Home · Flood · High-Value · Umbrella · Massachusetts
By Jon Merwin, Founder and CEO
Published October 2026
- Portsmouth Atlantic Insurance is licensed in Massachusetts and insures Cohasset homes, condos, cars and boats from our Portsmouth, NH office.
- Cohasset’s rocky shoreline, harbor and salt marshes put many homes near FEMA flood zones, so we check the flood map for your address before we quote.
- Coastal policies often carry a separate wind or named storm deductible, which the Division of Insurance says generally runs from 1% to 5% of insured value.
- Older homes around the Common and the harbor can cost more to rebuild than a newer house of the same size, so the dwelling limit and ordinance or law coverage deserve a close look.
Looking for home insurance in Cohasset, Massachusetts? Portsmouth Atlantic Insurance is licensed in Massachusetts and insures South Shore homes from our office in Portsmouth, NH. In Cohasset that means antique houses around the Common and Cohasset Harbor, shingle-style and newer homes along Jerusalem Road and Atlantic Avenue, and family homes inland. As an independent agency, we compare 40+ carriers instead of selling one company’s policy. Near the water, carriers look closely at distance to the shore, rebuild cost and the age of the home, and coastal appetite varies from company to company, so we check which of our carriers will write your address before we quote.
Can a Portsmouth agency insure a home in Cohasset, Massachusetts?
Yes. We hold a Massachusetts license and work with clients by phone, email and video. Cohasset households often insure more than the house: a few cars, a boat in the harbor, sometimes a second home on the Cape or in northern New England. One agent for all of it keeps coverage lined up and liability limits consistent. Nearby on the South Shore we also insure homes in Duxbury, Hingham and Plymouth, and further up the coast in Marblehead. For statewide notes, see our Massachusetts homeowners insurance page.
Flood risk in Cohasset
Cohasset sits on an exposed stretch of the South Shore between Hull and Scituate, with open ocean frontage, Cohasset Harbor, Little Harbor and tidal marsh along the Gulf River. The Massachusetts Office of Coastal Zone Management includes Cohasset in its South Shore region. Standard homeowners policies don’t cover flood, and if your lender requires flood insurance it is because the house is in a FEMA special flood hazard area. Look up your address on FEMA’s Flood Map Service Center or send it to us and we’ll check it.
- NFIP policies. We place NFIP flood policies through Selective, an NFIP Write Your Own carrier. NFIP building coverage has a federal cap and doesn’t pay for temporary housing during repairs.
- Private flood. For larger or waterfront homes we also compare private flood carriers: Flow Flood, Neptune Flood, Beyond Floods, The Flood Insurance Agency, CatCoverage and Aon Edge. Which ones can write a particular Cohasset home depends on the property.
- Waiting period. New NFIP policies generally have a 30-day waiting period, so don’t wait for a storm forecast. See FloodSmart for details.
Wind and named storm deductibles
Many coastal Massachusetts policies have a separate deductible for hurricanes or named storms. The Massachusetts Division of Insurance says these generally run from 1% to 5% of the home’s insured value, so on a larger home the dollar amount can be bigger than people expect. We show you the deductible in dollars and compare carriers that offer different options. If no standard carrier will write the home, the Massachusetts Property Insurance Underwriting Association (the FAIR Plan) is a fallback, and we can compare it with what the private market offers.
Historic and older Cohasset homes
Cohasset has many homes from the 1700s and 1800s, especially around the Common and the harbor village. Original framing, plaster, slate roofs and custom millwork cost more to replace than standard materials. Check with the Town of Cohasset on whether historic review applies to your property before you plan work. For insurance, we look at three things: a dwelling limit based on what it would cost to rebuild with like materials, ordinance or law coverage for code upgrades, and how long additional living expense coverage lasts if repairs take time. Our guide to historic home insurance goes deeper.
“Inflation over the past few years has pushed the cost to rebuild a Cohasset home well past where it used to be. The goal posts have shifted, and we’re seeing much higher dwelling coverage than in the past. Insurance companies are adjusting too and expanding their appetite for higher-value homes, so it’s worth checking that your dwelling limit has kept up.”
— Jon Merwin, Founder and CEO, Portsmouth Atlantic Insurance
High-value home insurance in Cohasset
Many Cohasset homes need more coverage than a standard policy is built for. For larger homes, Openly and National General write up to about $5 million, Cincinnati is our go-to over about $3 million, and Chubb, which focuses on high-value homes, joins it above $5 million. Which ones fit depends on the home’s value and on whether a carrier will write that address, which varies near the coast. High-value policies often add guaranteed or extended replacement cost, cash settlement options and higher limits for jewelry, art and collections. See our coastal Massachusetts high-value home insurance guide for more.
Umbrella, boat and auto
With a dock, pool, boat or teenage drivers, an umbrella policy adds liability limits over your home, auto and boat policies. For collector and high-value cars we compare Cincinnati, Hagerty, Hanover and Progressive.
Request a Cohasset home insurance quote
Tell us about the home and we’ll compare carriers. Or call our Portsmouth team at (603) 431-4020.
Cohasset home insurance FAQs
Do I need flood insurance in Cohasset?
If your home is in a FEMA special flood hazard area and you have a federally backed mortgage, your lender will require it. Even outside those zones, homes near the harbor, marshes or shore can flood, and standard homeowners policies don’t cover flood. We can quote NFIP coverage through Selective and compare private flood carriers.
What is a named storm deductible?
It is a separate deductible that applies to damage from a hurricane or named storm. The Massachusetts Division of Insurance says these generally run from 1% to 5% of the home’s insured value. We show it to you in dollars before you choose a policy.
Which carriers insure high-value homes in Cohasset?
For larger homes, Openly and National General write up to about $5 million, Cincinnati is our go-to over about $3 million, and Chubb, which focuses on high-value homes, joins it above $5 million. Availability depends on the home and its distance to the water.
Can you insure my older Cohasset home?
Yes. We look at the rebuild cost with like materials, ordinance or law coverage for code upgrades, and additional living expense limits, since repairs on older homes can take longer.
Do I need an umbrella policy in Cohasset?
It is worth a close look if you have a dock, pool or boat, teenage drivers or more than one home. An umbrella adds liability limits over your home, auto and boat policies.
Sources
- Massachusetts Division of Insurance, hurricane preparation notice (Aug. 8, 2024)
- Massachusetts Division of Insurance, “Massachusetts Property Insurance Underwriting Association”
- Massachusetts Office of Coastal Zone Management, “CZM South Shore Region”
- FEMA, “Flood Map Service Center”
- FEMA FloodSmart, “Buy a Flood Insurance Policy”
- Town of Cohasset
This page is general information, not a policy or legal advice. Coverage, forms and availability vary by state, carrier and property, and every policy is subject to underwriting. Your policy documents control.
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