4 person outdoor saunas
Best 4 person outdoor saunas in the UK (2026)
Four seats is where a sauna stops being a gadget and starts being the reason people come round. Complete cabins run £2,999 to £6,865, and the differences that matter are stove output, wall build and what delivery day actually involves. These are the five worth shortlisting.
Ranked on genuine seated capacity, stove output for the volume, what the price includes, and delivered UK cost.
The 5 best, ranked
Polar Recovery Sauna Cube
9.4out of 10
The Cube's 200cm × 196cm interior seats four along its L-shaped alder benches with room for a fifth, behind 45mm thermowood walls that hold their heat through a British winter. The 6kW Harvia Vega ships in the box, the door is tempered glass, and the whole cabin arrives flatpacked from Somerset in 3 to 4 weeks at £5,499.99.
Our verdict
For a family-size sauna the two numbers that matter are seats and delivered cost, and nothing ranked beats five seats for £5,499.99 with the stove already in it. The Vega's dedicated 32A supply is the one line the budget must carry beyond the ticket, plus a base. Four adults fit seated with headroom to spare; it takes the top spot here for the same reason it tops the main ranking.
Ideal for
- Families of four with a fifth seat spare
- Buyers comparing complete delivered prices
- Year-round use, given the thermowood shell
Not ideal for
- Plots that cannot take a 2.1m square plus access
- Wood-fired purists at this size
- Anyone avoiding electrical work entirely
- Capacity
- 3–5 people on L-shaped benches
- Walls
- 45mm thermowood
- Heater
- 6kW Harvia Vega, included, 32A supply
- Internal size
- 200cm × 196cm × 140cm
- Price
- £5,499.99, reduced from £6,999.99
- Bigger still
- 6–8 person Cube £8,499.99
CenturaHeat 4 Person Steam Sauna
8.6out of 10
Four seats and an 8kW Harvia stove for £4,003 is the cheapest complete four-person cabin in this ranking. The hemlock cabin runs app control as standard, stands 1800mm square at 2000mm tall, and the oversized stove brings it to temperature in 25 to 35 minutes, quicker than most cabins twice the price.
Our verdict
The case is the price, £1,500 under the Cube for the same seated four, and the counter-case is the shell: hemlock panels lose heat faster than 45mm thermowood, which shows up in winter running cost rather than in summer comfort. The 8kW stove needs a 40A supply, so quote the electrical run before banking the saving. As a three-season family cabin it is the sharpest number here.
Ideal for
- Four seats at the lowest complete price
- Households that run the sauna spring to autumn
- Buyers who want fast heat-ups on app control
Not ideal for
- Nightly midwinter users watching the meter
- Consumer units without headroom for 40A
- Thermowood loyalists
- Price
- £4,003 with the stove included
- Heater
- 8kW Harvia, dedicated 40A supply
- Footprint
- 1800mm × 1800mm, 2000mm tall
- Material
- Canadian hemlock
- Heat-up
- 25–35 minutes
- Controls
- App control as standard
Outdoor Living 4 Person Barrel
8.2out of 10
£2,999 for a four-person barrel with the electric heater already included, which makes this the cheapest route to four outdoor seats in the ranking. The barrel is tongue-and-groove spruce staves banded in steel, seating two pairs on facing benches, and it arrives flat-packed for a realistic weekend assembly on a prepared base.
Our verdict
Under £3,000 complete is a number the cabins cannot touch, and for a first family sauna it is the entry ticket that matters. Spruce staves need a maintenance coat where cedar and thermowood do not, facing benches put knees closer than an L-shape does, and resale polish is thinner than the big-brand barrels. None of that argues against it at this money.
