Glass in a sauna brings light, views and a sense of space, but glass holds heat less well than timber. That is why most saunas use glass for the door and one or two windows, rather than whole walls. Always use tempered safety glass, ideally 8 mm thick, set in a timber frame with room to expand. Double-glazed windows lose less heat and fog less.
Below we cover the main glass layouts with real examples, the right type and thickness of glass, installing it, and keeping it clean.
While some saunas feature extensive glass, finding the right balance is key to maintaining both insulation and privacy.
A sauna with plenty of glass gives you the heat of a traditional sauna, with views and natural light as a bonus. Whether you're setting up a wellness space at home or upgrading a commercial sauna, glass saunas are a game-changer.
Just take a look at this awe-inspiring sauna from Shym Saunas for example:
At Shym Saunas, we believe that saunas are more than just a place to relax, they're about creating moments of connection, comfort, and well-being. Each of our saunas is thoughtfully crafted with sustainability and luxury in mind, giving you not only a beautiful space but also an experience that nurtures both body and soul.
Let’s explore how choosing the right glass sauna can transform your wellness routine.
Key Takeaways
- Glass saunas provide a sleek and modern design that enhances relaxation with panoramic views.
- Using tempered glass is essential for maintaining safety, heat retention, and durability in a sauna.
- Saunas with glass walls offer an open, spacious feeling, improved visibility, and enhanced natural light.
- Glass loses more heat than timber, so balance the view against warmth. Double glazing helps.
Why Choose a Glass Sauna?
1. Modern and Sleek Design
A glass sauna offers a contemporary, minimalist look that fits perfectly into any setting. While wood saunas give off a cosy, rustic vibe, glass saunas are all about elegance and sophistication.
Whether you want to place it indoors or outdoors, the clean lines and transparent surfaces blend seamlessly into your environment. It’s an Insta-worthy upgrade for any wellness space.
2. Improved Visibility and Openness
Unlike traditional saunas that feel closed off, a sauna with glass walls lets you connect with your surroundings. Imagine enjoying the warmth while looking out over a beautiful garden or a peaceful landscape. The openness created by glass walls reduces any feelings of claustrophobia, making your sauna experience more relaxing.
3. Space Amplification and Aesthetics
Living in a small space? No worries. A sauna with glass windows can make even the smallest rooms feel larger. The transparent walls create an illusion of a bigger, airier space. This is especially handy in apartments or homes where space is limited.
Sizes and Shapes of Glass for Saunas
When choosing a glass sauna, the size and shape of the glass play a significant role in defining your overall sauna experience. Whether you're aiming for a more open, spacious feel or prefer a cosy retreat with smaller windows, the right glass design will enhance both the functionality and aesthetics of your sauna.
1. Small Glass Door Saunas
If you're looking for something compact but still want to enjoy the openness that glass provides, a sauna with a small glass door is ideal. It offers just enough visibility while maintaining a sense of privacy.
For instance, the Panoramic Glass Sauna features a small glass door that gives you a peek into your surroundings while keeping the design intimate and traditional.
Similarly, the Cedar Barrel Sauna has a small glass insert in the door, allowing light in while maintaining a rustic look.
2. Full Glass Door Saunas
For those who love a more immersive experience, a full glass door sauna provides maximum visibility. It allows you to fully enjoy the natural beauty around you as you relax in the warmth.
Our Carbonised Spruce Barrel Sauna and Spruce Barrel UNITY EURO Sauna are great examples of full-glass door saunas. These designs bring an expansive view, perfect for open spaces like gardens or lakeside retreats.
The Round Cube Double Euro offers a luxurious experience with its sleek full glass door, making the sauna feel spacious and connected to its surroundings.
3. Large Glass Panels for Privacy and Openness
If you're seeking a balance between openness and privacy, saunas with large glass panels, rather than full glass doors, are the perfect option. These designs offer ample natural light and a feeling of spaciousness, while still maintaining a more intimate and enclosed environment.
