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What costs $300 to $500 per square foot but disappears at the touch of a button?

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What costs $300 to $500 per square foot but disappears at the touch of a button?

Perhaps the most famous disappearing pool is the one in the Beverly Hills High School gym, or maybe it is the one used in the Cirque du Soleil show O, at the Bellagio Resort and Casino in Las Vegas. Either way, both will have some serious competition in the new disappearing pool tucked inside an otherwise conventional recreational center in Bonney Lake, Washington, 39 miles outside of Seattle. Belgium-based HydroFloors built the pool for the Seven Summits Lodge clubhouse at Trilogy at Tehaleh, a Baby Boomer residential housing development by homebuilding giant Shea Homes. While the clubhouse and lodge designed and built by Zetterberg Gregory Design and Zetterberg Custom Homes comes in the classic, Pacific Northwest vernacular of exposed wood and timber framing, the pool brings high-tech flexibility to the residential community.

In fewer than 10 minutes, the 49- by 29-foot lap pool converts into a floor for meetings, dances, and other events. When lowered, the movable floor “opens” the pool, which can hold close to 44,000 gallons of water. When the floor is raised completely, it hides the pool. The pool floor, which costs around $300 to $500 per square foot, sits on a metal grid supported by Styrofoam blocks and relies on a hydraulic ram and cable system to move up and down.


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