by 100 feet or smaller, even a few inches of encroachment can create a real legal problem. When we perform a boundary survey, we research the deed description, pull historical plat maps from the Nassau County Clerk’s Office, and then go into the field to locate or re-establish the physical evidence — iron pins, concrete monuments, and other markers — that define the corners.
The result is a signed and stamped survey map that carries legal standing. An unsigned sketch, a screenshot from the Nassau County Land Records Viewer, or a measurement taken by a contractor does not. Only a licensed land surveyor can produce a legally valid boundary determination in New York State — that’s not a formality, it’s the law under New York State Education Law, Article 145.
Understanding this distinction matters because homeowners sometimes assume that because they can see the corner pins in their yard, they know where their property lines are. They may be right. But they may also be looking at pins that were placed incorrectly, moved during a utility installation, or simply misidentified. The survey is not just about finding the pins — it’s about confirming they are correct.
Flood Elevation Certificates in Nassau County: A Survey Type Most Homeowners Don't Expect to Need
A Flood Elevation Certificate is an official FEMA document — Form 086-0-33 — that records a property’s position relative to the Base Flood Elevation established by FEMA’s Flood Insurance Rate Maps. It captures the building’s lowest floor elevation, its flood zone designation, and key structural details. It must be completed and signed by a licensed land surveyor, and it is the document your insurance agent uses to calculate your flood insurance premium under the National Flood Insurance Program.
In Nassau County, NY, this is not a niche survey type. Communities along the South Shore — Long Beach, Oceanside, Freeport, Merrick, Wantagh, and Massapequa — sit in or near FEMA-designated Special Flood Hazard Areas. Homeowners in these areas are frequently required to obtain an Elevation Certificate when they purchase a property, refinance a mortgage, or apply for flood insurance.
After Superstorm Sandy in 2012, demand for elevation certificates across Nassau County surged significantly and has remained elevated as FEMA continues updating its Flood Insurance Rate Maps. What many homeowners don’t realize is that an Elevation Certificate can actually work in their favor. If your home’s lowest floor sits above the Base Flood Elevation, the certificate is the documentation that can lower your flood insurance premium — sometimes substantially.
Conversely, if you are paying flood insurance premiums based on an outdated FEMA map that has since been revised, a new elevation certificate and a Letter of Map Amendment may allow you to remove the flood insurance requirement entirely. This is a survey type where the cost of getting it done often pays for itself quickly — and where having a local surveyor who understands Nassau County, NY’s specific flood zone mapping, the nuances of the South Shore terrain, and the FEMA documentation process makes a real difference.
Which Type of Land Survey Do You Actually Need in Nassau County?
The honest answer is: it depends on what you’re trying to accomplish. Closing on a home typically requires a title or mortgage survey. Building a fence, pool, or addition usually requires a boundary survey or a site plan — and in Nassau County, NY, the specific requirement varies by village, because each of the county’s 64 incorporated villages has its own building department and its own rules.
A commercial transaction often requires a full ALTA/NSPS survey. A renovation that predates reliable blueprints may start with a measured survey. And if you’re on the South Shore, there is a reasonable chance an Elevation Certificate is somewhere in your future.
What matters most is getting the right type from the start — and working with a surveyor who knows Nassau County, NY well enough to tell you which one you need before you order the wrong one. We at Islandwide Land Surveyors have been doing exactly that across Nassau and Suffolk Counties for over 50 years.
If you are not sure where to start, reach out to us for a free, no-obligation quote — and get a straight answer before you commit to anything.
