Cedar has been the default wood for sauna construction in North America for decades, and for good reason. It resists rot and insects without chemical treatment, stays cool to the touch at high temperatures, and fills the hot room with an aromatic scent that most sauna bathers associate with the experience itself. If you're shopping for a cedar sauna kit, though, you'll quickly discover that "cedar" isn't one thing — it's a category that includes different species, different grades, different kit formats, and wildly different price points.
This guide breaks down everything you need to know before buying, from the types of cedar used in sauna construction to the kit styles available, what to look for in terms of quality, and how to match a cedar sauna to your space, budget, and bathing preferences. We'll also highlight some of the best cedar sauna kits currently on the market across every major category.
Why Cedar Is the Preferred Sauna Wood
Before diving into specific kits, it helps to understand what makes cedar uniquely suited to the sauna environment. Saunas subject wood to extreme conditions — temperatures regularly exceeding 180°F, rapid humidity swings from dry heat to steam (löyly), and constant moisture exposure over years of use. Most wood species warp, crack, or decay under these conditions. Cedar thrives in them.
Cedar's cellular structure gives it a naturally low density, which translates directly to comfort inside the sauna. Low-density wood absorbs less heat energy, so cedar benches and backrests remain comfortable against bare skin even when the air temperature is well above 170°F. Denser woods like oak or maple would become painfully hot under the same conditions.
The natural oils (thujaplicins) present in cedar heartwood are responsible for its resistance to fungal decay, bacterial growth, and insect damage. These same oils produce the distinctive spicy-sweet aroma that cedar saunas are known for. Unlike pine or spruce, cedar doesn't secrete sticky resin when heated — a critical distinction in a sauna, where resin bleed can ruin benches and burn skin.
Cedar also has excellent dimensional stability. It expands and contracts less than most softwoods through repeated heating and cooling cycles, which means tighter joints, fewer gaps, and a longer-lasting build. This stability is why cedar has been the standard material for outdoor saunas that face not just heat stress internally but freeze-thaw cycles, UV exposure, and rain externally.
Types of Cedar Used in Sauna Construction
Not all cedar is created equal for sauna use, and understanding the differences between species will help you evaluate kits more critically. There are three types of cedar you'll commonly encounter when shopping for sauna kits.
Western Red Cedar (Thuja plicata)
Western Red Cedar is the gold standard for sauna construction and the most widely used species in the industry. Native to the Pacific Northwest — from British Columbia down through Washington and Oregon — these trees grow tall (up to 200 feet) and produce large-diameter lumber with tight, straight grain. The heartwood ranges from warm reddish-brown to amber, darkening with age and heat exposure. It produces the richest aromatic scent of any cedar species and has the highest concentration of natural preservative oils, giving it superior rot resistance. The vast majority of premium DIY sauna kits and pre-built outdoor saunas on the market use Western Red Cedar for both interior and exterior components.
Eastern White Cedar (Thuja occidentalis)
Eastern White Cedar grows throughout southeastern Canada and the northeastern United States. It's a smaller tree than its western cousin, producing lighter-colored wood with a pale tan to yellowish hue. The aroma is milder and sweeter than Western Red Cedar. White cedar performs well in sauna applications — it's lightweight, comfortable to the touch, and naturally resistant to decay — but it contains fewer protective oils than red cedar. This makes it slightly less durable in high-moisture outdoor environments over the very long term. Where white cedar excels is in its sustainability profile: the species replenishes itself in roughly 35 years, making it an environmentally responsible choice. You'll find Eastern White Cedar used extensively in barrel saunas and cabin-style kits from Canadian manufacturers like Dundalk LeisureCraft.
