Ad Best indoor saunas for UK homes 2026: 6 traditional cabins compared
Traditional heater-and-stones saunas for inside the house, compared on size, heater, electrical supply and price, from £1,750 for two people. Prices checked 10 November 2026.
Quick answer
Traditional indoor saunas for two to four people cost £1,750–£5,199 at the UK retailers we checked in November 2026. Every one of them needs a hard-wired, dedicated electrical supply fitted by a qualified electrician, from 16A for the smallest to 32A for 6kW heaters. In England a room containing a sauna heater is a 'special location' under Part P, so that work is notifiable. If you want to avoid new wiring, a plug-in infrared cabin is the alternative.
An indoor traditional sauna gives you the hot, steamy experience of a spa sauna (pour water on the stones, 65–90°C or more) without a garden building. The catch is the wiring: unlike most infrared cabins, these all need a hard-wired heater circuit. We compared six cabins from Pro-Line Direct and Steam & Oak. We haven’t tested them; specs are as published.
Before you choose: the electrics
Every sauna below must be hard-wired by a qualified electrician. Under Part P of the Building Regulations (England), installing a new circuit is notifiable, and so is any addition or alteration to circuits in a room containing a sauna heater. Get an electrician to look at your consumer unit before you order. If that’s a problem, see our infrared sauna guide.
| Model | From | People | Heat | Power |
|---|---|---|---|---|
| CenturaHeat Steam 2 person indoor Pro-Line Direct | £1,750 | 2 | Electric sauna stove | 16A; must be hard-wired by a qualified electrician (no plug or extension lead) |
| CenturaHeat Traditional Steam 3 person indoor Pro-Line Direct | £1,999 | 3 | Electric sauna stove (wattage not stated in the feed we read) | 20A; hard-wired by an electrician |
| CenturaHeat 2 person hemlock indoor sauna with Harvia 2.3kW Pro-Line Direct | £3,542 | 2 | Harvia BC23E 2.3kW heater | About 10A at 230V; not a plug-in appliance |
| Holl's Utopia 3 indoor traditional sauna Steam & Oak | £4,999 | 3 | 4.5kW Holl's electric heater with stones; 65–90°C | Dedicated hard-wired supply by a qualified electrician |
| CenturaHeat 4 person hemlock indoor sauna with Harvia 6kW Pro-Line Direct | £4,417 | 4 | Harvia BC60E 6kW heater | 32A; not a plug-in appliance |
| Prism indoor sauna (4 person) Steam & Oak | £5,199 | 4 | 6kW traditional heater; 80–90°C | Dedicated 32A single-phase supply, fitted by a qualified electrician |
The shortlist
Lowest price we found
CenturaHeat Steam 2 person indoor
From £1,750 at Pro-Line Direct
£1,750 (listed as reduced from £2,397). Price checked 10 November 2026.
- Capacity
- 2 people
- Heat
- Electric sauna stove
- Power
- 16A; must be hard-wired by a qualified electrician (no plug or extension lead)
- Size
- 1200 × 1050 × 1900mm
- Warranty
- 1 year on electrics, 2 years on wood
At £1,750 (shown as reduced from £2,397), this two-person cabin was the cheapest traditional indoor sauna at the retailers we checked. Its 1200 × 1050mm footprint is the same as many two-person infrared cabins. Pro-Line Direct lists a 16A supply and says it must be hard-wired, not plugged in. The heater’s wattage wasn’t stated in the listing we read.
See current price at Pro-Line Direct Ad
Specs are as published by the retailer. We have not tested this product.
Three people under £2,000
CenturaHeat Traditional Steam 3 person indoor
From £1,999 at Pro-Line Direct
£1,999 (listed as reduced from £2,627). Price checked 10 November 2026.
- Capacity
- 3 people
- Heat
- Electric sauna stove (wattage not stated in the feed we read)
- Power
- 20A; hard-wired by an electrician
- Size
- 1500 × 1100 × 1900mm
A wider 1500 × 1100mm cabin for three at £1,999, on a 20A hard-wired supply.
See current price at Pro-Line Direct Ad
Specs are as published by the retailer. We have not tested this product.
Harvia heater, small supply
CenturaHeat 2 person hemlock indoor sauna with Harvia 2.3kW
From £3,542 at Pro-Line Direct
£3,542 (listed as reduced from £4,167). Price checked 10 November 2026.
- Capacity
- 2 people
- Heat
- Harvia BC23E 2.3kW heater
- Power
- About 10A at 230V; not a plug-in appliance
- Size
- 1200 × 1100 × 1900mm
- Build
- Canadian hemlock
This two-person Canadian hemlock cabin comes with a named heater, the Harvia BC23E (2.3kW), which Pro-Line Direct says draws about 10A at 230V. That’s a modest load for a traditional sauna, though it is still hard-wired. A version with a glass side wall and 3kW heater was £3,608.
See current price at Pro-Line Direct Ad
Specs are as published by the retailer. We have not tested this product.
