Pre-built ("pre-fab") sauna systems are designed for the consumer who wants to construct a sauna that is movable and easy to assemble. The modular systems can be assembled in minimal time in any area that has a hard surface, waterproof floor and electric service. Manufacturers make the electrical hookup easy with electrical conduit and control box, where necessary, pre-mounted and sealed in the panels. Each sauna room system is custom built to order.