Under-stairs sauna, Clapham
Glass-fronted pool house sauna, Oxshott
Hybrid sauna, Virginia Water
Bespoke Saunas, Fully Installed
The Sauna Company has designed and installed bespoke saunas since 2011. We handle sauna installation from first sketch to first löyly: design, ventilation engineering, timber, heater, lighting and controls, built on-site to fit your space. More than 100 custom installations across London, Surrey and the Home Counties.
Fully installed saunas from £7,995 to £9,995 ex VAT, depending on size and design. Call 020 8058 0871 or book a free design consultation using the form below.
Why homeowners and architects choose us
- Built for your space, not from a catalogue. Every sauna is measured, drawn and built to fit: under stairs, in lofts, basements, garages, garden rooms and pool houses.
- Ventilation designed first. This is where most installers cut corners. We calculate air volume and heat distribution before choosing timber or heater, so the sauna heats evenly and stays healthy.
- Specified with the best Finnish heaters. HUUM, Harvia and Saunum, with Wi-Fi controls on request.
- Proper sauna timber. Thermo Aspen, Aspen, Alder, Thermo Alder, Nordic White Spruce and African Abachi: knot-free, low-resin and comfortable to touch at temperature.
- British Sauna Society member, with aftercare on every installation.
Sauna installation prices
A fully installed bespoke sauna costs from £7,995 to £9,995 ex VAT, depending on size and design. Larger saunas and premium types cost more. The final price depends on:
- Size and number of bathers (most home saunas are 1.2–2.4 m wide and 1–2.4 m deep; ideal height is 2.1 m)
- Type: traditional Finnish, infrared, hybrid, Himalayan salt or steam
- Indoor or outdoor, and how much building work the space needs
- Timber choice, glazing, benches and lighting
- Heater size and control system
Guide prices by sauna type (fully installed)
- Compact traditional or infrared: from £7,995 · 1–2 person · 3–5 days
- Infrared: from £9,995 · 1–4 person · 3–5 days
- Traditional Finnish: from £9,995 · 2–6 person · 3–5 days
- Wood-fired: from £12,995 · 2–6 person · 1–2 weeks
- Premium Finnish: from £14,995 · 2–6 person · 1–2 weeks
- Hybrid: from £14,995 · 2–6 person · 2–3 weeks
- Himalayan salt: from £18,995 · 2–6 person · 2–3 weeks
- Steam room: from £19,995 · 1–4 person · 2–3 weeks
An hour's session costs around £3 in electricity, and a properly built bespoke sauna lasts 30–40 years. You'll get a fixed written quote after your free design consultation. See more on our sauna prices page.
What's included in your sauna installation
- Free design consultation and site survey
- Design drawings and a 3D visualisation for your approval
- Ventilation design: air intake and extract positions sized for the room
- Insulation and vapour barrier
- Timber lining, floating benches and backrests
- Heater, stones and control panel
- Sauna-rated lighting (LED strip or fibre optic)
- Glass door and any glazed panels
- Delivery, installation, commissioning, first heat and clean
- User manual and as-installed drawings
- Aftercare support
What's not included
Usually carried out by your main contractor, or quoted separately on request:
- Building works, stud partitions and tiling
- New electrical circuit and connection by a qualified electrician
- Drainage or plumbing (needed for steam rooms and showers)
- Groundworks or bases for outdoor saunas
Our sauna installation process
- Free consultation. Tell us about your space and send photos and rough dimensions. We discuss size, type and budget.
- Survey and design. We measure, plan ventilation and electrics, and produce drawings and a 3D visualisation.
- Fixed quote. A clear written price with everything included listed.
- Preparation. Your builder prepares the room and power to our drawings; we coordinate with them.
- Installation. 3–5 days for traditional and infrared saunas; 1–3 weeks for premium Finnish, hybrid, Himalayan salt and steam builds.
- Handover. We commission the heater, run the first heat, clean, and walk you through the controls.
Recent sauna installations
Basement gym hybrid sauna, Virginia Water, Surrey
A hybrid Finnish and infrared sauna for a private basement gym. Knot-free Aspen interior with darker contrasting ceiling, floating benches and recessed lighting. HUUM HIVE MINI 10.5 kW heater plus three black ceiling-mounted infrared panels, all run from one HUUM UKU Glass Wi-Fi panel. Read the Virginia Water case study
Glass-fronted pool house sauna, Oxshott, Surrey
A two-person sauna for a residential pool house. Fully clad in Thermo Aspen, with legless floating benches, concealed LED lighting and an 8 mm clear glass door and side panel. HUUM CLIFF 9 kW heater with UKU Glass Wi-Fi control. Read the Oxshott case study
Under-stairs sauna, Clapham, London
An unused space beneath a staircase turned into a two-person sauna. Thermo Aspen in a vertical and angular pattern, three floating benches and LED strip lighting. HUUM CLIFF 10.5 kW heater with UKU Glass Wi-Fi control. Read the Clapham case study
See all our sauna case studies
Saunas we install
Indoor Finnish, infrared, hybrid, Himalayan salt, outdoor garden and wood-fired saunas, plus steam rooms and climate-controlled wellness spaces. Explore our bespoke saunas, outdoor saunas or sauna renovation.
Areas we cover
London, including Kensington, Chelsea, Notting Hill, Hampstead, Islington, Clapham, Richmond, Wimbledon, Kingston and Bromley. Surrey, including Weybridge, Virginia Water, Oxshott, Esher and Guildford. Plus Hertfordshire, Berkshire, Essex, Kent and larger projects across the UK.
Sauna installation FAQs
How much does sauna installation cost?
Fully installed bespoke saunas cost from £7,995 to £9,995 ex VAT, depending on size and design. Premium types such as hybrid, Himalayan salt and steam cost more. Price depends on size, type, timber, heater and how much preparation the space needs. You get a fixed quote after a free consultation.
How long does it take to install a sauna?
Once the room and power are ready, traditional and infrared saunas take 3–5 days to install. Premium Finnish and wood-fired saunas take 1–2 weeks; hybrid, Himalayan salt and steam rooms 2–3 weeks.
How much space do I need for a home sauna?
Most home saunas are 1.2–2.4 m wide and 1–2.4 m deep, with 2.1 m the ideal height. We've built compact saunas under stairs and in former WCs.
Traditional or infrared: which should I choose?
A traditional sauna heats the air; infrared warms the body directly. If you can upgrade your power supply, we usually recommend a traditional or hybrid sauna. Infrared suits spaces with only a standard 13A socket and no drainage.
How much does a sauna cost to run?
Around £3 for an hour's session, based on a 6 kW heater at 30p per kWh.
Do you install outdoor saunas?
Yes. We build outdoor and garden saunas, including conversions of existing garden sheds and garden rooms.
Can you work with my architect or builder?
Yes. We regularly supply drawings and specifications to architects, interior designers and main contractors, and coordinate on site.
More questions answered in our sauna FAQs.
Book your free sauna design consultation
Send us photos and rough dimensions of your space and we'll come back with ideas and a budget. Call 020 8058 0871, email info@saunacompany.co.uk, or use the form below.