Aromatic Red Cedar (Juniperus virginiana)
Aromatic Red Cedar — also called Eastern Red Cedar — is technically a juniper, not a true cedar. It's the wood used in cedar closets and hope chests, prized for its potent mothball-like scent. While that fragrance is pleasant in a closet, it becomes overwhelming and potentially irritating to the respiratory system when amplified by sauna heat. Most sauna builders and experienced manufacturers advise against using aromatic red cedar as a primary construction material for saunas. If you encounter a "cedar sauna" at a suspiciously low price point, check the species carefully — aromatic red cedar lumber is significantly cheaper than Western Red or Eastern White.
Cedar Grades: Clear vs. Knotty
Beyond species, the grade of cedar in a sauna kit significantly impacts both appearance and price. The two grades you'll see most often are clear and knotty.
Clear cedar (Grade A or "B and Better") is hand-selected to be free of knots, producing a smooth, uniform surface with consistent color. It's considered the premium choice for sauna interiors and commands a higher price. Clear cedar is especially important for benches and backrests, where knots can become uncomfortably hot spots and create rough surfaces against skin.
Knotty cedar features visible knots and more grain variation, giving it a rustic, cabin-like character. It's a popular choice for wall and ceiling paneling in saunas where aesthetics lean traditional rather than modern. Knotty cedar is structurally sound for sauna use and typically costs 20–30% less than clear grade.
A smart approach that many builders use is combining the two: clear cedar for benches, backrests, and any surfaces that contact skin, with knotty cedar for walls and ceilings. This balances comfort and visual warmth with cost efficiency. When shopping for cedar sauna wood for a custom build, keep this hybrid strategy in mind.
Types of Cedar Sauna Kits
The term "sauna kit" covers a wide range of products, from interior-only material packages to complete turnkey outdoor structures. Understanding the different kit formats is essential to choosing the right product for your situation.
Interior Liner Kits (Material Kits)
An interior liner kit provides everything you need to finish the inside of a sauna room that has already been framed, insulated, and wired. A typical kit includes tongue-and-groove cedar wall and ceiling boards, pre-built benches and backrests, trim pieces, a vapor barrier, a sauna door, and sometimes a heater. You (or your contractor) supply the structural shell.
Liner kits are the most affordable way to get a fully cedar sauna because you're not paying for exterior materials, insulation, or a roof structure. They're ideal for converting an existing room, basement corner, or closet into a dedicated sauna space. Our complete DIY sauna room kits follow this format, using 100% clear, kiln-dried Western Red Cedar with tongue-and-groove construction and dual-height benches.
Prefab Modular Kits (Indoor and Outdoor)
Prefab modular kits come as pre-built wall, ceiling, and floor panels that stack and connect together to form a freestanding sauna room. Unlike liner kits, they don't require an existing framed structure — you assemble them directly on a flat, hard surface like a concrete slab, paver patio, or reinforced deck. These kits include insulation (typically R-11 to R-20), and outdoor versions add weather-resistant exterior cladding, a roof system, and waterproofing materials.
Modular kits bridge the gap between a full DIY build and a pre-assembled sauna. They require basic carpentry skills and usually a second pair of hands, but most can be assembled in a weekend. The walls arrive with insulation, vapor barrier, and cedar paneling already installed, so you're connecting completed sections rather than building from raw materials. Explore our full selection of DIY outdoor sauna kits to see what's available in this format.
Barrel Sauna Kits
Barrel saunas are cylindrical structures assembled from curved staves (planks) held together with steel bands, like an oversized wine barrel. They're designed exclusively for outdoor use and are the most popular outdoor sauna format in North America. The curved shape reduces interior air volume compared to a rectangular room of the same footprint, which means faster heat-up times and more efficient heating. Cedar barrel saunas are available in both Western Red Cedar and Eastern White Cedar, with sizes ranging from compact 2-person models (about 6 feet long) to extended 8-person units with separate changing rooms.
The trade-off with barrel saunas is bench flexibility. The curved floor requires flat-bottomed bench inserts, and the curved walls limit upper-tier bench options. If a multi-tier bench layout is important to you, a cabin-style or pod-shaped sauna may be a better fit. Browse our full barrel sauna collection to compare sizes and configurations.