Ideal for
- Four seats for under £3,000, heater in
- First saunas that must not strain the budget
- Buyers happy to oil a spruce shell yearly
Not ideal for
- Anyone who wants cedar or thermowood
- Tall bathers, given the curve at the ends
- Buyers who want installation handled
- Price
- £2,999 with electric heater
- Capacity
- 4 people on facing benches
- Material
- Spruce staves, steel hoops
- Assembly
- Flat-packed, self-build weekend
- Maintenance
- Annual treatment for softwood
- Retailer
- Outdoor Living, UK stock
EdenHut Heston
8.5out of 10
The Heston is delivered fully assembled: a 44mm thermowood four-seater craned off the truck onto your prepared base, with L-shaped benches, tempered glass, terrace-board flooring and ventilation already fitted, for £6,865 including delivery. Made to order in 4 to 8 weeks with a 2 year warranty.
Our verdict
Every other cabin here hands you a 600kg flatpack at the kerb; this one arrives as a sauna. That is worth the £1,365 over the Cube to anyone without the crew, the tools or the appetite for a build weekend, and the 44mm thermowood shell gives up nothing on winter performance. Check crane access from road to base before ordering, since a built cabin cannot be walked through a side gate.
Ideal for
- Buyers who want zero assembly
- Gardens with clear access for delivery
- Thermowood performance with a UK maker
Not ideal for
- Narrow side passages and stepped gardens
- Budgets already stretched at £5,500
- Anyone in a hurry, at 4–8 weeks made to order
- Delivered
- Fully assembled, kerbside or craned
- Walls
- Solid 44mm thermowood
- Size
- 210cm × 160cm
- Price
- £6,865 including UK delivery
- Lead time
- Made to order, 4–8 weeks
- Warranty
- 2 years
Auroom Mira 4–5 Person
9.0out of 10
The larger Mira kit seats 4 to 5 behind a full tempered-glass front, with a thermo-aspen interior, indirect LED bench lighting and a thermo-spruce shell from the Thermory group's timber engineering. It is the design object of the four-person tier, sold through dealers and quoted per configuration.
Our verdict
When the sauna faces the house and has to earn its place visually, the Mira is the four-seater to price up. The glass wall and the timber are a class above everything else in this list. It ranks fifth on process, not product: no published price, a heater specified per build, and dealer quotes that land above the Cube for the same seats. Enquire with the full spec and compare delivered numbers.
Ideal for
- Gardens where the sauna is on show
- Buyers who want a glass elevation
- Design-led projects with dealer patience
Not ideal for
- Fixed budgets needing a number today
- Buyers who want one price, heater in
- Shaded plots that waste the glass
- Capacity
- 4–5 people
- Front
- Full tempered glass wall
- Shell
- Thermally modified spruce
- Interior
- Thermo-aspen, LED bench lighting
- Group
- Thermory, thermo-timber producer
- Pricing
- Per configuration through dealers
Side by side
| # | Model | Score | Type | Capacity | Price |
|---|---|---|---|---|---|
| 1 | Polar Recovery Sauna Cube | 9.4 | Outdoor cabin, electric | 3–5 people | £5,499.99 |
| 2 | CenturaHeat 4 Person Steam Sauna | 8.6 | Outdoor cabin, electric | 4 people | £4,003 |
| 3 | Outdoor Living 4 Person Barrel | 8.2 | Barrel, electric | 4 people | £2,999 |
| 4 | EdenHut Heston | 8.5 | Outdoor cabin, electric | 4 people | £6,865 |
| 5 | Auroom Mira 4–5 Person | 9.0 | Outdoor cabin, electric | 4–5 people | On enquiry |
What four seats actually requires
Four adults need about 2.4m of bench between them, which is why real four-seaters start around a 1800mm square footprint and the comfortable ones run past 2m. The L-shaped layouts used by the Cube and the Heston seat four while letting one person stretch out, which is the arrangement families actually use. Anything sold as 4 person on facing benches puts knees closer than the brochure photo admits.
Capacity up from here gets cheap fast:the main outdoor ranking is led by the same 3–5 person cabin that wins this list, and its 6–8 person variant runs £8,499.99, which is the least expensive group capacity in the UK market.
Stove output and the 40A question
A four-person cabin is 6 to 10 cubic metres of air, and the rule of thumb of 1kW per cubic metre puts the rightstove for the volume at 6kW to 8kW. More output heats faster, and the CenturaHeat's 8kW is why it reaches temperature in 25 to 35 minutes, but it also moves the electrical requirement from a 32A to a 40A dedicated supply.
