Indoor Sauna UK: Types, Space, Power and Costs Explained

An indoor sauna is a heated cabin, tent or blanket that you use inside the house, and for most UK homes the realistic choice is between a plug-in far-infrared cabin and a hard-wired traditional Finnish cabin. Infrared models run at roughly 45°C to 60°C, plug into a 13A socket and cost around 50p an hour to run. Traditional cabins get to 80°C and beyond with proper steam, but their 4.5kW to 9kW heaters need their own circuit, an electrician and some thought about ventilation. Tents and blankets sit underneath both as the cheap way in.

If you're planning a building at the bottom of the garden instead, our garden sauna guide covers bases, planning rules and outdoor heaters. This page is about the sauna that lives in your spare room, garage or loft.

The four types of indoor sauna

Far-infrared cabins

These are the most common indoor saunas sold in the UK. A timber box, usually hemlock or spruce, holds ceramic or carbon panels that warm your body directly rather than heating all the air first. The air stays cooler, around 45°C to 60°C, and most one and two person cabins plug into a normal socket. Warm-up takes minutes rather than the best part of an hour.

The catch is the feel. You won't get a blast of steam, you can't ladle water on anything, and people raised on hotel saunas sometimes find it underwhelming. Our infrared sauna vs traditional sauna comparison goes through the differences in detail, and sauna temperature explains what each range actually feels like.

Traditional electric Finnish cabins

A traditional cabin is an insulated timber room with an electric stove topped with stones. It heats the air to 80°C to 100°C, and throwing water on the stones gives you the hit of humid heat Finns call löyly. Nothing else on this list matches it.

You pay for that in wiring. Even a compact 4.5kW heater draws close to 20 amps, far beyond what a 13A plug can supply, and larger 6kW to 9kW stoves need heavy cable and a large fuse at the consumer unit. Preheating takes 30 to 45 minutes too, so it's a planned session rather than a spur-of-the-moment one.

Steam and portable infrared tents

Pop-up tents are fabric shells on a folding frame, heated either by a small steam generator (often about 1kW) or by infrared panels. You sit on a chair inside with your head poking out of the top. They plug in, fold away into a cupboard and cost a couple of hundred pounds. They're a perfectly sensible way to find out whether you'll use a sauna twice a week before spending four figures. Our portable sauna guide and how to use a portable steam sauna cover them properly.

Sauna blankets

An infrared sauna blanket is a heated sleeping bag that you zip yourself into while lying down. It draws a few hundred watts and stores flat. Of the four, it's the furthest from a real sauna, as you can't move or sit up, but it takes up no floor space at all. See our best sauna blanket UK roundup if that's the route you want.

How much space you need

Floor area is only half the question. Height matters as much, because cabins stand around 1.9m to 2m tall and you need clearance above for ventilation and, with a traditional stove, the gap the heater manual specifies.

Size	Typical footprint	What it suits
1 person	About 90cm x 90cm	Corner of a spare room or bedroom
2 person	Roughly 120cm wide, 100cm to 110cm deep	Spare room, garage, large landing
3 person	Roughly 150cm wide	Dedicated room or garage bay
4 person	Roughly 180cm wide or an L-shaped corner unit	Basement, large garage, converted outbuilding

These are typical sizes, not standards, so measure your room and check the exact dimensions on the spec sheet. The SaunaMed one person cabin, for example, lists a footprint of about 90cm x 90cm x 190cm. Add space to open the door fully and room to get behind the cabin for assembly, since many kits slot together panel by panel and you can't build them flat against a wall.

One trap catches people out: carrying the panels upstairs. Measure the stairwell turn and every doorway on the route, not just the room it's going into.

Power: 13A plug or hard-wired?

This is the single biggest decision, and it splits indoor saunas into two camps.

Plug-in models (most infrared, all tents and blankets)

A UK 13A socket supplies about 3kW at most. Small infrared cabins, steam tents and blankets are designed to stay well under that. Plug them straight into a wall socket, never into an extension lead or a multi-way adaptor, because a heater pulling a steady current for an hour is exactly the load that cooks a cheap lead. If you're buying a larger three or four person infrared cabin, check its rated wattage before you buy. Some of the bigger ones need their own circuit even though they're infrared.