Cabin Sauna Kits
Cabin-style saunas are traditional rectangular structures with vertical walls, a peaked or shed-style roof, and a layout that closely resembles a small building. They offer the most interior flexibility — room for upper and lower bench tiers, L-shaped bench configurations, windows, and sometimes a separate changing room or porch. Cabin saunas are generally constructed from thicker lumber (often 2x6 tongue-and-groove) and can accommodate larger heaters. They're the best choice if bench comfort, multi-tier heat stratification, and interior space are your top priorities. Check out our cabin sauna collection for options from brands like Dundalk LeisureCraft and True North.
Pod and Cube Sauna Kits
Pod saunas feature a curved roof with flat walls and floor — a hybrid between barrel and cabin designs. They offer the flat floor and wider benches of a cabin with some of the aesthetic appeal and efficient heating of a curved-wall design. Cube saunas take a more modern, minimalist approach with clean geometric lines and large glass elements. Both formats are available with cedar construction and represent newer entries in the outdoor sauna market.
Best Cedar Sauna Kits by Category
Best Cedar Barrel Saunas
For barrel sauna shoppers, Dundalk LeisureCraft and True North Saunas are the two brands that consistently deliver the highest quality cedar barrel kits. Dundalk builds all of their barrels from Canadian-sourced cedar (both Western Red and Eastern White options are available depending on the model), with thick stave construction, stainless steel band hardware, and heater packages from Harvia or Huum. Their models range from compact 2-person units to large 8-person barrels with front porches and changing rooms. True North offers a similar range with an emphasis on customization — you can often choose your wood species, heater type, and window configuration.
The Dundalk Canadian Timber Harmony is a standout in the 4-person category. It uses Eastern White Cedar throughout, includes a Harvia KIP electric heater, and features the classic barrel profile with a rear window for natural light. For those who want Western Red Cedar specifically, the True North Schooner series offers barrel saunas in multiple lengths with red cedar as a standard option.
Best Cedar Cabin Saunas
The Dundalk Georgian Cabin Sauna is one of the best cedar cabin kits available. It's built from Eastern White Cedar logs (2x6 tongue-and-groove construction), includes a separate changing room, double-paned windows, and a Harvia electric heater. The changing room adds significant practical value — a dry, sheltered space to undress, cool down, and store towels. For a pure Western Red Cedar cabin option, the True North cabin line offers traditional gable-roof designs with red cedar interiors and exteriors.
Best Cedar Traditional Saunas (Indoor and Outdoor)
Golden Designs produces several well-regarded traditional saunas that feature Canadian Red Cedar interiors. The Savonlinna is a popular outdoor model with a red cedar interior, hemlock exterior, and an 8kW Harvia electric heater — a proven combination for consistent, high-quality steam sessions. For a fully cedar interior and exterior in a traditional format, look at the Golden Designs Bergen or Osla models, which pair red cedar interiors with weather-resistant exterior panels designed for year-round outdoor use.
For indoor traditional saunas, the Golden Designs Copenhagen line uses Canadian Red Cedar construction in a compact indoor footprint, making it a strong choice for basements, home gyms, and spare rooms.
Best Cedar Hybrid Saunas (Traditional + Infrared)
If you want the flexibility to switch between traditional steam heat and infrared therapy, hybrid saunas combine both heating systems in a single unit. The Golden Designs Karlstad is one of the most versatile options in this category — a 6-person sauna with a Canadian Red Cedar interior, full-spectrum infrared heaters, and a traditional electric heater, all housed in an all-weather exterior designed for outdoor installation. This dual-system approach lets you enjoy traditional löyly on some days and gentler infrared heat on others without needing two separate saunas.
