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An outdoor sauna is one of those purchases that people research for months before pulling the trigger and for good reason. It's a significant investment, it's going to live in your backyard for years, and the options are wide enough that it's easy to feel overwhelmed. The good news is that once you understand a few key decisions, the right sauna kit becomes pretty clear. Here's everything you need to know before you buy.
Summit Outdoor Sauna - 6 Person w/ Harvia Spirit Wi-Fi 8kW Heater
$9,999.00
Indulge in a refined take on Scandinavian design with the Summit Outdoor Sauna – a spacious, beautifully crafted unit built for comfort, performance, and style. Made from sustainably sourced hemlock and treated with our Thermowood heating process to enhance durability, ensuring… read more
What Exactly Is an Outdoor Sauna Kit?
An outdoor sauna kit is a pre-engineered sauna that ships to your home ready to assemble. Rather than building from raw lumber, you're working with pre-cut, interlocking panels designed to fit together precisely, no cutting, no special modifications, no contractor required for most installations. A quality kit arrives with everything included: the sauna structure, heater, sauna rocks, weather protection, and accessories. You're not chasing down missing parts after delivery.
The appeal is obvious. You get a premium sauna experience without the cost and timeline of a custom build, and the assembly process is manageable for anyone comfortable with basic construction work. Most quality outdoor sauna kits can be assembled in a few hours with two people and standard tools.
Wood: The Most Important Material Decision
Outdoor sauna kits are almost exclusively built from wood, but not all wood performs the same way in a sauna environment. The wood has to handle extreme heat, high humidity, repeated temperature swings, and outdoor exposure, a combination that destroys most building materials quickly.
Cedar
Cedar is the most common and most proven choice. It's naturally resistant to heat, moisture, and warping, it doesn't splinter easily, and it has a distinctive aroma that many sauna users love. Western red cedar in particular has a long track record in outdoor sauna construction.
Thermally modified wood
Is also called thermowood, is an increasingly popular alternative. The thermal modification process changes the wood's cellular structure, making it significantly more resistant to moisture, rot, and warping than untreated wood. It's darker in appearance and has excellent dimensional stability in outdoor conditions.
The Redwood Outdoors sauna kits we carry at South Table Sheds use sustainably harvested, thermally modified Canadian wood, built specifically for long-term outdoor durability. Select models are FSC-certified, meaning the wood is responsibly sourced with verified environmental standards.
Cabin Outdoor Sauna - 4 Person w/ Harvia Spirit Wi-Fi 8kW Heater
$9,299.00
Maximize your outdoor space with The Cabin Sauna, the perfect solution for small backyards. Designed to fit seamlessly into limited areas, this compact sauna doesn't compromise on comfort or functionality. Its two-level seating allows you to effortlessly cycle between high… read more
Sizing: How Many People and How Much Space
Outdoor sauna kits are typically sized by person capacity — 2-person, 4-person, 6-person, and so on. But person capacity is really a measure of interior bench space, not a strict headcount. A 4-person sauna comfortably seats two people lying down or four people sitting upright.
Before you settle on a size, measure your available backyard space and think about how you'll actually use the sauna. A 2-person sauna is ideal for solo sessions and couples. A 4-6 person sauna works well for families or anyone who wants the option to share the space with guests. Beyond 6 people, you're moving into more of a social wellness setup.
Our collection at South Table Sheds includes barrel saunas, cabin saunas, and compact designs sized for 2-6 people. We carry all from the Redwood Outdoors line.
Heating: What Powers the Experience
The heater is the heart of any sauna, and it's worth paying attention to rather than treating as an afterthought.
Traditional electric heaters
These are the standard for most outdoor sauna kits. They heat a pile of sauna rocks, which retain and radiate heat throughout the session. Pouring water over the rocks - löyly - creates a burst of steam that raises the perceived temperature and humidity. This is the classic sauna experience.