Hard-wired traditional heaters (4.5kW to 9kW)

Traditional sauna stoves are wired directly into a dedicated circuit from the consumer unit, with the cable size and fuse rating set by the heater manufacturer. A 9kW stove is a serious load, roughly in electric shower territory, and some older consumer units or main fuses won't take it alongside everything else in the house.

In England, putting in a new circuit is notifiable work under Approved Document P, the building regulation covering electrical safety in dwellings. The practical answer is to use an electrician registered with a competent person scheme, who can self-certify the job and register it with building control for you. The same applies if you're tempted to put a sauna in or next to a bathroom, because work near a bath or shower falls under the rules too. Wales, Scotland and Northern Ireland have their own regimes, so check locally there.

Get the electrician round before you order the sauna. If your supply can't take a 9kW stove, you'd rather know that before the cabin arrives, and a smaller room with a 4.5kW or 6kW heater is often the sensible compromise. Our home sauna cost guide has more on what the electrician is actually doing.

Ventilation and humidity

A traditional sauna needs fresh air moving through it, both for comfort and so the heater works as designed. Manufacturers typically specify an inlet low down near the stove and an exhaust vent higher up or on the opposite side, and the exact positions are in the heater manual. Follow it, because a stove that can't breathe heats unevenly and leaves the air feeling stale.

Moisture is the other half. Every ladle of water on the stones turns to steam, and once you open the door that humid air spills into the house. In a spare room with a window, that's easy: open it and leave the cabin door ajar for half an hour afterwards so the timber dries. In a windowless box room or basement, plan for an extractor fan, or you'll be fighting condensation on cold walls and mould behind the cabin.

Infrared cabins are much easier to live with. The heat is dry, there's no water involved, and most have a small vent in the roof. Normal room airflow is enough. Steam tents are the exception among plug-in options: they put a surprising amount of water into the air, so treat them like a long shower and ventilate the room.

Flooring

What the sauna sits on matters more than people expect, because sweat drips, water splashes and timber benches leak a little resin over the years.

• Infrared cabins are dry, so they can sit on most hard floors and even on carpet, though a hard, level surface makes assembly far easier and keeps the panels square. A rubber or vinyl mat underneath protects wooden floors.
• Traditional cabins belong on a water-resistant floor such as tiles, sheet vinyl or sealed concrete. Carpet is a bad idea: it holds moisture, smells after a few months and can trap heat under the cabin. Some kits come with a floor, others are designed to sit on yours, so check which you're buying.
• Steam tents need a towel or mat underneath at minimum, as condensation runs down the fabric and pools at the base.

Duckboards or a removable slatted floor inside a traditional cabin keep your feet off a hot, wet surface and can be lifted out to dry.

Where to put an indoor sauna

Spare room or bedroom

The easiest spot for an infrared cabin. You'll have a socket, a window for airflow and usually a carpet or laminate floor that a mat can protect. For a traditional cabin, a spare room works if the electrician can reach it without ripping up half the house.

Garage

Garages are popular because they often have a concrete floor, space to spare and a short cable run to the consumer unit. The downside is cold. An uninsulated garage in January drags heat out of the cabin, so warm-up takes longer and running costs climb. Check the walls and door for damp, too, because timber cabins don't like it.

Loft or attic

Think carefully here. A sauna full of people, plus benches, a stove and a box of stones, concentrates a lot of weight in a small area, and many loft floors were never built to carry that kind of load. Unless the loft has already been properly converted with a habitable floor, ask a structural engineer to look at the joists before you carry anything up. Headroom under a sloping roof also rules out a lot of cabins.

Basement

A dry basement suits a traditional cabin well: solid floor, little noise transfer and space for a shower nearby. Ventilation is the issue, so budget for mechanical extraction if there's no window.

What an indoor sauna costs

These ranges come from our home sauna cost guide, which we keep up to date with Amazon UK and specialist retailer prices.

Type	Rough price	Electrician?
Sauna blanket	About £100 to £400	No
Steam or infrared tent	About £100 to £300	No
1 to 2 person infrared cabin	About £1,300 to £2,200	Usually not
3 to 4 person infrared cabin	Up to about £4,000	Sometimes
2 person traditional cabin	From about £1,800	Yes
3 to 4 person traditional cabin	About £3,000 to £6,000	Yes

On top of a traditional cabin, budget for the electrician, any ventilation work and possibly new flooring. We won't give you a single number for the wiring, because a cabin beside the consumer unit and one in a loft at the far end of the house are completely different jobs. Get two quotes.

