Cube Saunas
Prisma
3.0 m cube · 6 people
Model SQR3T, the flagship cube
From £4,790
Includes UK delivery and an electric heater. Installation by our team £990, or arrives flatpack with simple instructions.
Model SQR3T: our largest cube at three metres, an evening room as much as a sauna, seating six comfortably.
The full standing height and squared walls make it the most spacious sauna we build. Built exclusively in 40 mm Thermowood with an M80 8kW electric heater fitted and tested. Assembled or flat-pack. Professional installation available.
Configure your sauna
What's included
- Premium Thermowood construction, 40 mm body
- Thermowood benches
- Brown tempered glass door
- Bitumen shingle roof
- Sauna heater
- Sauna stones (where applicable)
- Stainless steel support hoops
- Sauna bucket and ladle, interior lighting and bench oil finish included as standard
A complete package with no hidden extras: everything you need to install and enjoy your sauna arrives with it.
Base, electrics and expert advice
Foundation bases and electrical connection quoted in-house, from as little as £200. Slabs, concrete pads or ground screws, plus a Part P registered electrician to make the final connection, one team, one point of contact.
Specifications
- Capacity
- ~6 people
- Body
- Thermowood, 40 mm, standard on every outdoor sauna
- Benches
- Premium Thermowood
- Door
- Brown tempered glass
- Roof
- Bitumen shingle, colour of your choice
- Heating
- Harvia Top Steel M80 8 kW included, wood burner +£500
- Hoops
- Stainless steel
- Assembly
- Flatpack with instructions, or installed by us for £990
- Origin
- Handcrafted in Estonia
Dimensions
- Model
- SQR3T
- Assembled size (L×W×H)
- 300 × 200 × 220 cm
- Steam room volume
- 9.4 m³
- Interior height
- 205 cm
- Weight
- ~780 kg
- Bench width
- 50 cm
- Heating time
- ~1 hour
Thermowood only
Every outdoor sauna we build is Thermowood
Every outdoor barrel sauna we build is made exclusively from Thermowood, timber modified at around 200°C using nothing but heat and steam. It costs us more than standard spruce, and we think it is the only material worth putting in a British garden.
01
Greater durability
Thermal modification hardens the timber all the way through, so it stands up to British weather year after year.
02
Resistant to rot and decay
Removing the resins and sugars leaves nothing for fungi and insects to feed on, without a drop of chemical treatment.
03
Dimensionally stable
Far less expansion and contraction through wet winters and hot summers, so staves stay tight and doors keep closing sweetly.
04
Low moisture absorption
Thermowood takes on a fraction of the water untreated softwood does, which is exactly what an outdoor sauna needs.
05
Better insulation
A lower thermal conductivity means the cabin heats faster and holds its heat for longer, using less energy.
06
Longer lifespan
Properly cared for, a Thermowood cabin comfortably outlasts a standard spruce one, the reason we no longer offer anything else.
Delivery
Delivered across mainland UK on a dedicated vehicle. Next-day delivery on everything we hold in stock; made-to-order pieces, panoramic glazing, non-standard roof colours, follow the production lead time we confirm with you. Our team handles offloading and positioning.
Installation
£990 for our own crew to position, assemble and commission on site, usually within a day, or take it as a flatpack with simple instructions. Base and electrician quoted on request.
Warranty
Five years on the cabin structure, two years on heaters, and lifetime technical support from our UK team.
Questions about this model
- Do I need planning permission for an outdoor sauna?
- In most cases, outdoor saunas are considered permitted development and do not require planning permission. However, this depends on several factors, including the size and height of the sauna, where it will be positioned, whether your property is listed or located within a conservation area, and any local planning restrictions that may apply. We always recommend checking with your local planning authority before placing an order if you are unsure. Our team is also happy to provide dimensions and technical information to help with any enquiries.
- What base do I need?
- A sauna should always be installed on a solid, level foundation to ensure long-term performance and stability. Suitable bases include concrete slabs, reinforced concrete pads, paving slabs on a compacted sub-base, resin-bound surfaces and suitable composite decking, depending on the model. The base should be completely level and capable of supporting the full weight of the sauna. If you don't already have a suitable base, we can arrange this for you before installation, giving you one point of contact throughout the entire process.
- How long does delivery take?
- Delivery times depend on the product and any customisations you choose. Our standard outdoor Thermowood saunas are typically delivered within 6–10 weeks. Anything we hold in stock can be sent on a next-day delivery. If you choose custom features such as panoramic windows or bespoke finishes, production times may be slightly longer as these components are manufactured to order. We'll keep you updated throughout production and provide a delivery date as soon as your sauna is ready.
- Do you install, and what does it cost?
- Yes. We offer professional installation throughout the UK. Our experienced installation team will assemble your outdoor sauna on site, ensuring everything is completed correctly and ready for use. Professional installation starts from £990.
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