A dark gray wooden 250 sauna cabin with a circular opening, shown outdoors on a gravel surface with trees and shrubs in the background.A wooden barrel-250 sauna cabin with a dark gray shingled roof, set outdoors in a snowy landscape.A barrel-shaped 250 wooden sauna cabin with wooden front door, shown outdoors on a grassy lawn with trees in the background.A round wooden 250 sauna cabin with built-in benches and a central heater, situated outdoors on a grassy lawn with a building and greenery in the background.Barrel Sauna 250 with front balcony, exterior view in a garden settingInside the cabin, benches along both sides with the heater in the cornerA round wooden 250 sauna cabin with large glass windows sits on a wooden platform in a backyard garden setting with trees and a blue sky.A round wooden 250 sauna cabin with built-in benches and an open door, photographed outdoors on a wooden deck with trees and blue sky in the background.Barrel Sauna 250 exterior showing the curved stave construction and doorA wooden 250 sauna cabin with a dark green roof sits on a wooden deck beside a swimming pool, surrounded by trees and shrubs outdoors.The Harvia Vega BC80, the 8kW electric heater fitted as standard, controls built inThe Harvia M3, the compact wood burning stove, 30kg of stoneThe Harvia Legend 150, which holds 120kg of stone against the M3's 30kgCut through of 250-barrel sauna to show sizing and configurationA wooden 250 sauna cabin with an open front and side, showing the interior with wooden walls, bench seating, a bucket, and a towel, isolated on a white background.

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Barrel Sauna 250: 4 Person Outdoor Sauna with Balcony

Three heaters and how much of it is glass. Everything else is in the price.

From From £6,944.00

Delivered and installed42mm solid walls4 year cabin warranty
I ordered the Barrel Sauna 250 in Thermowood, with a wood fired stove… The finished product is of outstanding quality, much better than those offered by bigger firms and even exceeded my high expectations.
Paul A
Heater Harvia Vega BC80, 8kW electric
Exterior finish Not selected
Roof colour Not selected
Tempered glass None

Screen colour is a guide rather than a match, and timber grain moves the result either way.

Delivery and installation included, mainland Britain

Typically 8 to 10 weeks, depending on availability and the season. Email us for a current date, or we confirm yours when you order.

Warranties honoured properly Fair, clear returns
  • Built in position by the maker's own crew, not left on a pallet
  • One to two days on site, whatever the weather
  • Installed from the Scottish Highlands to London
What you're buying
Cabin
205cm across and 250cm long, 42mm solid log side walls, covered front balcony
Inside
Bench seating for four, or two lying down
Heater
Harvia Vega BC80 8kW electric as standard, or the M3 or Legend 150 wood burners
Also included
Lamp shade kit, backrests, headrests, and the bucket, ladle and thermometer
Finish
Six exterior colours and five roof colours, applied before it arrives
Electrics
230V single phase on a 35A circuit, electric heater only
Delivery
Delivered and built in position, one to two days on site

Three heaters, and the decision is not how much heat you want. It is whether you would rather call an electrician once or sweep a flue twice a year, and then how much stone you want holding the heat. That is a question about your habits rather than about the cabin. The 8kW electric heater is included; two wood burning stoves are offered above it.

Delivery & installation

Delivery and installation are both in the price. The cabin is delivered and built in position, typically one to two days, rather than left on a pallet at the kerb. No minimum, nothing added at checkout, and nothing invoiced afterwards.

The Scottish Highlands and Islands, Northern Ireland, the Isle of Man and the Channel Islands are quoted individually, because the cost genuinely differs. Ask before you order and we will give you a firm figure.

You provide a level base rated for the loaded weight, close to a tonne once the heater, stones and four adults are on it, and a clear route from wherever a lorry can stop. The base is not included.

Warranty

Four years on the timber construction and two years on the heater.

What it does not cover is published in the maker's own terms, and we would rather you read it here than find it afterwards. These cabins are not insulated. Solid timber is cut, dried and machined, and it can move slightly with the weather. And because a garden sauna is not heated continuously, the timber can pick up damp marks, mould or discolouring on the surface. The maker's position, in its own words, is that none of that damages the structure, and none of it is treated as a fault under the warranty.

That is the normal behaviour of solid timber standing outside through a British winter rather than a sign that something has gone wrong. Airing the cabin after a session and letting it dry properly is most of the answer.

Claims come to us. One email, and we deal with the maker and with Harvia on your behalf rather than handing you a phone number.

Returns

This cabin is made to order in your choice of heater, roof colour and finish. Until production begins you can cancel and be refunded in full, with no reason needed.

