Carbon Smart Saunas - 4' x 4' x 8' - by Finnish Sauna Builders

Transform your home into a wellness retreat with the Carbon Smart™ Indoor Sauna Room Kit. This complete sauna package includes everything you need to build an authentic sauna experience, whether you're a DIY enthusiast or a professional contractor.

Complete Sauna Kit - Ready for Your Space

Our Carbon Smart™ indoor sauna kit arrives with all interior components precisely cut and tailored to your room dimensions. Simply provide the framing, insulation, electrical wiring, and exterior wall covering—we supply the rest. Building your dream sauna has never been easier or more affordable.

Premium Thermo Poplar Wood

Carbon Smart™ saunas are crafted exclusively with Thermo Poplar, a sustainably sourced and thermally modified wood that delivers exceptional performance and a beautiful aesthetic for your sauna interior.

Thermo Poplar

A thermally modified wood treated at approximately 374°F for optimal indoor sauna use. This medium modification delivers enhanced dimensional stability, improved resistance to humidity and temperature fluctuations, and a warm, rich tone—all achieved through a chemical-free process. Ideal for creating a naturally beautiful, long-lasting sauna environment. As part of the Carbon Smart™ line, this wood is responsibly sourced to support carbon-smart forestry practices.

Customizable Bench Configurations

Choose the bench layout that best fits your space and needs from our selection of configurations shown in the product images. Each configuration is designed to maximize comfort and optimize your sauna experience.

What's Included in Your Carbon Smart™ Sauna Kit:

• Foil vapor barrier for proper moisture protection
• Ergonomic backrests for comfortable relaxation
• 1×4 tongue & groove boards (walls & ceiling) in Thermo Poplar
• Clear 1×4 bench boards with supports (20″ deep) in Thermo Poplar—custom-built to your chosen configuration
• Corner moldings for walls, ceiling, and baseboards (Thermo Poplar)
• All-glass sauna door with wood handles and trim
  • Frame: 27.2″ × 78.7″ (690 × 2000 mm)
  • Glass: 24.4″ × 77.3″ (620 × 1963 mm)
  • Frame thickness: 1.65″ × 3.6″ (42 × 92 mm)
  • Rough opening required: 28″ × 80″
• Duckboard flooring for walk area (Thermo Poplar)
• Upper and lower vent grills for proper air circulation
• Traditional sauna bucket with liner and ladle
• Sauna thermometer for temperature monitoring
• Comfortable headrest
• Marine-grade, wall-mount, vapor-proof sauna light
• Detailed installation instructions for easy assembly

Important Installation Notes:

• Recommended ceiling height is 8 feet per manufacturer safety and clearance guidelines. For custom ceiling heights, please contact our support team.

Perfect for Home or Commercial Use

Whether you're building a personal wellness sanctuary or outfitting a spa or gym, our Carbon Smart™ DIY sauna kits deliver professional-quality materials at competitive prices.

Expert Support Available

Contact your Carbon Smart™ Specialist today for personalized guidance in creating the perfect sauna room for you and your family.