That distinction belongs on the shortlist, not in the surprise column: an older consumer unit without 40A of headroom adds a board upgrade to the install quote, and the electrician's figure can swing £300 to £800 either way on cable run alone.
Timber decides the winter bill
Every cabin here reaches 90°C on a summer evening. January separates them: 45mm thermowood holds its temperature with the stove cycling gently, while hemlock and spruce panels give heat back to the wind and pay for it at the meter. The £1,500 gap between the CenturaHeat and the Cube is largely this, bought once against paid weekly.
Timber also sets the maintenance calendar. Spruce wants a breathable treatment every year or two, often as a warranty condition, while thermowood andcedar builds weather without the ritual. A family cabin is a 10 year purchase, so the coating schedule is worth reading before the colour chart.
Delivery day, planned backwards
A four-person flatpack is roughly 600kg on a pallet, delivered kerbside by tail-lift, and the distance from kerb to base is the buyer's problem. Side gates, steps and soft lawns defeat more delivery days than any manufacturing fault, which is the case for the Heston's arrive-built model and for pricing professional fitting at £1,200 to £2,000 with the cabin rather than after it. A base laid late is the most expensive ofthe decisions made before ordering, because a made-to-order cabin arriving with nowhere to stand becomes a storage problem.
Couples watching this list for a future household can also work the other way: thetwo person cabins free up £1,500 to £2,500 and a metre of garden, and the honest question is simply how many people will ever sit in the heat at once.
Frequently asked questions
How much does a 4 person outdoor sauna cost in the UK?
Complete four-seaters in this ranking run £2,999 to £6,865 with the heater included. Under £3,000 buys a spruce barrel, £4,003 a hemlock cabin with an 8kW stove, and £5,499.99 the thermowood pick that tops the list.
What size stove does a 4 person sauna need?
Work on about 1kW per cubic metre of cabin and round up for glass and winter. Four-person cabins land at 6kW to 8kW, which is why the two leaders here carry exactly those outputs.
What electrical supply does an 8kW stove need?
A dedicated 40A supply, a step beyond the 32A run a 6kW stove uses. Both are notifiable work for a registered electrician, and a long garden cable run in armoured cable is often the biggest single line on the install quote.
Does a 4 person sauna really seat four?
Seated upright, yes, on around 60cm of bench per adult. One person lying down while others sit is the layout an L-shaped bench handles well, which the Cube and the Heston both use. Four lying down is not a thing any cabin this size does.
Do I need planning permission for a family-size garden sauna?
Usually not in England: under permitted development a single-storey garden building can stand within 2m of a boundary at up to 2.5m tall, and every cabin here is built under that line. Check locally for conservation areas, listed buildings and flats.
How heavy is a 4 person cabin and what base does it need?
Around 600kg empty for the thermowood cabins, before people and water. That needs a level, load-bearing base, concrete, paving on a sub-base, or a reinforced deck, laid and cured before delivery day.
How much does a 4 person sauna cost to run?
A 6kW stove session costs about £1.57 at the 26.11p per kWh cap rate, and an 8kW stove about £2.10, assuming a heat-up plus an hour of thermostat cycling. Wall build moves these numbers more than stove brand does.
How long does delivery and assembly take?
Made-to-order cabins run 3 to 8 weeks to the kerb. Self-assembly is a genuine two to three person weekend; professional fitting is £1,200 to £2,000 and usually a one or two day job. The EdenHut route skips assembly entirely by arriving built.
Wood-fired or electric for a family cabin?
Electric dominates this size class because a thermostat and timer suit family scheduling, and every entry here is electric as ranked. Wood fire at four seats mostly lives in the barrel market or the 6–8 person Cube variant at £9,999.99.
Which 4 person sauna is best for winter use?
The 45mm thermowood cabins, the Sauna Cube and the EdenHut Heston, hold their heat through cold nights with the least running cost. Panel-walled cabins work in winter too; they just spend more electricity doing it.