Why Choose a Cube Sauna?
Cube saunas represent the perfect solution for British homeowners who want an authentic Finnish sauna experience without sacrificing valuable space. The innovative square barrel design maximises interior room whilst maintaining a remarkably compact footprint, making them ideal for smaller gardens, spare rooms, basements, or converted garages where traditional rectangular saunas simply won't fit.
The cube shape isn't just about space efficiency—it fundamentally improves heat circulation. The curved walls encourage optimal air flow, distributing heat more evenly throughout the interior and creating a more comfortable sauna session with faster heating times compared to traditional rectangular designs.
The Thermally Modified Difference
Every Finnmark cube sauna is built with thermally modified timber—a premium material that's transformed through heating to 200°C in a controlled environment. This process permanently alters the wood's cellular structure, delivering exceptional resistance to decay, weathering, and warping that untreated timber simply cannot match.
Unlike standard timber saunas that require annual treatments and may need replacing within 5-7 years, thermally modified wood maintains its structural integrity for decades. The naturally darker, richer colour ages beautifully without fading to grey, eliminating the maintenance burden whilst creating a sophisticated aesthetic that complements both contemporary gardens and traditional British homes.
This isn't just marketing—it's a fundamental material advantage. The thermal modification process reduces the wood's ability to absorb moisture by up to 50%, making it inherently more stable in the demanding environment of a sauna where temperatures regularly exceed 80°C and humidity fluctuates dramatically.
Indoor or Outdoor Installation
Our cube sauna collection includes both indoor and outdoor variants, each specifically engineered for its intended environment. The indoor model features integrated ventilation designed for spare rooms and basements, with a roof kit included should you wish to relocate outdoors in future. The outdoor variant is built for year-round British weather, with weather-resistant construction and bitumen roof shingles as standard.
Both models accommodate 1-2 people comfortably with two-tier thermally modified aspen benches and feature striking 8mm tempered glass doors and front walls. The generous 121cm bench length provides ample room for reclining, whilst the 221cm height creates an open, airy interior that never feels cramped despite the compact external dimensions.
Indoor Installation Considerations
Indoor cube saunas require a level, solid floor capable of supporting 450kg—typically concrete, reinforced timber joists, or solid flooring. You'll need minimum room dimensions of 175cm × 165cm including the essential 150mm clearance from walls for proper air circulation and heat dissipation. Adequate ventilation is critical: the room must have either natural ventilation through a window or air vent, or mechanical extraction to maintain proper oxygen levels and remove moisture during use.
The 6kW electric heater requires a dedicated 32A circuit installed by a qualified electrician, hardwired directly without a plug connection. Most indoor installations are straightforward and comply with Building Regulations, though we recommend consulting with a qualified professional to ensure your specific installation meets all requirements for your property type and location.
Outdoor Installation Requirements
Outdoor cube saunas need a level base of concrete, paving slabs, or crushed stone measuring minimum 150cm × 140cm. The site must be free from standing water with adequate drainage to prevent water pooling around the base. The same electrical requirements apply—a dedicated 32A circuit installed by a qualified electrician.
In most cases, cube saunas fall under permitted development rights as they're under 2.5m high. However, we recommend verifying with your local planning authority, especially if you're in a conservation area, have a listed building, or restricted covenants apply to your property.
Complete Packages Ready to Install
Our cube saunas are available as complete packages including everything you need for an authentic Finnish sauna experience. Each complete package includes a Narvi NM 6kW electric heater—crafted in Finland with decades of expertise—and professional-grade sauna stones specifically selected for optimal heat distribution and retention.
The base unit includes 40mm thermally modified spruce frame and staves, two foundation beams, two-tier thermally modified aspen benches, 8mm tempered glass door and front walls, thermally modified aspen flooring duckboards, integrated ventilation valve, bitumen roof shingles (for outdoor use), two stainless steel frame bands, and complete assembly hardware with detailed instructions.
Designed for straightforward DIY assembly, most customers complete installation in a weekend with basic tools. No specialist equipment required—just patience, a helping hand, and our comprehensive step-by-step instructions.
Authentic Sauna from Finland Certification
Finnmark Sauna holds the distinction of being the UK's first member of "Sauna from Finland", a prestigious certification that guarantees authentic construction standards honouring centuries of traditional Finnish craftsmanship. This isn't simply a badge—it's a commitment to quality that influences every decision we make, from timber selection to hardware specifications.
We stock only premium brands including HUUM, Narvi, Tulikivi, IKI, Helo, and Kastor—names that represent the pinnacle of Finnish sauna engineering. We never compromise on quality, never cut corners with inferior materials, and never stock brands that don't meet our exacting standards.
Perfect For
Cube saunas are ideal for couples seeking a private wellness retreat at home, homeowners with limited garden or indoor space, first-time sauna buyers who want proven quality without overwhelming choice, year-round wellness enthusiasts, and property developers adding luxury amenities to residential or commercial spaces.
If you're new to sauna ownership, the compact cube design offers an accessible entry point that doesn't compromise on the authentic Finnish sauna experience. The smaller size means lower running costs, faster heating times, and easier maintenance, whilst still delivering the profound health and wellness benefits that regular sauna use provides.
Explore Our Full Sauna Collection
Beyond our cube saunas, we offer an extensive range of authentic Finnish saunas to suit every space and preference. Browse our popular barrel saunas for classic outdoor installations, explore our complete outdoor sauna range for year-round garden use, or discover our indoor sauna collection for dedicated wellness rooms.
Enhance your sauna experience with our curated selection of sauna accessories, upgrade or replace your heating with our range of premium electric and wood-fired heaters, or ensure optimal performance with high-quality sauna stones designed for superior heat retention.
Expert Support from Durham
Operating from Durham with a dedicated team of 40 sauna specialists, we're here to guide you through every step of your sauna journey. Whether you need advice on selecting the right model, technical support during installation, or ongoing maintenance guidance, our team brings decades of collective experience to ensure your complete satisfaction.
We're a family business founded by brothers Jake and Max Newport—The Sauna Twins—who are passionate about bringing authentic Finnish sauna culture to British homes. Every recommendation we make, every product we stock, and every piece of advice we offer comes from genuine expertise and a deep commitment to quality.