Best Cedar Infrared Saunas
For dedicated infrared saunas built with cedar, Maxxus and Finnmark Designs are leading options. The Maxxus line includes several models constructed from Canadian Red Cedar with near-zero EMF full-spectrum infrared heaters — meaning you get near, mid, and far infrared wavelengths for the deepest therapeutic coverage. Finnmark Designs takes a more premium approach with FSC-certified Western Canadian Cedar interiors and their proprietary Spectrum Plus infrared technology, which reaches 170°F in under an hour. Finnmark also offers combination units that integrate infrared, traditional steam, and red light therapy in a single cedar sauna.
Best Cedar DIY Sauna Room Kits
For those building a sauna into an existing framed space, our DIY sauna room kits use 100% clear, kiln-dried Western Red Cedar with tongue-and-groove boards, pre-built dual-height benches, and all the trim and materials needed for a complete interior finish. These kits are available in both traditional (electric heater) and infrared configurations. The traditional kits pair with stainless steel electric sauna heaters from brands like Harvia and Huum, while the infrared kits include low-EMF heater panels. If you're not sure what heater size you need for your space, use our sauna heater sizing calculator to get a recommendation based on your room's cubic volume.
What to Look for When Buying a Cedar Sauna Kit
Wood Species and Grade
Confirm whether the kit uses Western Red Cedar, Eastern White Cedar, or another species. Check whether benches are clear grade (they should be, at minimum). For wall and ceiling paneling, both clear and knotty grades work well — it's a matter of aesthetic preference and budget.
Board Thickness
Sauna-grade cedar paneling should be at least 1/2" thick, with 11/16" considered the professional standard. Thinner boards (5/16") lack structural rigidity, often require face-nailing instead of blind-nailing through the tongue, and don't hold up as well to years of heat cycling. If a kit doesn't specify board thickness, ask before purchasing.
Heater Compatibility and Inclusion
Some kits include a heater; others sell the heater separately. If the heater is included, check the brand and kW rating to make sure it's properly sized for the sauna's cubic volume. Undersized heaters are a common issue with budget kits — they struggle to reach proper sauna temperatures (175–195°F) and produce weak steam. Reputable kit manufacturers pair their saunas with heaters from established brands like Harvia, Huum, or Tylo. Browse our full selection of sauna heaters if you need to source one separately.
Insulation (for Outdoor Kits)
Any outdoor sauna kit should include insulation in the walls and ceiling. Look for R-11 or higher in the walls and R-20 in the ceiling. Barrel saunas are the one exception — their stave construction typically doesn't include insulation, which is one reason they can take slightly longer to heat in very cold climates. If you live in a northern climate and want the fastest heat-up times, an insulated cabin or modular kit will outperform an uninsulated barrel.
Bench Design
Look for benches with no visible fasteners on the seating surface (screws and nail heads become hot spots). Quality kits use hidden fastener systems or underside mounting. Two-tier bench layouts are ideal for traditional saunas because they let bathers choose between milder heat on the lower bench and more intense heat at the upper level, where temperatures are 20–30°F hotter.
Door Quality
A proper sauna door should seal well without latching tightly — sauna doors are never locked from the inside and should open outward for safety. Glass doors are popular because they let light in and reduce the feeling of enclosure. For outdoor kits, look for tempered, double-paned glass to handle temperature differentials.
Cedar vs. Other Sauna Woods
While this guide focuses on cedar, it's worth understanding how it compares to the alternatives so you can make an informed choice.
Cedar vs. Hemlock: Hemlock is the most common alternative to cedar, especially in infrared saunas. It's lighter in color (pale white to light brown), produces virtually no scent, and costs less than cedar. Hemlock performs well indoors but lacks cedar's natural oil content, making it less durable for outdoor use. If you have scent sensitivities or prefer a neutral-smelling sauna, hemlock is a good choice. If you're building outdoors or want the classic aromatic sauna experience, cedar is the stronger option.
