By The Sauna Company design team · Updated November 2026
A fully installed home sauna in the UK costs from £9,995 for an infrared or standard Finnish sauna. Premium Finnish, hybrid and red light saunas start from £14,995, Bio Combi from £16,995, and Himalayan salt saunas from £18,995, and climate-controlled saunas and steam rooms from £19,995.
All of these figures exclude VAT and builders' preparatory work such as partitions, flooring, drainage and electrical connections.
Key takeaways
- Infrared and traditional start at the same price. Aqua Spazio Radiata starts from £9,995 and usually needs no drainage or supply upgrade.
- Traditional saunas start from £9,995 too. That is our standard Finnish range (Aqua Spazio Sana). Premium Finnish and hybrid saunas start from £14,995, and Combi Bio from £16,995.
- Outdoor saunas cost more because of the enclosure. A garden-room style outdoor sauna is priced to the design.
- Five things drive price. Size, timber, heater and controls, glass, and access.
- Running costs are modest. Roughly £3.00 for an hour's sauna with a typical 6kW heater at 30p/kWh.
What do installed prices start from?
Prices are fully installed, excluding VAT and builders' work. These are guide starting prices; the final figure depends on the size and specification of your sauna. Guide prices for every range are on our sauna prices page.
Range
What it is
Guide price from (ex VAT)
Infrared sauna (Aqua Spazio Radiata)
40–60°C, HARVIA infrared panels, touch controls
£9,995
Standard Finnish sauna (Aqua Spazio Sana)
75–95°C, HARVIA Wall heater with built-in controls
£9,995
Garden cube or barrel sauna (Aqua Spazio Cubo)
Quick-install outdoor unit on level pavers
£12,995
Wood-fired outdoor sauna (Aqua Spazio Legna)
HARVIA M3 wood-fired heater, off-grid
£12,995
Premium Finnish sauna (Aqua Spazio Premio)
Frameless glass, Thermo Aspen or Thermo Alder, HARVIA or HUUM freestanding heater
£14,995
Bio sauna (Aqua Spazio Combi Bio)
50–60°C at 50–60% humidity
£16,995
Hybrid sauna (Aqua Spazio Hybrid)
Traditional heater plus ceiling glass infrared panels
£14,995
Red light and infrared sauna (Aqua Spazio Terapia)
Far infrared plus red and near-infrared panels
£14,995
Steam room (Aqua Spazio Vapore)
Fully tiled, generator outside the room
£19,995
Himalayan salt sauna (Aqua Spazio Salte)
Backlit salt panel wall
£18,995
Climate-controlled sauna (Aqua Spazio Saunum)
HUUM heater plus Saunum Base
£19,995
Outdoor sanctuary (Aqua Spazio Benessere)
Sauna, cold plunge, changing and lounge
Price on application
What is included in the price?
Our installed prices cover the sauna itself: FF-PIR insulation, vapour barrier and tape, wall and ceiling panelling, benches and headrests, the heater and its controls, lighting, the door and a thermo-hygrometer.
Every sauna also comes with our design package: air volume, heat loss and heater capacity calculations, ventilation layout drawings, door, glazing, cladding and bench drawings, electrical wiring schematics and an operation manual.
What is not included?
Your main contractor carries out the preparatory works to our drawings: partitions, floor tiling, drainage connections and any electrical supply upgrade. Budget for these separately, and ask your builder and electrician to price them from our drawings.
This is also why online "sauna cost" figures vary so much. Some include building work, and many quote a kit with no installation at all.
What drives the cost up or down?
- Size. A bigger room needs more timber, more insulation and a larger heater.
- Type. A good traditional sauna and a great Combi Bio sauna differ by roughly 1.5 times in price.
- Timber. Standard builds use Aspen or Alder in 90mm widths. Premium builds move to Thermo Aspen in 120mm widths, and bespoke builds can use 140mm or 160mm boards and finishes such as Dark Thermo Alder or Cedar.
