In July 2026, a 1921 house at 13 Mortimer Drive in Old Greenwich sold for $2.3 million against a $2.495 million ask. On paper it looked like an ordinary negotiation: 2,228 square feet, a 0.12-acre lot, no garage. What actually moved the price was written into the flood file. The house sits in the AE Zone, its basement took on water most recently during Hurricane Sandy, and any future addition or major renovation will require raising the structure roughly 10 feet to meet current standards. The buyers, transplants from the Upper East Side, closed anyway. But the gap between ask and sale price tells you something the square footage never could.
That gap is becoming the norm rather than the exception, and a new state law means buyers will see it earlier in the process than ever before.
A New Line on the Disclosure Form
As of July 1, 2026, Connecticut's Public Act 25-33 requires every seller of residential property to fill out a dedicated Flood Risk Awareness section on the state's Residential Property Condition Report before a buyer signs a binder, contract, or option to purchase. The current form asks sellers directly whether they or a prior owner ever received FEMA or SBA disaster assistance for flood damage, and whether the structure has experienced water penetration during a named storm. Insurers face a parallel requirement: starting the same date, any homeowners or renters policy issued or renewed in Connecticut must carry a notice, in plain language, that the policy does not cover flood loss and that separate flood coverage is available.
The form itself is blunt about why this matters. It states plainly that FEMA flood maps "are not designed, nor intended to be, a reliable tool for buyers to assess a property's flood risk," and that a property does not have to sit near water to flood. For an Old Greenwich buyer used to treating the flood zone line as a formality, that sentence is the whole point of the new law. The zone letter on a listing sheet was never the full picture. Now the seller has to put more of that picture in writing, on paper, before you make an offer.
Why the Zone Letter Moves the Price
Old Greenwich waterfront carries two zone designations that behave very differently on an insurance bill: AE and VE. AE covers areas expected to flood during a base storm event. VE, the coastal high-hazard zone, adds wave action to that risk and requires open pile or pier foundations for new construction. The difference between the two shows up immediately in premium quotes.
| Scenario | Estimated Annual Premium |
|---|---|
| VE zone, NFIP policy, $250,000 building coverage, no contents | ~$12,278 |
| VE zone, private-market alternative, same coverage | ~$864 |
| AE zone, NFIP policy, prior loss, no elevation certificate | ~$3,363 |
| Connecticut statewide average, NFIP | ~$1,426 |
| Stamford average, NFIP | ~$1,065 |
These figures come from 2025 and 2026 Connecticut flood insurance market comparisons and are illustrative rather than a quote for any specific address. But the spread inside a single zone designation is the real lesson here. A VE-zone property without an elevation certificate can face a federal premium north of $12,000 a year, while an equivalent property with documentation in hand and access to the private surplus-lines market might pay under $1,000 for similar coverage. That is not a rounding error in a carrying-cost conversation. It is the difference between a buyer walking into an easy yes and a buyer asking for a price reduction to cover a decade of insurance.
What Raising a House Actually Costs
The Mortimer Drive listing flagged a 10-foot raise as a condition of future improvement, and that number deserves context. Elevating a home above its Base Flood Elevation typically runs $20,000 to $80,000 for straightforward pier-and-beam projects, with full foundation replacement or larger structures reaching $150,000 or more. Under FEMA's Risk Rating 2.0 methodology, each foot a home sits above Base Flood Elevation can cut the annual flood premium by roughly 30 percent, so the math often pencils out over time. It does not pencil out instantly, and a buyer needs to know whether that cost belongs to them or to the seller's asking price before they write an offer.
Greenwich's own building code adds another layer. Development inside the town's Flood Hazard Overlay Zone falls under Section 6-139.1 of the Building Zone Regulations, which governs what can be built and how high it must sit. A buyer planning a kitchen addition or a second story on a Lucas Point or Binney Lane property should confirm early whether that project counts as a "substantial improvement," the threshold at which the whole structure has to be brought up to current flood standards rather than just the new square footage.
The Streets Where This Actually Shows Up
Old Greenwich's flood exposure is not evenly distributed. The listings most likely to carry an AE or VE designation cluster in a handful of named waterfront enclaves: Lucas Point, Shorelands, Binney Lane, Rocky Point Road, Meadowbank Road, Ford Lane, and Tomac Lane. These are also some of the most sought-after addresses in town, which is exactly why the flood detail matters more here than almost anywhere else in Fairfield County. A buyer touring a home on Tomac Lane is not choosing between a flood zone and a non-flood zone. They are choosing between degrees of exposure that carry very different insurance and renovation math, and the listing sheet rarely spells that out.
A Market With No Room to Absorb a Surprise
Old Greenwich is not a market where a buyer discovers a flood-zone detail during attorney review and simply asks for two more weeks to think it over. In the first quarter of 2026, SmartMLS records show Old Greenwich among Greenwich's fastest-moving submarkets, averaging under 40 days on market with sale-to-list ratios above 103 percent. Greenwich's broader median sale price stood at $1.85 million as of August 2026, per SmartMLS data, in a market where inventory has stayed thin enough to keep multiple offers common on well-priced homes.
That pace cuts both ways. A seller who has not pulled together flood history, elevation documentation, and current insurance status before listing risks a slower, messier process once the new disclosure requirement forces those questions into the open. A buyer competing for a home in under 40 days does not have the luxury of a leisurely insurance-shopping exercise after the offer is accepted. The flood picture needs to be part of the offer decision, not an afterthought discovered at closing.
What This Means Before You List or Offer
If you are selling waterfront property in Old Greenwich, get ahead of the new disclosure requirement rather than filling it out under deadline pressure. An elevation certificate on file, a documented flood claims history, and a current sense of what insurance actually costs on your specific address turn a potential negotiating liability into a straightforward conversation. Buyers respond better to a seller who has already done the homework than to one who is visibly guessing at answers on the condition report.
If you are buying, ask for the elevation certificate and flood history before you write an offer, not after. Get a real insurance quote, not an estimate, before your financing contingency runs out. And treat the zone letter on the listing sheet as the start of the conversation rather than the end of it. AE and VE are not interchangeable, and the gap between them can be worth thousands of dollars a year for as long as you own the house.
A Few Common Questions
Does every home in Old Greenwich need flood insurance? No. Flood insurance is federally required only for homes in a Special Flood Hazard Area financed with a federally regulated or federally insured mortgage. Many Old Greenwich buyers choose to carry it anyway given the town's coastal exposure, but the requirement itself is tied to the loan and the zone, not to the neighborhood as a whole.
Does an elevation certificate guarantee a lower premium? It does not guarantee a specific number, but it is often the single document that unlocks private-market pricing and Risk Rating 2.0 discounts that an NFIP policy without documentation cannot access. Without one, insurers default to more conservative assumptions about the lowest floor elevation, which tends to push the premium higher.
Can a seller decline to answer the new flood disclosure questions? The law requires the seller to answer to the extent of their own knowledge. If a seller genuinely does not know whether a property has flooded before, "unknown" is an acceptable answer under Connecticut's disclosure statute. Sellers cannot check "no" if they know otherwise, and doing so exposes them to the same liability that applies to any other misrepresented material fact on the report.
If you are weighing a sale in Lucas Point, Binney Lane, or anywhere else along Old Greenwich's waterfront, the flood file is worth pulling together before the sign goes in the yard. Joshua Weisman works this submarket closely enough to know which documentation actually moves a negotiation and which just fills a folder. Reach out for a free home valuation and a straight read on what your specific address is worth in today's market.