Cedar vs. Thermally Modified Wood: Thermally modified spruce and aspen (thermowood) are heat-treated to enhance moisture resistance and dimensional stability without chemicals. Thermowood has become the standard material for European sauna manufacturers and is increasingly popular in North America. It's extremely stable, highly weather-resistant, and has a distinctive dark brown tone. The trade-off is that thermowood lacks cedar's natural aroma. Brands like SaunaLife and Auroom build primarily with thermally modified wood.
Cedar vs. Pine/Spruce (Untreated): Untreated pine and spruce are budget-friendly options, but they come with downsides for sauna use. Both species produce resin, which can bleed from knots when heated. They're also less resistant to moisture damage than cedar. Pine and spruce can work for indoor saunas with proper ventilation, but they're poor choices for outdoor installations unless thermally modified.
Installation and Placement Considerations
Indoor Cedar Saunas
The most common indoor locations for a sauna are basements, spare bathrooms, master bathroom additions, and garage conversions. You'll need a flat, waterproof floor (concrete, tile, or vinyl — never carpet), a dedicated electrical circuit for the heater (most electric sauna heaters require 240V), adequate ceiling height (7 feet is standard, 8 feet is ideal), and proper ventilation with an intake vent near the floor and an exhaust vent near the ceiling on the opposite wall.
For indoor sauna installations using a liner kit, you'll need to frame the walls with standard 2x4 studs, insulate with fiberglass batts (R-13 is sufficient for interior walls), install an aluminum vapor barrier on the warm side of the insulation, and then apply the cedar paneling over the barrier.
Outdoor Cedar Saunas
Outdoor saunas need a level, stable foundation — a concrete pad, paver patio, or reinforced deck. The foundation should be slightly elevated or sloped to allow water drainage away from the structure. Position the sauna with the door facing away from prevailing winds to maintain interior heat when the door opens, and as close as practical to your home's electrical panel to minimize wiring costs. Check local building codes for setback requirements (distance from property lines) and whether your sauna's footprint requires a permit — most structures under 120 square feet are classified as accessory structures and may be exempt, but this varies by municipality.
Maintaining a Cedar Sauna
One of cedar's greatest advantages is its low maintenance requirements. For interior surfaces, regular maintenance is simple: wipe down benches with a damp cloth after each use, leave the door open for 15–20 minutes after bathing to allow moisture to escape, and occasionally sand any rough spots on bench surfaces. Never apply stains, sealants, or varnishes to interior cedar surfaces — these products can off-gas toxic fumes when heated.
For outdoor cedar, the exterior will naturally weather to a silver-gray patina if left untreated. If you want to preserve the original reddish-brown color, apply a UV-protective exterior wood finish once or twice a year. The interior of an outdoor sauna should be treated the same as an indoor sauna — no sealants, just ventilation and occasional wiping.
A well-maintained cedar sauna can last 20–30 years or more. The heater and electrical components will likely need replacement before the cedar shows any structural deterioration.
How Much Do Cedar Sauna Kits Cost?
Pricing for cedar sauna kits varies widely depending on the type, size, wood grade, and included components. Here's a general range to help with budgeting:
Interior liner kits for a small to mid-size room (4x6 to 6x8 feet) typically range from $2,500 to $6,000, depending on cedar grade and whether a heater is included.
Barrel sauna kits range from roughly $4,000 for compact 2-person models to $12,000 or more for large 6–8 person barrels with porches and premium heater packages.
Cabin sauna kits start around $6,000 for basic models and can exceed $15,000 for large units with changing rooms, double-paned windows, and heavy-duty heaters.
Pre-built indoor saunas (fully assembled cedar saunas for indoor use) range from $3,000 to $8,000 for infrared models and $4,000 to $12,000 for traditional or hybrid models.
As a general rule, Western Red Cedar commands a 15–25% premium over Eastern White Cedar in comparable kits, and clear grade adds 20–30% over knotty grade. Heater inclusion, glass door upgrades, and additional features like LED lighting or Bluetooth audio also affect the final price. Browse our full sauna collection to compare options across every price range.
