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outdoor sauna design
garden sauna design modern flat roof
outdoor sauna design


The modern outdoor garden sauna with flat roof

A perfect place full of strength and tranquility to bring body and mind in harmony. An oasis of well-being and relaxation with the scent of forest and wood. A space where minimalism becomes pure luxury. 

With the KOYA garden sauna, we have succeeded in stylishly combining the perfect design of a modern outdoor sauna with the highest demands on quality in one product. 

The shape of the outdoor sauna house was chosen by the architects and product developers to be angular and cubistic on the one hand, but soft and pleasing on the other.

The high design claim is particularly emphasized by the fact that the garden sauna cube is a flush unit from the outside and the facade details are cleverly solved. 

KOYA design outdoor sa una is available in several sizes. The side walls of the outdoor sauna can be made either in transparent glass or opaque wall elements. The upper finish of the garden sauna is formed by a flat roof, which drains internally.

Colors and materials of the exterior facade are customizable to your needs, so that each sauna house becomes an unmistakable unique specimen. Especially metals like aluminum or stainless steel are used for the cladding.

For the interior of the KOYA Sauna Cube, we used the highest quality wood processing from Hemlock fir wood for wall and ceiling cladding and Abachi wood for the benches. The system is equipped with a unique design sauna heater with appropriate heating power, depending on the requirements and volume of the room.


Modern KOYA garden sauna is 100% made in Germany and transported to you whole after completion. The outdoor sauna can be installed on surfaces in the garden, on terraces or patios, on all gravel, stone or wooden surfaces. So that you can enjoy your sauna dream immediately, the assembly is done with a truck-mounted crane - fast and uncomplicated!

Immerse yourself in the KOYA sauna world!









Such is the quality of construction of the KOYA garden sauna

Choose the right KOYA Outdoor sauna

A garden sauna fulfills versatile needs. Is it used more as a solitary retreat to escape from everyday life and recharge your batteries, or does the outdoor sauna form the center of community with friends and family. To meet the different requirements for use and space, the sauna cube is available in several sizes. 

Your personal design outdoor sauna can be made square as a pure sauna house with entrance door, windows, fixed glazing or corner glazing. For more space, the garden sauna can also be made as a rectangular module with an anteroom that is used, for example, as a changing room or rest area.


Our team will be happy to advise you in detail which sauna size is particularly suitable and feasible for you.

from 35.900,-


The KOYA sauna house is available in a square shape in sizes

2,5 x2,5m as well as in 3x3m available.

from 59.000,-


In rectangular shape, the outdoor sauna can be made in 2.5 x 5.0m and 3.0 x 6.0m.

on request


No sauna size fits your sauna project? We are happy to produce special sizes for you at capacity.









Create the look of your design sauna house

The design of the facade of a modern sauna house has a strong influence on the external perception of the building, but also on the well-being of the interior. Do you prefer an open, transparent garden sauna that allows insights and views or do you prefer a protected place where you can be just for yourself? 


A carefully selected assortment of panoramic windows, doors and non-transparent walls allows KOYA sauna modules to be customized to meet your individual requirements and wishes. 

Particularly noteworthy is the exclusive design of the sauna facades. Here, our product designers and architects have developed a system that is completely flush with the outside of the metal facade of the sauna cube.

In detail, this means that the frames of the window or door elements are completely covered by glass and open to the outside, so as not to lose space inside. The wall elements of the garden sauna are also 100% flush with the outer skin. This makes the object look very uniform and perfect. In the outdoor sauna sector, this innovative solution is absolutely unique and will draw the eye.

