Thompson Waterproofing, Inc.

Thompson Waterproofing keeps water out of large masonry buildings. Its 18 permitted jobs — repointing, sealant and waterproofing work in Brookline, Chestnut Hill, Cambridge, Newton and Barnstable — are almost all commercial, at a typical permit value around $131,000, with five pulled in the past three years. The Quincy company has been at this since 1991, its BBB profile says, with five employees and Lisa Higgins as president. On Procore, where it has listed itself since April 2022, it describes its work as waterproofing, air barriers, dampproofing and masonry for commercial, healthcare, infrastructure and institutional clients across Massachusetts and Rhode Island, and counts 33 projects there, 11 of them active. Its BBB page grades it A+. One thing to settle first: the state register shows the company's Massachusetts home improvement contractor registration, #185597, as expired. That registration is what covers residential work in Massachusetts, so ask where it stands before signing anything for a house. Best suited to a building owner or property manager with an envelope problem — a leaking foundation wall, failing joints, masonry that needs restoration. Ask about recent buildings like yours, and confirm current licensing and insurance before work starts.