The document provides design guidelines for spa facilities. It recommends that interior design create a residential rather than institutional feel. Treatment areas should be soundproofed and use moisture-resistant, easy to clean materials. Locker rooms should include half and third size lockers, mirrors, hair dryers and outlets. Wet areas need saunas, lounging, hooks and ventilation. Color, texture, nature elements and dramatic doors enhance the sensory experience. Treatment rooms require sinks, storage and soundproofing. Space planning is a collaborative process that considers functions, traffic and ergonomics.