Elegant Sauna with Terrace

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

The Bloomcabin Osa 350 is a spacious outdoor sauna measuring approximately 350 cm wide, 350 cm deep and 266 cm high. Across 12.25 m², it combines the sauna room with an integrated terrace of oiled thermowood. Panoramic glazing admits generous daylight and opens the view to the garden. Thermally treated timber, insulated construction and lighting coordinated for the interior and terrace make Osa 350 a distinct outdoor retreat. It suits anyone seeking more than a single sauna cabin and planning a garden sauna area for regular use.

Before choosing its position, assess all technical and logistical requirements. Foundations, electrical connections and delivery can only be planned reliably once the location and orientation of Osa 350 are fixed. Work from the documentation for your selected version and coordinate each preparation step early with the relevant trades. To compare alternative forms and their space requirements, explore further models in the Bloomcabin sauna range.

Sauna room and terrace as one retreat

Osa 350 connects the sheltered sauna room directly to the outdoor area in front of it. This supports an easy routine: arrive via the terrace, enter the sauna, step outside between sessions, then return to the house by a short route. As the terrace is an integral part of the sauna, avoid overcrowding it with belongings. Position furniture and movable equipment so the door and walkways remain clear, the glass front is not obscured and the exterior lighting can work effectively.

Consider the garden at different times of day when choosing the orientation. The panoramic front can emphasise an attractive landscape view, but it also makes the lit interior clearly visible from outside in the evening. Check not only the outlook from the sauna, but also possible views in from paths, windows and neighbouring areas. Screening should stand clear of the structure, avoid unnecessarily limiting airflow and retain access for cleaning the glazing.

Osa 350 is particularly effective on properties where its scale is deliberately included in the garden design. Clearly routed paths and an uncluttered setting prevent the structure from feeling cramped. Low beds or subtle planting can shape the transition between terrace and garden. Vigorous plants directly against the façade or roof, however, make cleaning, inspection and maintenance more difficult. The site should offer privacy and convenient access without concealing the exterior sides needed for upkeep.

Materials for sauna room, façade and terrace

The exterior cladding is painted, thermally treated softwood, while pale timber lining in the sauna room creates a warm, calm atmosphere. These areas face different demands: outside, moisture, sunlight and dirt act on the surfaces; inside, heat, humidity, skin contact and regular sauna use are central. Cleaning and maintenance must therefore suit each surface. Harsh all-purpose cleaners and unsuitable coatings can alter both colour and finish.

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

Insulated walls, roof and floor for regular sauna use

The walls, roof and floor of Osa 350 are insulated, effectively separating the heated sauna room from the exterior. How quickly the interior warms and how temperatures develop in use still depend on the starting temperature, ventilation, how often the door is opened and operation of the heater. Insulation therefore replaces neither correct ventilation nor settings appropriate to the installed heater. Follow the documents for the specific sauna configuration and the heater actually fitted when heating, operating and airing the sauna.

The EPDM roof with overhang provides upper weather protection for Osa 350. During site planning, consider where roof water can drain so it does not collect at the foundation, in front of the entrance or on adjacent paths. A position directly beneath heavily overhanging branches increases leaves and twigs on the roof and makes maintenance harder. Keep the roof edge accessible for later checks. The roof is not intended as a storage surface, for walking on or for occupancy.

Separate lighting for terrace and sauna room

IP65 LED spotlights illuminate the terrace and improve orientation at the entrance after dark. They help reveal step edges, stored items and wet patches, but lighting does not replace clear, safe walking routes. Arrange access so nobody has to walk through planting beds or across uneven ground to reach the sauna. Check the lighting effect after nightfall and plan the surroundings to minimise unwanted light entering living rooms or neighbouring properties.

Inside the sauna room, dimmable LED strips are fitted behind the backrests and beneath the benches. This indirect light avoids dominant ceiling illumination and can be adjusted for different uses. Brighter light may be useful for entering, cleaning and tidying; a lower setting creates a calmer mood during sauna use. Use lighting and controls only as intended. Because heat, moisture and electricity are combined, have a licensed electrical professional carry out any work on wiring, luminaires or controls.

Match electric sauna equipment professionally to Osa 350

The sauna heater, digital control and sensors form a technically coordinated system with the sauna room. Installation and setup depend on the selected configuration. Required clearances, connection, operation and use are governed by the Osa 350 product documentation and the instructions for the heater actually installed. Keep these documents available before installation and have the planned arrangement assessed by an appropriate professional. Do not alter components independently, as unauthorised changes can compromise intended function, operation and proper installation.

