Modular Sauna Kalle XL

Large-group sauna with black exterior

Price

£16,195 inc VAT & Delivery Included

Complete DIY Assembly Kit

Every Order Plants 5 Trees

Professional Installation

Comprehensive Warranty

Free UK Mainland Delivery

Choose your installation

Choose your timber colour

Natural Spruce

Choose your roof shingles

Terracotta

Umber

Forest

Graphite

Onyx

Choose your sauna heater

Buy together
Modular Outdoor Sauna Kalle XL — 8–10 Person Painted Spruce Insulated Sauna, Factory-Built, 10.7m²
Modular Sauna LED Light Strips — Bench Lighting Kit, 1 Room

Choose your add-ons

About

Big sauna, manageable build. Kalle XL covers 10.7m², the largest in the modular range, with pre assembled Spruce sections doing the heavy lifting before the structure ever reaches the garden. What would be a substantial panel by panel build instead becomes a straightforward fitting together process on site. Built for serious group wellness spaces without the extended construction timeline that scale usually demands. The Spruce structure is supplied with its exterior factory-finished in painted black.

Natural Nordic Spruce

Natural Nordic Spruce

Built for UK Weather

Built for UK Weather

Everything You Need to Install

Everything You Need to Install

Designed for Fast Heat-Up

Designed for Fast Heat-Up

Specification

  • Shape: Rectangular
  • Accommodates: 8-10 People
  • Footprint: 600 x 225 cm
  • Max Height: 250 cm
  • Floor Area: 10.7 m²
  • Wall Thickness: 180 mm
  • Material: Spruce
  • Main Door: 90 x 190 cm
  • Window 1: 230 x 148 cm
  • Window 2: 55 x 148 cm
  • Glazing: Tempered Glass
  • Assembly: Factory assembled
  • Insulated: Yes
  • Design Note: Only factory assembled and insulated; 7-degree roof pitch
  • Power Supply: Single or Three Phase
  • Heater Compatibility: Electric & Wood-Fired

Designed around your ritual

Full Glass Back Window

Full Glass Back Window

Bring the outdoors in. A full glass rear window fills the sauna with natural light and opens up wider scenic views.
Half Moon Back Window

Half Moon Back Window

Privacy meets natural light. A half-moon rear window creates a softer, brighter feel while keeping more enclosed wall space.
Full Glass Front Barrel

Full Glass Front Barrel

Turn every session outward. Full front glazing opens the barrel sauna to natural light and uninterrupted outdoor views.
Full Glass Front Cube

Full Glass Front Cube

Modern design, open views. Full-height front glazing creates a brighter, cleaner space with a sharper architectural finish.
LED Lighting Kits

LED Lighting Kits

Set the perfect mood. Integrated LED lighting creates warmth and atmosphere, transforming the sauna experience day or night
Bluetooth Speakers

Bluetooth Speakers

Soundtrack your downtime. Built-in Bluetooth speakers bring music, podcasts, and guided sessions straight into your sauna.
Quality Accessories

Quality Accessories

Complete the experience properly. Practical finishing touches that improve comfort, convenience, and the overall sauna ritual.
Premium Thermowood

Premium Thermowood

Built to age beautifully. Thermowood offers a richer finish, stronger durability, and better long-term performance.
Building serious group sauna capacity without committing to a lengthy construction project matters most for households or small businesses who want the wellness benefits of sauna bathing available to more people, more often. The core physiological effects, improved circulation, reduced muscle tension, and a cardiovascular response comparable to light exercise, remain consistent regardless of sauna size, but the practical reality is that a sauna which actually gets built and operational quickly is one that starts delivering those benefits sooner.

For glamping operators and holiday lets, offering genuine group sauna capacity as part of a guest experience taps into well-documented social benefits of shared sauna use beyond the heat itself. Group sauna bathing, central to wellness culture across Finland and the Baltic states, supports both physical recovery and a more relaxed, connected social experience, something increasingly valued by guests seeking a genuine wellness amenity rather than a token feature.

