Three years in business and already carrying a 4.9 average across 74 Thumbtack ratings, 97% of them five stars, with Top Pro status in 2023, 2024 and 2025. RNC Mechanical works out of 17 Malta St in Seekonk and describes itself as locally owned and operated, running 24/7 residential and commercial plumbing, heating and cooling across Southcoast Massachusetts and nearby Rhode Island. Its stated coverage runs Seekonk, Attleboro, Raynham, Taunton, Fall River, Swansea, New Bedford and over the state line into Providence, Pawtucket and East Providence.
Its Massachusetts plumbing licence is active, registered to Robert N Coulstring. Customers tend to thank people by name in their reviews - Rob, Chris, Christian - which is roughly what a six-person crew looks like from the homeowner's side.
What the 2026 reviews keep circling is speed and pricing. A homeowner replacing a combination boiler and heating unit in June wrote that RNC beat a previous estimate by a decent amount, scheduled the install for the next day, and left neat work behind. A March customer thanked the crew for taking a water heater on short notice. "Clean and precise work" is the sort of phrase that recurs, and a repeat customer called them out for turning up quickly a second time.
One thread worth pulling before you book. A June 2026 reviewer, satisfied with the job itself and with the techs, was still waiting for someone to come back and run silicone around a pipe opening. If your work has a finishing step, agree when that happens. The written history is also short and concentrated: the reviews on file all date from 2026 and arrive through Thumbtack, which syndicates them from Google, while the company's Angi and HomeAdvisor pages carry Approved badges and no reviews yet. Both directories list trade licence number 35658 with a 05/01/2028 expiration as the company's own report.
Beyond the platforms, a Nextdoor neighbour in North Providence, Rhode Island named the company in a January 2026 post, and a service-listing page repeats a line about quality craftsmanship and affordable pricing. Neither carries much alone.
For a water heater that quit overnight, a boiler swap, or gas piping anywhere in the Seekonk-to-Fall River corridor, this is a sensible shop to call: licensed, busy, and quick to schedule. Confirm the finish scope in writing, and ask which credential covers your job - Thumbtack's verified badge names a Rhode Island master plumber licence while its own profile text claims a Massachusetts master plumber.