Longest timber warranty
Holl's Utopia 3 indoor traditional sauna
From £4,999 at Steam & Oak
£4,999 including 4.5kW heater. Price checked 10 November 2026.
- Capacity
- 3 people
- Heat
- 4.5kW Holl's electric heater with stones; 65–90°C
- Power
- Dedicated hard-wired supply by a qualified electrician
- Size
- 155 × 110 × 196cm
- Build
- FSC-certified hemlock, 8mm safety-glass door
- Warranty
- 10 years on wood, 2 years on electrical parts
A three-person FSC-certified hemlock cabin, 155 × 110cm, with a 4.5kW heater over lava stones and an 8mm safety-glass door. Holl’s quotes 65–90°C and gives 10 years on the timber and 2 years on electrical parts. It needs a dedicated hard-wired supply.
See current price at Steam & Oak Ad
Specs are as published by the retailer. We have not tested this product.
Four people, Harvia 6kW
CenturaHeat 4 person hemlock indoor sauna with Harvia 6kW
From £4,417 at Pro-Line Direct
£4,417 (listed as reduced from £5,197). Price checked 10 November 2026.
- Capacity
- 4 people
- Heat
- Harvia BC60E 6kW heater
- Power
- 32A; not a plug-in appliance
- Size
- 1800 × 1500 × 1900mm
- Build
- Canadian hemlock
An 1800 × 1500mm hemlock cabin for four with a Harvia BC60E 6kW heater, on a 32A supply, at £4,417.
See current price at Pro-Line Direct Ad
Specs are as published by the retailer. We have not tested this product.
Design-led four-person cabin
Prism indoor sauna (4 person)
From £5,199 at Steam & Oak
£5,199 including 6kW heater. Price checked 10 November 2026.
- Capacity
- 4 people
- Heat
- 6kW traditional heater; 80–90°C
- Power
- Dedicated 32A single-phase supply, fitted by a qualified electrician
A four-person cabin with a culture-stone feature wall and a 6kW stove running at 80–90°C, on a dedicated 32A single-phase supply. £5,199.
See current price at Steam & Oak Ad
Specs are as published by the retailer. We have not tested this product.
Where to put an indoor sauna
- A level, solid floor that can take the cabin’s weight plus people. Tiled or vinyl floors are easier to keep clean than carpet.
- Ventilation. Harvia’s manuals say the air in a sauna room should change six times an hour, and the cabin kits include vents. Don’t box the cabin in tightly.
- Height. Most cabins here are about 1.9m tall. Check ceiling height and any sloping ceilings.
- Access. Kits arrive as panels. Measure doorways, stairs and landings before you buy.
- Near the consumer unit if you can. A shorter cable run means a cheaper installation.
Traditional or infrared?
A traditional sauna gets hotter and lets you make steam, but it takes longer to heat and needs a dedicated circuit. A plug-in infrared cabin is simpler to install, runs cooler (about 60–65°C for the models we’ve listed) and costs less to run per session. Our infrared buying guide compares eight of them.
Frequently asked questions
Can you have a traditional sauna inside your house in the UK?
Yes. Indoor traditional sauna cabins are sold as kits for spare rooms, garages, basements and home gyms. They need a level floor, space for ventilation, and a dedicated hard-wired electrical supply for the heater, installed and certified by a qualified electrician.
Do indoor saunas need planning permission or building regulations?
Putting a sauna cabin inside an existing room doesn't normally need planning permission. The electrical work does fall under Part P of the Building Regulations in England: a new circuit, or any alteration in a room containing a sauna heater, is notifiable, so use a registered electrician who can self-certify it.
What size heater does an indoor sauna need?
It depends on the room volume. The smaller cabins in this guide use 2.3–4.5kW heaters; the four-person cabins use 6kW. Heater manufacturers publish a minimum and maximum room volume for each model, so the cabin and heater should be matched.
Is an indoor sauna expensive to run?
Running cost is the heater's power multiplied by how long it's on and your electricity price. A 6kW heater at full power for an hour uses 6kWh, about £1.58 at the Ofgem cap of 26.32p per kWh. The thermostat cycles the heater once the room is hot, so a full session including warm-up typically costs less than running flat out the whole time. Our calculator lets you test your own figures.
Sources
We read each of these on or before 10 November 2026. Retailer links in this list are plain links, not affiliate links.
- Pro-Line Direct: CenturaHeat Steam 2 person indoor sauna
- Pro-Line Direct: CenturaHeat Traditional Steam 3 person indoor sauna
- Pro-Line Direct: CenturaHeat 2 person hemlock with Harvia 2.3kW
- Pro-Line Direct: CenturaHeat 4 person hemlock with Harvia 6kW
- Steam & Oak: Holl's Utopia 3
- Steam & Oak: Prism indoor sauna
- Approved Document P: Electrical safety – dwellings (2013 edition)
- Ofgem: energy price cap unit rates, 1 October to 31 December 2026