Finnish Sauna Builders Indoor Sauna Kit - 4 × 5 × 8 ft

The Finnish Sauna Builders Custom Indoor sauna room kit supplies pre-cut interior components for a 4 × 5 × 8-foot room. Wood and bench-layout choices let you tailor the interior to your space.

Why This Product Stands Out

• Pre-cut interior boards and trim.
• Three wood options.
• Configurable bench layouts.
• All-glass door and sauna accessories.

Who This Is For

For homeowners or contractors fitting out an indoor sauna room, with framing, insulation, electrical wiring and exterior wall covering supplied separately.

Key Features

• Interior kit: Includes foil vapor barrier, 1 × 4 tongue-and-groove wall and ceiling boards, clear bench boards with supports, backrests, matching corner moldings and duckboard flooring.
• Bench layouts: Choose a configuration with 20-inch-deep benches.
• Door and ventilation: Includes an all-glass door with wood handles and trim, plus upper and lower vent grills.
• Accessories: A bucket with liner and ladle, thermometer, headrest and marine-grade wall-mounted vapor-proof light complete the kit.
• Wood choices: Grade A knot-free Western red cedar; Thermo Aspen/Alder treated at 419°F or higher; or Thermo Poplar treated at approximately 374°F. Cedar naturally resists moisture and decay; thermally modified options offer rich tones and dimensional stability.

Specifications

• Brand: Finnish Sauna Builders
• Product type: Indoor sauna interior kit
• Listed room size: 4 × 5 × 8 feet
• Wood options: Grade A knot-free Western red cedar, Thermo Aspen/Alder and Thermo Poplar
• Wall and ceiling boards: 1 × 4 tongue and groove
• Bench boards: Clear 1 × 4 with supports
• Bench depth: 20 inches
• Door frame: 27.2 × 78.7 inches / 690 × 2000 mm
• Door glass: 24.4 × 77.3 inches / 620 × 1963 mm
• Frame thickness: 1.65 × 3.6 inches / 42 × 92 mm
• Door rough opening: 28 × 80 inches
• Recommended ceiling height: Eight feet per manufacturer safety and clearance guidelines
• Heater choices described in source: Harvia KIP45B 4.5 kW with built-in controls; Harvia KIP45W 4.5 kW with Wi-Fi controls; HUUM Cliff Mini 3.5 kW with Wi-Fi controls
• Heater stones: Included with listed heater options
• Protective railing: Listed with HUUM Cliff Mini only
• Installation instructions: Included
• Customer-supplied components: Framing, insulation, electrical wiring and exterior wall covering

The kit includes an all-glass door, not a full glass wall. Backrests ship flat; on-site spacers can create an angled backrest. Wall boards normally run horizontally; where room width exceeds eight feet, an interior seam joins boards. Follow the recommended ceiling height and manufacturer clearance guidelines.