Running costs, with the working shown

We've assumed 26.32p per kWh, the Ofgem price cap GB average for Direct Debit customers from 1 October to 31 December 2026. Your own rate will differ by region and tariff, so swap in the figure from your latest bill. The sum is heater power in kW, multiplied by hours on, multiplied by the unit rate.

Setup	Time on	Energy used	Cost
500W sauna blanket	45 minutes	0.375kWh	about 10p
1kW steam tent	1 hour	1kWh	about 26p
2kW infrared cabin	1 hour, including warm-up	2kWh	about 53p
4.5kW traditional heater	1.5 hours (warm-up plus session)	6.75kWh	about £1.78
6kW traditional heater	1.5 hours	9kWh	about £2.37
9kW traditional heater	1.5 hours	13.5kWh	about £3.55

Every figure there is a ceiling. Once a cabin hits temperature, the thermostat switches the elements on and off, so the heater spends part of the session drawing nothing. A cold garage pushes the real number back up towards the ceiling. Used twice a week, an infrared cabin costs roughly £55 a year at the upper bound (104 sessions x 53p), while a 6kW traditional heater comes to about £246.

EMF claims: what to make of them

Infrared cabin listings lean hard on "low EMF" and "EMR neutral" labels. Here's the honest picture. Any electric heater, cable or appliance produces low-frequency electric and magnetic fields, and a sauna's heater panels sit close to your body for a long time, which is why some makers try to reduce them. The World Health Organization's EMF guidance says current evidence doesn't confirm any health consequences from low-level exposure, though it notes gaps in the research.

There's no UK standard that defines "low EMF" for a sauna, so the phrase means whatever the seller wants it to. If it matters to you, ask the manufacturer for measured readings at the seat, at a stated distance, and compare like with like. If they can't supply numbers, treat the label as marketing. We wouldn't pay hundreds of pounds extra for it, and we wouldn't rule out a well-made cabin because it doesn't carry the badge.

Safety

Regular sauna use looks safe for most healthy adults, but the research is thinner than enthusiasts suggest. A systematic review of 40 dry sauna studies found mostly beneficial effects, yet only 13 were randomised trials and most had fewer than 40 participants. The one adverse outcome it found was a temporary drop in sperm production in a small study of men, which reversed once they stopped. The authors called for better data on side effects, which is a fair summary of where things stand.

The practical rules for a home sauna:

• Keep sessions sensible. Start with 10 to 15 minutes and build up. Our guide on how long to stay in a sauna covers this in more depth.
• Drink water and skip the alcohol. Dehydration and alcohol both make overheating more likely.
• Know the warning signs. Dizziness, headache, nausea, cramps and heavy, clammy sweating are signs of heat exhaustion. Get out, cool down and drink something. If you don't feel better within 30 minutes, treat it as an emergency.
• Check with your GP first if you're pregnant, have a heart condition or low blood pressure, or take medication that affects heat tolerance.
• Supervise children and never leave them alone in a hot cabin.
• Keep towels and clothing off the heater, and fit a stove guard on a traditional heater so nobody leans on the stones.
• Use the cabin's own timer, which cuts the heater off if someone forgets it's on.

Which indoor sauna should you buy?

If you want something that plugs in, warms up quickly and costs pennies to run, start with a one or two person far-infrared cabin. If you've tried saunas at the gym and it's the heavy, steamy heat you love, nothing but a traditional cabin will do, and the electrician's quote should come before anything else. If you're not sure you'll stick with it, a tent or blanket for under £300 answers that question cheaply.

For a compact plug-in cabin, the SaunaMed 1 Person Hemlock FAR Infrared Cabin is the one we'd look at first. It fits a roughly 90cm square footprint, uses four ceramic heaters and runs from a standard UK plug, and it was £1,649 on Amazon UK when we checked in November 2026. Our SaunaMed 1 person infrared sauna review covers its strengths and the compromises in detail.

Check the SaunaMed 1 Person infrared cabin price on Amazon

If you'd like to compare it against tents, blankets and larger cabins, our best home sauna UK guide ranks the lot, and the sauna pod guide covers the rounded, stand-up style cabins that work indoors and out. For the wider picture on heat and cold for recovery, browse our recovery hub.

Recommended reads

• SaunaMed 1 person infrared sauna review
• Best home sauna UK
• Infrared sauna vs traditional sauna
• Portable sauna guide
• Garden sauna guide