How Much Does a Sauna Cost in the UK? (2026)

Whether you’re dreaming of a compact barrel sauna tucked into your garden or a fully bespoke wellness suite designed around your home, one question comes first: how much does a sauna cost in the UK?

The honest answer is that it depends. A sauna can cost anywhere from around £1,500 for a DIY materials-only build, through to £3,000–£15,000 for a ready-made outdoor sauna, and upwards of £35,000 for a fully bespoke, professionally designed and installed sauna. The price you’ll pay is shaped by the type of sauna you choose, the materials involved, the heater, and whether you’re building it yourself or having professionals handle every detail.

At Finnmark Sauna, we’re the UK’s first “Sauna from Finland” certified retailer, and we work across every level of the market, from supplying premium sauna timber and heaters to DIY builders, to designing and installing bespoke saunas for private homes, luxury spas, and commercial facilities. This guide breaks down every cost so you can find the right sauna for your space, your lifestyle, and your budget.

DIY Sauna: Materials-Only Costs (Build Your Own)

If you’re handy with tools and want to build your own sauna, purchasing materials separately is the most affordable route to sauna ownership in the UK. For a typical 2m x 2m indoor sauna, large enough for two to three people, you can expect to spend roughly £1,500 to £4,000 on materials alone, depending on the timber species and heater you select. This approach gives you complete control over the design, finish, and overall aesthetic of your sauna.

Sauna Timber and Cladding

The timber you choose will define both the look and feel of your sauna, and it represents one of the largest material costs. Finnmark supplies a comprehensive range of sauna wood sourced from specialist Nordic manufacturers, including options in both regular and thermo-treated species. Here’s what to expect price-wise for a 2m x 2m build:

Spruce

The most affordable option for sauna cladding and bench boards. Spruce is a light, clean-looking softwood with a mild scent. It’s an excellent choice for budget-conscious DIY builds and performs well when properly maintained. Expect to pay around £400–£700 for cladding, battens, and bench boards for a 2m x 2m sauna.

Alder

A step up in refinement, alder is a popular choice across Finland and the Baltics. It has a warm, honey-toned appearance, low thermal conductivity (so it won’t burn your skin on the benches), and a subtle, pleasant fragrance. Materials for a 2m x 2m build typically come in at around £500–£900.

Aspen

Aspen is prized for its clean, almost white colouring and its soft, comfortable feel underfoot and on the bench. It’s hypoallergenic and virtually knot-free, making it a premium choice. Budget approximately £550–£950 for a full 2m x 2m interior.

Western Red Cedar

Cedar is the go-to timber for those wanting a rich, aromatic sauna experience. It’s naturally resistant to moisture and decay, and has a beautiful reddish-brown grain. Cedar is a premium material, so expect to invest around £700–£1,200 for a 2m x 2m build.

Thermo-Treated Timbers (Thermo Alder, Thermo Aspen, Thermo Spruce)

Thermal modification uses heat and steam to permanently alter the wood’s cellular structure, dramatically improving its dimensional stability, moisture resistance, and lifespan. Thermo timbers are darker in tone and exceptionally durable – ideal for both indoor and outdoor saunas. Materials for a 2m x 2m build range from approximately £600–£1,300 depending on the species. Browse the full thermo timber range to compare options.

Sauna Heaters

The heater is the heart of your sauna, and choosing the right one is essential. Finnmark stocks authentic Finnish sauna heaters from leading manufacturers, including HUUM, Narvi, Helo, Kastor, IKI, and Tulikivi. For a 2m x 2m sauna (approximately 6–8 cubic metres), a heater in the 6–9 kW range is typically ideal.

Electric Sauna Heaters: The most popular choice for home saunas in the UK. Compact wall-mounted models from brands like Huum and Narvi start from around £400–£600, while premium design-led heaters such as the Huum Drop or Huum Hive can range from £800–£1,800. These heaters require a dedicated electrical supply (typically 32-amp) and should be installed by a Part P-certified electrician.

Wood-Burning Sauna Heaters: For those seeking the most authentic Finnish sauna experience, a wood-burning heater delivers an unmatched atmosphere. Prices range from approximately £700–£2,500, depending on the model and stone capacity. Wood-burning heaters also require a flue and chimney system, which adds £200–£500 to the overall cost.

Sauna Lighting

Lighting sets the mood for your sauna experience. LED sauna lighting kits, which are heat-resistant and designed specifically for sauna environments, typically cost between £100 and £400. Fibre-optic starlight ceiling kits offer a more dramatic, luxury feel and generally range from £300–£800. Explore the full selection of sauna lighting options to find the right fit for your build.

Additional Materials and Accessories

Beyond timber, heater, and lighting, a DIY sauna build will also require insulation (mineral wool is recommended), a vapour barrier, a sauna door (typically glass, from around £300–£700), sauna stones (£30–£80 per box), ventilation components, and finishing accessories such as corner mouldings and edge trims. Altogether, these additional items typically add £400–£1,000 to the total materials cost.

