Thermory 6 Person Square Sauna No 40 DIY Kit with Terrace and Window

Act quickly—our inventory moves fast among sauna enthusiasts. Contact our team today or place a preorder to secure your place in the embrace of the No40 series.

The Thermory No 40 Sauna Square is a 6-person square sauna kit with a full tempered glass front, deep tiered benches and a covered terrace, built from thermally modified Nordic spruce. The square form gives more than seven feet of headroom and room to lie back on the upper bench, while the glass front fills the room with daylight.

It suits buyers who want a modern cabin-style sauna rather than a barrel, with the porch serving as a sheltered cool-down space. The heater is sold separately.

Features

• Full tempered glass front (window size 75.2 x 38.2 in. per current listing)
• Covered terrace (porch length 19.32 in. per current listing)
• Deep, tiered benches for sitting or reclining
• Thermally modified Nordic spruce, treated with heat and steam only, for rot resistance and dimensional stability
• 1.57 in. wall boards for insulation and even heat (per current listing)
• Smooth-milled surfaces that stay comfortable to the touch
• Protective rain jacket roof cover included
• DIY kit with pre-cut parts and step-by-step assembly instructions

Look inside a Thermory sauna (360 view of the barrel No 54, shown for wood and finish only), click and drag to look around:

Key Specifications

Dimensions and Cutout

What Is Included and What You Will Need

• Included: sauna body staves and wall elements, tempered glass front, tiered benches, porch, rain jacket roof cover and all assembly hardware (per current listing)
• Required: a sauna heater sized for 241 cu ft, installed to the heater maker's instructions; electric heaters need a dedicated circuit installed by a licensed electrician
• Required: a level foundation and freight access for a crate about 99 in. long and a kit of about 1,820 lb

Installation Notes

Plan the delivery path and foundation before ordering: the kit ships in a crate about 34.6 x 45.3 x 98.8 in. and weighs about 1,820 lb. Build on a level, drained base, follow Thermory's assembly instructions, supervise the first heating and keep heater wiring to a licensed electrician. Local zoning and permit rules for accessory structures vary, so check with your town or HOA. Talk to our team about siting and heater selection.

Documentation

• Thermory Sauna Square No 40 Assembly Instructions

Frequently Asked Questions

Does it include a heater?

No. Choose an electric or wood-fired heater rated for about 241 cu ft. Ask us for a recommendation.

What is the difference between the No 40 and No 41?

Both are 6-person square saunas with a terrace and the same listed footprint. The No 40 is listed with a window and the No 41 without; ask us to confirm the glazing layout before you order.

How heavy is it?

About 1,820 lb per the current listing, so plan a foundation and delivery route to suit.

Why thermally modified spruce?

Heat and steam treatment reduces moisture uptake and rot and keeps the boards stable, without chemical treatment.

Warranty

Per current listing: Thermory provides a 2-year limited warranty on the wood structure against construction, manufacturing and material defects. Heaters, lighting, electrical components and glass are warranted separately by their makers (the listing notes that Huum electric heaters carry their own 5-year limited warranty, excluding heating elements).