Foundation Repair / Waterproofing in Arlington, Massachusetts

Mass Save does not pay for foundation repair or basement waterproofing. The program covers heating, cooling, water heating, and weatherization, not structural or drainage work, so ignore any contractor who attaches an energy rebate to a French drain. Arlington is Eversource territory and not a municipal light plant, so homeowners are Mass Save eligible for the overlapping work: basement air-sealing and insulation, plus crawl-space encapsulation where it applies. A free Mass Save Home Energy Assessment can unlock air-sealing subsidized at 75 percent or more, up to program caps, which is worthwhile in these old leaky cellars. Radon mitigation often shares trenching and a sump with waterproofing, but radon is not a Mass Save measure and is priced separately.

Massachusetts has no foundation-contractor license, but the contractor must be Home Improvement Contractor (HIC) registered, structural work requires a Construction Supervisor License and a permit from the Arlington building department, and significant structural repair needs PE-stamped engineering drawings. Two local wrinkles apply. Tight lot lines on Arlington's older streets often rule out exterior excavation, making interior drainage the practical route. And properties near Spy Pond, the Mystic Lakes, or Alewife Brook can fall under the Arlington Conservation Commission through the Wetlands Protection Act, so an exterior dig-out or drainage outfall on a low waterside lot may need a filing first.

Arlington sits in inner Boston metro, where tight access and labor rates push costs toward the higher end. Crack injection on a poured wall runs $400 to $900 per crack, though many Arlington foundations are stone or brick, where repointing and interior drainage replace injection. A full interior perimeter French drain with a sump pump in an old cellar typically runs $8,000 to $20,000, higher when the slab must be cut around irregular stone walls. A sump pump install runs $1,200 to $3,000 with backup. Stabilizing a bowing brick or block wall with carbon-fiber straps or steel beams runs roughly $5,000 to $12,000.

Arlington is a dense, fully built-out Middlesex County town just northwest of Cambridge, about 45,906 residents across 20,381 housing units, with a median construction age near 80 years. Much of the stock predates World War II: tightly packed two-families, bungalows, and Colonials on brick, granite-block, and rubble fieldstone foundations, with poured concrete mostly on the smaller share of postwar infill.

Water defines the work here. Arlington wraps around Spy Pond and borders the Mystic Lakes and Alewife Brook, and many older neighborhoods sit on low, clay-heavy ground with a high water table. Crews mostly do interior French drains in stone-walled cellars, stabilize brick walls bowed under soil pressure, and repair freeze-thaw cracks, since dig-out room between houses is scarce.