Unpermitted work is ordinary in older Commack houses
You may not know which parts are the problem, and that is common. Owners who bought years ago inherited whatever the previous owner built and had no reason to go looking.
A certificate of occupancy describes the house the town believes it approved. If the basement, the deck or the extension is not in that description, the work was very likely done without a permit. An expeditor or an attorney can pull the file and tell you where the gaps actually are.
How we help Commack owners with unpermitted work
Buying the house is the part everyone understands. It is rarely the whole of what somebody in this position needs.
We have been buying houses on Long Island for 15+ years and we have legalized plenty of unpermitted work in that time, so we know the expeditors, the architects who draw the as-built sets, and the attorneys worth calling when a file is genuinely stuck. We make those introductions whether or not the Commack house ends up being ours. Describe what was built and roughly when, and we will tell you what permits are likely involved.
What this looks like in Commack specifically
Commack is roughly 36,536 people in Suffolk County, ZIP 11725, and the housing stock is mostly colonial, split-level, ranch. Around Jericho Turnpike and Commack Road, most of it is old enough that the mechanicals are on their second or third life. We have been buying across Suffolk County for 15+ years. We know what the Commack Union Free School District does to a resale price, which blocks still have oil tanks in the ground, and what a house like yours is actually worth here.
The median is up 7.69% year over year as of 2026-05. A firming market gives you a little room for error on price, which is worth more than it sounds when the house is not in showable condition. At a $840,000 median, Commack buyers are paying enough that they expect the house to be finished. A dated kitchen is a deduction in a cheaper market and close to disqualifying in this one, which is why unrenovated houses here sit while the renovated ones move. The median house here goes under contract in about 29 days, which is quick for Long Island. It is also a figure that only applies to property in showable condition.
Why the buyer's lender cares about unpermitted work
A mortgage lender is lending against the house the town has on record, not the house you have been living in. When an appraiser measures finished space that does not appear in the certificate of occupancy, the questions start.
What usually follows is a request for permits, or for the work to be legalized before funding. That lands on the seller, on a deadline, at a pace the building department sets rather than the buyer. It is the most common way this ends an otherwise healthy contract.
Legalizing unpermitted work after the fact
The construction itself can be the smallest part. Drawings have to be produced, an application filed, fees paid, and inspectors given access to things that are now behind finished walls, which sometimes means opening them up again.
Then there are the outcomes nobody plans for: a structure standing where nothing is allowed to stand, or a conversion the zoning will not allow at all. Legalizing unpermitted work can end in a variance application, and that is a timeline of its own entirely.
What the two paths cost in Commack
These are the two routes open to you with a house with unpermitted work, priced against what Commack houses actually sell for.
Work it against Commack's own numbers. The median sale here is $840,000. A 5% commission on that is $42,000, and seller closing costs of about 2% add roughly $16,800. Those are costs we can cover on our side. That is $58,800 gone before anyone counts the repairs it took to get the house listable.
There are two waits in a listed sale and people usually only count the first. In Commack the median house takes about 29 days to go from listed to a signed contract. Then it waits again, typically 45 to 60 days, while the buyer's lender orders an appraisal and underwrites the loan. Call it 74 to 89 days from sign to keys, assuming nothing goes wrong.
The part worth understanding is what a signed contract actually guarantees, which is less than most sellers assume. A retail buyer with a mortgage contingency can walk away right up to the end. If they do not qualify, if the appraisal comes in under the price, if they change their mind and let the financing lapse. A share of deals die exactly there, after months of waiting, and the house goes back on the market with time on it. We are not borrowing anything, so there is no lender to satisfy, no appraisal to come in low and no contingency to exercise.
| Listing with an agent | Selling to us | |
|---|---|---|
| Sale price | $840,000 (Commack median) | Our written offer |
| Commission | −$42,000 | None |
| Seller closing costs | −$16,800 | We can cover them |
| Repairs before listing | Out of pocket | None |
| Cleanout | Yours | Ours |
| Showings | Until it sells | One visit |
| Listed to signed contract | 29 days (Commack median, once listable) | 24 hours to a written offer |
| Contract to closing | 45 to 60 days (waiting on the buyer's lender) | A date you choose |
| Total wait | 74 to 89 days if nothing falls through | Yours to set |
| Can the buyer walk? | Yes (mortgage contingency runs to the end) | No financing to fall through |
| Before repairs and carrying | $781,200 | The number we put in writing |
The listing column assumes a 5% commission and seller closing costs of about 2%. Both vary. We have not subtracted repairs or the cost of carrying the house while it sits, because those depend on the property. A house in good condition listed with a good agent can absolutely beat a cash offer, and we will say so if that is your situation.
