Reading a Property Survey Before You Buy a Long Island Home

ByPawli Paola Meyer

Bought at a county tax auction in 2018 for about $22,500, a one-acre lot in Hawaiian Paradise Park, on Hawaii’s Big Island, eventually carried a three-bedroom house its owner had never ordered. Anne Reynolds, a California resident, learned of it when a broker called, and the reaction that carried the story across the country in March 2024 was a question: “Are you kidding me?”

A judge ordered the contractor to pay for the house’s removal in June 2024, and court filings reported in May 2025 showed the case settled on confidential terms. Coverage attributed to a contractor’s attorney the statement that the developers had not wanted to hire surveyors, though the reporting never established how the wrong lot ended up with a house on it.

Mistakes of that size are rare. The Long Island version is smaller and far more ordinary: a fence set a foot past the line, a garage that crosses it, a driveway edge used by two owners who never checked. The New York State Bar Association names a neighbor’s fence or driveway crossing the property line, and a garage sitting on a municipal street, among the problems an attorney can catch when reviewing a survey. A buyer who can read the document spots the same things before closing instead of after.

This guide covers a standard residential lot. Waterfront parcels bring tidal boundaries and permit questions of their own, which the guide to reading a waterfront lot survey handles separately.

A survey and a tax map do different jobs

A survey is a scaled map prepared and sealed by a licensed land surveyor. New York’s practice guidelines for land surveyors, posted by the State Education Department’s Office of the Professions, describe what a boundary survey map should carry: the surveyor’s name and license number, the record documents used to establish the lines, bearings and distances, monuments found or set, visible improvements, apparent easements, and the dates of fieldwork and drawing. Those guidelines are dated February 2000 and describe good practice rather than disciplinary rules, so they work as a benchmark, not a statute.

The county tax map is a different instrument. Suffolk County’s Real Property Tax Service Agency maintains the official tax map for property tax purposes and identifies each of its more than 585,000 parcels by District, Section, Block, and Lot number. That number has one handy use here. The state guidelines list the tax map parcel number among the references a survey map should show, so it offers a quick way to confirm the drawing describes the right parcel.

Start with the title block, the dates, and the certification

The title block sits in a corner of the sheet and holds the basics: the client’s name, the property address, the surveyor’s name and license number, the drawing scale, and the dates. Confirm that the address and tax map number match the contract before reading anything else, because a survey of the neighboring parcel looks just as convincing as the right one.

Two dates deserve attention. The state guidelines call for both the completion date of the fieldwork and the date the map was prepared, along with any revision dates and a clear statement of what changed. The fieldwork date matters most to a buyer, since a deck, shed, pool, or fence added afterward will not appear on the drawing.

The certification block names the party the survey was prepared for and the standard it follows. A December 2025 McKissock Learning article on helping clients read surveys points to the surveyor’s notes as the place where assumptions and limits are spelled out, and those notes decide whether the drawing can be relied on for anything beyond its original purpose.

Read the boundary lines against the deed

Each boundary line carries a bearing, which gives its direction, and a distance, usually in feet and hundredths of a foot. The buyer’s attorney compares those calls with the legal description in the deed. The state guidelines expect the map to show the record description calls along with any deviations from them, and McKissock notes that where record and measured distances differ, the difference is typically documented on the map rather than corrected.

A small variance is not automatically a problem. An unexplained one is a fair question for the surveyor.

Find the corner markers

Monuments are the physical markers standing at lot corners: iron pins or rods, concrete markers, and similar objects set in the ground. A survey records which were found and which were set. The state guidelines say monuments should be set so boundaries are apparent from the finished map, and that a map where none were set should say so, with sample wording such as “property corner monuments were not placed as a part of this survey.”

Iron survey pin set in a lawn with orange flagging tape

Finding that note tells a buyer something specific: this survey did not mark the corners. Existing pins may still be in the ground, and the attorney can say whether marking the corners should be requested before closing.

Check where the house, garage, and fences sit

This is the part of the drawing that earns its keep. The surveyor shows the house, garage, driveway, fences, and visible utilities in relation to the boundary lines, with distances from structures to the nearest line, and the state guidelines call for visible improvements and encroachments to be shown where they bear on title. Anything drawn across a line is an encroachment, whether a fence crossing onto a neighbor or a neighbor’s shed crossing onto the lot. Everything on the drawing also reflects conditions on the fieldwork date.

According to the State Bar, the attorney reviews these findings and the buyer then decides whether to accept title despite them and whether the lender will still provide the mortgage.