Once production begins, made to order goods are treated differently under the Consumer Contracts Regulations, and our returns policy sets out exactly where that leaves you. Anything that arrives damaged or faulty is ours to put right either way.

About this product

A single chamber barrel sauna, 205cm in diameter and 250cm long, with a covered balcony and bench seating at the front. Four people seated, or two lying down.

Why it is built without insulation

Side walls are 42mm solid logs; the front and back walls are 28mm tongue and groove. There is no insulation behind either, and that is the design rather than an economy. The mass of the timber is the insulation, which is how a traditional barrel works: it takes longer to bring up than an insulated cabin and it sheds heat faster once the fire is out. What you get in return is a cabin that behaves like a sauna rather than like a heated room, and a shape with no corners for heat to sit in.

The door opening measures 169 x 59cm. The door itself is timber as standard, and a tempered glass door is available at no extra cost if you ask when you order. Choose a full glass front and the glass door comes with it, because the door is part of that wall. The cabin weighs 650kg; add the heater, the stones and four adults and the loaded figure is close to a tonne, which is the number to design the base around rather than the cabin weight on its own.

Thermo treated Scandinavian spruce only. This cabin is also built in untreated spruce and we do not offer it. Thermo treatment is kiln modification with heat and steam rather than chemicals; it raises dimensional stability and resistance to rot, which is what a timber cabin standing in a British garden through a wet January is actually up against. It weathers to silver grey under UV, a surface change rather than a structural one.

The heater, and the only decision that matters

Three heaters, all Harvia, all supplied with split face stones. What separates them is not heat output. It is which trade you would rather deal with, and how much stone you want holding the heat.

Harvia Vega BC80, 8kW electric. Fitted as standard. Rated for 7 to 12 cubic metres, 20kg of stones, controls built into the heater. It needs a dedicated circuit installed and certified by an electrician: 8kW at 230V is about 35 amps, nowhere near a 13A plug, and a room containing a sauna heater is a special location under Approved Document P, so the work is notifiable in England. That visit is a separate cost. We would rather tell you here than after you have ordered.

Harvia M3, wood burning. 16.5kW, rated for 6 to 13 cubic metres, 30kg stone capacity. No supply, no electrician, no circuit, and no running cost tied to a unit rate.

Harvia Legend 150, wood burning. 16kW, same room rating, and 120kg of stone against the M3's 30kg. That is the whole argument for the Legend and it is checkable on Harvia's own data sheets: four times the stone mass holds four times the heat, so the steam is softer, it lasts longer between loads, and it recovers faster after a ladle of water. If you intend to use it properly and often, that is where the extra goes.

Is this the right one for you

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.

You will use it through the winter, not just in it

Winter is the point of everything we sell, and it is also the season that decides whether a thing gets used. What settles that is rarely the product. It is how much stands between you and it on a wet Tuesday.

Worth confirmingyou expect a handful of sessions a year. Anything with a running cost attached is poor value at that rate, and there is usually a simpler answer we would point you at instead.

You would rather know the running cost than be surprised by it

We publish what a thing costs to own with the fuel or electricity price stated beside it, and where a maker has not measured something we name the gap instead of estimating it.

Worth confirmingyou want one headline number with no conditions attached. The honest figure in this category always has conditions, and a number without them is a number somebody invented.

The product that gets used is the one worth recommending, and it is not always the expensive one.

Will it work where you are

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 they would not reach the spot, or the ground under them was never going to hold them.

Measure the narrowest point along the whole route from where a lorry can stop, not the gate. The pinch three metres past the gate, where the drainpipe is, catches more deliveries than the gate ever does.

Check your garden in seven questions Free, instant, and it will tell you plainly when this is the wrong answer for your space.
What actually happens

From order to first use.

Every competitor in this category drops a pallet on your driveway and leaves. This one is built in position by the people who made it. Here is each stage, and what owners say about it. Before you order, email hello@tarnfell.com and we will confirm the current lead time for this cabin, delivery access, base requirements or anything else you would rather have settled first.

  1. Week 0

    Order and site check

    Base requirements and access are agreed before anything is made. You arrange the base and, on the electric heater, the supply.

    …he kept me updated with progress and helped answering more questions about the electricity requirements and the base preparations.
    Allie Dunnington
  2. Weeks 1 to 8

    Made to order

    Built to your heater, finish and roof colour, then road freighted to the UK. You are told where it is in the process rather than left to wonder.

