Pre-Listing Inspection on Long Island

The short answer: a pre-listing inspection is optional. On a Nassau or Suffolk house, the items that most often shape a sale are a buried or old oil tank, the cesspool or septic system, radon, termites, and the foundation. New York’s definition of a home inspection leaves out radon and pests, so those are separate tests. Checking these items before you list lets you repair them, document them or price them in on your own schedule. Review anything you learn carefully when completing your Property Condition Disclosure Statement, with your attorney.

What a New York home inspection covers, and what it doesn’t

• The legal definition: New York’s licensing law defines a home inspection as a written report on a home’s systems and components, “including but not limited to” heating, cooling, plumbing, electrical, structural components, foundation, roof, masonry, and the exterior and interior.
• What your report actually covered: the same law requires the inspector to identify in the report which systems and components were observed. Read that part, because an item that could not be seen or reached was not inspected.
• Not included: the law says a home inspection “shall not include an inspection for radon or pests.” Radon and termite or other wood-destroying insect checks are ordered separately.
• Licensed by the state: home inspectors in New York are licensed by the Department of State.
• Timing: on Long Island, buyers usually inspect before the contract is signed, so what the inspector finds tends to shape the offer and the contract.

The Long Island items a buyer’s inspector will flag

1. Buried or old heating oil tanks

Many older Long Island homes were heated with oil, and some still have a tank buried in the yard or an old one left in place. A buyer’s inspector may note signs of one, such as a fill pipe or vent pipe outside or supply lines through the foundation wall. A standard home inspection does not establish whether a buried tank exists, so some buyers also order a “tank sweep,” a scan of the yard for one.

• Why buyers care. The state Department of Environmental Conservation (DEC) notes that many buried home tanks are 275-gallon steel tanks that “were not designed to be buried” and, left in place, will eventually corrode and leak. Under New York law the owner of a tank that leaks is the “discharger” and is strictly liable for the resulting damage, and DEC warns that many homeowner policies have a “pollution exclusion.”
• What DEC says about selling. If you sell, “a bank or the buyer likely will ask for an environmental assessment or the removal of the tank.” DEC calls removal “the best choice,” because it lets you check for soil contamination and avoids a later sinkhole.
• Closing a tank. A tank taken out of service must be emptied, cleaned and purged of vapors. One left in the ground is filled with an inert material such as sand, with its vent lines left open and its fill line capped or removed.
• Nassau. The county Department of Health handles closures of small heating-oil tanks (under 1,100 gallons): you schedule the removal or abandonment through the county, and you can print a confirmation letter for a closure already done. Keep that letter: it is the kind of document a buyer’s attorney asks for.
• Suffolk. The county Department of Health Services says fuel oil tanks do not have to be removed unless they are leaking. Whether a home tank is regulated depends on its size and location, so confirm the closure requirements with the county and your attorney before you close one, and keep whatever paperwork you receive.
• Disclosure. In either county, disclose what you know about a tank accurately: whether there is one, its condition, and how and when it was closed.
• If there was a leak. Contamination must be reported to the DEC Spills Hotline at 1-800-457-7362.

How much does it cost to remove an underground oil tank on Long Island?

The only official figure we found is in DEC’s homeowner guide, which says removal “can cost from $1000 to $5,000 depending on the size of the tank, its condition, and how easily it can be reached.” The page is undated (we read it on 2026-10-23), so treat it as a general agency estimate, not a current contractor price. Soil testing, cleanup of any contamination, permits and difficult access can add substantially to the total. DEC advises getting written estimates from several contractors and a written contract before work begins.

2. Cesspools and septic systems

Suffolk County says nearly 70% of its homes use cesspools and septic systems, and Nassau County says tens of thousands of its homes do. The disclosure statement asks about the type of sewage system, its age, when it was last pumped and any known defects (what the form asks). Pumping empties a cesspool or septic tank; it is not the same as an evaluation of the system’s condition, which buyers often order separately from the home inspection.

