Selling an older house on Long Island
Selling an older house on Long Island
What a buyer's inspector finds in a house of this age, what the county and the state actually require, and what you can price for instead of fixing.
Sources checked 29 September 2026
The houses out here are old. The homes in Linda LaFleur's own closed sales have a median build year of 1960, and the oldest was built in 1926. A house of that age sells on its condition more than on its kitchen, and most of what goes wrong between an accepted offer and a closing is the building itself.
This page answers the questions that come up on those houses, in the order they usually come up. Each answer says where it comes from: the state statute, the town building department, or the Suffolk County programme that pays for part of it. Where something depends on your town or your lender, it says that rather than guessing for you.
None of this is legal advice, and none of it replaces an attorney or an inspection. It is what a seller of a 1950s or 1960s house here has to deal with, written down.
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01
What the buyer's inspector will actually look at
New York licenses home inspectors, and the state defines a home inspection as the process by which an inspector observes and provides a written report of the systems and components of a residential building. In practice that means the heating, cooling, plumbing and electrical systems, the foundation, the roof, the masonry structure and the exterior and interior components.
An inspector reports what is there on the day. They do not predict how long a roof has left or guarantee a boiler through the winter. That distinction matters to a seller, because the report that comes back is a list of observations, and the negotiation that follows is about which of them are worth money.
The items that stop deals here are rarely cosmetic. They are the ones with a rule or a lender behind them: a structure with no certificate of occupancy, a tank in the ground, a cesspool, or an electrical service nobody will insure.
Source: New York Department of State, home inspector licensing
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02
The certificate of occupancy, and the work nobody pulled a permit for
A certificate of occupancy is issued by your town, not by the county or the state, and it covers the structure as it was approved. A dormer, a deck, a finished basement or a garage conversion done without a permit is not on it. That is the single most common open item on an older house here.
It is not automatically a disaster. Towns have a route for it. The Town of Brookhaven, which covers Holtsville, Lake Grove and part of Ronkonkoma, issues a Certificate of Existing Use for structures that predate the record, and the Building Division will tell you which of the two you need before you list. Islip and Smithtown run their own versions.
Two reasons to start this early rather than at contract. The work takes as long as the town takes, which is not something your closing date can compress. And a valid certificate of occupancy is one of the eligibility conditions for the Suffolk County septic grant in the next section but one, so an open permit can quietly cost you twenty thousand dollars of somebody else's money.
Sources: Town of Brookhaven Building Division, Suffolk County septic grant eligibility
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03
The oil tank in the yard
Most residential heating oil tanks under 1,100 gallons sit outside New York State's petroleum bulk storage rules. Suffolk is not most places: the state's own guidance tells homeowners in Nassau, Suffolk and Westchester to contact their county health department, because these delegated counties have regulations that do apply.
Your options are removal, testing, or abandonment in place. The state puts removal of a residential tank at roughly $1,000 to $5,000 depending on size and access, and says a tank abandoned in place has to be emptied, cleaned and purged of all vapours. Testing tells you about today: in the state's words, no test can predict what will happen next year, next month, or even the next day.
The line that matters to a seller is this one, from the same guidance: a bank or the buyer likely will ask for an environmental assessment or the removal of the tank. Deciding that yourself, before you list, is cheaper than deciding it in attorney review with a contract at risk.
If there is contamination, it has to be reported to the state Spills Hotline on 1-800-457-7362. Many homeowner policies exclude pollution, so the cost can land on the owner. That is a reason to find out early, not a reason to leave it alone.
Sources: NYSDEC, Underground Heating Oil Tanks: A Homeowner's Guide, Article 12, Suffolk County Sanitary Code
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04
Cesspools, sewers, and the money the county will put in
A cesspool is not a reason a house cannot be sold, and plenty of houses here still have one. It is a reason a buyer asks questions, and it is the item most likely to come with a grant attached.
Suffolk County's Septic Improvement Program provides installation grants up to $20,000 per property depending on whether the project qualifies. The New York State Septic System Replacement Program provides grants or reimbursements of up to 75 per cent of eligible costs, not to exceed $25,000 per property. The two run through the same county application.
The conditions are worth reading before you assume you do not qualify. The property has to be an existing residential home, currently on a cesspool or septic system, not connected to municipal sewers, with taxes current and no liens, and with a valid certificate of occupancy.
Whether it is worth replacing before you sell or pricing for and leaving is a real question with no general answer. It depends on what the system is doing now, what comparable houses nearby have, and how long you can wait for a grant to come through. That is a conversation, not a rule.
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05
Roof, boiler and electrical service: fix it or price it
These three are where sellers spend money they did not need to spend, and save money they should have spent. There is no rule to follow here, so the honest framing is a question: does the item stop a buyer getting a mortgage or insurance, or does it just show up on the report?
Things that stop a deal get fixed or get priced with a number attached, because a buyer who cannot insure the house cannot buy it. Things that only show up on the report are usually cheaper to disclose and discount than to replace, because you will not get the cost of a new roof back in the price. A buyer values a new roof at less than you paid for it, every time.
What you should not do is find out about any of it from the buyer's inspector. Raise it yourself and you are describing a known condition. Wait, and you are answering for something you look like you were hiding.