The insulated, factory-built construction also means consistent, reliable heat retention even at this larger scale, which matters for group use since temperature stability can otherwise be affected by more frequent door opening and a larger volume of air to heat. A sauna built to handle eight to ten people reliably, without an extended build process standing between the decision to invest and actually being able to use it, removes much of the friction that might otherwise delay a household or business from establishing a genuine regular sauna practice.
Delivered flat-packed for self-assembly, with free UK mainland delivery on qualifying orders. The larger Cube format requires a little more assembly time than the smaller Icon models, so we recommend allowing a weekend and having a second person to help. A solid, level base and suitable delivery access are required.

For a complete setup, select Professional Installation and choose your preferred date, allowing for the stated production lead time. We’ll then arrange the installation around your requirements, including any additional preparation or works needed to accommodate your sauna where possible.

Electric sauna heaters require a suitable dedicated electrical supply and are not simply plug-and-play. The power requirements depend on the heater's output and the electrical supply available at the property.

Smaller heaters may be suitable for a 230V single-phase supply, while larger or more powerful heaters can require a 400V three-phase supply. Single-phase power uses one electrical phase, whereas three-phase power distributes the load across three phases and is better suited to higher-powered equipment.

The correct supply will depend on the specific heater you choose, so the heater's electrical requirements should always be checked before installation.

Sauna heaters will normally need to be hard-wired into a correctly rated dedicated circuit with the appropriate cable, isolation and electrical protection. They should not be connected using a standard household plug or extension lead.

The final electrical connection should be completed by a suitably qualified electrician in accordance with the heater manufacturer's instructions and applicable electrical regulations. This is important for both safety and reliable operation of the heater.

If you're based in the Leicestershire area, we can arrange the electrical installation of your sauna heater for an additional fee. Please speak to our team if you'd like this included with your sauna.

Wood-fired sauna heaters do not require an electrical supply for heating, but they do require the correct installation of the stove, chimney, flue and surrounding heat protection.

The stove must be positioned according to the manufacturer's required safety distances from timber walls, benches and other combustible materials. Depending on the stove and sauna design, suitable heat shields or other non-combustible protection may also be required.

The floor beneath and immediately around the stove may also require suitable non-combustible protection, particularly where there is a risk of embers or hot material falling from the stove.

A suitable chimney and flue system must be installed to safely carry smoke and combustion gases outside the sauna. Where the flue passes through the roof, the correct insulated chimney components, roof flashing and heat-resistant protection should be used.

Correct ventilation is also important. A wood-fired stove requires an adequate supply of combustion air, while the sauna itself needs sufficient airflow to provide fresh air, circulate heat and allow moisture to escape.

When choosing the position of an outdoor wood-fired sauna, you should also consider where the chimney will discharge in relation to your house, neighbouring properties, windows, boundaries and outdoor seating areas.

Any applicable local requirements should be checked before installation, particularly where chimney positioning, smoke control or other restrictions may apply.

At this scale, the modular Kalle XL benefits from a slightly more organised maintenance approach simply due to the larger surface area involved. After every session, leave the door open for twenty to thirty minutes to let the heat room dry out fully, preventing mould and staining regardless of the sauna's size. Wipe benches down once cooled, and sand the interior lightly once or twice a year wherever group use creates the most contact wear.

Windows need only a standard glass cleaner and soft cloth. Check door and window seals each season, and given the larger structure and 7-degree roof pitch, periodically inspect the roofline for any debris build-up that could affect water shedding, particularly after autumn leaf fall or stormy weather.