The digital control brings together the intended operating functions of the sauna heater. If the selected configuration includes Wi-Fi, its relevant requirements and setup steps must also be followed. Before first use, familiarise yourself with all displays, settings and shut-off options. Even when using remote controls, only switch on the heater after checking on site that the heater area is clear and that towels, cleaning items and other objects are not on or immediately beside hot parts.

Have a licensed electrical professional undertake the complete electrical plan. This includes heater output appropriate to the selected configuration, cable routing, protection, controls and proper connection. Provide the professional with the technical documents for Osa 350 and the chosen heater equipment early. Supply cables and connection points can then be prepared in the correct locations before installation and commissioning. Temporary extensions or improvised connections are unsuitable for a permanently installed outdoor sauna. If there is damage, an unusual smell or apparent electrical fault, keep the installation switched off until the cause has been professionally determined.

Prepare the site, foundation and unloading position fully

Osa 350 requires a level, stable base accurately aligned across its entire footprint. A concrete slab is an ideal solution. Before construction, compare the location, finished level and external dimensions with the product documentation. The base must support the structure permanently and must not encourage distortion. Unevenness cannot sensibly be corrected with loose packers or support at isolated points. If arranging the foundation through a contractor, provide the model details and planned orientation.

Preparing the site also includes effective drainage for rainwater and cleaning water. Falls and adjacent surfaces must not direct water towards the building or allow it to pool against timber components. Leave sufficient working room around Osa 350 so the glass front, façade, roof edge and technical areas remain accessible later. Fixed privacy screens, dense planting and difficult-to-move furniture can make cleaning and maintenance unnecessarily difficult. Plan such garden elements only once the required clearances for installation and upkeep are confirmed.

A crane or forklift is required for unloading. Check the entire route from the public access point to the intended unloading position. Entrance width, bends, ground bearing capacity, slopes, gates, branches, overhead lines and other obstructions can affect delivery vehicles and lifting equipment. Coordinate delivery early with the relevant delivery provider or trade professional, who will make the final assessment on site. Space for the vehicle and lifting equipment must also be suitable and reachable; an apparently clear area is not automatically sufficiently strong or large.

Install prefabricated modules correctly and complete final checks

Osa 350 is assembled on site from prefabricated modules. Keep the whole installation area clear, protect delivered parts from dirt and damage, and ensure all prepared connection points can be reached. Packaging and components must not obstruct manoeuvring routes, lifting operations or work on the foundation. During assembly, only the product-specific installation instructions apply. Extra drilling, penetrations or changes to load-bearing, insulated or weather-sealed components should only be made after professional clarification.

Before assembly, inspect the delivery for visible transport damage and record any findings clearly. Once installation is complete, inspect all accessible areas together. Doors must open and close freely, glass surfaces must 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 sauna, heater and control documentation together in an accessible place afterwards.

Before regular use begins, the interior must be fully fitted out and cleaned, and all technical work completed. Before heating the sauna, take time to become familiar with the displays and settings of the digital control, ventilation options, lighting and shut-off functions. Also confirm that the door and access route can be used without obstruction. Everyone using Osa 350 should know how to leave the sauna and stop operation at any time. Explain these basic operating points before shared use.

From preparation to drying after sauna use

Prepare the sauna session fully before beginning to heat it. Benches and floor should be clean and clear; remove damp textiles from the previous use from the interior. Keep fresh towels and drinks within easy reach without obstructing the heater area. Leave wet or heavily soiled shoes on the terrace to limit dirt and moisture entering the sauna. First set lighting so benches, floor and controls are clearly visible. Dim the light only once the interior is prepared and everything has been put away safely. Use the sauna only for as long and at an intensity that feels comfortable, and leave if you feel unwell. When several people are present, they should watch out for one another. Apply water or any other sauna liquid only as described in the installed heater’s instructions. Unsuitable liquids, excessive quantities, or accessories placed on hot components can damage the heater and must not be used. Between sauna sessions, the terrace provides an immediately accessible outdoor space. Especially when wet, keep its surface free from towels, shoes and other trip hazards. In winter or at low outdoor temperatures, make temperature changes thoughtfully and according to your own wellbeing. As the terrace is open, a weather-appropriate access route is important. Keep a towel or robe ready without blocking the walkway or door.

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

The terrace serves both as a transition zone and an outdoor surface. Remove sand, soil and leaves while dry where possible, before they settle on 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 identified early and the area cleaned. Items that collect water or permanently obstruct airflow are unsuitable for permanent placement on the terrace.

Care for sauna timber and floor grates properly