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06
Asbestos siding, knob and tube, and other things that are not emergencies
Asbestos cement siding on a 1950s house is common and is not, by itself, a hazard while it is intact and left alone. It becomes a regulated job when somebody disturbs it. New York's asbestos rule exempts owner-occupied single-family dwellings where the owner performs the work themselves. Hire a contractor and the exemption does not apply: the work has to be done by a licensed asbestos contractor under Industrial Code Rule 56.
Knob and tube wiring is the other one that sounds worse than it usually is. It is original wiring with no ground, it will be written up, and what happens next depends on the buyer's insurer rather than on any state rule. Insurers differ, so the useful step is finding out what yours says before a buyer finds out what theirs says.
Neither of these needs solving in a panic. Both need knowing about before you are three weeks from a closing.
Sources: NYS Department of Labor, asbestos abatement homeowner exemption, Industrial Code Rule 56
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07
What you can reasonably leave undone, and how to say so
You are allowed to sell a house with problems in it. What you are not allowed to do is hide them, and New York changed the arithmetic on that.
Every seller of residential real property has to deliver a property condition disclosure statement to the buyer or the buyer's agent before the buyer signs a binding contract of sale, and a copy signed by both has to be attached to the contract. The form now covers flood history and flood zone as well as the building.
The old way out is gone. A seller who skipped the form used to owe the buyer a $500 credit and that was the end of it, which is why so many treated it as optional. That subdivision was repealed. A seller is now liable for a willful failure to meet the requirements, and the measure is the actual damages the buyer suffers.
So the practical answer on an older house is usually the same: find out what is wrong before you list, fix what blocks a mortgage or an insurance policy, write down what you are leaving, and price it. A defect you disclosed is something the buyer decided to accept. One you did not is the subject of RPL 465 above.
Sources: RPL 462, delivery of the disclosure statement, RPL 465, liability
What this page is and is not
General information about selling an older house in Suffolk County, with the source under each answer so you can check it. It is not legal advice, it is not an inspection, and it does not replace either. Rules differ by town, and a county or state programme can change its terms after the date at the top of this page.
Linda LaFleur is a Licensed Real Estate Salesperson with Signature Premier Properties. She is not a home inspector, an attorney or an engineer, and nothing here should be read as any of those.
Questions people actually ask
Do I need a certificate of occupancy to sell my house in Suffolk County?
The certificate comes from your town, and what you need depends on what has been built. Work done without a permit will not be on the existing certificate, and that is what has to be resolved before a closing rather than at one.
Towns have a route for older work. Brookhaven issues a Certificate of Existing Use for structures that predate the record. A valid certificate of occupancy is also one of the conditions for the Suffolk County septic grant, so it is worth settling early.
There is an oil tank in my yard. Do I have to remove it before I sell?
There is no blanket state rule forcing removal of a residential tank, but Suffolk is a delegated county with its own regulations, so the county health department is the authority on your tank.
The state's own homeowner guidance is blunt about what happens in a sale: a bank or the buyer likely will ask for an environmental assessment or the removal of the tank. Removal of a residential tank runs roughly $1,000 to $5,000. Deciding before you list costs less than deciding during attorney review.
Can I sell a house on Long Island that still has a cesspool?
Yes. Many houses here still have one. It becomes a negotiation rather than a barrier, and there is county and state grant money attached to replacing it.
How much will Suffolk County pay towards replacing a cesspool?
The county Septic Improvement Program provides installation grants up to $20,000 per property depending on whether the project qualifies, and the New York State Septic System Replacement Program provides up to 75 per cent of eligible costs, not to exceed $25,000 per property.
The property has to be an existing residential home on a cesspool or septic system, not on municipal sewers, with taxes current and a valid certificate of occupancy.
Do I have to fix everything the buyer's inspector finds?
No. An inspection report is a list of observations, not a list of obligations. What usually has to be dealt with is anything that stops the buyer getting a mortgage or an insurance policy.
The rest is a choice between fixing it and pricing for it, and pricing for it is often the better arithmetic, because a buyer values a repair at less than it costs you.
Do I have to tell a buyer about a problem I already know about?
Yes. Every seller of residential real property in New York has to deliver a property condition disclosure statement to the buyer or the buyer's agent before the buyer signs a binding contract, and a signed copy is attached to the contract.
The $500 credit that used to be the only penalty for skipping it has been repealed. A seller is liable for a willful failure to meet the requirements, measured by the actual damages the buyer suffers.
Is asbestos siding a problem when I sell?
Intact asbestos cement siding that is left alone is not the emergency it sounds like. Disturbing it is the regulated part.
New York exempts an owner-occupied single-family dwelling where the owner does the work themselves. Hire a contractor and the work falls under Industrial Code Rule 56 and has to be done by a licensed asbestos contractor.
What does a home inspection cover in New York?
New York licenses home inspectors and defines the inspection as observing and reporting in writing on the systems and components of a residential building: heating, cooling, plumbing and electrical, the foundation, the roof, the masonry structure, and the exterior and interior components.
It is a report on the condition on the day, not a warranty of how long anything has left.
Not sure which of these your house has
Ask Linda. She sells in these towns and has been on the buyer's side of enough of these inspections to tell you which items will hold up a closing and which ones a buyer will price and move on from.
Talk to Linda See recent sales
Figures are from Linda LaFleur's own closed transactions, data courtesy of OneKey MLS as distributed by MLS GRID, covering September 2017 to October 2026.