By Jon Merwin, Founder and CEO
Greenwich has more than 30 miles of shoreline along Long Island Sound, along with harbors, coves, and rivers that run through some of its most beloved neighborhoods. For many families, the water is the reason they chose Greenwich. It is also the reason flood coverage deserves careful attention, especially for higher-value homes where the cost to repair or rebuild can be substantial.
Portsmouth Atlantic Insurance is an independent, family-owned agency founded in 2005. We work with 40+ carriers and help Greenwich homeowners coordinate flood coverage with their high-value homeowners policy, so the pieces fit together before a storm rather than after one.
Why Flood Planning Matters in Greenwich
Standard homeowners insurance, including high-value homeowners policies, generally excludes flood. That means damage from storm surge, a river rising over its banks, or heavy rain that pools and enters the home typically isn’t covered by your home policy. Flood coverage is a separate policy, and for Greenwich homes the limits, structure, and deductibles matter as much as having a policy at all.
Many Greenwich homes also feature finished lower levels, wine rooms, gyms, home theaters, and mechanical systems below grade. Those spaces can be costly to restore, and some flood forms restrict coverage in basements. Understanding exactly what your flood policy covers, and where it doesn’t, is an important part of the planning.
Neighborhoods Where Water Shapes the Conversation
Old Greenwich
Old Greenwich sits on a peninsula with Greenwich Point Park at its tip, surrounded by water on several sides. Homes near the shore, along the coves, and on low-lying streets can be exposed to storm surge and coastal flooding during nor’easters and tropical systems. Older homes that have been expanded or renovated may also face code-driven upgrades if they are significantly damaged.
Riverside and Cos Cob
Riverside borders the Sound and the Mianus River, and Cos Cob wraps around the Cos Cob Harbor and the river’s mouth. That combination of coastal and river exposure means both surge and heavy-rain flooding are part of the picture. Homes set back from the shoreline can still be affected when water backs up into coves and low-lying areas.
Waterfront estates, harbors, and Byram
From Belle Haven and Indian Harbor to Mead Point and the waterfront near Byram, Greenwich has many estate properties directly on the water. These homes often have docks, seawalls, pool houses, and guest cottages, along with custom construction that can take a long time to restore. They also tend to have rebuild costs well above what standardized flood limits are designed for.
Your Flood Zone Is Not Your Full Risk
FEMA flood maps are a helpful starting point. They influence whether a lender requires flood insurance and how some policies are rated. But a flood zone designation is not a full picture of risk. Homes outside mapped high-risk zones can and do flood, and maps change over time.
What matters for your home includes its elevation, the elevation of the lowest floor, foundation type, where your mechanicals sit, local drainage, and proximity to the Sound, a cove, or a river. Two homes on the same street can have very different exposure. If you have an elevation certificate, keep it handy; it can help when comparing options.
Flood Coverage Options for Greenwich Homes
NFIP flood insurance
We write National Flood Insurance Program policies through Selective, a Write Your Own (WYO) carrier. Selective issues and services the policy, but the coverage terms are set by FEMA’s NFIP.
The National Flood Insurance Program provides standardized residential flood policies, often written and serviced through participating insurance companies. NFIP coverage works well for many homes, but it carries set maximum limits for building and contents, restricts coverage in basements, and does not include additional living expense. A waiting period usually applies before new coverage begins, with limited exceptions.
Private flood insurance
Private flood insurance is written outside the NFIP. Depending on the property, private flood may offer higher building and contents limits and additional coverages such as additional living expense. Terms and availability vary by home and change over time. Private flood markets we may consider include Flow Flood, Neptune Flood, Beyond Floods, The Flood Insurance Agency, CatCoverage, and Aon Edge.
Excess flood above a primary policy
For many Greenwich waterfront and high-value homes, one practical structure is a primary flood policy plus an excess flood policy that adds limits above it. Another is a single private policy with higher limits. The right choice depends on the home, its exposure, your lender, and what the market offers at the time. We lay out the options side by side so you can see the trade-offs clearly.
For a broader overview, see our Fairfield County CT flood insurance guide.