- Heater and controls. A manual heater costs less than a Wi-Fi heater you can pre-heat from your phone.
- Glass, lighting and sound. Glass fronts and side panels, feature LED lighting, music and Wi-Fi connectivity all add cost.
- Access. A sauna in a loft or basement that is hard to reach takes longer to build.
None of this changes the most important part of the design. Whatever your budget, the ventilation has to be calculated properly, because a sauna that fills with stale, CO2-heavy air feels stuffy at any price.
How much do outdoor saunas cost?
Outdoor saunas cost more than indoor ones of the same size because you pay for a weatherproof structure as well as the sauna inside it. Our quick-install garden cube (Aqua Spazio Cubo) and wood-fired sauna (Aqua Spazio Legna) start at £12,995.
An outdoor sauna can also be built like a garden room, not a garden shed, and is priced to the design. You can add a steam room, changing area, seating, shower, WC, pantry, bar or gym.
We have seen our fair share of garden storage sheds that started life as a sauna, so we advise spending on the enclosure. Check permitted development rules for outbuildings before you settle on a size.
How much does a sauna cost to run?
An average family sauna has a 6kW heater and takes up to an hour to heat. At 30p/kWh, heating uses about 6kWh, or £1.80, and a full hour's sauna at home costs about £3.00.
Ofgem's price cap for 1 October to 31 December 2026 sets an average electricity unit rate of 26.32p/kWh for Direct Debit customers. At that rate, heat-up costs about £1.58 and an hour's sauna about £2.63. The cap is reviewed every three months, so check your own tariff.
Infrared saunas heat in 15–20 minutes, which keeps their running costs lower.
What did we build in Bromley?
In Bromley, a sauna for up to two people replaced three large storage boxes in a converted garage. It has horizontal Thermo Aspen cladding, one long high bench to lie on with a half-width step, concealed LED lighting and a Harvia wall-mounted heater with a built-in control.
A wall heater with built-in controls avoids the cost of a separate control unit and frees up floor space in a compact room.
Frequently asked questions
How much does a sauna cost in the UK?
A fully installed home sauna costs from £9,995 for an infrared or standard Finnish sauna. Premium Finnish and hybrid saunas start from £14,995, and Himalayan salt saunas from £18,995, and climate-controlled saunas and steam rooms from £19,995. Larger bespoke sanctuaries are priced on application. Prices exclude VAT and builders' preparatory work.
Is an infrared sauna cheaper than a traditional sauna?
Not on our guide prices: our infrared and standard Finnish ranges both start from £9,995. Infrared usually needs no drainage or electrical supply upgrade, though, which can reduce the builder's costs.
Why are outdoor saunas more expensive?
You are building a weatherproof outbuilding as well as a sauna. Garden cube and wood-fired saunas start from £12,995, and garden-room saunas are priced to the design.
How much does it cost to run a home sauna?
With a typical 6kW heater, heating uses about 6kWh: £1.80 at 30p/kWh, or about £1.58 at the current 26.32p/kWh price cap. An hour's sauna including heat-up costs about £2.60–£3.00.
Is the design included in the price?
Yes. Every sauna includes our design package, covering heat loss and ventilation calculations, layout drawings, electrical schematics and an operation manual. The initial consultation is free. More answers are on our sauna FAQ page.
Get a price for your space
Book a free design consultation, or email photographs and dimensions of your space to info@saunacompany.co.uk, or call 020 8058 0871, for an initial assessment. Guide prices for every range are on our sauna prices page.
Sources
- Ofgem — Changes to energy price cap between 1 October and 31 December 2026. Average electricity unit rate of 26.32p/kWh for Direct Debit customers.
- Planning Portal — Outbuildings: planning permission and building regulations. Permitted development limits that affect outdoor sauna size and cost.
- GOV.UK — Approved Document P: electrical safety in dwellings. Building Regulations guidance on electrical work in homes.
- Planning Portal — Electrics. When home electrical work must comply with the Building Regulations.