Frequently Asked Questions
Is cedar the best wood for a sauna?
Cedar is the most popular and most broadly recommended sauna wood in North America for good reason — it combines natural moisture and decay resistance, low thermal conductivity (stays cool to the touch), dimensional stability, and a pleasant aroma in a single species. Whether it's the "best" depends on your priorities. If scent sensitivity is a concern, hemlock's lack of aroma may be preferable. If maximum weather durability is the priority, thermally modified wood may edge out cedar in extreme outdoor conditions. For the majority of home sauna builders, cedar is the safest and most satisfying all-around choice.
Can I build a cedar sauna myself?
Yes. Interior liner kits are designed for DIY installation and require only moderate carpentry skills — the ability to measure, cut, and nail tongue-and-groove boards. Prefab modular kits and barrel saunas involve heavier components but are assembled with basic hand tools and typically include step-by-step instructions. The one area where professional help is strongly recommended is electrical work. Sauna heaters require dedicated circuits (usually 240V/40A or higher), and improper wiring is a fire and safety hazard. Always hire a licensed electrician for heater installation.
How long does a cedar sauna last?
With proper ventilation and basic maintenance, a cedar sauna can last 25–30 years or more. The wood itself can endure decades of heat and moisture cycling. The components most likely to need replacement first are the heater elements (typically every 10–15 years depending on use frequency), heater stones (every 1–2 years for frequent bathers), and door seals.
Do cedar saunas need to be sealed or stained?
Interior cedar should never be sealed, stained, or varnished. Any coating applied to interior sauna surfaces will off-gas when heated, releasing chemicals into the air you're breathing. Cedar's natural oils provide all the moisture protection the interior needs. Outdoor exterior surfaces can be treated with a breathable, UV-protective wood oil to preserve color, but this is cosmetic — untreated exterior cedar will gray naturally and continue to perform structurally.
What size cedar sauna do I need?
A common guideline is to allow roughly 2 feet of bench length per bather. A 4x6-foot sauna comfortably seats 2–3 people, a 5x7 seats 3–4, a 6x8 seats 4–6, and an 8x10 or larger accommodates 6–8. Ceiling height should be 7–8 feet for optimal heat stratification. Remember that the heater also needs floor space and clearance from walls (varies by model), so factor that into your layout. Our heater sizing tool can help you match heater capacity to your room dimensions.
Are cedar saunas safe for outdoor use year-round?
Yes. Cedar is one of the best natural woods for year-round outdoor exposure. Its oils protect against rain, snow, UV, and freeze-thaw cycles. Outdoor cedar saunas from reputable manufacturers are built with weatherproofing in mind — exterior cladding, roofing systems, and drainage considerations are part of the design. If you live in a region with heavy snowfall, a peaked roof (rather than flat) helps prevent snow accumulation, and a covered porch adds convenience for entering and exiting during wet weather.
What type of heater should I pair with a cedar sauna?
For traditional saunas, an electric heater from Harvia, Huum, or a comparable brand is the standard choice. Size the heater based on your sauna's cubic volume — roughly 1 kW per 50 cubic feet is a common guideline, though glass surfaces, exterior walls, and ceiling height can increase the requirement. Wood-burning stoves are an alternative for outdoor saunas where you want an off-grid or more rustic experience. For infrared saunas, low-EMF carbon or ceramic heater panels are built into the kit. Browse all sauna heaters to find the right match for your build.
Start Shopping for Your Cedar Sauna
Whether you're looking for a compact indoor kit to install in your basement this weekend or a full-size outdoor barrel sauna for your backyard, cedar delivers the performance, beauty, and longevity that make a sauna worth the investment. Explore our complete sauna collection to find the right cedar sauna kit for your space, or visit the Sauna Learning Center for more in-depth guides on heater selection, installation, wood types, and sauna health benefits. If you need help choosing, our team is available by phone or chat at (360) 233-2867.
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