Sauna Windows | Dual-Pane Tempered Sauna Glass

Sauna window sizes and rough openings

Sauna window sizes, viewable area, rough openings and glass
Glass size	Viewable area	Rough opening	Glass
16″ × 30″	14-1/2″ × 28-1/2″	17-7/8″ × 31-7/8″	Clear or gray-tinted
16″ × 60″	14-1/2″ × 58-1/2″	17-7/8″ × 61-7/8″	Clear
24″ × 36″	22-1/2″ × 34-1/2″	25-7/8″ × 37-7/8″	Clear

The size is the glass; frame the wall to the rough opening. The 16″ × 60″ is a long, narrow sidelight that installs vertically or horizontally, the 24″ × 36″ is the widest of the three, and the 16″ × 30″ is the one that also comes in gray-tinted glass.

Sauna window glass and frame

Each window is a dual-pane tempered glass unit, 1/2″ thick, filled with argon and coated LoE (low emissivity). It sits in a natural-finish Hemlock frame of 3/4″ × 5-1/2″ boards with its jamb and stops, and the frame adjusts to wall depths up to 5.5″. ProSaunas builds the windows by hand in Minnesota and rates them for indoor and outdoor saunas. Each one arrives assembled, with the frame, jamb, glass and an installation manual.

Sauna windows and heater size

Heater makers count glass when sizing a heater. Harvia's heater manuals add 1.2 cubic meters of room volume for each square meter of glass, about 4 cubic feet per square foot. A 24″ × 36″ window has 6 square feet of glass, so it adds about 24 cubic feet to the volume the heater is sized for; a 16″ × 30″ window adds about 13. Size the heater for the room plus its glass, door included.

How sauna windows ship

A window ordered without a door ships by small parcel at a flat $199 per order to the contiguous US. Ordered with a ProSaunas sauna door, it ships on the door's pallet, and the door's flat $395 freight covers both. Deliveries to Alaska, Hawaii, US territories and Canada are quoted after you order.

Sauna windows next steps

The door: sauna doors come in glass and solid wood.
The walls around it: see sauna paneling and sauna trim.
Planning the room: everything for a build is in sauna building materials.

Reviewed October 2026

Frequently Asked Questions

What glass is used in a sauna window?

These sauna windows use dual-pane tempered glass, argon-filled with a LoE coating, in a Hemlock frame. The 16 by 30 inch window comes in clear or gray-tinted glass; the 16 by 60 and 24 by 36 inch windows in clear.

Can a sauna window be used in an outdoor sauna?

Yes. The windows are rated for indoor and outdoor use.

What rough opening does a sauna window need?

17-7/8 by 31-7/8 inches for the 16 by 30 inch window, 17-7/8 by 61-7/8 inches for the 16 by 60, and 25-7/8 by 37-7/8 inches for the 24 by 36. The frame fits walls up to 5.5 inches deep.

Does a sauna window change the heater size I need?

Yes, a little. Harvia's heater manuals add 1.2 cubic meters of room volume for each square meter of glass, about 4 cubic feet per square foot, so a 24 by 36 inch window adds about 24 cubic feet to the volume the heater is sized for.

How much does it cost to ship a sauna window?

A flat $199 per order by small parcel to the contiguous US when the window is ordered without a door. Ordered with a ProSaunas sauna door, the window ships on the door's pallet and the door's flat $395 freight covers both.