The Patio S Sauna beautifully exemplifies this balance. Its large glass windows (690x1860mm, 8mm tempered double-glazed) provide a stunning view of your surroundings without fully exposing the interior, making it ideal for those who want a little more privacy while enjoying their sauna experience.
4. Panoramic Glass Sauna
For a unique and striking design, consider saunas with panoramic glass at the back and a smaller glass door at the front. This layout provides a breathtaking, open view from behind while preserving a sense of privacy and separation at the entrance.
Our Panoramic Glass Saunas feature this stunning combination. The curved panoramic wall at the back, made of clear acrylic on our barrel saunas, opens the whole end of the sauna to the view.
5. Fully Glass Saunas
A fully glass sauna offers a striking, modern look and an immersive experience with expansive views of the surroundings. However, using only glass comes with drawbacks, such as compromised insulation and reduced privacy.
Glass may not retain heat as effectively as timber, and a transparent design means less seclusion, which might not suit everyone’s comfort preferences.
Types of Glass for Saunas
1. Tempered Glass vs. Laminated Glass: What’s the Best Option?
Sauna glass has to cope with high heat and fast temperature changes without cracking. That is why sauna doors and windows use tempered (toughened) glass, which is around four times stronger than ordinary glass and breaks into small, blunt pieces if it ever does break. Our sauna doors all use tempered glass.
Tempered glass is specifically designed to handle thermal stress, making it the safest option for your sauna.
While tempered glass is the top choice for saunas due to its strength and heat resistance, laminated glass can also be used.
Laminated glass consists of two glass panes bonded together, with an internal layer that blocks UV rays. However, it’s not as heat-resistant as tempered glass, making it a less ideal option for saunas.
2. Sauna Glass Thickness and Heat Resistance
Thicker glass, like the 8mm used in many high-end saunas, not only improves insulation but also helps to retain heat more effectively. This allows for a more consistent and comfortable temperature inside the sauna, enhancing the overall experience while reducing heat loss.
The Importance of Choosing the Right Type of Glass
Avoiding Condensation and Mold Growth with the Right Glass
Choosing the right glass for your sauna isn't just about heat resistance, it's also about maintaining a healthy, moisture-free environment. Saunas create high levels of humidity, which can lead to condensation buildup on the glass. If the wrong type of glass is used, moisture can accumulate, potentially leading to mould and mildew growth over time.
Tempered double-glazed glass, such as that used in the Round Cube Single Sauna, is specifically designed to resist condensation. This is particularly important in colder climates, where condensation can freeze and cause cracks in regular glass. The right sauna glass helps to keep moisture at bay, ensuring that the environment remains clean and healthy, while preventing any long-term damage to the structure.
Comfort Benefits of a Glass Sauna
1. Light and Space
Daylight through a glass door or window makes a sauna feel bigger and less closed in, which many people, especially first-timers, find more relaxing.
2. A View to Relax To
Looking out at a garden, the trees or the water while you sit in the heat is calming. For many people it is the best part of an outdoor sauna.
3. The Trade-Off: Heat
Glass lets more heat escape than solid timber, so a sauna with lots of glass takes a little longer to heat and needs a heater sized for it. Double-glazed units, like those on the Round Cube and Patio saunas, lose less heat than single panes. When you size a heater, many makers ask you to add extra volume for every square metre of glass, so check the heater's guide.
How to Properly Install Sauna Glass Walls & Door
1. Sealing the Glass with Silicone
Ensure that the glass is securely sealed to prevent moisture from penetrating. A high-quality, heat-resistant silicone sealant should be applied along all edges of the glass. This not only protects the sauna from water damage but also prevents condensation from building up inside the glass. For instance, double-glazed mirror windows are often sealed with silicone to maintain their thermal efficiency and prevent moisture-related issues, especially in humid environments like saunas.
2. Framing the Glass with Durable Materials
When framing the glass, it’s crucial to use materials that can handle both the heat and moisture. Cedar is often the preferred choice due to its natural resistance to warping and its ability to withstand the sauna’s temperature fluctuations.
For example, in designs like the Panoramic Sauna, the glass panels are framed using cedar, which not only enhances the durability but also complements the sleek, modern look of the glass walls.
