Custom Indoor Sauna Room - 4' x 5' x 8' - Finnish Sauna Builders

A fully custom interior sauna kit from Finnish Sauna Builders — choose from three premium wood types and a bench configuration built to your exact room dimensions, with everything needed to finish the interior once framing, insulation, and wiring are in place.

Right For You If…

• You want to choose your own wood type rather than a fixed single-material kit
• You're building a sauna into a custom or non-standard room size
• You're comfortable with (or hiring for) framing, insulation, and electrical work, and want the interior finish handled by a dedicated kit

What Makes It Worth It

• Choice of three wood types — Grade A knot-free Western red cedar, Thermo Aspen/Alder, or Thermo Poplar, each with a distinct look and performance profile
• Built to your room's exact dimensions — no fixed size constraints
• Customizable bench configuration — choose the layout that fits your space
• Complete finishing kit — includes wall and ceiling boards, bench boards, corner moldings, duckboard flooring, vent grills, all-glass door, sauna bucket and ladle, thermometer, headrest, and a vapor-proof light

Specs at a Glance