Custom Indoor Sauna Room - 6' x 9' x 8' - Finnish Sauna Builders
Transform your home into a wellness retreat with the Finnish Sauna Builders Custom Indoor Sauna Room Kit. This complete sauna package includes everything you need to build an authentic Finnish sauna experience, whether you're a DIY enthusiast or a professional contractor.
Complete Sauna Kit - Ready for Your Space
Our custom 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 Wood Options - Choose Your Perfect Finish
Select from three exceptional wood types, each offering distinctive benefits for your sauna interior:
Grade A Knot-Free Western Red Cedar
The classic choice for sauna enthusiasts. This premium softwood remains comfortably cool to the touch during sauna sessions and naturally resists moisture and decay. Enjoy its refined, knot-free appearance with beautiful color variations ranging from reddish to pinkish-brown tones, accented with darker bands and pale sapwood streaks.
Thermo Aspen/Alder
Experience the luxury of intense thermally modified wood, heat-treated at 419°F or higher. This advanced process creates a stunning deep, rich color while dramatically enhancing durability and dimensional stability. Perfect for those seeking a modern, sophisticated aesthetic with superior performance. Suitable for both indoor and outdoor applications.
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.
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 Custom Sauna Kit:
- Foil vapor barrier for proper moisture protection
- Ergonomic backrests for comfortable relaxation
- 1×4 tongue & groove boards (walls & ceiling) in your selected wood
- Clear 1×4 bench boards with supports (20″ deep) in matching wood—custom-built to your chosen configuration
- Corner moldings for walls, ceiling, and baseboards (matching wood)
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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 (matching wood)
- 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 DIY sauna kits deliver professional-quality materials at competitive prices.
Expert Support Available
Contact your Finnish Sauna Builders Specialist today for personalized guidance in creating the perfect sauna room for you and your family.
Note: Your sauna shipment will include an all-glass door, though some photos may display a glass wall for reference. Backrests are shipped flat; if you'd like an angled backrest, additional spacers can be easily created on-site to achieve your desired pitch.
Note: Wall boards run in the standard horizontal direction unless room width exceeds 8 ft; in such cases, an interior seam will be added where two boards meet to span the width.
Sauna Heater Comparison Chart
| Feature | Harvia Cilindro PC90 9KW | Harvia Cilindro PC90E 9KW | Harvia Virta 9KW | EOS Cubo Avantgarde 9KW | EOS Mythos S35 9KW |
|---|---|---|---|---|---|
| Product Image |
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| Power Output | 9 KW | 9 KW | 9 KW | 9 KW | 9 KW |
| Brand | Harvia | Harvia | Harvia | EOS | EOS |
| Control Type | Built-in Control | WiFi Control | WiFi Control | WiFi Control | WiFi Control |
| WiFi Connectivity | ❌ No | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |
| Heater Stones Included | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |
| Railing Included | ❌ No | ❌ No | ✅ Yes | ❌ No | ❌ No |
| Model Series | Cilindro Series | Cilindro Series | Virta Series | Cubo Avantgarde Series | Mythos Series |
| Model | PC90 | PC90E | Virta | Cubo Avantgarde | Mythos S35 |
| Remote Control | Manual only | App-based via WiFi | App-based via WiFi | App-based via WiFi | App-based via WiFi |
Harvia Cilindro PC90 9KW Built-in Control
Harvia Cilindro PC90E 9KW WiFi
Harvia Virta 9KW WiFi with Railing
EOS Cubo Avantgarde 9KW WiFi
EOS Mythos S35 9KW WiFi
Key Differences
Power & Heating Capacity:
- All models: 9 KW power output for powerful heating performance in larger sauna rooms
Brands:
- Harvia (Finnish): Cilindro PC90, Cilindro PC90E, Virta — trusted Finnish heritage brand with decades of sauna expertise
- EOS (German): Cubo Avantgarde, Mythos S35 — premium German engineering with innovative design aesthetics
Control & Connectivity:
- Cilindro PC90: Basic built-in control panel only — no remote or app features
- Cilindro PC90E, Virta, EOS Cubo Avantgarde & EOS Mythos S35: WiFi-enabled for smartphone control and scheduling
Design & Model Series:
- Cilindro Series: Iconic cylindrical design with large stone capacity, available in standard (PC90) and WiFi-enabled (PC90E) versions
- Virta Series: Premium Harvia model with WiFi control and included protective safety railing
- EOS Cubo Avantgarde: Bold cubic form with WiFi control and a striking modern aesthetic
- EOS Mythos S35: Sleek, minimalist German design with WiFi connectivity and high stone capacity
Included Accessories:
- All models come with heater stones included
- Harvia Virta is the only model in this lineup that includes a protective safety railing
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Shipping + Returns
Shipping
We promise to do our best to get your order to you as soon as possible. We provide estimated shipping times on the product pages. All orders are dispatched within 1-2 business days and delivered within 5-7 business days.
Order delays have proven to be unavoidable and outside of our control. While this might be frustrating, we ask you to please be patient and understanding with us in these tough times. We thank you for your business and appreciate your patience.
Please see our Returns and Refunds Policy for more details.
Returns & Refunds
If you need to exchange your product, you may do so. You, as the customer, are responsible for any shipping costs throughout any returns and exchange processes. Due to drastically increasing LTL/freight shipping costs, any outright returns will incur a 25% cancellation fee + return shipping costs. If you are replacing the product with something else, we may be able to help you cover some of the costs depending on the product.
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Frequently Asked Questions
Policies
Free USA shipping on most orders. Any order with an exception, will have this on the product page and at checkout.
We offer clear returns as long as your item meets the conditions outlined in our Return Policy. Items must be unused, in original packaging, and returned within the specified return window.
Absolutely! Our in-house product experts are here to help. Call us for personalized advice before or after your purchase.
Yes, we only sell 100% authentic, brand-new products, directly from reputable manufacturers and authorized distributors.