    Regular communication kept us informed about progress at the factory and fitting date.
    leighton dee
  3. Build day

    Two people, in your garden

    The crew arrives in the morning and assembles the cabin on your base. Most builds finish the same day; this one usually takes one to two.

    …arrived promptly at 08:00 to begin building and finished at around 16:00.
    Paul A
  4. Same day

    Whatever the weather

    Builds go ahead in rain. Sites are left clean and tidy.

    …one full day and it was up and running… sorry about the Scottish weather as it was heavy rain that day.
    Gary Adams
  5. After

    Your electrician connects it

    The 8kW electric heater needs a dedicated 35A circuit installed and certified by a qualified electrician. That is not included. Either wood burner needs no supply at all.

    Ordered a barrel sauna paid the deposit, organised my sparky to ensure power was available…
    John Milton
Living with it

What owning one actually involves.

The handful of things that decide whether this is still in use in year three.

The baseYours to provide

The cabin is 650kg empty. Add the heater, its stones and four adults and you are designing for close to a tonne, level and drained. The base is not included.

Power or fuelDecided by your heater

The electric option means a dedicated 35A circuit, installed and certified before first use. Either wood burner means a flue, a carbon monoxide alarm and Ready to Burn logs, and no electrical supply at all.

Airing itTwo minutes after a session

The cabin is not insulated and is not heated between uses, so leave it open to dry rather than shutting the damp in. The maker's terms say surface marks and discolouring are not faults, and drying it out is most of the answer.

The waitFour to eight weeks, then one to two days on site

Made to order, not taken from stock. Larger or more customised builds can run to twelve weeks. Then assembled in your garden rather than left on a pallet at the kerb.

Delivered all the way to Loch Long in Scotland. Good communication throughout…
Jack Mcginley
A dark gray wooden 250 sauna cabin with a circular opening, shown outdoors on a gravel surface with trees and shrubs in the background.
A wooden barrel-250 sauna cabin with a dark gray shingled roof, set outdoors in a snowy landscape.
A barrel-shaped 250 wooden sauna cabin with wooden front door, shown outdoors on a grassy lawn with trees in the background.
A round wooden 250 sauna cabin with built-in benches and a central heater, situated outdoors on a grassy lawn with a building and greenery in the background.
Barrel Sauna 250 with front balcony, exterior view in a garden setting
Inside the cabin, benches along both sides with the heater in the corner
A round wooden 250 sauna cabin with large glass windows sits on a wooden platform in a backyard garden setting with trees and a blue sky.
What it costs to live with

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.

An evening session, 8kW electric

about £3.13

Heat up: 8 kW × 0.75 h is 6 kWh. Holding: 1.5 h at roughly half duty is another 6 kWh. That is 12 kWh at 26.11p, working shown in full so you can check it.

Three evenings a week, for a year

about £489

12 kWh × 3 × 52 is 1,872 kWh. Twice a week is nearer £326. Both figures move with your tariff, which is why the unit rate is stated above rather than buried.

Either wood burner

your log price decides

An honest figure needs a fuel price, and log prices vary too much by region for one number to be true everywhere. Whatever you pay, the logs must carry the Ready to Burn mark in England. The Legend 150 holds 120kg of stone against the M3's 30kg, so it takes longer to bring up and holds heat longer once there.

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 8kW electric heater; thermostat cycling near half power once hot. That last one is the soft figure. The cabin is not insulated, so on a cold night the heater will hold at more than half duty and the real cost sits above these numbers rather than below them. We would rather publish the floor and say so than publish an average nobody measured. Rerun the sums at your own tariff.

Owning it properly

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 Electric heater only. Harvia specify a 35A fuse and 6mm² cable at 230V single phase, which is well past a 13A plug, and a room containing a sauna heater is a special location under Part P. Once, before first use A qualified electrician
Fit a carbon monoxide alarm Either wood burner. To BS EN 50291, in the same room as the stove, positioned as Approved Document J sets out. Once, at installation You or your installer
Air it out after use The cabin is not insulated and is not heated between sessions. The maker's terms say damp marks and discolouring can appear and are not faults, so leave it open to dry rather than shutting the moisture in. Every session You
Sweep the flue Either wood burner. Timed so one sweep falls before the heating season and one after its peak. At least twice a year A chimney sweep
Buy the right fuel Wood sold in England in volumes under two cubic metres must be certified to 20 per cent moisture or less. Every purchase You. Look for the Ready to Burn mark
The sauna has settled, the door in particular has changed shape and some sap has leaked from the wood, all to be expected from a new build!
Roy Dyson

Where this comes from.

Regulation and guidance, linked so you can read it yourself. None of it is our opinion.