Westport’s Shoreline: Compo, Saugatuck Shores and the Saugatuck River
Westport faces the same Long Island Sound storms as Greenwich, with its own mix of exposures. Homes near Compo Beach and on Saugatuck Shores sit close to open water, and properties along the Saugatuck River and its tidal coves can see water rise from both the Sound and the river. Many waterfront homes have been rebuilt or raised over the years, so the elevation certificate, foundation type and flood zone on FEMA’s Flood Map Service Center matter as much as the address.
For larger Westport homes, rebuild cost is often well above NFIP building limits, so we compare private and excess flood alongside the NFIP. See our coastal home insurance in Connecticut page for how wind deductibles and flood fit together.
Coordinating Flood With Your High-Value Home Policy
Flood coverage works best when it is planned alongside your homeowners policy (see our guide to homeowners insurance in Greenwich, CT), not bolted on separately. For Greenwich homes, we look at several connections.
Ordinance or law and elevation requirements
If a coastal home is substantially damaged, rebuilding may need to meet current flood-resistant building requirements, which can include elevating the structure or relocating mechanicals. Those costs can be meaningful. We review how your homeowners policy’s ordinance or law coverage and your flood policy each respond, so you understand where gaps may exist.
Named-storm deductibles
Many Connecticut coastal homeowners policies have a separate hurricane or named-storm deductible, often a percentage of the dwelling limit. On a high-value Greenwich home, that percentage can translate into a sizable amount. Wind damage generally falls under your homeowners policy and its storm deductible, while rising-water damage falls under your flood policy and its own deductible. Knowing both numbers ahead of time is part of good storm planning.
To see how flood fits into the bigger coverage picture, visit our Greenwich CT high-value home insurance page and our luxury home insurance guide for Greenwich, Darien, and Westport.
Practical Steps Before Storm Season
- Confirm you have flood coverage, and note its building and contents limits
- Compare your flood building limit to your home’s rebuild cost
- Know your homeowners storm deductible and your flood deductibles
- Locate your elevation certificate, or ask whether obtaining one makes sense
- Photograph or video your home’s contents, including lower levels
- Ask how basements, finished lower levels, and outbuildings are treated
- Put coverage in place early, since waiting periods often apply
Why Work With an Independent Agency
Because we’re independent, we aren’t limited to a single flood program or carrier. We compare NFIP, private, and excess options and coordinate them with your high-value homeowners policy and umbrella. Our clients have shared 1,000+ Google reviews and over 2,000 testimonials across our two offices; you can read some on our client feedback page.
Request a Greenwich Flood Review
If you’re unsure whether your flood coverage matches your home’s value, or how it works with your storm deductible, we’re happy to help. Request a review through our quote form, email insure@portsmouthatlanticins.com, or call (603) 431-4020.
Frequently Asked Questions
Does my Greenwich homeowners policy cover flood?
Generally, no. Homeowners and high-value homeowners policies typically exclude flood. You’ll need a separate NFIP or private flood policy.
I’m in Old Greenwich but not in a high-risk zone. Should I consider flood insurance?
Often, yes. Flood zones are a starting point, not your full risk. Elevation, drainage, and proximity to water all matter.
What if my Greenwich home’s rebuild cost is higher than NFIP limits?
Options may include a private flood policy with higher limits or excess flood coverage above a primary policy. We compare both.
Does flood insurance cover my finished basement?
It depends on the policy. NFIP coverage in basements is restricted, while some private policies are broader. We’ll review exactly what applies.
How does a named-storm deductible relate to flood?
They’re separate. The named-storm deductible applies to wind damage under your homeowners policy; flood damage falls under your flood policy and its deductible.
How far in advance should I buy flood insurance?
Well before storm season. Waiting periods typically apply, so coverage purchased right before a storm may not be in effect in time.
From Old Greenwich to Riverside to the waterfront, we’ll compare NFIP, private, and excess flood options and show how they work with your high-value policy and storm deductible.
Request My Greenwich Flood Review · Email insure@portsmouthatlanticins.com · Call (603) 431-4020
For more on coverage across the state, visit our Connecticut insurance agency page, or call us at (603) 431-4020.