How Much Does a Contrast Therapy Suite Cost in the UK?

The quick answer

A home contrast therapy suite in the UK costs from around £10,000 for a simple set-up (a ready-made sauna, a plunge tub with a chiller and a shower), to £25,000–£60,000 for a bespoke sauna and cold plunge built into an existing room, and £75,000 to well over £200,000 for a fully designed suite with sauna, steam room, built-in cold plunge, experience showers and a relaxation area.

Contrast therapy means moving between heat and cold: a sauna or steam room, then a cold plunge or cold shower, repeated in rounds. Interest has grown fast in the UK. According to the British Sauna Society, the number of public saunas doubled between 2023 and 2024, and Google searches for "home sauna" rose 37% between December 2024 and February 2025 (Summerhouse24). More homeowners now want the same experience at home.

Contrast therapy suite cost by level (2026)

Suite level	What's included	Typical cost
Entry	Ready-made indoor or garden sauna, plunge tub with chiller, outdoor or bathroom shower	£10,000–£20,000
Bespoke	Custom-built sauna in an existing room, built-in or premium cold plunge, rain shower, ventilation and electrics	£25,000–£60,000
Luxury wellness suite	Bespoke sauna and steam room, tiled cold plunge pool, experience showers, relaxation area, full air handling, lighting and controls	£75,000–£200,000+

These are typical ranges for London and the South East. The final figure depends most on how much building work the space needs, which is often more than the equipment itself.

What each part of the suite costs

The sauna

The heat side of most suites. UK price guides put a home sauna anywhere between £1,000 and £17,000 (HaMuch), with ready-made outdoor saunas at £3,000–£15,000 and fully bespoke, professionally designed and installed saunas from around £35,000 upwards (Finnmark Sauna). Timber species, heater quality (we install brands such as Harvia and Klafs), glazing, lighting and size all move the price.

The steam room

A gentler, humid heat that many people prefer to a sauna, or want alongside one. Pre-made steam units and kits sell for around £3,500–£7,000 before installation (HaMuch). A bespoke tiled steam room needs a fully waterproofed enclosure, a sloped ceiling to stop drips, a steam generator, drainage and ventilation, which makes it one of the most construction-heavy parts of a suite.

The cold plunge

The cold side, and where people most often under-budget. In the UK, an unchilled ice tub costs £100–£600, a tub with a chiller and filtration £2,500–£6,000, and a chiller on its own £900–£3,500 (Restore Rooms). The chiller is what lets you plunge every day without buying ice, and it is the single biggest price driver. A built-in, tiled or sunken cold plunge costs £15,000–£40,000 or more, because it needs a concrete or stainless shell, waterproofing, filtration and treatment as well as cooling.

Showers and the relaxation area

A cold bucket shower, rain shower or multi-function experience shower bridges heat and cold rounds. A relaxation area with heated loungers lets the body settle between rounds. Both are where a suite starts to feel like a private spa rather than separate pieces of equipment.

What drives the overall cost

The building work. Converting a room, garage or basement into a wet, hot, humid space means waterproofing, drainage, insulation and electrics. In many projects this costs more than the sauna and plunge themselves.

Ventilation. Saunas and steam rooms need properly designed air supply and extraction, and the surrounding room needs humidity control. Getting this wrong causes condensation, mould and damage to the house.

Electrical capacity. Sauna heaters, steam generators and chillers draw a lot of power, and older London homes often need a consumer unit upgrade or a new supply.

Water treatment. A plunge that is used daily needs filtration and sanitising to stay clean, especially if several people use it.

Finishes. Natural stone, mosaic, thermally modified timber and integrated lighting define a luxury suite, and price it accordingly.

Indoor or outdoor. Garden suites avoid internal building work but need weatherproofing, groundworks and longer cable and pipe runs from the house.

Running costs

The monthly running cost of a home sauna is typically £10–£30 (4walls), depending on size, insulation and how often you use it. A chilled plunge adds the electricity to hold the water cold, plus filtration and treatment; good insulation and a fitted lid make a big difference. A steam room uses power mainly while it is running, and water for each session. Designing the suite so that heat and cold equipment share well-insulated, well-ventilated space keeps running costs down.

Designing a suite that works

• Plan the circuit. Sauna or steam, then shower, then plunge, then rest, with as few steps as possible between them and non-slip floors throughout.

• Separate wet and dry. Keep the sauna's dry heat and the steam room's humidity apart, with ventilation designed for each.

• Think about who will use it. A suite for one person and a suite for family and guests need very different sizes and plunge capacity.

• Leave room for the plant. Chillers, steam generators and filtration need ventilated space and service access.

• Design it once. A suite designed as one system, by one team, costs less to build and run than separate products bought from different suppliers and fitted together.

  
  

Frequently asked questions

What is the cheapest way to start contrast therapy at home?

A ready-made sauna paired with a cold shower is the lowest-cost start. Adding a plunge tub with a chiller gives you a true cold immersion without filling it with ice each time.

Can I fit a contrast therapy suite indoors?

Yes, in a spare room, garage, basement or extension, provided the space can be waterproofed, ventilated and given enough electrical supply. A basement is often ideal because it is private and easy to keep cool.

Do I need planning permission?

Usually not for an indoor suite or a small garden sauna, but listed buildings, conservation areas and larger garden buildings can need consent, and Building Regulations apply to electrical and drainage work.

How long does it take to build?

A ready-made set-up can be installed in days. A bespoke suite usually takes several weeks to a few months, depending on the building work.

Is contrast therapy safe for everyone?

Not for everyone. Anyone with a heart condition, high or low blood pressure, or who is pregnant should speak to their doctor before using a sauna, steam room or cold plunge.

Design your contrast therapy suite with Aqua Spazio

Aqua Spazio designs and installs saunas, steam rooms, cold plunges and complete hot and cold therapy suites, alongside luxury swimming pools. Send us photos and rough dimensions of your space, and we'll come back with ideas and an itemised quote.

Call 020 8058 0871 or email spaziodesignlondon@gmail.com

Sources

• Summerhouse24: Cost to Build an Outdoor Sauna in the UK, 2026 (British Sauna Society figures, UK search growth)

• HaMuch: Home sauna and steam room costs (UK sauna and steam unit prices)

• Finnmark Sauna: How Much Does a Sauna Cost in the UK? (2026) (ready-made and bespoke sauna prices)

• Restore Rooms: Cold plunge pool cost: UK prices in 2026 (UK ice tub, chiller and built-in plunge prices)

• 4walls: Boosting Your Home's Value with a Sauna (sauna running costs)