Look for easements

Surveys show apparent easements and rights of way: strips where a utility company, a neighbor, or the public holds a right to cross or use part of the land. McKissock notes they are often drawn as dashed or dotted lines with a label for their purpose, and that unrecorded or prescriptive rights may not appear at all. The recorded ones surface in the title work as well, which is why the guide to easements recorded before 1960 and the piece on what a title search does not find pair well with the survey.

Setbacks need a separate check

A standard survey does not verify zoning or setback compliance unless that work was requested and certified, according to McKissock. Suffolk County’s tax map office sends zoning and variance questions to the building and planning departments of the relevant town or village. For a buyer planning a pool, an addition, or a shed, the practical order runs like this: read the survey for the existing distances, ask the town what its rules require, then ask whether the surveyor can add a setback check.

Markings you are likely to see

Legends vary by surveyor, so the legend printed on the survey overrides any general rule. The table below lists common entries and a question worth asking about each.

Hands reviewing a rolled-out property survey with a tape measure
What appearsWhat it generally meansQuestion to ask
Dashed or dotted lineOften an easement or right of way, labeled by purposeWho holds the right, and is it recorded?
“Found” monumentAn existing corner marker the surveyor locatedIs the marker still in the ground, and does it match the drawing?
“Set” monumentA new marker placed by the surveyorWas it set at every corner?
Note that monuments were not setThis survey did not mark the cornersShould corner marking be requested before closing?
Distance from a building to a lineThe offset, in feet and hundredthsDoes the distance meet the local setback rule?
Fence or shed drawn over a lineA possible encroachmentHow far over is it, and who addresses it?
Field date well before the saleConditions as of that visit onlyWhat has been built or removed since?

Is the seller’s old survey good enough?

Sellers often hand over the survey from their own purchase. A 2015 blog post from the law firm Campolo, Middleton & McCormick says that “the survey is the blueprint of what they are purchasing,” and recommends a new one. The post adds that title companies will accept an old survey if it is guaranteed to a title company, but that a feature built since then, such as a fence, becomes an exception to the property description on the title policy.

The State Bar notes that a buyer and lender may need a survey map. Whether an existing survey will do, or whether a new or updated one is required, depends on the title company, the lender, and the contract, which makes it a question for the buyer’s attorney.

A short video overview

For a visual primer on plat and survey features, the video below gives a general overview from an Atlanta-area real estate agent’s channel. New York terminology and survey conventions can differ, so the legend on the actual survey and the buyer’s attorney remain the authority.

“How to Read a Plat or Survey,” a general overview from the North Atlanta Homes & Land channel on YouTube. Georgia-based; New York conventions may differ.

Walking the lot with the survey in hand

A walk around the property with the drawing turns it into something concrete. Locate the corner markers, measure from a house corner to the nearest marker, compare the result with the distance printed on the survey, and note anything that does not line up: a fence inside or outside the marked line, a shed near the edge, a driveway that crosses.

Tape and wheel measurements can check printed dimensions, but they cannot establish a boundary. That is the licensed surveyor’s work, and any disagreement goes to the attorney and the surveyor, not to a stake in the lawn. The tools below suit the checking part.

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When something does not match

Photographs with the survey sheet in frame make a useful record, and the findings go to the buyer’s attorney promptly, since contract deadlines keep running while a question is open. The Campolo post lists removal, relocation, or a boundary line agreement as ways an encroaching fence gets resolved. How a given discrepancy affects the purchase, the price, or the title policy is a legal question; the piece on the inspection report as a negotiating document shows how findings from a different document turn into negotiating points.

Gray-shingled Long Island colonial with a boundary flag near the fence

Common questions

Who prepares a survey in New York?

A licensed land surveyor prepares and seals it. The state’s practice guidelines are posted by the Education Department’s Office of the Professions.

Can the county tax map replace a survey?

The tax map identifies parcels for property tax purposes. A survey is a separate document that locates boundaries, structures, and easements on the ground.

Does a survey show whether a pool or addition is allowed?

Not by default. A standard survey does not verify zoning or setbacks unless that was requested, so the town or village building department sets the rules.

Does a survey show every easement?

It shows apparent easements and rights of way. Unrecorded or prescriptive rights may not appear, which is one reason the survey is read alongside the title work.

Who should review the survey before closing?

The buyer’s attorney. The State Bar describes the attorney’s review as the step where problems such as a fence or driveway crossing the line are caught.

This is for informational purposes only — consult a licensed attorney or financial advisor for your specific situation. Survey practice, title requirements, and local rules change, so confirm current requirements with the buyer’s attorney and the surveyor. Sources were checked on October 10, 2026.

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