Sauna Doors: Everything You Need to Know

Updated January 2025 — Backyard Sauna Pro

A sauna door is not a standard interior door. The heat and humidity destroy regular wood doors within a season. The hardware gets hot enough to burn. And outward swing is not optional — it is a safety requirement. Here is what to know before you buy or replace a sauna door.

Safety First: The Door Must Open Outward

This is non-negotiable. If a person loses consciousness inside the sauna, an outward-opening door lets someone outside rescue them. An inward-opening door can be blocked by an incapacitated person and is a documented cause of sauna fatalities. Every sauna manufacturer and most building codes require outward swing. No exceptions.

Door Materials

Cedar and hemlock

The standard. Both handle heat-moisture cycles without warping, don't release resins at sauna temperatures, and age well. Most kit saunas include a cedar or hemlock door. If replacing a door, match the wood to your interior cladding for consistency.

Glass panel doors

Tempered glass in a wood frame is the most popular upgrade for home saunas. The glass must be tempered — never standard float glass, which can shatter. Full-glass doors make a small sauna feel larger, let in natural light, and look clean. The downside is slightly more heat loss through the glass panel compared to a solid wood door.

What to avoid

Pine doors warp and weep sap. Standard interior hollow-core doors fail quickly. Any door with metal hardware on the interior face will become too hot to touch. Vinyl weatherstripping degrades in sustained heat — use silicone or leave it off and rely on the door's fit.

Standard Sauna Door Sizes

Most residential sauna doors are 24 inches wide. The narrow width is intentional — less opening means less heat escapes when entering and exiting. Height is typically 72 or 80 inches (6 or 6.67 feet).

Barrel saunas often have smaller doors — some as narrow as 22 inches. Measure your rough opening before ordering a replacement. Height clearance matters too; some barrel sauna entry points have lower openings than a standard door height.

Hardware Requirements

Use no metal on the interior-facing side of the door. The handle, hinges, and any latch must be wood, ceramic, or recessed so there is nothing metal projecting inside the sauna. A wood pull-bar on the interior face is standard. The exterior can use standard stainless steel hardware.

The door needs a magnetic or wood latch that can be operated from both sides. A door that cannot be opened from the outside is a safety hazard.

Buying a Replacement Sauna Door

Sauna specialty retailers stock replacement doors in standard sizes. Measure width, height, and door thickness before ordering. Most kit saunas use 1.5-inch thick doors. If the rough opening is an odd size, contact the original manufacturer — Almost Heaven and Dundalk both sell replacement doors for their kits and can advise on compatible sizes.

FAQ