Custom Saunas Built and Installed for St. Louis Homes
From Kirkwood backyards to Central West End condos, we design and build custom saunas made for real Missouri seasons: freezing Januaries, humid Julys, and every recovery day in between.
We Come To You. In-home consultations across the St. Louis metro.
Your Local Custom Sauna Builder
St. Louis Custom Saunas is a locally operated custom sauna builder and installer serving St. Louis, Missouri and surrounding communities with handcrafted indoor, outdoor, infrared, steam, and commercial sauna installations. As a dedicated sauna contractor, we handle every stage of your project: design consultation, material selection, permitting guidance, construction, and final walkthrough. Our builds use premium cedar and hemlock, commercial-grade heaters, and insulation detailing suited to the Midwest climate. Whether you want a barrel sauna behind a Webster Groves bungalow, an infrared room in a Chesterfield basement, or a full steam room in a Ladue home, our team builds it from scratch to fit your space, your budget, and the way you actually plan to use it. We are a service-area business, so every project starts with us coming to you.
Custom Sauna Services in St. Louis
Six ways to bring heat home. Every build is designed around your property, your goals, and the four seasons St. Louis actually gets.
Indoor Saunas
Basements, spare bedrooms, and finished garages across St. Louis make ideal sauna spaces. We design custom indoor saunas with proper ventilation, vapor barriers, and electrical work, turning unused square footage into a private wellness room you can use every day of the year.
Learn More
Outdoor Saunas
Backyard saunas built to handle Missouri weather. From cabin-style builds in Wildwood to compact barrel saunas in Tower Grove, we construct outdoor saunas with weatherproof roofing, insulated walls, and foundations rated for freeze-thaw cycles so they perform through every season.
Learn More
Infrared Saunas
Low-temperature, deep-heat therapy in a custom-built room. Our infrared sauna installations pair full-spectrum panels with chromotherapy lighting and efficient wiring, ideal for St. Louis homeowners focused on recovery, circulation, and daily use without traditional sauna heat levels.
Learn More
Steam Rooms
Fully tiled, professionally waterproofed steam rooms built into St. Louis homes. We handle steam generator sizing, sloped ceilings, drainage, and mosaic or stone finishes, delivering a spa-grade steam experience engineered to protect the rest of your house from moisture.
Learn More
Commercial Saunas
Gyms, spas, hotels, and athletic facilities across the St. Louis metro trust us for commercial sauna construction. We build high-capacity rooms with commercial-grade heaters, durable bench framing, and code-compliant ventilation designed for heavy daily traffic.
Learn More
Prefab Sauna Installation
Already purchased a prefab or modular sauna unit? We handle professional delivery coordination, site prep, assembly, and electrical hookup so your prefab sauna is installed correctly the first time, with the wiring and clearances your manufacturer warranty expects.
Learn More
Built Like This City: To Last
Custom Builds from Scratch
We do not resell kits and call it custom. Every sauna is designed on paper first, then framed, insulated, wired, and finished by hand to fit your exact space, from odd basement corners to sloped backyards near the River Des Peres.
Designs Built for St. Louis Weather
Our region swings from ice storms to 100-degree humidity. We spec insulation, vapor barriers, roofing, and foundations for genuine four-season performance so your sauna works as hard in January as it does in July.
Licensed and Insured Contractors
Sauna construction involves electrical, ventilation, and sometimes plumbing work. Our crews are licensed and insured, and we build to code across St. Louis City, St. Louis County, and St. Charles County jurisdictions.
End-to-End Project Management
One team owns your project from the first in-home consultation through the final walkthrough. Design, materials, permits, construction, and cleanup are all coordinated by us, so you never have to chase subcontractors.
How It Works
Consultation
We come to your home anywhere in the St. Louis metro, look at your space, talk through how you plan to use the sauna, and give you honest guidance on type, size, and realistic budget before anything is drawn.
Design
You get a complete design proposal: layout, dimensions, wood species, heater selection, bench configuration, lighting, and a line-item quote. We revise it with you until the plan matches exactly what you want.
Permitting
Depending on your municipality, electrical or structural permits may apply. We identify what your project needs, prepare the documentation, and guide the approval process so the build stays compliant and on schedule.
Build
Our crew frames, insulates, wires, and finishes your sauna with premium cedar or hemlock. Most residential builds take one to three weeks on site, and we keep the work area clean and contained throughout.
