How To Build A Sauna Outside

If you love the relaxing experience of a sauna, you may be interested in building one outside your home. Not only can it be a great addition to your backyard, but it can also provide you with a peaceful and rejuvenating experience. Here is a step-by-step guide on how to build a sauna outside.

Step 1: Choose the Right Location

The first step in building a sauna outside is to choose the right location. It should be a flat and level area that is away from any trees or other obstructions. You should also make sure that there is enough space for the sauna and any additional features you may want, such as a changing room or outdoor shower.

Step 2: Gather Materials

Once you have chosen the location, you will need to gather the necessary materials. This will include lumber, insulation, roofing material, and heating equipment. You may also need to purchase additional items such as benches, lighting, and ventilation.

Step 3: Build the Foundation

The next step is to build the foundation for your sauna. This will typically involve pouring a concrete slab or building a wooden frame. You will want to make sure that the foundation is level and sturdy to support the weight of the sauna.

Step 4: Install the Walls and Roof

After the foundation is in place, you can start installing the walls and roof. You will want to use materials that are durable and weather-resistant. This may include cedar, pine, or redwood. It is also important to insulate the walls and roof to keep the heat inside the sauna.

Step 5: Install the Heating Equipment

Once the walls and roof are in place, you can install the heating equipment. This may include a wood-burning stove, electric heater, or infrared panels. You will also need to install ventilation to ensure that the sauna is properly ventilated.

Step 6: Add Benches and Accessories

The final step is to add benches and accessories to your sauna. You may want to install benches along the walls or in a corner. You can also add a bucket and ladle for pouring water over the rocks to create steam. Other accessories may include lighting, a sound system, or a thermometer.


Q: How much does it cost to build a sauna outside?

A: The cost of building a sauna outside can vary depending on the size and materials used. On average, it can cost between $3,000 and $6,000.

Q: Do I need a building permit to build a sauna outside?

A: This will depend on your local building codes. You should check with your local zoning office to determine if a permit is required.

Q: How big should my sauna be?

A: The size of your sauna will depend on how many people you plan to accommodate. A typical size for a home sauna is 6′ x 8′, which can comfortably fit 2-4 people.

Q: How long does it take to heat up a sauna?

A: This will depend on the type of heating equipment you are using. A wood-burning stove may take up to an hour to heat up, while an electric heater may only take a few minutes.


Building a sauna outside can be a rewarding project that provides you with a relaxing and rejuvenating experience. By following these steps and gathering the necessary materials, you can create a beautiful and functional sauna that you can enjoy for years to come. Remember to always check with your local building codes and seek professional advice if needed.