Externally, treat the spruce exterior with a wood treatment every two to three years, budgeting proportionally more time for this larger structure. Keep the full base perimeter clear of debris and standing water, checking drainage around the building's full footprint given its scale. For commercial installations seeing heavier or more frequent use, consider a more regular seasonal inspection schedule than a private household sauna would need.
This sauna comes with a 5 year warranty for residential use and 2 years for commercial use, covering structural timber, glazing, and hardware. Valid claims are assessed case by case, and we'll supply replacement parts wherever possible rather than the whole sauna.
Production takes 10-12 weeks, plus 1-2 weeks dispatch time for pallet haulage. This sauna is delivered as pre-assembled wall sections rather than fully flat packed. Free UK mainland shipping applies to orders over £500 covering up to one double pallet (2.4m x 1.2m x 2.2m) or two single pallets (1.2m x 1.2m x 2.2m). Given this model's size and weight, additional pallet charges may apply and will be quoted separately based on your postcode, and forklift unloading may be required as it exceeds normal tail-lift limits (1000kg). Please have a solid base, clear access, and suitable unloading space ready before delivery, with help on site if needed. Pallet deliveries are kerbside only, and you're responsible for moving goods onto your property.
Health Benefits
Assembly & Installation
Delivered flat-packed for self-assembly, with free UK mainland delivery on qualifying orders. The larger Cube format requires a little more assembly time than the smaller Icon models, so we recommend allowing a weekend and having a second person to help. A solid, level base and suitable delivery access are required.

For a complete setup, select Professional Installation and choose your preferred date, allowing for the stated production lead time. We’ll then arrange the installation around your requirements, including any additional preparation or works needed to accommodate your sauna where possible.
Electric Heater Setup

Electric sauna heaters require a suitable dedicated electrical supply and are not simply plug-and-play. The power requirements depend on the heater's output and the electrical supply available at the property.

Smaller heaters may be suitable for a 230V single-phase supply, while larger or more powerful heaters can require a 400V three-phase supply. Single-phase power uses one electrical phase, whereas three-phase power distributes the load across three phases and is better suited to higher-powered equipment.

The correct supply will depend on the specific heater you choose, so the heater's electrical requirements should always be checked before installation.

Sauna heaters will normally need to be hard-wired into a correctly rated dedicated circuit with the appropriate cable, isolation and electrical protection. They should not be connected using a standard household plug or extension lead.

The final electrical connection should be completed by a suitably qualified electrician in accordance with the heater manufacturer's instructions and applicable electrical regulations. This is important for both safety and reliable operation of the heater.

If you're based in the Leicestershire area, we can arrange the electrical installation of your sauna heater for an additional fee. Please speak to our team if you'd like this included with your sauna.

Wood-Fired Heater Setup

Wood-fired sauna heaters do not require an electrical supply for heating, but they do require the correct installation of the stove, chimney, flue and surrounding heat protection.

The stove must be positioned according to the manufacturer's required safety distances from timber walls, benches and other combustible materials. Depending on the stove and sauna design, suitable heat shields or other non-combustible protection may also be required.

The floor beneath and immediately around the stove may also require suitable non-combustible protection, particularly where there is a risk of embers or hot material falling from the stove.

A suitable chimney and flue system must be installed to safely carry smoke and combustion gases outside the sauna. Where the flue passes through the roof, the correct insulated chimney components, roof flashing and heat-resistant protection should be used.

Correct ventilation is also important. A wood-fired stove requires an adequate supply of combustion air, while the sauna itself needs sufficient airflow to provide fresh air, circulate heat and allow moisture to escape.

When choosing the position of an outdoor wood-fired sauna, you should also consider where the chimney will discharge in relation to your house, neighbouring properties, windows, boundaries and outdoor seating areas.

Any applicable local requirements should be checked before installation, particularly where chimney positioning, smoke control or other restrictions may apply.

Cleaning & Care
At this scale, the modular Kalle XL benefits from a slightly more organised maintenance approach simply due to the larger surface area involved. After every session, leave the door open for twenty to thirty minutes to let the heat room dry out fully, preventing mould and staining regardless of the sauna's size. Wipe benches down once cooled, and sand the interior lightly once or twice a year wherever group use creates the most contact wear.

Windows need only a standard glass cleaner and soft cloth. Check door and window seals each season, and given the larger structure and 7-degree roof pitch, periodically inspect the roofline for any debris build-up that could affect water shedding, particularly after autumn leaf fall or stormy weather.

