Elegant Sauna with Terrace

Osa 350 outdoor sauna: 3.5 × 3.5 m with panoramic glazing and a thermowood terrace

The Bloomcabin Osa 350 pairs a generous sauna room with an integrated terrace in oiled thermowood. Its overall dimensions are approximately 350 cm wide, 350 cm deep and 266 cm high, with a 12.25 m² footprint. Broad panoramic glazing draws daylight into the room while keeping the garden in view. Thermally treated timber, an insulated structure and lighting planned for both the interior and terrace create a self-contained backyard retreat rather than a standalone sauna cabin.

Begin by mapping the technical, approval and delivery needs for the complete project. For a Canadian property, identify the province or territory and municipality responsible for the site: the National Model Codes do not by themselves create one nationwide permit rule. Ask the relevant authorities which zoning, permit, structural and service checks apply. Once the Osa 350’s position and orientation are settled, use the documentation for the selected version to coordinate the foundation, electrical connection and delivery with qualified local trades. To compare layouts and space requirements before deciding, explore the Bloomcabin sauna range.

One retreat shared by the sauna room and terrace

The Osa 350 links the sheltered sauna room directly to the outdoor area in front of it. This creates an easy routine: arrive via the terrace, enter the sauna, step outside between sessions and return to the house by a short route. As the terrace is an integral part of the sauna, avoid crowding it with belongings. Arrange furniture and movable items so the door and walkways remain clear, the glass front stays unobstructed and the outdoor lighting can work properly.

Consider the garden at different times of day when deciding on orientation. The panoramic front can highlight an attractive landscape feature, while the lit interior is also more visible from outside in the evening. Check not only the view from the sauna, but also potential sightlines from paths, windows and neighbouring areas. Screening should stand clear of the structure, avoid unnecessarily restricting air circulation and leave access for cleaning the glazing.

The Osa 350 works especially well on properties where its scale is deliberately included in the garden design. Clear paths and an uncluttered setting keep the structure from feeling cramped. Low beds or understated planting can soften the transition between terrace and garden. Fast-growing plants directly against the façade or roof, however, make cleaning, inspection and care more difficult. The location should offer privacy and convenient access without blocking the exterior sides needed for maintenance.

Materials for the sauna room, façade and terrace

The exterior cladding is made from lacquered, thermally treated softwood, while the pale timber lining in the sauna room creates a warm, calm atmosphere. These areas face different demands: outdoors, moisture, sunlight and dirt; indoors, heat, humidity, skin contact and regular sauna use. Cleaning and care should therefore suit the particular surface. Harsh all-purpose cleaners and unsuitable coatings can alter colour and surface appearance.

Thermal treatment improves the wood’s suitability for changing outdoor conditions, but it does not make it maintenance-free. Colour changes, small surface marks and natural variation in the grain are normal characteristics of wood. Inspect surfaces regularly, especially where water may remain for longer periods. How often the oiled terrace needs re-treatment depends on use and exposure. The wood must always be clean and dry before applying a suitable care product; follow the relevant manufacturer care instructions.

Insulated walls, roof and floor for regular sauna use

The Osa 350 has insulated walls, roof and floor, helping separate the heated sauna room from the outdoors. Even so, warm-up speed and temperature during use depend on the starting temperature, ventilation, how often the door is opened and operation of the heater. Insulation does not replace proper ventilation or settings suited to the installed heater. Follow the documentation for the specific sauna configuration and heater when warming up, operating and ventilating.

The EPDM roof with an overhang provides weather protection above the Osa 350. During site planning, consider where roof water will drain so it does not collect at the foundation, entrance or adjoining paths. A position beneath heavily overhanging branches increases leaf and twig debris and makes upkeep harder. Keep the roof edge accessible for future checks. The roof is not intended as a storage surface, for walking on or for occupancy.

Separate lighting for the terrace and sauna room

IP65 LED spotlights illuminate the terrace and help with orientation at the entrance after dark. They make step edges, items left out and wet patches easier to see, but they do not replace clear, safe walking routes. Lay out the approach so no one has to walk through planting beds or over uneven ground to reach the sauna. Check the effect of the lighting after dark and arrange the surroundings to limit unwanted light into living spaces or neighbouring properties.

The sauna room has dimmable LED strips behind the backrests and beneath the benches. This indirect light avoids an overpowering ceiling light and can be adjusted for different uses. Brighter lighting can be useful for entering, cleaning and tidying; a softer setting creates a calmer atmosphere during a sauna session. Use the lighting and controls only as intended. Because heat, moisture and electricity are combined, work on wiring, luminaires or controls must be carried out only by a qualified professional.

Plan the Osa 350 electrical sauna system with qualified trades

The sauna heater, digital controls and sensors form a technically coordinated system with the sauna room. Installation and set-up depend on the selected configuration. Required clearances, connection, operation and use are governed by the Osa 350 documentation and the manual for the heater actually installed. Have these documents ready before installation and arrange for the planned configuration to be professionally reviewed. Components should not be altered independently, as unauthorized changes can affect intended function, operation and proper installation.

The digital controller brings together the intended operating functions of the sauna heater. If the selected configuration includes a Wi-Fi option, its associated requirements and set-up steps must also be followed. Before first use, familiarize yourself with all displays, settings and shut-off options. Even when operating remotely, switch on the heater only after checking on site that the heater area is clear and that no towels, cleaning materials or other items are on or immediately beside hot parts.