The opaque wall elements of the sauna are made of 50-70mm solid wood, which are clad on the outside with a metal facade of aluminum or stainless steel to create the modern look. For good insulation, the windows and doors are equipped with double or triple glazing. Thus, the energy loss in the outdoor sauna even in the cold seasons heating is low and the temperature in the room can be kept constant.

exterior sauna windows


For the design of the sauna house we offer window elements in different sizes. (2-fold and 3-fold glazing possible on request). 

outdoor sauna light band

Lighting strip

A garden sauna with a light band has the advantage that enough light and brightness streams the interior, without giving private views of the structure.

exterior sauna door


A KOYA Garden sauna is available with transparent glass door or a door with external metal panel. (Multiple glazing possible!)

outdoor sauna wall


To close the sides of the Sauna Cube, we use high-quality solid wood wall elements made of hemlock, which are covered with metal from the outside.

exterior sauna panorama window

Panorama window

With a large panoramic window, you connect the interior of the sauna with the exterior, becoming a part of the surroundings and nature. (in 2-fold & 3-fold glass version)


Custom facade

Do you have special requirements for your outdoor sauna facade? You want e.g. wood or stone optics? we discuss your ideas with you.






Choose a roof structure for your modern garden sauna

Even though the KOYA garden sauna is already an absolute eye-catcher with a flat roof - in the standard version - there are still possibilities to further enhance the spatial experience inside the sauna cube.


By installing roof windows with round or angular shapes, additional daylight can stream into the sauna room through the ceiling during the darker seasons. This makes the room look bright and friendly even in shady locations.

In addition, it is a very special spectacle to lie in the sauna and watch the sky and let the clouds pass by. A view into the distance that gives inner peace and strength.

At night, the picture is even more beautiful for the sauna user and you can even look at the starry sky during your sauna session. An unforgettable experience that fills the room with excitement and energy.

outdoor sauna skylight corner

Roof window angular

With a square or rectangular roof window, the design language of the KOYA sauna house is ideally supported.

outdoor sauna skylight round

Skylight round

Round skylights give the outdoor sauna a modern and playful character. Enjoy the starry sky at night!



Of course, special solutions are also possible for the roof design. Panoramic roof / pent roof on request. (only with production capacity)








The KOYA Design-Design sauna house freely

You want to give special atmosphere to the interior of your garden sauna in a certain style?


Do you already have an idea of how the seating and lounging areas of your sauna house should be arranged so that you can relax alone or with friends and family to the maximum?


The right choice of materials used for the floor, ceiling, walls and sauna benches can create special moods.

Do you want to depict more of a modern interior for your sauna house or do you prefer a traditional chalet or cabin character?


Do you want the interior of your outdoor sauna to be characterized by light, fresh-looking woods or by dark, elegant wood?

To help you create your own personal sauna room, we offer a carefully selected range of floor coverings, wall and ceiling coverings made of the highest quality natural materials.


Only the best woods from abachi, hemlock and spruce are used for the interior of the KOYA outdoor sauna.

In sauna wood is particularly important that the material is uniform, resistant and stable. In addition, the aforementioned sauna woods have low thermal conductivity and create a pleasant atmosphere due to their warm colors.

Only renewable wood species from sustainable forestry, preferably from regions such as Europe and Canada, are used for the construction of your garden sauna. Tropical woods are not used for reasons of nature conservation.



Wooden floor

The sauna floor can be covered with floor coverings made of robust and resistant sauna woods.




With a tiled floor made of ceramic tiles, your sauna is easy to clean. The tiles are available in different colors.



Natural stone

probably the most high-quality flooring solution are textured natural stone tiles in different types of stone.




Since a KOYA Design sauna meets special requirements, can also receive special floors, such as mosaic.


Wall / Ceiling



The KOYA Sauna wall with horizontal slats gives the interior a modern look. Woods in hemlock, abachi, spruce, ash, pine, etc..



By using milled small or large grids, you create a modern wood tile look. (Woods as for the lamella optics).


Waste wood

For the KOYA Garden sauna you can also get textured reclaimed wood walls and ceilings made of brushed or flamed precious woods.



Do you have special ideas about how your sauna interior walls should be lined? We will find the desired solution!



Bench straight

Like the sauna walls, the sauna ceiling can also be equipped with different woods and decorated with horizontal lines.


Corner bench

When the gridded pattern is continued from the sauna walls to the ceiling, the result is a uniform, modern overall appearance.



A ceiling in reclaimed wood provides a cozy warm chalet charaker. Choose from different treated woods and looks.



