If you have decided to put a sauna at the bottom of the garden, the next question is almost always about shape. A barrel sauna and a cube sauna can cost broadly the same, use the same Finnish timber and take the same Harvia heater — yet they behave quite differently once they are standing on a British lawn. This guide compares the two honestly, so you can choose the shape that suits your garden rather than the one that simply photographs well.
Why the Shape Actually Matters
A sauna is, in practical terms, a volume of air you have to heat and then keep hot. The curved walls of a barrel bring the ceiling down close to the benches, so there is less dead air above your head and the cabin reaches temperature quickly for its seating capacity. A cube gives you straight walls, full headroom at the door and a more usable floor plan — at the cost of a slightly larger volume to heat for the same number of people.
Everything else — insulation, cladding thickness and heater output — still matters more to your running costs than shape does. But the shape decides how the sauna feels inside, where it will physically fit, and how easily two or three people can move around without climbing over each other.
The Barrel Sauna: Traditional, Quick to Heat, Space-Efficient
The classic round barrel is the shape most people picture. Rain runs straight off the curve rather than sitting on a flat roof, the profile is naturally strong, and the compact air volume means a shorter wait between switching on and sitting down.
- Best for: smaller gardens, couples and families of three to four, buyers who want the traditional Nordic look.
- Trade-off: headroom is limited at the sides, so you sit rather than stand, and the curved walls make the very ends of the cabin less usable.
- Example: our AURA 130 barrel sauna for 3–4 people starts at £2,190, which makes it one of the most affordable ways into a proper outdoor sauna.
The Cube Sauna: Headroom, Benches and Glass
Cube saunas — including the soft-cornered “rounded cube” profile that has become popular over the past few years — give you vertical walls where the benches sit. That means proper L-shaped benching, room to stand up when you come in, and far more scope for glass.
- Best for: four to eight people, entertaining, and anyone who wants a panoramic view out over the garden while they sit.
- Trade-off: a larger footprint on the ground and a slightly bigger volume of air to heat.
- Examples: the ICON 220 for 4–6 people at £3,390, the ICON 400 for larger groups at £6,190, or the fully glazed S-KLAR W1 with a panoramic front at £9,290 for 6–8 people.
Practicalities in a UK Garden
Three things decide this more often than aesthetics do:
- Access. Cabins arrive palletised or in sections, so measure your side gate and the route to the back garden before you order. A barrel's round profile is often easier to manoeuvre through a tight passage than a wide cube.
- The base. Both shapes need a level, load-bearing base — paving, decking or a concrete pad. A cube distributes its weight over a larger rectangle; a barrel sits on cradles, so the ground beneath those cradles must be genuinely flat.
- Weather and siting. British rain is relentless, which is where the barrel's self-shedding curve earns its keep. On a cube, check that the roof detail and the overhang are properly specified. Either way, leave room to walk around the cabin for maintenance.
Most garden saunas fall under permitted development as an outbuilding, but rules differ for listed buildings and conservation areas, so it is worth a quick call to your local planning authority before you place the order.
What the Research Says About Regular Sauna Use
Shape does not change the physiology — frequency does. In a Finnish cohort of 2,315 middle-aged men followed for a median of around 21 years, published in JAMA Internal Medicine, more frequent sauna bathing was associated with lower rates of fatal cardiovascular events and all-cause mortality compared with a single session per week (Laukkanen et al., 2015). This is an observational association rather than proof of cause and effect, but it does point to something practical: the sauna you actually use four times a week is worth more than the one you admire twice a month. Choose the shape and size you will genuinely heat up on a wet Tuesday in February.
So Which Shape Wins?
- Choose a barrel if the garden is small, the budget is tight, you are buying for two to four people, and you like the traditional look.
- Choose a cube if you want to seat five or more, entertain, stand up comfortably inside, or fit a large glazed front facing the garden.
- Either works year-round in the UK climate, provided the cabin is properly insulated and the heater is matched to the cabin volume. If you are still weighing up the heater itself, our guide to wood-fired versus electric outdoor saunas covers that decision, and the 2026 garden sauna buyer's guide covers the rest.
Ready to Choose Your Shape?
Every SAUNADO sauna is Finnish-made, fitted with a genuine Harvia heater and delivered DDP to your UK address — import duty and VAT are handled before it reaches you — with a full manufacturer's warranty.
Browse barrel saunas: https://saunado.eu/en/collections/sauny-beczki
See the full range: https://saunado.eu/en/collections/all
Not sure which shape fits your garden? Send us your measurements at sales@saunado.eu and we will tell you honestly what will and will not work.