GroundHouse blends coffee, sauna, and cold plunge in Caldwell opening

GroundHouse opened in Caldwell with a coffee lounge on one side, a Finnish sauna and cold plunge on the other, and a clear pitch: this was not just a recovery stop, but a place to linger. At 307 Bloomfield Avenue, Suite 101, the business branded itself as “your third space” and “The Compound’s third chapter,” pushing the cold-plunge model closer to coffeehouse culture than gym-floor grit.

The setup was built around a 60-minute Sauna + Wellness Lounge Drop-In priced at $35, with a single-barrel cold plunge add-on for $20. GroundHouse also sold a Restore membership for four visits a month at $140 and an Elevate membership for eight visits a month at $240. The structure matters because the plunge was not being sold as a stand-alone dare. It was positioned as one part of a larger routine that also included private changing suites, digital lockers, showers, towel service, and a quiet relaxation lounge.

GroundHouse said each cold plunge was individually scheduled and refreshed between guests, a detail that gives the place a more private, less chaotic feel than the typical wellness-gym add-on. That approach should make first-timers more comfortable, especially people who are curious about cold exposure but want to pair it with coffee, heat, and a slower entry point. The company’s coffee side reinforced that logic with organic, 100% arabica, pesticide-free coffee along with specialty drinks, elixirs, and smoothies.

The business also had family history behind it. Danielle Kermizian and Brian Kermizian already ran The Compound Coffee Co. in Verona, which opened in the fall of 2020. A profile from The Montclair Girl said the couple had been in the fitness business since 2009, and that background helps explain why GroundHouse read less like a trend chase and more like an extension of an existing hospitality-and-fitness brand. The idea was to fuse intentional energy, connection, and balance into one room.

GroundHouse arrived as part of a broader April 7 roundup of 16 new North Jersey businesses, but it stood out because it tapped into a larger shift in suburban wellness: the effort to build a true third place around recovery. That pitch lands in a market where cold plunges are getting more mainstream, but the health claims remain contested. Harvard Health has said the evidence for benefits is thin and warned that people with cardiovascular disease, especially heart rhythm abnormalities, should avoid it. A PubMed Central review has also said the effects of voluntary cold-water immersion remain a subject of debate. GroundHouse is betting that coffee, design, and social comfort can make the practice feel less extreme, and that may be the smart move.