3 Person Outdoor Sauna Cabins & Barrels

A 3 person outdoor sauna offers the perfect middle ground: spacious enough for shared sessions, yet compact enough to fit harmoniously into a garden or terrace. 

Whether you choose a design-led outdoor cabin such as the IGNIS® or URSA®, or the timeless charm of a traditional barrel sauna, each model is crafted from Nordic timbers and refined with details that bring authentic Finnish heat bathing into your daily rhythm of outdoor wellness. Together, they form part of Finnmark’s complete range of outdoor saunas – a collection where every design is built for comfort, resilience, and true relaxation.

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IGNIS® & URSA®: Luxury 3 Person Outdoor Sauna Cabins

IGNIS® and URSA® represent two distinct expressions of a 3 person outdoor sauna cabin, each combining architectural elegance with authentic Finnish performance.

  • IGNIS® is the cabin for those who value practicality woven into modern architecture. Its extended roofline offers sheltered entry and a discreet spot for towels or kindling, while its clean silhouette sits naturally against contemporary gardens or terraces. Inside, two-tier benches allow you to explore both the invigorating intensity of the upper bench and the gentler warmth below, with clever storage keeping the space clear and uncluttered.

  • URSA®, by contrast, is about immersion in light and landscape. With a full-glass façade, it frames your garden as part of the experience, filling the cabin with natural brightness by day and a glowing atmosphere by night. Integrated LED backlighting accentuates the smooth Thermo Aspen or Thermo Alder interiors, while the two-tier layout creates a lounge-like space for shared sessions.

Both cabins are paired with Finnish HUUM heaters, available in electric or wood-burning options, chosen for their stone capacity and soft, even steam. The difference lies in how you want your sauna to feel: IGNIS® brings considered functionality to daily life, while URSA® transforms each session into an architectural event.

Explore Ignis Explore Ursa

The 3 Person Garden Sauna in Barrel Form

Where cabins emphasise architectural form, the 3 person garden sauna in a barrel design celebrates tradition. Its rounded profile creates efficient air circulation so the sauna heats rapidly and retains warmth evenly. For those with limited space, the compact footprint makes it easy to integrate into gardens, terraces, or even tucked-away corners of outdoor retreats.

Crafted from thermally modified Nordic spruce, the barrel is built to withstand the shifting seasons. The thermal treatment strengthens the timber, deepens its rich tones, and ensures durability against rain, frost, and sunlight. The result is a structure that not only performs outdoors, but weathers beautifully with age.

Inside, the arched benches follow the natural curve of the barrel, creating a cocooning environment for up to three bathers. The design encourages closeness, making it ideal for couples, small families, or friends who want to share the ritual.

For those who want a sauna that feels timeless, compact, and deeply connected to tradition, the 3 person barrel sauna offers a rustic yet refined retreat – a design that has been trusted in Finland for generations, now crafted for your garden.

Barrel Saunas
  • Thermo Wood Barrel Sauna - Micro (2 Person) Barrel Sauna | Finnmark Sauna
  • Thermo Wood Barrel Sauna - Small with Relaxation Terrace (2 - 4 Person) Barrel Sauna | Finnmark Sauna
  • Thermo Wood Barrel Sauna - Regular with Relaxation Terrace (2 - 4 Person) Barrel Sauna | Finnmark Sauna
  • Thermo Wood Barrel Sauna - Micro (2 Person) Barrel Sauna | Finnmark Sauna

The Final Layer of Luxury in Every Session

The experience of a Finnmark sauna is shaped not only by heat and timber, but also by the thoughtful details that make each session your own. With carefully chosen sauna accessories, our 3 person saunas evolve beyond cabins into personalised retreats.

Time flows differently in the sauna, and with a hand-crafted sand timer you can move through each session at a gentle, natural pace. Scents and oils infuse the heat with subtle notes of birch, pine, or eucalyptus, transforming warmth into heat therapy that soothes both body and mind. For those who seek deeper immersion, our sauna fountains and diffusers release fragrance into the air with quiet elegance, elevating the ambience to spa-like serenity.

Comfort is found in the details. Premium pillows, seat covers, and discreet headrests soften the benches, extending the pleasure of longer sessions while protecting the timber. Each piece is designed with durability and ease of care in mind, ensuring your sauna remains as practical as it is indulgent.

Together, these finishing touches enrich every moment spent within your 3 person external sauna. They invite you to slow down, and to create a private outdoor leisure space where modern design and timeless ritual meet.

FAQs

Is a 3 person outdoor sauna suitable for small gardens?

Yes. A 3 person outdoor sauna, whether in cabin or barrel form, is designed to fit comfortably into modest outdoor spaces. Cabins like IGNIS® and URSA® integrate seamlessly into terraces or courtyards, while barrels offer a rounded profile that makes efficient use of garden space. Both provide enough room for family or friends while remaining space-efficient.

How energy efficient is a 3 person outdoor sauna?

Both cabins and barrels are engineered with efficiency in mind. Thermally modified Nordic timbers provide excellent insulation in cabins, while the curved barrel form heats rapidly and retains warmth effectively. Paired with premium sauna heaters designed for performance and longevity, it allows you to enjoy authentic Finnish heat therapy without excessive running costs.

How long does it take to heat a 3 person garden sauna?

Heating times for a 3 person garden sauna depend on several factors: the heater you choose, the season, and where the sauna is positioned. In warmer months, it may be ready in under an hour, while colder weather or exposed placements can extend the process. Electric heaters offer the convenience of quick, consistent heating, while wood-burning stoves take longer but provide the timeless atmosphere of a crackling fire and the natural aroma of burning wood.

Can a 3 person external sauna be used all year round in the UK climate?

Yes, a 3 person external sauna is built for year-round use, even in the changing British climate. Thermally treated Nordic timber ensures the structure remains stable through rain, frost, and summer heat. To keep the exterior looking its best, applying a breathable protective oil or stain once a year is recommended, especially in coastal or exposed locations. With minimal care, your sauna remains a reliable retreat for outdoor relaxation throughout every season.

Are 3 person garden saunas suitable for Airbnb or holiday rentals?

Absolutely. 3 person outdoor saunas are a highly desirable feature for Airbnb and holiday properties, offering guests a unique and memorable wellness experience. Their compact design makes it practical to install, while durable thermo-treated timbers ensure it withstands regular use. Adding a sauna not only elevates the comfort of your accommodation but can also increase its appeal and value in a competitive rental market.

Do I need planning permission for a 3 person garden sauna?

In most cases, a 3 person garden sauna falls within permitted development rights, similar to a shed or garden outbuilding. However, local regulations can vary, and properties in conservation areas or with listed status may face additional restrictions. For complete reassurance, it’s best to check with your local planning authority before installation. Finnmark’s specialists can also offer guidance to ensure your sauna is placed appropriately and compliantly within your garden.

We would love to hear from you.

If you'd like to talk about your sauna plans, or simply want some free help and advice, send us a message below or call us on+44 (0)20 8050 2895