All of the Redwood Outdoors sauna kits we carry include premium Harvia heaters from Finland, which is one of the most respected names in sauna heating, with a 1-year warranty on heating elements and a 5-year limited warranty on other components for residential use. Harvia heaters are known for consistent performance and longevity.
Heater sizing matters.
A heater that's undersized for the sauna volume will struggle to reach temperature, especially in cold weather. Redwood Outdoors matches heater size to sauna volume in their kits, so you're not guessing.
Outdoor Sauna Kits in Colorado: A Natural Fit
Colorado is genuinely excellent sauna country. The climate, the culture around outdoor recreation and recovery, and the contrast between cold mountain air and sauna heat make for an experience that's hard to replicate anywhere else.
Cold-weather contrast bathing, which is moving between a hot sauna and cold outdoor air or a cold plunge, is one of the most widely practiced sauna traditions, and Colorado's winters make it easy. Step out of a 180-degree sauna into a January evening in the Denver metro and you understand immediately why Scandinavians have been doing this for centuries.
The dry Colorado climate also means less ambient moisture in the air around your sauna, which helps the exterior wood breathe and dry between sessions. Properly maintained, a quality outdoor sauna kit in Colorado will look and perform well for many years.
One thing to plan for: you'll want a level, stable base before installation. A concrete pad, compacted gravel, or pressure-treated deck framing all work well. Getting the foundation right is the single most important prep step before your sauna arrives.
Professional Assembly: When It Makes Sense
Most outdoor sauna kits are genuinely designed for DIY assembly, and plenty of buyers handle it themselves without issues. That said, there are situations where professional assembly is worth it, particularly if your site prep is complex, if you're not comfortable with the electrical connection for the heater, or if you simply want it done right the first time without a weekend project.
At South Table Sheds, we brings 17 years of construction experience to every sauna installation across the Denver metro, including Boulder, Arvada, Lakewood, and Colorado Springs. Every installation is properly leveled, sealed, and ready for its first session. If you're buying a sauna kit and want professional assembly in the Front Range area, that's a service we offer alongside the purchase.
What Comes With a Quality Outdoor Sauna Kit
When you're comparing kits, here's what a complete package should include, and what to flag as a gap if it's missing:
- The sauna structure itself with pre-cut, interlocking panels.
- A properly sized heater matched to the sauna volume.
- Sauna rocks. Weather protection for the exterior.
- A door with proper heat sealing. Interior benches sized for the capacity.
- Basic accessories, a felt sauna hat and doormat are standard in the Redwood Outdoors kits we carry.
- A printed assembly manual specific to your model.
What you'll typically source separately: your electrical connection (a licensed electrician for the heater circuit), your foundation or base, and any exterior finishing or landscaping around the sauna.
Browse our outdoor sauna kit collection at South Table Sheds. We carry the full Redwood Outdoors line: barrel saunas, cabin saunas, and compact designs for 2-6 people, all with premium Harvia heaters and professional assembly available throughout the Denver metro.
Interested in a shed or greenhouse kit? We've got you covered:
Greenhouse Kits for Sale and GreenhouseAssembly
FAQs
Are outdoor sauna kits hard to assemble?
Most quality kits are designed for assembly without cutting or special modifications. Pre-cut, interlocking panels fit together with basic tools in a few hours. The more involved part is usually site prep, getting a level base in place before the sauna arrives.
What size outdoor sauna kit should I buy?
Start with how you'll use it most often. Solo sessions and couples: 2-person. Families or occasional guests: 4-person. Regular group use: 6-person. When in doubt, size up! A sauna that feels slightly large is more comfortable than one that feels cramped.
Do outdoor sauna kits work in cold climates?
Yes, and in many ways they work better. Cold outdoor air makes the contrast between sauna heat and cool-down more dramatic, which is a central part of traditional sauna practice. Quality kits with proper insulation and a well-sized heater reach and hold temperature reliably even in Colorado winters.
