Building a sauna is a project that gives both increased value to the home and an opportunity for relaxation all year round. At Konstruktionshjälpen, we are passionate about helping you through the entire construction process – from idea and planning to finished sauna and maintenance. Here we have put together a detailed guide with everything you need to know to create a durable, pleasant and affordable sauna.
What is a sauna and why build one?
A sauna is a heated environment where steam and high heat are used to create a relaxing and healthy atmosphere. Saunas can provide a number of health benefits: reduced stress, improved blood circulation and muscle relaxation. For those who build it themselves, every sauna is also a pleasure created with their own hands.
Planning and preparation: Set a clear plan with budget and time frame
When building a sauna, it is important to start with a well-thought-out plan. At Konstruktionshjälpen, we recommend that you think about use, budget and site selection before starting construction. A simple sauna for 2-4 people can cost around SEK 30,000, while a more luxurious outdoor sauna can go up to SEK 100,000 depending on materials and equipment.
Choice of location and size for your sauna
Indoors or outdoors? For an indoor sauna, bathrooms and basements are popular places where it is often easy to run electricity and ventilation. An outdoor sauna requires a stable foundation, often in the form of a concrete slab.
Size and capacity: A sauna of approximately 4-6 square meters can accommodate 2-4 people. With a ceiling height of 2.1 metres, you get both good air circulation and efficient heat distribution.
Structural Drawing Section: Wall Structure and Insulation
In a sauna, the wall structure and insulation are crucial to maintaining the heat and creating a safe and efficient sauna experience. In this section of the construction drawing, we present the layers of the wall and how each component contributes to the functionality of the sauna. From the inside, the wall starts with a wood panel in aspen, known for its heat resistance and durability. The panel is attached to joists with a gap to accommodate the insulation, usually 70mm stone wool, which is particularly effective against heat loss.
Outside the insulation, we add a vapor barrier in aluminum foil to prevent moisture from entering the walls, which protects the wood and reduces the risk of mold. The outer panel is placed at the end, depending on whether the sauna is indoors or outdoors, which provides both protection and a stylish finish. This wall structure not only ensures heat retention, but also durability and an energy-efficient sauna.
Do you need help with construction drawings or building permit drawings ? Contact us at Konstruktionshjälpen - we are here to support you throughout your sauna project, from planning to completion.
Material selection and cost calculations
In order to get the best possible sauna experience, the choice of material is crucial. Here is what we at Konstruktionshjälpen recommend:
Walls and ceilings:
Wood species: Spruce and aspen are favorites for walls and ceiling panels due to their heat resistance. A quality spruce panel costs around SEK 80-100 per square meter.
Insulation: Use stone wool or glass wool as insulation, which costs around SEK 50-80 per square meter.
Vapor barrier: Aluminum foil works excellently as a vapor barrier and protects the wood from moisture. Price: about SEK 15-25 per square meter.
Floor:
Concrete slab with moisture barrier: A concrete floor is stable and affordable (SEK 500-800 per square meter including labour). Concrete needs a moisture barrier to prevent moisture from rising into the wood.
Wooden floors made of larch or teak: Moisture-resistant types of wood such as larch and teak are perfect for sauna floors and cost around SEK 200-400 per square meter.
Interior and benches:
Benches in aspen or alder are both durable and comfortable to sit on. Calculate around SEK 400-800 per meter of bench depending on the type of wood and dimensions.
The construction process - step-by-step from Konstruktionshjälpen
Foundation: For outdoor saunas, a concrete slab is recommended for stability and durability.
Build the frame and insulate: Assemble a wooden frame with 45x70 mm studs. Fill the gaps with insulation (rock wool or glass wool) and then cover with a vapor barrier.
Wall and ceiling panel: Install the panel in aspen or spruce for both walls and ceiling. Mount the wood horizontally or vertically according to design preferences.
Install benches: Benches are placed in two levels for a better heating experience and are attached with stainless screws.
Electrical installation and sauna unit: We at Konstruktionshjälpen recommend hiring a qualified electrician to install units and lighting. An electric unit costs between SEK 4,000 and 7,000, while wood-burning units are slightly more expensive.
Heating system: Electric or wood-fired?
Electric units are practical and easy to install, especially for indoor saunas. They come in several sizes and capacities – a 4.5 kW unit, which is adequate for a smaller sauna, costs around SEK 4,000–7,000.
Wood-burning units are a perfect choice for those who want a traditional sauna experience. They are usually slightly more expensive and require the installation of a chimney. A complete wood-burning unit with chimney costs approximately SEK 6,500-10,000.
Design and sauna interior
We at Konstruktionshjälpen recommend that you choose a style that harmonizes with your surroundings and your home. For a rustic feel, untreated wood and stone can be a beautiful choice. LED lighting is also a popular feature that creates an atmospheric atmosphere. Glass doors, which cost between SEK 2,000 and 4,000, open up the sauna room and give a modern impression.
Ventilation and safety: Important factors
Ventilation is a crucial part of the sauna, both for safety and comfort. The sauna should have a supply air valve near the unit and an exhaust air valve at ceiling height at the opposite end to ensure good circulation. Properly installed ventilation also prevents moisture damage and improves heat distribution. At Konstruktionshjälpen, we ensure that the ventilation is dimensioned correctly according to the size and location of the sauna.
Maintenance and care
Keeping the sauna clean and fresh increases both durability and the experience. Here are some of our care tips:
Clean benches and walls regularly with a mild soap.
Ventilate properly after each use.
Treat wooden surfaces with oil annually to protect against moisture and wear.
Regular maintenance saves costs over time and ensures that the sauna remains a pleasant and hygienic place.
Summary and enjoyment
Building a sauna is an exciting investment in both the home's and your own well-being. When the sauna is ready, it's time to invite family and friends or enjoy a moment to yourself in the heat. With the help of Konstruktionshjälpen, you can be sure that every step in the construction process takes place professionally and according to your wishes.
A sauna is not only a place for relaxation, but also an investment in health and well-being – a place where you can let go of everyday stress and find peace.
