Foundation Repair / Waterproofing in Nantucket, Massachusetts

Mass Save does not pay for foundation repair or waterproofing, the program funds heating, cooling, water heating, and weatherization, not piers, French drains, or crack injection. Ignore any rebate claim tied to a sump or drainage system. The real overlap on the island is crawl-space encapsulation and basement air-sealing and insulation, which can qualify for Mass Save weatherization incentives, with air-sealing often subsidized at 75% or more up to program caps.

Nantucket is served by Eversource, an investor-owned utility, so homeowners here are Mass Save eligible. A free Home Energy Assessment opens the weatherization rebates, and sealing a damp island crawl space is a common qualifying project. Radon mitigation often shares trenching with basement work but is not a Mass Save measure.

Massachusetts has no foundation-contractor license, so confirm Home Improvement Contractor (HIC) registration. Structural repair, piers, steel beams, or wall rebuilds, requires a licensed Construction Supervisor and a building permit from the Nantucket building department, with PE-stamped engineer drawings for significant work. The entire island falls under Historic District Commission review, so any visible exterior foundation work needs approval. Coastal frontage and wetlands also bring the Conservation Commission in under the Wetlands Protection Act for exterior excavation, drainage, or regrading.

Nantucket pricing is the highest in the state because crews, equipment, and every bag of cement arrive by ferry or barge, and lodging for off-island trades adds to labor. Crawl-space encapsulation, a common island project, can run well above the mainland $5,000–$15,000 band. Crack injection runs $400–$900 per crack plus freight. An interior perimeter French drain with a sump pump starts around $8,000–$20,000 but trends high. Repointing and stabilizing an antique brick or granite foundation is specialty work priced job by job.

Nantucket is an island town and its own county, with 14,065 year-round residents and about 12,287 housing units, a ratio that reflects heavy seasonal ownership. The median construction age is near 42 years overall, but the core holds one of the densest concentrations of pre-1850 homes in the country, many on brick, fieldstone, and granite-block foundations in the historic district.

Island conditions define the work. Sandy soils drain fast, but a high coastal water table, salt air, and old crawl-space-and-cellar housing drive moisture, rot, and encapsulation needs, while the historic core's antique foundations need careful repointing and stabilization rather than tear-out.