Marshfield, MA Home Insurance: Brant Rock, Green Harbor & Inland Homes

Home · Flood · High-Value · Umbrella · Massachusetts
By Jon Merwin, Founder and CEO
Published October 2026

Insuring a house in Marshfield starts with one question: which side of the seawall, marsh or river is it on? A raised home on the Brant Rock esplanade, a converted cottage in Ocean Bluff, a house near the Green Harbor marshes and an antique colonial in Marshfield Hills all look different to an underwriter. Portsmouth Atlantic Insurance has been a family-owned independent agency since 2005, and we are licensed in Massachusetts. Instead of fitting your home into one company’s rules, we shop it across 40+ carriers and tell you which ones actually want to write your street. Start with our overview of homeowners insurance, or keep reading for what matters in Marshfield.

Where you live in Marshfield changes the policy

Marshfield was first settled in 1632, dates its founding as a town to 1640 and grew as a collection of separate villages. According to the town’s Multi-Hazard Mitigation Plan, it has roughly five miles of Atlantic shoreline, salt marshes woven between the Green Harbor, South and North Rivers, and a population of about 25,000 that grows to about 40,000 in summer. The same plan notes that most of the ocean coastline is protected by seawalls, and that waves overtop them in storms, sometimes carrying cobblestones into the streets behind. That is why neighbors a short walk apart can get very different quotes.

• Brant Rock. The town’s plan says the low-lying esplanade just inland from the seawall floods multiple times a year, to a depth of one to two feet, and that in the January 4, 2018 storm some areas had more than three feet of standing water. The town has since raised 1,200 feet of the Brant Rock seawall by 3.5 feet, and several houses have been raised on open piles. Carriers ask about elevation, foundation type and how close the house sits to the wall.
• Ocean Bluff. Ocean Bluff sits behind a seawall and stone revetment, and the town’s plan names Brook Street and Foster Avenue as flood concerns. The same plan records that in April 1941 a fire started in the marsh behind the beach and, driven by high wind, leveled about 500 buildings in the crowded cottage colony; zoning rules changed afterward. Fire is part of the picture here too, so carriers ask about roof type, distance to neighboring houses and fire protection.
• Fieldston. According to the town, Fieldston floods both from heavy rain and from waves topping the seawall, with water collecting near Monitor and Mayflower Roads because of low elevations, a high water table and slow drainage into Bass Creek.
• Rexhame. Rexhame Beach sits at the old mouth of the North and South Rivers, before the Portland Gale of 1898 cut a new inlet farther north. The town lists the end of Rexhame Road and parts of Standish Street as flood concerns, and the Rexhame area is one of its repetitive flood-loss areas in a VE zone.
• Green Harbor. Early English settlers called the whole town Green’s Harbor, and today the village mixes homes around the harbor, beach and marshes. The town’s plan names Bay Street, Bay Avenue, Avon Street and Brighton Street as flood concerns, and in March 2018 sections of the Bay Avenue seawall collapsed after erosion undermined the foundation. The town’s coastal resilience study estimated that about 41% of projected coastal flood losses fall in the Bass Creek-Green Harbor Marsh area, behind the Dyke Road flood control structure.
• Marshfield Hills. Once called the Highlands, this village in the north of town toward the North River is home to the Marshfield Hills Historic District, listed on the National Register. Older homes here raise rebuilding-cost questions as much as flood questions.
• Inland Marshfield. North Marshfield, Seaview, West Marshfield along Plain Street and the downtown area carry less surge exposure, though homes near the rivers, creeks and marshes can still be mapped into a flood zone. Wooded lots bring tree and ice-storm risk that carriers ask about.

Flood coverage along the Marshfield coast

A homeowners policy will not pay for rising water, whether it is a wave carrying cobblestones over the seawall or the tide backing up through the marsh. Flood is its own policy. In its 2023 plan, the town reported that FEMA counted 207 repetitive flood-loss properties in Marshfield in 2022, all on or near the coast, tidal waterways or marshes. Your first step is checking your address on FEMA’s Flood Map Service Center or the town’s GIS flood map. The town’s flood insurance page lists recent map revisions, including a 2020 coastal revision that affected 2,249 Marshfield properties, so an older flood determination may be out of date. Lenders require flood insurance for federally backed mortgages in a special flood hazard area, but homes just outside the line can still take on water.

• NFIP through Selective. We write National Flood Insurance Program policies through Selective, a Write Your Own carrier. Coverage starts after a waiting period, generally 30 days for a new policy (see FloodSmart), so buy before storm season, not during it.
• Private flood. When a shoreline home is worth more than the NFIP building limit, or you want coverage for things the NFIP leaves out, we compare Flow Flood, Neptune Flood, Beyond Floods, The Flood Insurance Agency, CatCoverage and Aon Edge. Whether each one will write a given address varies, especially in a VE zone.
• Elevation matters. If your home has been raised or has flood vents, an elevation certificate can make a real difference in how flood carriers rate it. Keep a copy with your insurance records.

More on how flood policies work is in our flood insurance overview.

Hurricane and named storm deductibles: know the dollar figure

Shoreline policies in Massachusetts commonly carry a separate hurricane or named storm deductible. The Massachusetts Division of Insurance puts the usual range at 1% to 5% of insured value. Because it is a percentage, the more your house is insured for, the larger the check you would write after a storm. When we present options, we convert each one to dollars so you can compare a lower premium against a bigger deductible, or the reverse. If no standard carrier will take a house on the seawall, the Massachusetts FAIR Plan is a last resort, and we will put it side by side with any private option.

