AIRA Outdoor Sauna: 4 to 6 Person Garden Sauna
One decision, the finish. The question this cabin really asks is where it stands.
From £23,860.50
Delivery from £250
Exact cost confirmed for your postcode before dispatch.
Typically 8 to 10 weeks, depending on availability and the season. Email us for a current date, or we confirm yours when you order.
- Huum Drop 9kW heater, WiFi controller and stones in the price
- 55mm cross laminated timber walls and a 60mm CLT floor
- Delivery confirmed for your postcode before anything is dispatched
- Cabin
- 55mm cross laminated timber, 2,010 by 2,740mm and 2,968mm to the ridge
- Inside
- Two tiers of opposing benches in thermo aspen and alder
- Heater
- Huum Drop 9kW electric with WiFi control, 55kg of stones
- Finish
- Thermo pine, natural or black
- Lighting
- Warm white LED strip behind the backrest
- Electrics
- 40A single phase, or 400V three phase
- Delivery
- One crate, set down by a lorry with its own forklift
At 2,968mm to the ridge it needs to be two metres or more from any boundary to stay within permitted development, and that is a tape measure question before it is anything else. The 9kW heater, its WiFi controller, the stones and the lighting are in the price.
Delivery & installation
Delivery is available across the UK. Most mainland postcodes are included in the price; offshore and some remote postcodes carry an additional charge, and we confirm the figure for your address in writing before anything is dispatched.
The cabin arrives flat packed in one crate, 2.35m by 1.1m by 1.4m at 1,270kg plus the heater and stones, delivered by a lorry with its own rear mounted forklift that sets the crate down on a firm, level spot outside your property. The courier phones ahead to agree the day. From the kerb the panels move through the garden by hand, which is how a building of this weight reaches a spot no vehicle can. Once it has left the warehouse it is usually with you within three to eight working days.
Installation can be arranged where you would rather not build it yourself. Once you place your order we confirm the delivery and installation options for your location, and nothing is dispatched until you are happy with both.
Warranty
Two years on the cabin from the date of delivery, under the manufacturer's published warranty. The heater, its controller and the lighting each carry their own maker's warranty, typically two to four years, and those terms are passed on to you in full with your order.
Thermally modified pine weathers to a soft grey under UV. That is the finish maturing rather than a fault, and no warranty anywhere covers the colour of timber standing outside.
Claims come to us. One email, and we deal with the manufacturer and the heater maker on your behalf rather than handing you a phone number.
Returns
This cabin is made to order in your choice of finish. Until the order is placed with the maker you can cancel and be refunded in full, with no reason needed.
After that, made to order goods are treated differently under the Consumer Contracts Regulations, and our returns policy sets out exactly where that leaves you. Check the crate on the day it arrives and tell us about any damage within 48 hours; anything that arrives damaged or faulty is ours to put right either way.
About this product
The AIRA is the cabin in the range that looks like nothing else in it. The roof pitches up to 2,968mm, the benches face each other across the room rather than lining the back wall, and the windows are set in black aluminium frames. It seats four to six people in a 7.94 cubic metre room on a 2,010 by 2,740mm footprint. The height is the thing to understand first: within two metres of a boundary, permitted development in England caps an outbuilding at 2.5 metres, so this cabin needs to stand two metres or more from the fence to avoid a planning application.
The walls are 55mm cross laminated timber, layers of wood bonded crosswise so the panel stays stable and holds heat the way a solid log wall does, and the floor is 60mm of the same, designed to balance moisture and resist mould. Outside is thermally modified pine, inside is knot free thermo aspen and alder. The windows are set in darkened black aluminium frames, and the roof is an EPDM rubber membrane with black trim, pitched rather than flat.
The 9kW Huum Drop heater is in the price, with its glass fronted UKU WiFi controller and 55kg of stones. It sits between the two benches, starts from your phone, and needs a dedicated 40 amp single phase circuit in 10mm² cable, or 3 × 16A on three phase, installed by an electrician. There is a warm white LED strip behind each backrest, fitted at the factory.
One choice to make: natural thermo pine, or the same cabin stained black. The black finish is a special order with a longer lead time, which we confirm before you commit. Everything else is already decided and already in the price.
Who this is actually for.
Every product here is described with the honest opposite beside it: who it suits, and who should be looking at something else. If none of the descriptions below fits you, the right answer is elsewhere in the range, or elsewhere entirely, and we would rather say so.
A pitched roof to 2,968mm, black framed windows and benches facing each other across the room. It reads as a small building rather than a box, and that is the whole reason to pay more for it than the EDEN, which has a larger room.
Worth confirmingyou want the most room for the money. The EDEN in this range has a 9.5 cubic metre room, a terrace, and a lower roofline for less. The AIRA is chosen for how it looks and sits, not for capacity.
