The Katonah Bathhouse was a reconstruction to replace a structure destroyed by fire. Lothrop Associates redesigned the new building utilizing the existing slab and foundation with stone veneer over concrete block walls. The roof structure has large exposed truss timbers and tongue and groove cedar roof sheathing. Natural light and ventilation are provided through operable windows, skylights and open gable ends. Ceiling fans and pendant hung light fixtures add air movement and ambiance. The 3,500 square foot building houses a covered shade area, dressing rooms, lockers, showers and toilets, offices, first aid and a lifeguard lounge.