You have not found what you are looking for in our interior range? Surely there is a solution for your needs. Talk to us about your idea.







The outdoor sauna Cube is available in special material

The design of the KOYA outdoor sauna aims to attract special attention of its viewers with clean lines and uniform shapes. 


The external appearance of the garden sauna cube is influenced in particular by the choice of facades and materials.

In construction, the outer skin of the sauna house consists of a shapely, metallic cladding, which can be executed individually. Here, for example, it is possible to obtain metals such as aluminum or stainless steel with surface treatments in brushed, satin or glossy appearance. In addition, the colors of the sauna cladding can be determined within a color range. 


Special effects can be achieved if the entire sauna house is made in chrome or mirror look. Imagine how discreetly a building blends into nature when the surroundings are largely reflected in the facade.

Talk to us about your ideas!



With a smooth surface lacquer finish, you can give your sauna cube an elegant shine and exciting reflections in many colors.




Silk matt lacquers soften reflections in the sauna surface and create a balanced image.


outdoor sauna-metal-stainless-steel-glazing


With a chrome finish, nature blends into the environment of the sauna house by reflection. (request only)

garden sauna stainless steel brushed

Stainless steel

An outdoor sauna with stainless steel cladding is particularly high quality and durable, both visually and technically. (only on request)







Valuable accessories for the modern garden sauna

The KOYA garden sauna lives not only from its extravagant design but also from its extraordinary functions and technically sophisticated detailed solutions. When equipping the outdoor sauna, special emphasis is placed on the quality of the installed accessories during production. 

Using an EOS Mythos sauna heater, for example, the cubist design language of the sauna house is taken up and this is thus also reflected in the interior. 


A high-quality sauna is designed for absolute relaxation and must therefore be easy and stress-free to operate. With a high-end sauna control system, we guarantee you the highest reliability and comfort. For optimal scheduling of your sauna session, access is also possible remotely via an app control.

In addition to a sauna heater, the garden sauna can also be equipped with infrared heaters. Infrared heat penetrates deep into the skin and muscles, having a particularly relaxing effect on the body.

If you choose a modern sauna with infrared radiators, you will get systems integrated flush into the sauna walls. 

For the KOYA relaxation experience to be perfect, all senses should be stimulated as much as possible. For this reason, we offer you a specially developed lighting concept with warm white or colored light. We only use indirect lighting as this creates a special experience with atmosphere.

With the help of integrated speakers, for example, relaxation music can be played via Bluetooth from a mobile device. This creates a special atmosphere in the interior and helps you to let go of the last tension!


Since perfection is in the details, you will also receive valuable design accessories for your KOYA garden sauna, such as climate meter, sauna thermometer, hourglass, matching wooden bucket with ladle, high-quality head and neck rests and much more. Discover the wide range of possibilities!


Sauna heater

The EOS sauna heater Mythos impresses with its design and is available in different heating capacities depending on the room size. (from 7.5 to 15 KW)



The KOYA lighting package allows you to create any mood in the room with color or warm white tones.


Infrared radiator

In addition to the sauna function, we install additional infrared radiators to generate soothing deep heat and muscle relaxation. (300 - 750 watts per radiator)



Speakers integrated into the wall and ceiling can be controlled via Bluetooth using a mobile device and provide sounds of relaxation.



By using a professionally installed

sauna control, we guarantee the highest comfort in operability. (also possible via app control)



Of course, you can also get accessories for your sauna that match the design, such as bucket with ladle, neck rests, clothes rack, hooks and much more.


Measuring devices

With the help of measuring devices such as a thermometer

or an hourglass, you are always informed about the current temperature, climate and length of stay in your sauna. 



You would like to equip your sauna with a special heater or other products? We will find the best solution together!