At 2,968mm tall this cabin is over the 2.5 metre cap that applies within two metres of a boundary. Stand it two metres or more from the fence and permitted development usually allows up to three metres for a building of this shape, which it clears by 32mm before the base goes under it.
Worth confirmingyour only position is against a fence. That is a planning application rather than a tape measure question, and it is the reason we would point you at a lower cabin instead.
Opposing tiers put the people in the room across from each other, which is how a conversation works and how a sauna in Finland is often laid out. The 9kW heater sits between them.
Worth confirmingyou want the highest capacity on the widest bench. Six is the top of the range here, and four is the number that sits comfortably.
The product that gets used is the one worth recommending, and it is not always the largest one.
The measurements that decide it.
Read this before anything else. Things this size are almost never sent back because they were the wrong product. They are sent back because the crate could not be set down, the panels would not reach the spot, or the ground under them was never going to hold them.
The height is the one to respect. At 2,968mm to the roof this cabin is over the 2.5 metre boundary cap by 468mm, and that cap includes whatever the cabin stands on. Two metres or more from the boundary the cap lifts to three metres and it fits with 32mm to spare.
From order to first use.
Here is each stage, and who does what. Before you order, email hello@tarnfell.com and we will confirm the current lead time for this cabin, delivery to your postcode, installation options, base requirements or anything else you would rather have settled first.
- Week 0
Order and site check
Base, access and your electrical supply are agreed before the order is placed with the maker. You arrange the base and the circuit.
- Then
Made to order
Built to your finish and shipped to the UK. The lead time is confirmed in writing before you commit, and you are told where it is in the process rather than left to wonder.
- Delivery day
One crate, set down outside
A lorry with its own forklift places the crate, 2.35 × 1.1 × 1.4m, 1,270kg plus heater and stones, on a firm spot outside your property. The courier phones ahead to agree the day. You will want two people to move the panels through to the base.
- Build
Panel by panel, on your base
The cabin goes together from the flat pack on the base you have laid. If you would rather hand it over, installation is arranged for your location once you have ordered.
- After
Your electrician connects it
The Huum Drop 9kW heater needs a dedicated 40 amp single phase circuit, or 3 × 16A on three phase, installed and certified by a qualified electrician. That is not included.
What owning one actually involves.
The handful of things that decide whether this is still in use in year three.
About 1,200kg built, before the heater, its 55kg of stones and six adults, so you are designing for close to two tonnes. Concrete, concrete blocks or ground screws, level and drained, laid before the crate arrives. The base is not included.
9kW at 230V single phase is about 40 amps on a circuit of its own, in 10mm² armoured cable, installed and certified by an electrician before first use. On a three phase supply it is 3 × 16A in 2.5mm² instead.
One crate arrives at the kerb and the cabin goes up panel by panel on your base. If you would rather hand it over, installation can be arranged for your location once you have ordered.
Made to order rather than taken from stock, so the current lead time is confirmed with you before you commit, and again when the order is placed. Once it leaves the warehouse it is usually with you within three to eight working days.
The running costs, with the working shown.
The purchase price is public; the running cost rarely is. Ours are published with the assumptions stated, so you can check the sums rather than take our word for them.
about £3.52
Heat up: 9kW × 0.75 h is 6.75 kWh. Holding: 1.5 h at roughly half duty is another 6.75 kWh. That is 13.5 kWh at 26.11p, working shown in full so you can check it.
about £367
13.5 kWh × 2 × 52 is 1,404 kWh. Three evenings a week is nearer £550. Both figures move with your tariff, which is why the unit rate is stated rather than buried.
no cost, some patience
The controller in the price connects to your WiFi, so the heater starts from wherever you are and the cabin is at temperature by the time you walk out to it. The heater only draws full power while it climbs; once hot, the thermostat cycles.
Assumptions: electricity at the Ofgem price cap unit rate of 26.11p per kWh, 1 July to 30 September 2026, including VAT; 45 minutes to temperature at full draw on the 9kW heater; thermostat cycling near half power once hot. The walls are 55mm cross laminated timber, which holds heat far better than an uninsulated cabin, but the maker says plainly that weather affects heat up time, so on a cold night the real figure sits above these numbers rather than below them. Rerun the sums at your own tariff.
What you have to do, and what the rules require.
Everything you have to do, and how often.
| Job | How often | Who |
|---|---|---|
| Install and certify the heater circuit 230V single phase, 40A, 10mm² SWA cable, or 400V three phase, 3 × 16A, 5 × 2.5mm² cable. Outdoor circuits and rooms containing a sauna heater are notifiable work in England. | Once, before first use | A qualified electrician |
| Check the boundary distance This cabin is 2,968mm tall. Within two metres of a boundary the permitted development cap is 2.5 metres, so it needs to stand two metres or more from the fence. | Once, before you order | You, with a tape measure |
| Wash the exterior timber Water and a soft brush. No pressure washer and no coating; the grey patina is the finish, not a fault. | Once a year | You, half an hour |
| Air it after a session Leave the door open until the room has dried. The 60mm CLT floor is designed to balance moisture and resist mould, and a dry cabin is the whole of the maintenance. | Every session | You |
| Check the base is level and draining Ground moves. A cabin that has settled binds at the door before it shows anywhere else. | Once a year | You |
Where this comes from.
