In Chappaqua, the Deck Nobody Permitted Becomes the Seller's Problem at Closing

"A valid and subsisting Certificate of Occupancy or other required certificate of compliance, or evidence that none was required."

According to Betensky Law, that phrase comes from Paragraph 16(b) of the standard New York residential contract of sale. It makes delivering that certificate a condition the seller must meet before closing, and it covers the house and every other improvement on the lot. Paragraph 10 also requires the seller to clear any notices of violation from the building, housing or fire department by the closing date. Betensky Law, a Mount Kisco firm, wrote in August 2026 that finished basements, in-ground pools, accessory apartments, and kitchen or bath renovations done without permits or a certificate of occupancy are among the most common reasons New York residential closings stall or fall apart.

The contract decides who has to fix the problem. In Chappaqua, the Town of New Castle's fee schedule decides how much it costs. Under both, the seller with the most choices and the lowest stress is the one who opens the building file before the house goes on the market.

What New Castle charges to legalize work after the fact

New Castle's posted 2026 Building Department fee schedule includes an "As Built Fee." It applies to living space, including decks, gazebos and pools, built without a permit. The fee is a flat $1,000, plus three times the construction permit fee, plus a $51 C/O application fee. For sheds, the flat portion drops to $500 and the rest of the formula stays the same.

For comparison, the same schedule prices a residential addition, alteration or renovation permit at $150 for the first $1,000 of construction cost, plus $18 for each additional $1,000. A final certificate of occupancy or certificate of compliance is $50.

Here is that arithmetic for two common projects, using only the Town's posted fees:

At either size, legalizing the work later costs about four times what the permit and CO would have cost when it was built. These are Town fees only. Betensky Law's checklist for getting a house in order before a sale also includes a permit expediter, the as-built filing itself and inspections. The table covers none of those costs, or the cost of any changes an inspection requires.

Mechanical systems are priced separately. The 2026 schedule lists a legalization fee for HVAC, electrical and plumbing work equal to twice the permit fee. That line does not appear in the Town's 2025 building fee table. The as-built formula for living space and sheds was already in the 2025 schedule. The as-built cost isn't a new penalty, and there is no amnesty program behind it. It has been the standing price for some time.

A caution on dates: the Building Department section of the Town's fee PDF is labeled "2026," but other sections of the same document read "Proposed 2026," and the file shows no adoption date. Confirm the figures with the Building Division before relying on them.

Why the timing falls entirely on the seller

The contract adds the time pressure. Betensky Law's summary points out that under Paragraph 11(c), none of the seller's representations or obligations survive closing unless the contract says otherwise. An unpermitted pool or finished basement therefore has to be resolved before the deed passes, and the buyer is not obligated to waive the condition.

That's why the as-built fee is a different expense depending on when it shows up. Before listing, it's a project the seller schedules. After a buyer's attorney or title company finds the problem under contract, the same fee comes with a closing date attached, a buyer waiting on the outcome and less room to negotiate. Betensky Law says the buyer's attorney or title company is often the one who discovers these issues.

The disclosure form raises the question early

Chappaqua sellers can't leave the subject for the buyer's side to bring up. Chapter 484 of the Laws of 2023 removed the $500 closing credit that used to let New York sellers skip the Property Condition Disclosure Statement. The change took effect March 20, 2024. Unless an exemption applies, Real Property Law §462 now requires the seller to complete and sign the statement and deliver it before the buyer signs a binding contract.

The current Department of State form took effect July 1, 2025. Question 9 asks, "Are there certificates of occupancy related to the property? If no, explain below." The form tells sellers to answer from actual knowledge and to deliver a revised statement if an earlier answer turns out to be materially inaccurate, no later than the transfer of title or the buyer's occupancy, whichever comes first. Under §465, a willful failure to meet the law's requirements can create liability for actual damages.

So a seller who knows the deck or basement was never permitted runs into the question on paper before any contract is signed. Pulling the building file before filling out the form means answering Question 9 from records, not memory.

How the buyer is paying changes the outcome

Once a CO gap is on the table, the buyer's financing decides how much room there is to work around it. Betensky Law notes that Fannie Mae's Selling Guide requires appraisers to flag illegal uses and additions built without permits and to assess how they affect value and marketability. Lenders and their title insurers tend to hold off on funding until the issue is resolved, the price is adjusted or money is held in escrow.

An all-cash buyer doesn't face an appraisal or investor requirements. That buyer and their own title insurer can decide case by case to accept the risk, negotiate a credit or ask for an indemnity, and they can close faster. In practice, according to the same summary, a cash buyer is more likely to close over an open CO issue than a buyer with institutional financing.

For a seller, an unresolved permit issue can shrink the pool of buyers who can close without conditions. For a buyer with a mortgage, a seller's offer of a credit may not settle a problem the lender still has to sign off on.

Where the title search fits

Many buyers assume title insurance will catch and cover a permit problem. Stewart Title's New York guidelines for title agents, published in 2022, list certificate of occupancy and building department searches among the standard municipal searches. The same guidelines describe most municipal searches as informational. They aren't insured and aren't part of the title commitment. As general practice, an open permit can surface during due diligence without being a title defect the policy covers.

New Castle offers its own record letter. The 2026 schedule lists a "Title Search/Predate Letter" at $250, plus $100 for each additional building, and sealed copies of a CO or certificate of compliance at $25. A seller can order that letter before listing for less than the cost of a single legalization filing.

Doing it in the order the fee schedule rewards

1. Pull the file first. Request the Town's records for the property, including the CO of record, and compare them with what is actually built: deck, pool, finished lower level, any addition. Betensky Law recommends this step before listing.
2. Ask about the systems as well as the square footage. Replacing a furnace or adding a circuit falls under the separate HVAC, electrical and plumbing legalization line at twice the permit fee.
3. Check for permits that were opened and never closed. The schedule lists an "Administrative Permit Close out Fee" of $100 per 90 days and residential permit renewals at 50% of the original fee or $1,000, whichever is less, for six months. The schedule doesn't say what triggers the close-out fee, so ask the Building Division how it applies to your file.
4. Estimate the as-built cost against the original permit cost. Use the $150 plus $18 per $1,000 formula to see what the work would have cost to permit, then apply the as-built formula to see the cost today.
5. Answer Question 9 from the records. Fill out the disclosure statement after you know what the file shows.
6. Build in extra time. If an issue is known, tell the buyer's attorney early and plan the closing date around the legalization timeline. Betensky Law gives the same advice.

None of this is legal advice. Every step above belongs in a conversation with your real estate attorney.

Quick answers

Does New Castle offer an amnesty for old unpermitted work? Neither the Town's 2025 nor its 2026 fee schedule lists one. The as-built formula appears in both years.

What does a temporary certificate cost? The 2026 schedule lists a temporary residential CO or certificate of compliance at $1,000 for three months. Ask the Building Division and your attorney whether it applies to your situation and whether your buyer's lender would accept it.

Is the CO application just a formality? No. On the Town's CO application form, last revised May 21, 2026, the applicant attests that the structure conforms to the building code and was built according to the approved plans.

If you're planning to sell in Chappaqua and aren't sure what the Town file shows about your deck, pool or finished basement, Lizette Sinhart can help you review those records before listing, while you still set the timeline. Let's find your forever home — get in touch.