Commonwealth Plumbing Corp

Commonwealth Plumbing Corp is a Rockland outfit that, by its own account, has done union plumbing work around greater Boston since 1990, founded by Tom Hannon and later joined by his brother Peter and sons Tom Jr. and Matt. The company says it belongs to Local 12 Plumbers & Gas Fitters. Its public review trail online is short — just one rating so far, and it's a perfect five stars — so there isn't much of a track record to lean on yet. What is verifiable holds up: its Massachusetts plumbing license is active, and BuildZoom puts its contractor score at 100, in the top 13% of the state's licensed contractors. One thing worth asking about directly: the company's own account puts its founding in 1990, while its BBB file records a 2011 start date and 15 years in business — a gap worth clearing up before assuming decades of continuous operation under this name. The BBB listing also carries no accreditation and no rating. For a small, licensed, union-affiliated shop with a strong contractor score but a thin public review history, it's worth calling a recent reference directly rather than leaning on star counts alone.