Keystone Masonry and Chimney,Foundtaion Waterproofing

Water pouring into a house during a December storm, several chimney companies called, and James returned the voicemail in 30 minutes and was at the door within the hour. That is a January 2024 account, and it is the clearest picture of how this Waltham company works: fast, hands-on, and most at home where masonry meets water. The work splits between chimneys and wet basements. Customers writing in March 2026 described a full foundation excavation with waterproofing and a drainage system, fieldstone basement walls that had leaked for years sealed up dry, and multiple foundation cracks repaired with hydraulic cement behind a full waterproofing membrane and a new sump system. A Cambridge fieldstone foundation was repaired the same month, after years of moisture. On the chimney side, a March 2026 customer had theirs rebuilt from inside the attic and noted how clean the crew kept the space. February 2026 brought a crown repair with a new cap, a cap replacement bundled with a sweep and flashing repairs, and a falling-apart chimney on a historical Dorchester home finished on the promised timeline. In a 2023 review, a customer said other masons had not bothered hunting for brick to match their old chimney; Keystone did. Two things to weigh before booking. The Massachusetts home improvement contractor registration, 209863, is expired. And the run of praise is not unbroken: an April 2026 reviewer left one star over a no-show, and a June 2022 customer hired to repoint a chimney and patio said the job turned into a rebuild and the new quote they asked for repeatedly never came. Against that, a February 2026 customer whose front walkway and stairs were fixed up said a minor issue found a few months later was put right promptly and at no additional charge. For a chimney rebuild, a crown or cap, or a basement that takes on water every time it rains, this is a specialist worth the call. Ask where the registration stands, and get the revised number in writing the moment the scope changes — that is where the one serious complaint started.