• Suffolk: replacing a failed cesspool. Since July 1, 2019, an owner who replaces a failed cesspool can no longer install another cesspool: the replacement must be at least a code-compliant system with a septic tank, and the work needs a county permit or filing. The county says the change does not mandate an upgrade upon failure and does not require a nitrogen-reducing (I/A) system. Selling the house does not trigger this rule. Confirm what applies to your property with the county Office of Wastewater Management.
• Suffolk grants (county grant page, read 2026-10-24). For replacing a cesspool or septic system with an I/A system: the county Septic Improvement Program provides grants of up to $20,000 per property, and the New York State Septic System Replacement Program provides up to 75% of eligible costs, not to exceed $25,000 per property, each depending on whether the project qualifies. The property must be an existing one- or two-family home (or a single-family home with one accessory apartment) that is not sewered, with a valid certificate of occupancy and property taxes current. Payment is issued after installation, and only installers on the county’s approved list can install a grant-funded system.
• If you already have a grant-funded system, tell the buyer. The county says these systems need annual professional maintenance and cannot be removed without the county Department of Health Services’ written approval.
• Nassau grants (county S.E.P.T.I.C. page, read 2026-10-24). Grants of up to $20,000 to replace an existing cesspool or septic system with a nitrogen-reducing system, for eligible properties that are not connected to a sewer.

3. Radon

• What it is. The state Department of Health calls radon “the leading cause of lung cancer among nonsmokers”: a natural radioactive gas from the soil that enters through cracks in the foundation. EPA says all homes should be tested.
• Buyers test. The Department of Health recommends testing when buying a home, and recommends hiring a certified radon tester whose results come from a state-approved laboratory.
• The level that matters. The state recommends fixing a home at 4 picocuries per liter (pCi/L) or higher, and says you may want to consider it between 2 and 4.
• Testing before you list. Keep the house closed, with windows and doors shut, for 24 hours before and during the test. The Department of Health sells a home test kit for $12.25, which includes analysis and postage (its radon page, read 2026-10-23). The state also publishes radon test results by town.
• Records. If you have a radon test report or a mitigation system, keep the paperwork. The disclosure statement asks about radon reports.

4. Termites and other wood-destroying insects

A pest inspection is not part of a New York home inspection, so buyers order one separately. A buyer’s inspector may still note damaged wood or signs of past treatment. If the house was treated, keep the treatment records and any service agreement, since the disclosure statement asks about pest reports.

5. Foundation and structure

The foundation is one of the components named in the law’s definition of a home inspection. Inspectors look for cracks, water entry, settling and past repairs, and they may recommend that a structural engineer evaluate what they find.

Selling a house with foundation problems. You have three usual paths:

1. Repair it before listing, with any required permit closed out before the sale (why open permits matter).
2. Have a structural engineer evaluate it, so you and buyers start from the same facts. The report describes the condition; how it affects the price is a separate negotiation.
3. Sell as-is, which limits the repairs you agree to make but not what you must disclose (selling as-is in New York).

Whichever path you take, review what you know about the foundation carefully when completing the disclosure statement, with your attorney.

6. Flooding and other items

Flood zones, flood history and flood insurance have their own section: flooding on Long Island. A home built before 1978 also needs the federal lead-paint disclosure (what it requires).

Should you inspect before listing? The pros and cons

Reasons sellers do it

• Fewer surprises after the offer. You learn what the buyer’s inspector is likely to find while you still control the timing.
• Time to choose. You can repair, get written quotes, close out permits, or price an item in, rather than negotiating it under a deadline.
• Documents ready. A tank closure letter, cesspool pumping records or a radon test answers a buyer’s question in one page.
• An accurate listing. The price and the description start from the home’s actual condition.

Reasons sellers skip it

• You may learn something new. A pre-listing inspection may reveal conditions you were previously unaware of. Those findings should be reviewed carefully when completing or updating your Property Condition Disclosure Statement, with guidance from your transaction attorney (what the law requires of sellers).
• The buyer will usually inspect anyway. A seller’s report does not replace the buyer’s own due diligence, so most buyers hire their own inspector (what a buyer’s inspection checks).
• It costs money and time before the house is even listed.
• A report can list items a buyer would never have raised.

A targeted alternative. Sellers who do not want a comprehensive pre-listing inspection can instead investigate specific concerns, such as an old oil tank, cesspool or septic system, or radon levels.

Before you list: records to gather

• Oil tank: removal or abandonment paperwork (in Nassau, the county’s closure confirmation letter) and any soil test.
• Cesspool or septic: pumping and repair records, the county permit for any replacement, and the maintenance contract for an I/A system.
• Radon: test reports, and the installation and test records for any mitigation system.
• Termites: treatment records and any service agreement.
• Structure and repairs: engineer’s reports, permits and final sign-offs, and receipts for major work.
• Flood: insurance policy, elevation certificate and any claims history.

