Leil Saunas Celto Outdoor Sauna
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An Important Note on Pricing and Returns:
We believe in upfront pricing and fair policies—no hidden fees, no surprises, and easy,
transparent returns. If you're comparing options, we encourage you to review
competitors’ fine print carefully.
We've helped countless customers who had issues elsewhere, and we’re here to make sure
that never happens to you.
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LEIL CELTO S & M
Outdoor Sauna Collection
Compact Scandinavian outdoor sauna design with solid CLT construction, generous glass, and refined interior details.
The Leil Celto S and Celto M are compact outdoor saunas designed to bring a modern Scandinavian aesthetic and traditional sauna experience to smaller outdoor spaces. Both models combine substantial 60mm CLT construction with generous tempered-glass surfaces, creating bright interiors that feel connected to the surrounding landscape.
The Celto S is the more compact option, measuring approximately 65 x 56 inches externally and accommodating two people. The Celto M provides the larger footprint for users who want additional interior space while maintaining the same architectural design language and outdoor sauna concept.
Both models feature multi-level Aspen seating, a wide Aspen backrest, integrated LED lighting beneath the backrest, ventilation openings, and an EPDM roof membrane. Each sauna is supplied as a DIY kit with pre-cut components and an illustrated assembly manual.
Scandinavian simplicity, reimagined for compact outdoor sauna living.
A modern outdoor sauna that brings together architectural form, natural materials, and everyday usability.
The Celto collection takes a compact approach to outdoor sauna design without reducing the experience to a basic cabin. Large glazed surfaces introduce natural light and create a strong visual connection between the sauna interior and its surroundings, while the clean exterior gives the structure a distinctly modern Scandinavian character.
The solid 60mm CLT wall, ceiling, and floor construction provides the structural foundation of both models. Inside, Aspen benches are arranged across two levels to make efficient use of the available vertical space, while the wide one-board Aspen backrest adds comfort and a clean visual finish.
Integrated LED strips beneath the backrest provide subtle interior illumination. Ventilation openings support airflow, while the EPDM roof covering adds a weather-protective layer for outdoor installation. Together, these details make the Celto S and M practical compact sauna options for patios, gardens, and outdoor wellness spaces.
- Solid 60mm CLT walls, ceiling, and floor construction
- Generous tempered-glass surfaces for a bright, open interior
- Two-level Aspen bench system for efficient compact-space seating
- Wide one-board Aspen backrest for added comfort
- Integrated LED strips beneath the backrest
- EPDM roof membrane designed for outdoor installation
Technical Specifications
Core construction, dimensions, materials, and design details for the Celto S and Celto M.
Celto S or Celto M — which size is right for you?
LEIL CELTO S
Compact Option- Best for: Smaller patios, gardens, and outdoor wellness areas where footprint is a priority
- Capacity: Designed for 2 people
- Exterior: Approximately 65" W x 56" D x 84" H
- Interior: Approximately 59" W x 50" D
- Why it works: The Celto S delivers the core Celto design in the smallest footprint, combining solid CLT construction, two-level Aspen seating, generous glazing, LED lighting, and an EPDM roof system.
LEIL CELTO M
More Spacious Option- Best for: Users who want the Celto design with additional interior and exterior space
- Capacity: Designed for 2 people
- Layout: Larger footprint than the Celto S
- Construction: Solid 60mm CLT walls, ceiling, and floor
- Why it works: The Celto M retains the compact architectural character of the Celto collection while providing a larger footprint for users who prioritize additional room and comfort.
CELTO COLLECTION
Shared Design- Construction: Solid 60mm CLT panel system
- Interior: Aspen benches and wide Aspen backrest
- Glass: Tempered bronze / smoked glass surfaces
- Lighting: LED strips beneath the backrest
- Roof: Self-adhesive EPDM roof membrane
Which Celto fits your space? Compare the footprints.
The Celto S and Celto M are designed for outdoor installation with compact Scandinavian-inspired footprints. The Celto S provides a smaller two-person layout, while the Celto M offers a wider interior and additional usable space. Compare the exterior and interior dimensions below to determine which model best fits your available installation area.
A streamlined DIY sauna build.
The Celto S and Celto M are supplied as DIY outdoor sauna kits with numbered and pre-cut components designed to simplify assembly. The kits include the structural CLT panels, glass components, Aspen interior elements, EPDM roof membrane, ventilation components, fasteners, and an illustrated assembly manual.
The Celto S is designed for efficient assembly, with the complete structure typically assembled in approximately four to six hours. Refer to the supplied manual for model-specific installation requirements.
What's in the Kit
The Celto kits include the major structural, interior, roofing, ventilation, hardware, and documentation components required to assemble the outdoor sauna.
- Numbered CLT wall panels
- Pre-cut CLT ceiling and floor panels
- Tempered glass door with black hardware
- Tempered glass side and front panels
- Aluminum door threshold and glass retaining components
- Pre-cut Aspen bench and backrest components
- Integrated LED backrest lighting channel
- EPDM roof membrane, pre-cut to size
- Ventilation components
- Complete fastener and screw set
- Illustrated assembly manual with parts diagram
Installation Steps
Prepare the Installation Area
Prepare a stable, level outdoor surface suitable for supporting the sauna. Ensure the installation area allows appropriate access around the structure for assembly, ventilation, and maintenance.
Unpack & Organize Components
Unpack the numbered components and organize the wall panels, floor and ceiling sections, glass elements, benches, roofing components, hardware, and ventilation parts according to the supplied assembly manual.