Specification

Every figure the makers publish.

Warranty
4 year cabin warranty

Cabin figures from the cabin maker's published specification and terms, heater figures from Harvia's. Nothing here has been rounded, adjusted or filled in from a comparable model.

The sauna retains the heat… I've had the temp between 75 and 95 deg C… it holds it's temperature at 75 for over an hour without a problem.
Roy Dyson
In the price

What arrives, and what does not.

  • The cabin, 205cm across and 250cm long, in thermo treated Scandinavian spruce
  • Your heater, fitted, with its split face stones
  • A chimney kit, on either wood burning option
  • Your exterior finish, one of six, applied before it arrives
  • Your bitumen roof, one of five colours
  • Delivery to mainland Britain, with nothing added at checkout or afterwards
  • Installation on site, typically one to two days
  • Four years of warranty on the construction and two on the heater
  • The base. Level, drained and rated for close to a tonne loaded
  • Electrical work. The 35A circuit is a qualified electrician's job and a separate cost
  • Insulation. There is none behind the timber, which is how a traditional barrel is built
  • On either wood burner: the flue sweep, the carbon monoxide alarm and the logs
Before you commit

Reasons to buy something else.

Nothing wide enough reaches the spot

The crew build it in position, so it has to get there. Measure the narrowest point along the whole route from where a lorry can stop, not the gate, and tell us the figure before you order rather than on the day.

Your supply has no headroom for another 35 amps

8kW at 230V is about 35 amps on a circuit of its own. On an older supply that is a conversation with an electrician before it is a purchase, and occasionally one with your network operator. It is a free phone call and worth making first. If the answer is no, either wood burning option needs no supply at all.

You want it to look in five years exactly as it does on day one

It will not, and no warranty anywhere covers that. Thermo treated spruce weathers to silver grey under UV, and the maker's own terms say an uninsulated cabin that is not heated continuously can pick up damp marks, mould or discolouring on the surface. Its position is that none of it touches the structure, which is why the construction carries four years. If a cabin that visibly ages would bother you, buy something clad in something else.

You need it this month

It is made to order and takes four to eight weeks, and up to twelve on larger or more customised builds, then a day or two on site. Demand is seasonal, so the same cabin ordered in October takes longer than one ordered in March. That is the honest figure rather than the hopeful one, and a cabin arriving in October when you wanted August is a worse purchase than one you waited for deliberately. Email us before you order and we will confirm the current figure.

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.

The Tarnfell Standard

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.

Verified by Tarnfell against a published source Confirmed by the manufacturer in writing Not independently measured Information not yet published
Heater performance
Verified

Outputs, room ratings, stone capacities and connection requirements for all three Harvia heaters, checked against the manufacturer's published data sheets. The specific documents are linked in the sources list further up this page.

Dimensions and construction
Confirmed by manufacturer

Wall thicknesses, dimensions, weights and the thermo treatment, as supplied in writing by the workshop that builds this cabin.

Installation
Verified

Two person crew, built in position, one to two days on site: described independently, across five years of installations, in the owner reviews quoted on this page.

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 heater ratings rather than measured in use, and they say so where they appear.

Warranty terms
Confirmed by manufacturer

Four years on the construction, two on the heater, and the surface weathering exclusions, as set out by the maker in writing and repeated in plain language on this page.

First hand states will be added when we install a unit of our own. Until then, nothing on this page is presented as tested by us.

Manufacturer and installation reviews

What owners say about the build

From owners of saunas built and installed by the same manufacturer and the same crew who will build yours.

Build quality
Good quality materials were used for building our sauna, quick delivery. Takes only two days to build and ready to use.
Sergejs Nadolskis
Capacity and heat
Fits perfectly 4 people, heats quickly and retains heat well, as a proper Finnish sauna.
Marjaana Peeters
Installation
…had it built and painted in about eight hours in total. It was a really awkward space but they worked swiftly, efficiently and without complaint.
Mark Readman
After the sale
…we had a small item missing this was actioned immediately and was sent by recorded delivery to the highlands of Scotland within a couple days…
Ian Frost
Buying decision
Educated and guided me throughout the whole process of identifying the right sauna for me…
Mark Jackson

Every review describing this cabin or its installation is eligible, positive or otherwise. Reviews naming a different model appear on that model’s page instead. Extracts are quoted as written and nothing has been reworded.

Before you decide

Weighing this against something else? Let us do the homework.

Choosing between two of these 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, what it does, running costs, and what each asks of your space and your electrics. 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.

Free, no obligation, and your details go nowhere else.