Foundation Repair / Waterproofing in Marshfield, Massachusetts

Mass Save will not pay to fix a foundation or install a waterproofing system. The program covers heating, cooling, water heating, and weatherization, not structural or drainage work, so be wary of any contractor who ties a French drain to an energy rebate. Marshfield is Eversource territory and not a municipal light plant, so homeowners here are Mass Save eligible for the overlapping work: basement air-sealing and crawl-space insulation. A free Mass Save Home Energy Assessment can unlock air-sealing subsidized at 75 percent or more, up to program caps, which pairs well with encapsulating a damp coastal crawl space. Radon mitigation sometimes piggybacks on sump and basement work, but radon is not a Mass Save measure and is billed on its own.

Massachusetts has no foundation-contractor license, but the contractor must be Home Improvement Contractor (HIC) registered with the Office of Consumer Affairs, and any structural repair needs a Construction Supervisor License plus a building permit from the Marshfield building department. Significant work like pier underpinning or wall rebuilds requires PE-stamped drawings from a registered Professional Engineer. Because so much of Marshfield is coastal and low-lying, exterior excavation, regrading, or drainage near the harbors, rivers, marsh, or flood zones almost always triggers Marshfield Conservation Commission review under the Wetlands Protection Act, so a dig-out near the shore usually needs a filing first.

Marshfield sits on the South Shore, where costs run near Boston metro but below the city core. A standalone sump pump install runs $1,200 to $3,000, more with the battery backup that matters here given coastal storm outages. A full interior perimeter French drain with a sump usually lands at $8,000 to $20,000 depending on linear feet. Crawl-space encapsulation, common in shoreline cottages, runs roughly $5,000 to $15,000. Single crack injection runs $400 to $900 per crack. Exterior excavation and membrane waterproofing, harder near the high water table, runs $15,000 to $30,000 or more.

Marshfield is a South Shore coastal town in Plymouth County, home to about 25,782 people across 11,584 housing units, with a median build age near 57 years. Much of the stock is postwar and later, so poured-concrete and block foundations dominate, including a heavy share of slab-on-grade and crawl-space cottages in shoreline neighborhoods like Brant Rock, Green Harbor, and Ocean Bluff.

Water is the defining issue. With the Atlantic on one side and the South and Green Harbor rivers cutting through, the water table sits high and close to the surface across the flats. Salt air, tidal flooding, and seasonal storm surge mean sump pumps, crawl-space moisture control, and perimeter drainage are the everyday jobs here, more than deep structural cracking.