Keystone Masonry and Chimney,Foundtaion Waterproofing

Keystone Masonry and Chimney works out of Waltham, and the company says it's been doing masonry, chimney, and foundation work for about 30 years as a locally owned operation — it doesn't name an owner or give a founding year, but it lists a service area stretching from Cambridge and Somerville out to Concord, Belmont, and Ipswich. It's catalogued here under waterproofing, but the reviews tell a narrower story: the calls that keep coming in are for chimneys. Crumbling caps, cracked crowns, a full rebuild pulled off from inside a customer's attic — that's the work people write in about. Recent Google reviews, nine of them since January with none negative, land on the same handful of jobs. One customer got a chimney crown repair and a new cap and called the price good; another had a cap replaced along with a sweep and some flashing work, and said the crew was quick and efficient. A third had a chimney rebuilt from inside their attic — some dust was unavoidable, they said, but the crew kept the site clean and finished with a full cleanup. On a walkway-and-stairs job, the crew came back months later to fix a small issue at no extra charge, the kind of no-questions-asked callback that shows up more than once across the company's history. That history has some real depth to it: 52 reviews going back to 2022, spread across four different sources, and Google's own page shows a 4.9-star average from 62 ratings. It isn't spotless, though — two pairs of reviews on file use nearly identical wording, differing only by which neighborhood the customer names, which is worth flagging even if it doesn't erase the broader pattern of praise. Before calling, ask for the same thing recent customers describe getting: a clear estimate and timeline before work starts. That's the detail that comes up again and again as what went right. This is a solid call for chimney repair — caps, crowns, full rebuilds — or a masonry-heavy foundation or waterproofing job in the Boston-metro towns it lists; for anything outside that lane, there isn't enough here to say.