Regulation and guidance, linked so you can read it yourself. None of it is our opinion.
- Outdoor circuits and rooms containing a sauna heater are notifiable electrical workApproved Document P, 2013 edition
- Outbuildings within 2 metres of a boundary are limited to 2.5 metres in height under permitted developmentPlanning Portal, outbuildings
- Electricity price used in the running costsOfgem price cap unit rates
- Huum Drop 9kW fuse rating, cable size and 55kg stone quantityThe heater maker's published technical data
- Cabin dimensions, construction, weights, crate size, delivery method and the two year warrantyThe manufacturer's published specification and warranty document
Every figure the makers publish.
- Warranty
- 2 year cabin warranty
Cabin figures from the manufacturer's published specification, heater figures from the heater maker's. Nothing here has been rounded, adjusted or filled in from a comparable model.
What arrives, and what does not.
- The cabin, flat packed: 55mm CLT walls, 60mm CLT floor, EPDM roof, glass and door
- The Huum Drop 9kW electric heater, with 55kg of stones (four packs)
- The UKU WiFi controller, glass black, so the heater starts from your phone
- Warm white LED lighting behind the backrest, fitted at the factory
- Your exterior finish, natural thermo pine or black, applied before it arrives
- Delivery to most mainland UK postcodes, confirmed for your address before dispatch
- Two years of warranty on the cabin, and the makers' own warranties on heater, controller and lighting
- The base. Concrete, blocks or ground screws, level, drained and rated for the loaded weight
- The electrical work. The 40 amp circuit is a qualified electrician's job and a separate cost
- Assembly, unless you take the installation option we arrange for your location
- Delivery to offshore and some remote postcodes, which is quoted before you commit
Reasons to buy something else.
Delivery is by a lorry with its own forklift, which needs somewhere firm and level to place a crate 2.35 × 1.1 × 1.4m, 1,270kg plus heater and stones. A shared private road, steps to the kerb or a double parked frontage all need solving before you order, not on the day.
At 2,968mm to the ridge this cabin is 468mm over the 2.5 metre cap that permitted development applies within two metres of a boundary, base not included. Two metres or more from the boundary the limit rises and it fits. Closer than that is a planning application, and we would rather say so than let you find out from a neighbour.
It will not, and no warranty anywhere covers that. Thermo pine weathers to silver grey under UV. It is a surface change, not a structural one, and the cross laminated timber underneath is unaffected. If a cabin that visibly ages would bother you, buy something clad in something else.
It is made to order, and the current lead time is confirmed with you in writing before you commit. If your deadline is fixed, tell us first and we will say honestly whether it can be met, rather than take the order and hope.
If any of these apply, say so and we will point you at what does suit you, including when that is a cheaper product or a different retailer.
What we know, and how we know it.
Not a rating. A record of where every figure on this page comes from: what we have checked against a published source, what the maker has confirmed in writing, and what nobody has measured yet. The states describe our evidence, not the product.
- Dimensions, construction and weight
-
Verified
External dimensions, room volume, bench sizes, wall and floor construction, timber species, built weight and crate size, checked against the manufacturer's published specification for this cabin.
- Heater and electrical supply
-
Verified
Output, fuse rating, cable size and stone capacity for the Huum Drop 9kW, checked against the heater maker's published technical data. The document is linked in the sources list further up this page.
- Warranty terms
-
Verified
Two years on the cabin from delivery, with heater, controller and lighting warranties passed on from their makers, as set out in the manufacturer's published warranty document.
- Installation
-
Not independently measured
The cabin is flat packed and the maker describes assembly as straightforward. No independent account of build time or crew size exists yet, so we quote neither, and installation is arranged and priced for your location after you order.
- Heat retention and running cost
-
Not independently measured
No independent measurement of this cabin's heat up time or heat loss exists. The running cost figures further up are calculated from the heater rating rather than measured in use, and they say so where they appear.
These states move as the evidence does. When a figure is measured on an installed cabin, by us or by an owner who shares the numbers, its state on this page changes to match, and the figure is corrected if it needs to be.
Weighing this against another sauna? Let us do the homework.
Choosing between two saunas takes evenings of research, so let us carry it. Name the other one you are considering and we will put the two side by side properly: sizes, heat, running costs, and what each asks of your garden and your fusebox. A written comparison or a call, whichever suits you, within 24 hours. And if the other one genuinely fits your space better, we will say so.