How these fit into the Property Condition Disclosure Statement, including what happens if a statement turns out to be wrong (liability), is covered in our disclosure guide.

Selling in Queens or Brooklyn? This page is written for Nassau and Suffolk. The home inspection law and the state’s radon guidance apply statewide, but the oil tank and cesspool rules above are Nassau and Suffolk county rules and do not apply in New York City.

Common questions

Should I get a pre-listing inspection before selling my house on Long Island?

It is optional; New York does not require one. It shows you what a buyer's inspector is likely to find while you still have time to repair, document or price it in. If you do not want a full inspection, you can investigate specific concerns instead, such as an old oil tank, the cesspool or septic system, or radon.

Does a home inspection in New York include radon and termites?

No. The state's home inspector licensing law says a home inspection "shall not include an inspection for radon or pests." Radon and termite checks are separate tests.

What happens if the buyer's inspector finds an old buried oil tank?

Expect questions about whether it leaked and how it was closed. The state Department of Environmental Conservation says a bank or buyer will likely ask for an environmental assessment or the removal of the tank. Closure paperwork answers that: in Nassau, the county Health Department issues a confirmation letter for a completed small-tank closure; in Suffolk, ask the county Department of Health Services.

How much does it cost to remove an underground oil tank on Long Island?

The only official figure we found is in the state DEC's homeowner guide, which says removal "can cost from $1000 to $5,000 depending on the size of the tank, its condition, and how easily it can be reached." The page is undated (we read it October 23, 2026), so treat it as a general agency estimate, not a current price. Soil testing, cleanup of any contamination, permits and access can add substantially to the cost.

Do I have to replace my cesspool before selling in Suffolk County?

Selling does not trigger Suffolk's cesspool rule. The rule applies when a failed cesspool is replaced: since July 1, 2019, the replacement must be at least a code-compliant system with a septic tank, and the work needs a county permit or filing. The county says the change does not mandate an upgrade upon failure and does not require a nitrogen-reducing system. Confirm what applies to your property with the county Office of Wastewater Management.

How much is the Suffolk County septic grant?

As of October 24, 2026, Suffolk's grant page lists county grants of up to $20,000 per property and state grants of up to 75% of eligible costs, not to exceed $25,000 per property, each depending on whether the project qualifies. Check the county page before relying on them.

Should I test for radon before selling?

Many buyers will, since the state Department of Health recommends testing when buying a home. Testing first tells you where you stand. The state recommends fixing a home at 4 picocuries per liter (pCi/L) or higher.

Can I sell a house with foundation problems?

Yes. The usual paths are to repair it with any permits closed out, to have a structural engineer evaluate it, or to sell as-is. An engineer's report describes the condition; how it affects the price is a separate negotiation. Whichever path you take, review what you know when completing your disclosure statement, with your attorney.

Will the buyer rely on my pre-listing inspection report?

Usually not by itself. A seller's report does not replace the buyer's own due diligence, so most buyers hire their own inspector. Your report still helps you answer questions with documents.

Sources: New York Real Property Law §444-b (home inspection licensing); NYS DEC, Underground Heating Oil Tanks: A Homeowner's Guide and Oil Cleanup Information for Homeowners; Nassau County Department of Health, Petroleum Bulk Storage and small heating-oil tank closure; Suffolk County Department of Health Services, Toxic and Hazardous Materials Storage and Office of Wastewater Management; Suffolk County, Septic Improvement Program grants; Nassau County DPW, S.E.P.T.I.C. grant program; NYS Department of Health, Radon; U.S. EPA, Radon. Checked 2026-10-23; grant amounts re-checked 2026-10-24. Grant terms and county rules change, so confirm them with the agency before you rely on them.

Joseph DeVito is a New York Licensed Associate Real Estate Broker and a New York attorney. He does not act as both broker and attorney on the same transaction: here he acts as a real estate broker only, and he is not your attorney. Real estate services provided through Keller Williams Realty Greater Nassau are not legal representation. Everything on this site is general information for educational purposes only. It is not legal advice, it creates no attorney-client relationship, and it should not be relied on as legal advice — for advice about your own situation, consult your own attorney.

This page is general information, not legal or environmental advice for your property. We do not recommend or rank inspectors, testers or contractors. What you must disclose and which county rules apply depend on your own facts, so confirm them with the attorney handling your sale and the county agency.

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