Assemble the CLT Structure
Assemble the floor and wall panels in the specified sequence, securing the CLT components with the supplied fasteners. Confirm that the structure remains level and properly aligned during installation.
Install Roof, Glass & Interior
Install the ceiling and EPDM roof membrane, followed by the tempered glass components, door hardware, Aspen benches, backrest, and interior lighting components.
Complete Heater & Electrical Installation
Heater and electrical installation should be completed according to the selected heater manufacturer's requirements and applicable local electrical codes. Electrical connections should be performed by a qualified electrician where required.
Final Inspection & First Use
Inspect the completed structure, verify the door and glass components, confirm ventilation openings are unobstructed, and check the heater and lighting installation before the first sauna session.
Choose your heater separately —
then plan the electrical connection around it.
The Celto S and Celto M do not have a single universal electrical specification because the heater and control configuration can vary. Electrical requirements should therefore be determined from the exact sauna heater selected for the installation. Heater wiring, breaker sizing, disconnects, grounding, and outdoor electrical protection must follow the heater manufacturer's requirements and applicable local codes.
From our warehouse to your driveway.
Your Celto sauna is shipped as a packaged DIY kit containing the structural panels, glass components, interior elements, roofing materials, hardware, and installation documentation. Delivery requirements can vary based on the final order and carrier, so confirm site access and delivery conditions before shipment.
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Good luck getting
Costco on the phone.
Most large outdoor purchases come with a phone tree. Ours comes with a person. When something goes sideways — a freight delay, a damaged panel, a missing component, or a question during installation — you contact us directly. We help coordinate with the manufacturer, work through shipping issues, and help you understand the next step. That's what we mean by boutique concierge service. It's the difference between buying a sauna and being supported through one.
Shipping Issue
If your shipment is delayed or something goes wrong in transit, we help coordinate with the carrier and manufacturer to keep the process moving.
Damaged Component
If a panel, glass component, or other part arrives damaged, we help document the issue and coordinate the appropriate next steps.
Manufacturer Support
When manufacturer assistance is needed, we help facilitate communication so you don't have to navigate the entire process alone.
Installation Questions
Have a question about the kit, components, or installation process? Contact us and we'll help point you toward the correct information.
We're not just here to process the order. We're here to help you get from delivery to a finished outdoor sauna with confidence.
Call (877) 689-4898Designed for outdoor installation. Built around solid CLT construction.
The Leil Celto S and Celto M are purpose-designed outdoor sauna structures combining solid 60mm CLT panels, tempered glass, Aspen interior components, ventilation openings, and an EPDM roof membrane. Their compact architectural design makes them suitable for outdoor wellness spaces where both appearance and efficient use of space matter.
The walls, ceiling, and floor use substantial CLT panels, creating the primary structural enclosure for the Celto outdoor sauna.
Generous tempered-glass areas create a bright interior while giving the sauna its distinctive modern architectural appearance.
The CLT ceiling incorporates a self-adhesive EPDM roof membrane designed to provide an outdoor protective layer above the sauna structure.
Two-level Aspen benches and a wide one-board Aspen backrest provide a clean, natural interior seating system.
Ventilation openings are incorporated into the sauna design to support airflow during operation.
The Celto S provides a particularly compact footprint, while the Celto M offers additional space for users who want a larger version of the same design.
Solid construction outside. Natural Aspen comfort inside.
The Celto collection combines a substantial CLT structural system with natural Aspen interior components. Solid 60mm CLT panels form the walls, ceiling, and floor, while Aspen is used for the two-level benches and wide backrest. Tempered glass and an EPDM roof membrane complete the outdoor-oriented construction.
60mm CLT — Structural System
The Celto S and M use solid CLT panels for the walls, ceiling, and floor. The approximately 60mm panel thickness provides the substantial structural enclosure used throughout the sauna.
Aspen — Interior Seating
Aspen is used for the two-level bench system and wide one-board backrest, providing a natural wood interior finish designed specifically around sauna seating and comfort.
Tempered Glass — Modern Exterior
Tempered glass is used for the windows and door, with bronze or smoked glass providing the Celto collection with its distinctive warm and contemporary appearance.
EPDM — Roof Protection
A self-adhesive EPDM membrane covers the CLT ceiling, providing the roof's weather-protective layer for outdoor installation.
Open the crate. The major components are ready for assembly.
The Celto S and Celto M are supplied as DIY outdoor sauna kits with numbered structural components, pre-cut interior elements, tempered-glass components, roof membrane, ventilation parts, fasteners, and an illustrated assembly manual. The exact component dimensions vary between the S and M models.
60mm CLT Structural Kit
Numbered CLT wall panels plus pre-cut ceiling and floor panels form the main structure of the Celto outdoor sauna.
Heater Configuration
The heater is selected separately based on the desired configuration. Electrical requirements should be confirmed from the exact heater model before installation.
Aspen Bench & Backrest System
Two-level Aspen seating with a wide one-board backrest provides the primary interior seating arrangement.
Hardware & Fasteners
The kit includes the required nails, wood screws, bench screw set, glass retaining components, and other dedicated installation hardware.
Glass Door & Panels
Tempered glass door and side/front glass panels provide the Celto's open appearance, with black hardware completing the door system.
Assembly Manual
An illustrated assembly manual with a parts diagram guides the installation of the numbered sauna components.
Frequently Asked Questions
Everything you need to know before choosing between the Leil Celto S and Celto M.
Manuals & Resources
Assembly documentation and product resources for the Leil Celto outdoor sauna collection.
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Choose your Celto.
Then make it yours.
Choosing between the compact Celto S and the larger Celto M? Call us and we'll help you select the right model for your space.