Walkthrough
We fire the sauna up together, walk you through heater operation, ventilation, and maintenance, and hand over care instructions. You start your first session knowing exactly how everything works.
Craftsmanship You Can See
A look inside recent custom sauna projects: hand-finished benches, precision paneling, and the details that separate a built sauna from a boxed one.
What St. Louis Homeowners Say
"We had a 6x8 cedar sauna built in our basement in Kirkwood. The crew was straightforward about what our electrical panel could handle, adjusted the heater spec accordingly, and finished in about two weeks. Benches are solid and the room heats evenly."
"After two winters of talking about it, we finally put an outdoor sauna behind our house in Webster Groves. They handled the concrete pad, the build, and the county paperwork. Used it through the whole ice storm week in February. Worth every dollar."
"Practical, no-pressure process. They talked me out of a bigger unit than I needed and built a two-person infrared room in our Chesterfield home instead. Clean work, showed up when they said they would, and the walkthrough at the end was genuinely useful."
St. Louis Sauna FAQ
St. Louis Custom Saunas is a locally operated custom sauna builder and installer serving St. Louis, Missouri and the surrounding metro. We design and construct indoor, outdoor, infrared, steam, and commercial saunas from scratch, and we also professionally install prefab sauna units. We are a service-area business: we come to you for every consultation and build.
Most custom residential saunas in the St. Louis area fall between $8,000 and $35,000 depending on size, sauna type, materials, and site conditions. Indoor builds in existing rooms tend to start lower, while large outdoor structures and fully tiled steam rooms sit at the higher end. Prefab installations cost less because the unit itself is already purchased. Every project begins with a free in-home consultation and a line-item quote, so you know exactly where every dollar goes before we start.
Most residential custom sauna builds take one to three weeks of on-site work once construction begins. Prefab sauna installations are usually completed in one to three days. Total project timelines depend on design revisions, material lead times, and whether your municipality requires permits.
We build and install six categories: indoor saunas, outdoor saunas, infrared saunas, steam rooms, commercial saunas, and prefab sauna installations. Within those categories we build traditional Finnish-style rooms, barrel saunas, cabin saunas, full-spectrum infrared rooms, and tiled steam rooms with properly sized generators.
Call (314) 499-4445 or submit the form on our contact page. We schedule an in-home consultation anywhere in the St. Louis metro, assess your space, and deliver a complete design and quote. There is no cost and no obligation for the consultation.
All sauna types perform well here, which is part of why St. Louis is a strong sauna market. Outdoor traditional saunas shine in winter, when stepping into 180-degree heat from a 20-degree backyard is the whole point. Indoor and infrared saunas get heavy year-round use because they are unaffected by summer humidity. We build every outdoor unit with insulation and roofing rated for Missouri freeze-thaw cycles.
Western red cedar and Canadian hemlock are our primary interior woods, chosen for heat tolerance, low sap content, and durability. Structures use standard framing lumber with foil vapor barriers and mineral wool insulation. Steam rooms are built with cement board, waterproof membranes, and ceramic, porcelain, or stone tile.
It depends on the project and jurisdiction. Electrical work for heaters typically requires a permit in St. Louis City and St. Louis County, and detached outdoor structures over certain sizes may need building permits. We identify the requirements for your specific address and handle the documentation as part of the project.
Traditional saunas heat the air to 150-195 degrees using an electric or wood-fired heater, often with steam from water poured over stones. Infrared saunas use panels that warm your body directly at lower air temperatures, usually 115-135 degrees. Traditional delivers the classic intense heat-and-steam experience; infrared offers longer, gentler sessions and lower operating costs.
Yes. We build commercial saunas and steam rooms for gyms, spas, hotels, country clubs, and athletic facilities across the St. Louis metro. Commercial projects include high-capacity heaters, reinforced benching, code-compliant ventilation, and materials selected for constant daily use.
Maintenance is simple: ventilate the room after each session, wipe benches with a damp cloth, and use towels while sitting to protect the wood. Once or twice a year, lightly sand benches if needed and check heater stones for cracking. Steam rooms should be squeegeed after use and have grout inspected annually. We cover the full care routine for your specific build during the final walkthrough, and we are a phone call away if anything ever needs attention.
A 4x6 room fits two people comfortably and suits most couples. A 6x8 room seats four and works well for families. Commercial rooms typically start at 8x10. As a rule of thumb, allow about two feet of bench length per seated person, plus more if you want to lie down. We size the heater to the room volume during design.