What unpermitted work costs you on the Commack open market
The median house in Commack sold for $840,000 and took about 29 days to go under contract, then another 45 to 60 days waiting on the buyer's mortgage. That is 74 to 89 days in total, for a house that was ready to show on day one. That is the ordinary path, for a house whose paperwork matches the building.
Unpermitted work adds a third wait that belongs to the town rather than to either party. You would be funding drawings and applications up front, on a house you are leaving, with no certainty about the timeline and none about the outcome. Run that against a clean sale on a date you choose before you commit to it.
How we arrive at a number on a house with unpermitted work
On a house with unpermitted work we start from the end: what it sells for once the work is done. From that we take away the cost of the work and a margin for the chance that we have misjudged either one. That is the whole method. Nothing is hidden in it.
- What it is worth repaired. Not the Commack median of $840,000 on its own, but what houses like yours on your street actually closed at recently.
- What the work costs. Roof, boiler, electric, the kitchen and bath. In Commack the stock is largely colonial and split-level, and on houses that age the mechanicals are usually the expensive part rather than the cosmetics.
- How long we will hold it. The median Commack house goes under contract in about 29 days once it is showable, then waits 45 to 60 days more on the buyer's lender. Ours has to get to showable first, and we carry taxes and insurance across the whole of it.
- What we are wrong about. Walls and floors hide things until they come up. We price for that uncertainty, and it accounts for much of the distance between a cash offer and a retail price.
How we can pay this and still make it work
Most cash buyers skip this part. We do not. We run millions of dollars of construction a year, so we buy materials at contractor prices and keep our crews busy all year. The same renovation costs us roughly half of what you would be quoted as a homeowner.
That difference is how we make money. It is also why renovating before you sell seldom comes out ahead: you would pay retail for the roof and the boiler and then hope a buyer pays you back for them. Most of the time they do not. Our margin comes from building for less, not from buying from you for less.
If our number does not work for you, tell us. We would much rather hear it than push. We will go through your situation and give you a straight view of your options, including the ones that leave us out. A lot of people do better listing with an agent, and if you are one of them we will tell you now rather than have you find out later.
We buy Commack houses with the work left unpermitted
Tell us everything, including the parts you would rather not write down. When the deck went on, who finished the basement, whether a permit was ever pulled, whether the town has ever sent a letter about it.
None of it makes us withdraw and all of it makes our number solid the first time. Deals fall apart on partial information, and being renegotiated late is exactly the experience you are trying to avoid when there is work like this on the house.
Common questions
Will unpermitted work stop a buyer getting a mortgage on a Commack house?
Frequently, yes, and it is the reason unpermitted work matters far more at sale than it ever did while you lived there. The loan is secured against the house as the town's records describe it, and an unpermitted addition is not in those records. Some Commack buyers get past it with a cooperative lender and a long timeline. Many do not. Selling for cash removes the question entirely.
Do I have to pull permits before selling my Commack house?
Not to sell to us. We buy with the work unpermitted and take the file on afterward. Whether you need them for any other purpose is worth putting to an attorney.
The previous owner did the unpermitted work. Does that change anything?
Not for us, and not for the town either, because the file follows the property rather than the person who built the addition. It is one of the most common versions of this we see.
Will the town find the unpermitted work when I sell my Commack house?
What the town knows and when is not something anyone should guess at. Your attorney can tell you what a sale in your situation actually triggers. From our side, nothing you disclose changes our offer.
There is already a violation for the unpermitted work. Can you still buy?
Yes, and it is a common starting point for these conversations. Tell us what the notice says and we will price it once rather than being vague now and revising on you later.
How much does unpermitted work take off the price of a Commack house?
It depends what it would take to legalize it and what the risk is that the town says no. A finished basement is usually a smaller adjustment than an addition sitting in a setback. We would rather price it accurately once than revise later.