3. Dig a space for rocks if you are using lava rocks to heat your sauna. If using infrared heating, make sure you have enough power for the heating...

4. This should be a simple structure consisting of wooden boards. Leave room for three ventilation points: one in the ceiling, one on the floor, an...

5. Insulate the inner frame with fiberglass and add a vapor barrier to keep moisture off the fiberglass and help it last longer.

6. Build a simple outer wall about a foot (or 30 cm) outside the inner frame.

7. Roof the sauna with simple wood or tile and remember to keep a ventilation spot open for steam to escape.

8. Install your heating system, following instructions given with the system, and leave a wide space for the sauna heater.

9. Place the first layer of flooring using ceramic tile. This goes over your heating system and will collect moisture.

10. Lay a second layer of flooring using unsecured boards. You should be able to easily remove these and clean the tiles.

11. Install the sauna heater.

12. Add any benches, windows and other fixtures as desired.