3. Ensuring Proper Alignment and Fit
Glass used in saunas, such as tempered glass, must be cut and installed with exact measurements. The glass should typically be about 3 to 6 mm smaller than the opening, allowing room for the frame to secure it tightly. This ensures that the glass is neither too loose nor too tight, which can cause stress and potential breakage over time.
4. Accounting for Thermal Expansion
When installing glass in a sauna, it’s important to account for thermal expansion, especially in high-temperature environments. As the sauna heats up, the materials expand slightly, so it’s important to leave a small gap around the edges, filled with silicone or another flexible material, to accommodate these changes.
5. Maintaining Ventilation
Good ventilation is also key during installation. Some saunas, like the Patio XXS Sauna, integrate large glass windows while ensuring proper airflow. Installing the glass in a way that does not block ventilation pathways helps maintain the balance between heat retention and air circulation, creating a comfortable environment while avoiding excess humidity buildup.
Easy Maintenance Tips to Keep Your Sauna Glass Spotless
To keep your sauna glass looking pristine, clean it regularly with a soft cloth and mild soap. Avoid harsh chemicals that could damage the glass surface. After each use, wipe down the glass to remove condensation and sweat, ensuring it stays clear and free from streaks or smudges.
Buying a Glass Sauna Door
Building your own sauna? Our sauna doors come in Canadian hemlock or Western Red Cedar frames with tempered clear or bronze glass. The 2000 x 780 mm doors cost $1,100 (hemlock) and $1,330 (cedar) at regular prices at the time of writing (October 2026).
5% OffHemlock Sauna Door 2000 x 780In stock$1,045
5% OffCedar Sauna Door 2000 x 780In stock$1,330Common FAQs
Will the Glass in My Sauna Break?
No, as long as you use tempered glass, it’s highly unlikely to break under normal sauna conditions. Tempered glass is designed to handle sudden temperature changes and impact.
How Thick Should My Sauna Glass Be?
Typically, sauna glass should be around 8mm thick. This provides the perfect balance of strength, insulation, and safety.
What is the Best Glass Type for My Sauna?
For most saunas, tempered glass is the best option. It’s durable, heat-resistant, and offers the transparency needed to enjoy the view outside without compromising safety.
Why do saunas use glass doors and panels?
Glass adds natural light and a sense of openness. Most saunas keep it to the door and a window or two, so they still hold their heat.
Does a glass sauna door affect heat retention?
A glass door lets out a little more heat than a solid timber one, but a well-sealed 8 mm tempered door makes little difference to most saunas.
Is tempered glass required for sauna doors?
Yes, tempered glass is standard for sauna doors due to its strength and safety under high heat.
Does a panoramic glass sauna cost more than a standard one?
Yes, panoramic glass models typically cost more due to the additional glass and reinforced framing required.
Do glass sauna doors need special maintenance?
Just regular cleaning with a suitable glass cleaner is usually enough to keep them looking clear.
Can glass sauna panels crack from high heat?
Tempered glass is built to withstand sauna temperatures safely, making cracking from heat alone unlikely.
Does a glass front make a sauna feel more spacious?
Yes, glass fronts create a brighter, more open feel, especially in compact sauna designs.
What's the benefit of natural light in a sauna design?
Natural light can make sessions feel more relaxing and less enclosed, especially for those new to saunas.
Are glass sauna doors safe for family use?
Yes, tempered glass is designed to be shatter-resistant and safe for household use.
How do you clean glass sauna doors properly?
Use a mild, non-abrasive glass cleaner and soft cloth, avoiding harsh chemicals that could damage seals.
Wrapping Up
Used well, glass makes a sauna brighter, more open and more beautiful to sit in. Keep it to tempered glass, frame it properly, and balance the view against the heat.
One of the great advantages of choosing Shym Saunas' prefabricated sauna kits is how easy they are to install, even for DIY enthusiasts. These kits come with preassembled components and log assembly technology, allowing you to set up the sauna without needing specialised tools or experience. The glass panels, doors, and windows are designed for easy integration, making the process both quick and hassle-free.
