Sauna Door Guide: Glass vs Wood, Sizing, and Safety

The door is one of the most overlooked parts of a sauna, yet it shapes how well the room holds heat, how safe it is to use, and how the whole cabin looks. This guide covers the two things buyers ask about most, glass versus wood and the right size, plus the safety details that matter once the room is hot.

The short answer

Sauna doors come in two main styles: solid wood, usually cedar, and tempered safety glass, often framed in wood or aluminum. Wood insulates a little better and gives a classic, enclosed feel, while glass makes a small room feel larger and lets light in. Both work well in a home sauna when the frame is sealed and weatherstripped. Every sauna glass door uses tempered safety glass, not ordinary glass, so it resists heat and breaks safely if it ever fails. The most common door size is 24 inches wide by 72 inches tall, kept narrow on purpose to hold heat, with wider 26 and 28 inch options for accessibility. For safety, a sauna door should swing outward and never lock, so anyone inside can always push it open.

Glass versus wood sauna doors

Wood is a natural insulator, so a solid cedar door resists heat transfer slightly better than glass and suits traditional, high-temperature Finnish rooms. It also blocks the view in and out, which some owners prefer. A tempered glass door, framed in wood or a thermally broken metal frame, performs comparably in most residential saunas when it has good weatherstripping. Glass opens up a compact room visually and is popular in modern indoor infrared cabins. There is no wrong answer here; it is a comfort and design choice more than a performance one. If you are still choosing a cabin, compare styles in our traditional saunas and infrared saunas collections, where door type is listed with each model.

Why sauna glass is always tempered safety glass

Any glass in a sauna door is tempered, meaning it is heat-treated to be roughly four times stronger than standard annealed glass. Just as important, if tempered glass ever breaks it shatters into small rounded pieces instead of long sharp shards. Most quality sauna doors use 8 to 10 millimeter tempered glass rated well above the 180 to 200 degree range of a hot Finnish sauna. Doors are one of the products covered by the federal safety glazing standard, 16 CFR Part 1201, which requires glazing in doors to break safely. When you shop, confirm the door is labeled tempered or safety glazing; never accept a sauna door with plain window glass.

Standard sauna door sizes

Sauna doors are intentionally smaller than a normal interior door because a shorter, narrower opening loses less heat every time you enter.

• Width: 24 inches is standard, with 26 and 28 inch options for larger users or accessibility.
• Height: 72 inches is typical, sometimes with a raised threshold that further slows heat loss.
• Thickness: wood doors are usually built to match the wall panel, and glass is commonly 8 to 10 millimeters.

Measure your rough opening before ordering, and remember that a pre-built cabin already includes a correctly sized door. Kits let you pick the door separately. For sizing the whole room, our sauna sizing guide helps match capacity to your space.

Swing direction and safety

A sauna door must open outward and use a simple ball-catch or roller latch, never a lock or a latch that can trap someone. Outward swing means a person can always push the door open, even if they feel faint. Good doors also self-close gently so the room holds temperature between entries. Check that hinges are corrosion resistant and that the handle on the inside is wood or another low-conducting material so it stays cool to the touch.

How to choose

Pick wood if you want maximum heat retention and a private, cabin feel. Pick glass if you want a compact room to feel open and bright. In both cases, insist on tempered glass where glass is used, a 24 inch or wider opening that fits your space, an outward swing, and no lock. Those four points cover comfort and safety for nearly every home sauna.

Frequently asked questions

Is a glass or wood sauna door better? Both work well. Wood insulates slightly better and feels enclosed, while glass makes a small room feel larger and brighter. It is mostly a design preference in a home sauna.

What kind of glass is used in a sauna door? Always tempered safety glass, usually 8 to 10 millimeters thick, which resists sauna heat and breaks into small rounded pieces rather than sharp shards.

What size is a standard sauna door? The most common size is 24 inches wide by 72 inches tall, kept narrow to retain heat, with 26 and 28 inch widths available for accessibility.

Ready to compare cabins with the door style you want? Browse our traditional saunas for sale and infrared saunas, both listed with door type and glass details. Every sauna ships with free US shipping, an authorized-retailer warranty, and real human support. Questions about a specific door or opening size? Reach our team through the contact page.