The advantages of the KOYA garden sauna








Why we are the best choice for your outdoor sauna

✓unique design
✓ individual sizes
✓ serious advice
✓ high-quality materials
✓ Modular
✓ No setup necessary
✓ highest quality
✓ Made in Germany
✓ individual design
✓ 3D visualization
✓ Planning services
✓ Plug & Play





  • Do I need a building permit for a garden shed office?
    A building permit is not mandatory. Essentially, the local regulations must be observed. These vary greatly from state to state. We are happy to support you with our planning office in obtaining the building permit. Contact us! We will find a solution.
  • How much does a KOYA garden shed office cost?
    The prices for a KOYA home office vary depending on the desired size, facade design and the wide range of accessories. In our detailed price list with pictures and explanations you will get exact information about our exclusive products. Contact our customer service and inquire directly here!
  • Is there any assistance in scheduling a garden shed office?
    If you are not sure how and where to place your garden cube home office, you can always contact our planning team. Our placement department will be happy to assist you with the correct placement of your garden cube and clarify with you all requirements regarding the ground, fastening, etc. Also a visualization on the basis of a photo or a 3D representation can be very helpful for a better idea of the project. We support you where we can! just contact us here
  • Can I customize KOYA Office?
    Yes, you can design and configure your own personal Office Garden House within our range. If you do not find what you are looking for in our program, we can discuss your individual wishes together with our special department: These could be: -Special areas of use or requirements -Commercial use -Special sizes outside the KOYA program -Addition of several modules -Individual planning and visualization -Special facade and opening elements -Special colors or materials Together we will find the right solution for your needs.
  • How is the KOYA Garden Office built?
    KOYA Office Cubes are "Plug & Play" and are completely prefabricated in production. The finished modules are delivered as a whole via freight forwarding. For the assembly, only a truck-mounted crane is needed to place the garden house home offices in the desired location. The assembly and placement of the modules is supervised by a KOYA assembly team upon request.
  • How to make the foundation for a KOYA Garden House Office?
    KOYA should ideally be firmly connected to the ground. The best way to fix the module is to use small concrete bases at the corners of the KOYA. For this purpose, the room module has provided small adjustable feet with holes. Alternatively, prefabricated concrete slabs or a concrete floor can be used as a base. You will receive from us detailed instructions for the execution of the foundations. The dimensions of the foundations strongly depend on the size of the ordered room module and therefore vary for the different models. In order to save costs, the foundations are ideally implemented by a GALA construction company (gardening and landscaping) in your vicinity. After delivery, the adjustable feet are then connected to the foundation by means of concrete anchors.
  • How is the power connection made?
    The Office Cube requires a 230V connection. The connection is laid by an electrician with an underground cable to the desired installation site. The cable for the power connection is located on delivery, open, on the underside of the garden house. For legal reasons, the connection of the connection or the connection to the power source may only be made by a certified electrician. Upon delivery of your garden home office, the electrician will establish the power supply with a waterproof plug. Then your Office Cube is fully ready for use.
  • How is the Office KOYA transported?
    The transport of your individual garden office is carried out by a forwarding company we trust. KOYA is prefabricated in the factory and delivered fully assembled. Complete transport of the finished product means less stress for you on site with a tedious assembly, which is usually necessary with other manufacturers and takes a lot of time in addition to the cost.
  • What are the delivery times for a KOYA Office Cube
    KOYA is a product that is manufactured individually for you according to your wishes. The current delivery times are seasonal and will be communicated to you in writing together with our offer. You can usually get a first estimate already in a conversation with our sales team.
  • Is a garden shed office tax deductible?
    In principle, a garden office is easier to deduct for tax purposes than a home office in a private household, as the question of use never arises with an external home office. In the case of a garden office, all costs from the purchase to the maintenance and the operating costs can normally be claimed against tax. Annoying questions of the tax office regarding the exclusive use or the actual working time spent in the office are completely eliminated. What to consider when using a Gratenoffice for tax deductions: -The garden shed office should be detached if possible and not connected to the house. -Use exclusively as a home office - No garden shed, no garden tools, etc. -The year-round usability by means of thermal insulation should be given. - The equipment of the garden office should correspond to a Arbeitsplat, at which can be worked all year round.

Plan your garden and sauna house with us now 

Consulting +49 (0) 81053987505
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