Insuring a Nantucket home: how the coastal market actually works now
The boring paragraph got interesting
For decades, insurance was the boring paragraph in an island purchase — you called an agent, a binder appeared, the closing proceeded. That era is over on the Massachusetts coast. Carriers have gotten cautious, premiums have become a real diligence item, and the structure of who insures what has quietly reorganized. None of this makes a Nantucket house uninsurable — far from it. But buyers who understand the market's new shape negotiate better, budget honestly, and avoid the eleventh-hour scramble that now catches people who treated insurance as an afterthought.
One scope note before we start: wind and flood are different products. This page covers the homeowners market — the policy that responds to wind, fire, and everything ordinary. Flood is a separate policy with its own maps and its own logic, and it has its own guide.
What changed in the coastal market
The pattern is regional, not Nantucket-specific: standard national carriers have pulled back from writing new business on exposed coastal property across Cape Cod and the Islands. In their place, the load has shifted to specialty insurers and — increasingly — to the state's backstop. The Massachusetts FAIR Plan now covers about four in ten homes on the Cape and Islands, a share that has climbed steadily in recent years.
Read that correctly: it is not a collapse, it is a reorganization. Island houses get insured every week. What disappeared is the assumption that any given carrier will quote any given house — coverage is now assembled property by property, which is why the insurance question moved from the closing checklist into diligence.
The FAIR Plan, in plain terms
The Massachusetts FAIR Plan — formally the Massachusetts Property Insurance Underwriting Association — is the state's insurer of last resort: an industry-backed pool that must consider property owners the voluntary market declines. On the islands it functions less like a last resort and more like a standing pillar of the market. What buyers should know about it:
The hurricane deductible: the number that surprises people
Coastal Massachusetts policies — FAIR Plan and voluntary market alike — typically carry a percentage deductible for named-storm or hurricane losses: commonly 1% to 5%, calculated on the dwelling coverage limit, not the loss.
The arithmetic is what makes eyes widen. On a house insured for $3 million of dwelling coverage, a 5% hurricane deductible means the first $150,000 of storm damage is yours before the policy responds. That is an illustration, not a quote — but it is exactly the kind of number that should be in your budget model, next to the premium, when you evaluate a coastal property.
Two details worth pinning down on any policy you're offered: the trigger (policies differ on what activates the percentage deductible — a named storm, a hurricane warning, a defined window) and whether a lower percentage is available, since deductible, premium, and mitigation are negotiated together.
What actually drives a Nantucket quote
Underwriters price island property on a fairly consistent set of questions:
Mitigation moves the needle at the margins: storm shutters, roof work, water-leak detection. Programs and credits change, so treat mitigation as a conversation with the agent rather than a fixed menu.
How buyers should run it
The operating rule: get the insurance read during diligence, not after. Alongside the septic report and the flood map in the buyer's guide, the insurance quote is now one of the numbers that can legitimately move a negotiation.
Once you own: the annual checkup
The market is moving too fast for autopilot renewals. An hour a year with your agent is worth real money: confirm the dwelling limit still matches replacement cost (island construction costs move, and underinsurance is quiet until it isn't), re-ask whether a carrier that declined you two years ago is writing again, and revisit the deductible trade now that you know the house.
Keep the documentation habit, too. Every roof invoice, every system upgrade, every mitigation improvement goes in one folder — it prices the next renewal, and when you eventually sell, that file becomes part of the house's story. Sellers with clean records negotiate from a stronger position on exactly the questions buyers now ask.
Nantucket home insurance — frequently asked questions
Can you still get homeowners insurance on Nantucket?
Yes — every island closing includes it. What changed is the path: fewer standard carriers, more specialty placements, and a large role for the state's FAIR Plan. Coverage is assembled per property now, which takes a little longer and rewards starting early.What is the Massachusetts FAIR Plan?
The state's insurer of last resort — an industry pool that considers property the voluntary market declines. On the Cape and Islands it now insures roughly four in ten homes, which makes it less a fallback than a fixture of coastal ownership.Does homeowners insurance cover flooding?
No. Rising water is a separate flood policy with its own maps, zones, and pricing — covered in the flood zones guide. Wind-driven damage is the homeowners policy's territory; the wind/water line after a storm is exactly why documentation matters.What is a hurricane deductible?
A percentage of your dwelling coverage — commonly 1% to 5% — that applies instead of the flat deductible when a defined storm event triggers it. On high-value houses it is a six-figure number worth modeling before you buy, and the trigger definition is worth reading as closely as the percentage.Does renting the house change my insurance?
Yes — occupancy and rental use belong on the application, and short-term-rental activity in particular needs to be disclosed and endorsed properly. The premium difference is real; a denied claim is far more expensive.Will an older house cost more to insure?
Usually, unless its systems are documented as updated. Roof, wiring, plumbing, heat — underwriters price the house's actual condition, and renovation paperwork is the cheapest premium reduction there is.Get the insurance read before you offer
Sean Kalman is a sixth-generation Nantucketer, a Nantucket REALTOR®, and the founder of The Kalman Co., brokered by eXp Realty. He thinks the insurance quote belongs in the same diligence folder as the septic report — and that surprises belong in negotiations, not closings. Reach him at sean@thekalmanco.com or 508-228-4578. Equal Housing Opportunity.