Older, converted and rebuilt homes

Marshfield has a deep stock of older homes, from the Marshfield Hills Historic District to the Thomas-Webster Estate, the home Daniel Webster bought and where he gave his last speech shortly before his death in 1852. Along the shore, many houses began as summer cottages and were later winterized, expanded or raised after storms. All of these raise the same question: is the dwelling limit high enough to rebuild to today’s code? For older homes we build the replacement estimate around restoration-quality work and add ordinance or law coverage. For converted, raised or rebuilt homes we make sure the carrier knows about the new foundation, roof and systems, since those updates can help. More detail is in our guide to historic home insurance.

Larger Marshfield homes

Under about $2 million, most of our 40+ carriers are in play, including Cincinnati, which also writes standard homes (typically with at least $150,000 of dwelling coverage). Around $2 to $3 million, Hanover is among the carriers we compare. Andover writes up to about $2.25 million in Massachusetts, sometimes higher with underwriting approval, and Openly and National General write up to about $5 million. Over about $3 million, Cincinnati is our go-to, and Chubb, which focuses on high-value homes, joins it above $5 million. These policies are designed for custom construction and tend to offer broader replacement cost terms, fewer sublimits and options for scheduling jewelry, art or wine. Which carrier fits depends on the home and on how close it is to the water. Our coastal Massachusetts high-value home insurance page explains more, and if Marshfield is your summer place, see Massachusetts second home insurance.

Liability for boaters, beach-house hosts and summer crowds

A typical Marshfield household might keep a boat in Green Harbor, fill the house with family all summer and rent a beach cottage for a few weeks a year. Each one adds liability exposure. An umbrella policy adds an extra layer of liability protection over home, auto and boat. The underlying limits need to meet the umbrella carrier’s minimums, and that is easiest to manage when one agency handles all of them.

Serving Marshfield from New Hampshire

We work with Massachusetts clients by phone, email and video from our Portsmouth, NH office. We also insure homes elsewhere on the South Shore, including neighboring Duxbury, Cohasset, Hingham, Hull and Plymouth, and in Scituate, including Humarock just across the South River. For statewide information, see Massachusetts homeowners insurance.

Get a Marshfield home insurance quote

Fill out the form below and tell us about the house, or call (603) 431-4020.

Marshfield home insurance FAQs

Is my Marshfield home in a flood zone?

It depends on the exact address. Marshfield’s FEMA maps include VE zones along parts of the seawall neighborhoods, where waves are a factor, and AE and AO zones in other low-lying areas near the marshes and rivers, while much of inland Marshfield sits outside the mapped special flood hazard area. The maps have also changed in recent years, including a coastal map revision in 2020 and further revisions in 2023, so check again even if you looked before. We look up your address on FEMA’s Flood Map Service Center and the town’s GIS map, then quote NFIP coverage through Selective or a private flood policy if it fits better.

Can I get homeowners insurance on a house right behind the seawall in Brant Rock, Ocean Bluff or Green Harbor?

Often, yes, but fewer carriers write right on the water, and they look hard at elevation, foundation, roof age, distance to the seawall and past storm claims. We shop the house across our carriers, and if no standard carrier will take it, we compare the Massachusetts FAIR Plan against any private option so you can see both.

Does homeowners insurance cover a nor’easter?

Wind damage from a nor’easter is generally covered by a homeowners policy, subject to your deductible. Water from storm surge, waves coming over the seawall or the tide backing up through the marsh is flood, and that needs a separate flood policy. Some shoreline policies also carry a separate named storm deductible, so we show you both deductibles in dollars.

Do you insure Humarock homes too?

Yes. Humarock is part of Scituate, but it sits just north of Rexhame Beach and the only road access is through Marshfield. Underwriters look at the specific address, including access, distance to a fire station and hydrants, and exposure to wind and water from both the ocean and the South River. We describe your Humarock home accurately to each carrier so the quote reflects the real property.

My Marshfield house started out as a summer cottage. Will carriers still write it?

Many will, especially once the home has been winterized, updated and set on a solid foundation. Carriers ask about the roof, heating, electrical and plumbing, and whether the house is lived in year-round. We tell each carrier what has been updated and make sure the dwelling limit reflects what it would cost to rebuild today, not what the cottage was once worth.

Sources

• Massachusetts Division of Insurance, hurricane preparation notice (Aug. 8, 2024)
• Massachusetts Division of Insurance, “Massachusetts Property Insurance Underwriting Association”
• FEMA, “Flood Map Service Center”
• FEMA FloodSmart, “Buy a Flood Insurance Policy”
• Town of Marshfield, “Flood Insurance” (map revisions)
• Town of Marshfield, “GIS, Zoning and Flood Map”
• Town of Marshfield, Multi-Hazard Mitigation Plan (adopted Dec. 4, 2023)
• Town of Marshfield, Multi-Hazard Mitigation Plan, full report (Dec. 2023)
• Town of Marshfield, Long-Term Coastal Resiliency Plan, final report
• North and South Rivers Watershed Association, “The Storm That Changed the River’s Flow”
• Krusell and Bates, “Marshfield: A Town of Villages, 1640-1990” (introduction)
• MAGenWeb, “Marshfield, MA” history
• Town of Marshfield

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.

Jon Merwin, Founder and CEO, Portsmouth Atlantic Insurance
Jon founded Portsmouth Atlantic Insurance in 2005. The family-owned independent agency is licensed in 10 states, compares 40+ carriers, has 1,000+ Google reviews and over 2,000 testimonials across our two offices and charges no broker fees. Meet our team.