Externally, treat the spruce exterior with a wood treatment every two to three years, budgeting proportionally more time for this larger structure. Keep the full base perimeter clear of debris and standing water, checking drainage around the building's full footprint given its scale. For commercial installations seeing heavier or more frequent use, consider a more regular seasonal inspection schedule than a private household sauna would need.
Warranty
This sauna comes with a 5 year warranty for residential use and 2 years for commercial use, covering structural timber, glazing, and hardware. Valid claims are assessed case by case, and we'll supply replacement parts wherever possible rather than the whole sauna.
Delivery
Production takes 10-12 weeks, plus 1-2 weeks dispatch time for pallet haulage. This sauna is delivered as pre-assembled wall sections rather than fully flat packed. Free UK mainland shipping applies to orders over £500 covering up to one double pallet (2.4m x 1.2m x 2.2m) or two single pallets (1.2m x 1.2m x 2.2m). Given this model's size and weight, additional pallet charges may apply and will be quoted separately based on your postcode, and forklift unloading may be required as it exceeds normal tail-lift limits (1000kg). Please have a solid base, clear access, and suitable unloading space ready before delivery, with help on site if needed. Pallet deliveries are kerbside only, and you're responsible for moving goods onto your property.
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — painted — angle view 1

Serious group capacity, built quickly

Modular Sauna Kalle XL is the largest in the Kalle line, with a 10.7 square metre footprint that puts it among the bigger structures in the entire range while retaining the pre assembled modular construction that defines the series throughout. Solid spruce wall sections are built and finished before reaching site, which keeps installation considerably more manageable than a structure of this size would otherwise involve if built panel by panel from scratch.

At this scale, the modular approach genuinely earns its place, since building a cabin of comparable size panel by panel would be a substantial undertaking for even an experienced self builder. Kalle XL instead arrives largely ready to assemble, with the heavy lifting of construction already done before it gets anywhere near the garden, leaving a more straightforward fitting together process on site rather than a full build from raw materials.

The result is a sauna capable of handling proper group use, with the practical advantages of modular construction scaling well as the size increases rather than becoming proportionally harder to manage. For anyone planning a serious outdoor wellness space who wants the size of a large multiroom build without the extended construction timeline that size usually implies, Kalle XL is built to bridge that exact gap. The Spruce structure is supplied with its exterior factory-finished in painted black.
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — painted — lifestyle
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — painted — angle view 2
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — painted — lifestyle
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — painted — lifestyle
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — painted — lifestyle
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — lifestyle photo 1
Modular Outdoor Sauna Kalle XL — Painted Black Spruce, 10.7m² — lifestyle photo 2

From Your Sketch
To Reality ✏️

A sauna built entirely around your space, your ideas and how you want it to feel.

Send us your hand-drawn sketches, and we’ll turn them into detailed CAD designs ready to bring your vision to life.

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Bespoke wood-fired sauna and wellness space
Free Mainland UK Delivery Naturally Insulating Spruce Consistent Warmth Year Warranty Year-Round Use Heats Up Fast
Free Mainland UK Delivery Naturally Insulating Spruce Consistent Warmth Year Warranty Year-Round Use Heats Up Fast
Free Mainland UK Delivery Naturally Insulating Spruce Consistent Warmth Year Warranty Year-Round Use Heats Up Fast
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Built on Tradition. Perfected for Today.

Classic Scandinavian design, refined with premium materials, precise craftsmanship and enduring performance.

Designed to Heat Efficiently

Every curve has a purpose, helping your sauna reach temperature faster while delivering an even, enveloping warmth.

Crafted from Exceptional Thermowood

Heat-treated for durability and stability, our premium timber is chosen for its natural beauty and long-lasting performance.

Premium Tempered Safety Glass

Our premium tempered glazing delivers a refined finish, excellent durability and complete confidence in every sauna.

Frequently Asked Questions

5-Year Guarantee

5-Year Guarantee

Built for years of wellness and relaxation

Free UK Mainland Delivery

Free UK Mainland Delivery

Free delivery throughout England, Wales, and Scotland.

Expert Help, When You Need It

Expert Help, When You Need It

Friendly specialist support before and after your purchase.

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