Bring in a locally qualified electrical contractor early. The electrical plan must cover heater output for the selected configuration, cable routing, circuit protection, controls and the final connection. Ask the contractor to verify that the chosen heater and control equipment are acceptable for installation at the destination and to identify any permit, notification or inspection steps with the authority having jurisdiction. Do not treat documentation or approval for another market as proof of local acceptance. Provide the Osa 350 and heater technical documents before assembly so supply lines and connection points can be placed correctly. Extension cords and improvised connections are unsuitable for a permanently installed outdoor sauna. If damage, an unusual smell or an apparent electrical fault occurs, leave the system switched off until a qualified professional has identified the cause.

Prepare the site, foundation and unloading area before delivery

The Osa 350 requires a level, stable base aligned across its complete footprint, and the product documentation identifies a concrete slab as the ideal solution. Before construction, verify the position, finished elevation and external dimensions against the model documents. Have the foundation designer assess the site conditions, drainage, local snow and wind exposure, and the rules adopted for the property without assuming an unverified load rating. The base must support the structure without promoting distortion; loose shims or isolated point supports are not a suitable remedy for unevenness. Give the foundation contractor the model details and intended orientation.

Preparing the site also includes effective drainage for rainwater and cleaning water. The slope and adjoining surfaces must not direct water toward the building or allow it to pool against timber components. Leave enough working space around the Osa 350 so the glass front, façade, roof edge and technical areas remain accessible later. Fixed privacy screens, dense planting and heavy furniture that is difficult to move can make cleaning and maintenance unnecessarily difficult. Plan such garden elements only after the necessary clearances for assembly and upkeep have been confirmed.

Unloading requires a crane or forklift, so review the complete route from the public access road to the planned set-down area. Driveway width, turns, surface capacity, slopes, gates, branches, overhead lines and other obstacles can affect both the delivery vehicle and lifting equipment. Arrange an early site review with the delivery provider or qualified contractor, who can make the final access assessment. The vehicle and lifting areas must be reachable, large enough and capable of supporting the equipment. Bloomcabin delivers throughout Canada, including its territories and islands. Delivery is free for most products, but check the Osa 350’s specific delivery, access and unloading terms before ordering.

Install prefabricated modules professionally and complete final checks

The Osa 350 is assembled on site from prefabricated modules. Keep the entire assembly area clear, protect delivered parts from dirt and damage, and ensure all prepared connection points remain accessible. Packaging and components must not obstruct manoeuvring routes, lifting operations or work on the foundation. Follow only the product-specific assembly instructions during construction. Additional drilling, penetrations or alterations to load-bearing, insulated or weather-sealed components should be made only after professional clarification.

Before assembly, check the delivery for visible transport damage and document any issues clearly. Once installation is complete, inspect all accessible areas together. Doors should open and close without obstruction, glass surfaces should show no visible damage, and cladding, fittings and connections must be complete and neatly installed. The terrace should also be clean, clear and safe to walk on. Test technical functions only after professional connection and in accordance with the relevant instructions. Keep the documentation for the sauna, heater and controls together and readily available.

Before regular use, the interior must be fully furnished and cleaned, and all technical work completed. Before heating the sauna, take time to learn the displays and settings of the digital controls, ventilation options, lighting and shut-off functions. Also check that the door and access route can be used without obstruction. Everyone using the Osa 350 should know how to leave the sauna and stop operation at any time. Explain these basic operating points before using it together.

From preparation to drying after a sauna session

Prepare fully before beginning to heat the sauna. Benches and floor should be clean and clear, and damp textiles from the previous session removed from the interior. Keep fresh towels and drinks within reach without blocking the area around the heater. Leave wet or heavily soiled shoes on the terrace to reduce dirt and moisture entering the sauna. Set the lighting first so benches, floor and controls are easy to see. Dim it only after the room has been prepared and everything has been safely put away. Use the sauna only for as long and as intensely as feels comfortable, and leave the room if you feel unwell. When several people are present, they should look out for one another. Sauna infusions must be carried out only as described in the manual for the installed heater. Unsuitable liquids, excessive amounts or accessories left on hot parts can damage the heater and must not be used. The terrace provides an outdoor rest area immediately beside the sauna. Keep it clear of towels, footwear and other trip hazards, particularly when the surface is wet. During snowy, icy or freezing weather, manage the temperature change according to your comfort and keep the route between the house and sauna secure and weather-ready. Store a towel or bathrobe within easy reach without obstructing the door or walkway.

After the final sauna session, remove loose dirt and take all damp towels, floor coverings and other textiles out of the interior. Use the provided ventilation options so the sauna room, benches and other timber surfaces can dry completely. Damp items must not be left in the closed sauna until the next use. Once cooled down, check that the interior is dry and that no textiles or other objects have been left behind. The Osa 350 will then be clean and ready for the next sauna session.

The terrace functions as both a transition area and an outdoor surface. Remove sand, soil and leaves while dry where possible, before they settle onto the wood with moisture. Do not allow standing water to remain on the timber for extended periods. Lift movable furniture, mats and containers regularly so trapped moisture can be spotted early and the area cleaned. Items that collect water or permanently restrict air circulation are not suitable for permanent placement on the terrace.

Material-appropriate care for sauna timber and floor grates