DIY 2m x 2m Sauna: Materials Cost Summary

Note: These estimates do not include labour or electrical installation costs. If you hire a carpenter or electrician, budget an additional £500–£2,000 depending on the complexity of your project.

Barrel Saunas: The UK’s Most Popular Outdoor Sauna

Barrel saunas have become one of the most sought-after outdoor sauna styles in the UK, and it’s easy to see why. Their distinctive cylindrical shape heats up faster than a traditional cabin design, circulates warmth more evenly, and makes a striking visual statement in any garden. At Finnmark, our barrel sauna range is crafted from 40mm Nordic thermo-spruce – a thermally modified timber that delivers exceptional weather resistance, dimensional stability, and a beautifully rich, natural aesthetic.

Finnmark Barrel Saunas are available in four sizes – Micro, Small, Regular, and Large,  accommodating everything from intimate solo sessions to social gatherings of six or more. All models are delivered flat-packed for convenient transport and can be assembled as a DIY project or with our optional installation service. You can configure each barrel with a choice of electric or wood-burning heater, semi-panoramic windows, LED lighting, and protective bitumen roof shingles.

Barrel Sauna Pricing

Prices are approximate starting points and will vary based on your chosen heater, optional extras, and delivery location. For exact, up-to-date pricing, visit our barrel sauna collection or call our team on +44 (0)20 8050 2895.

One of the key advantages of a Finnmark barrel sauna is the quality of the thermo-spruce timber used throughout. Unlike cheaper pine alternatives that can warp, crack, or degrade when exposed to the British weather, thermo-spruce has been heat-treated to resist moisture absorption and maintain its structural integrity for years. This is a material chosen for performance, not simply to keep costs down, and it’s one of the reasons Finnmark barrel saunas consistently outperform budget competitors.

For a deeper comparison of all barrel sauna models, dimensions, and specifications, read our Complete Guide to Finnmark Barrel Saunas.

Cube Saunas: Contemporary Design Meets Authentic Heat

Finnmark’s cube sauna range represents a more contemporary approach to outdoor sauna design. Where barrel saunas embrace a rustic, Nordic aesthetic, cube saunas feature clean lines, flat walls, and a modern architectural profile that integrates seamlessly with contemporary gardens and outdoor living spaces. 

Cube saunas typically offer more usable interior space than a barrel of equivalent footprint, with flat walls that make bench configuration and interior layout more flexible. They’re also well-suited to those who want a sauna that feels more like a garden room or an extension of their home. Finnmark offers both Indoor Cubes, as well as Outdoor Cube Saunas, allowing the customer to choose which is best suited for their property.

Pricing for cube saunas generally ranges from around £5,000 to £8,000 for a compact two- to four-person model, rising to £8,000–£15,000+ for larger configurations with additional features such as panoramic glazing, integrated changing areas, or premium timber upgrades. As with barrel saunas, your final price will depend on the heater, timber choices, and any optional extras you select.

The cube format is particularly popular with customers seeking a modern, understated look without compromising the quality of the sauna experience. Browse the full cube sauna collection to explore available models and configurations.

Outdoor Sauna Cabins: The Traditional Garden Retreat

For those who want a more spacious, traditional sauna experience, Finnmark’s outdoor sauna cabin range delivers. These cabin-style saunas resemble small standalone buildings and offer the most room for multi-level benching, integrated changing rooms, and a layout that closely mirrors the classic Finnish sauna tradition.

Outdoor sauna cabins are ideal for families, those who entertain regularly, or anyone who simply wants the most authentic and generous sauna environment in their garden. Prices for outdoor sauna cabins typically range from £10,000 to £19,000+, depending on the size, timber species, heater choice, and level of customisation. Larger cabin saunas with features like front terraces, panoramic windows, and premium interior finishes sit at the upper end of this range.

All Finnmark outdoor saunas are constructed from carefully selected Nordic timbers and are designed to withstand the demands of the UK climate. Whether you choose a barrel, cube, or cabin, every sauna is backed by Finnmark’s expert guidance and support. View the full home sauna collection to compare styles side by side.

Bespoke Saunas: Designed and Built Around Your Space

When a pre-designed sauna doesn’t quite fit, whether that’s because of an unusual room shape, a specific design vision, or the desire for a truly one-of-a-kind wellness space, a bespoke sauna from Finnmark is the answer. Our bespoke service covers everything from initial design consultation and 3D visualisation through to material selection, fabrication, and professional installation.

What Does a Bespoke Sauna Cost?

Finnmark's bespoke sauna projects typically start at £35,000. This is a baseline estimate, as each project is priced individually, and the final figure can increase substantially based on the scope and specification of the build. Factors influencing the final price include:

• The size and complexity of the space – a compact indoor sauna conversion is very different from a large outdoor wellness suite with an integrated cold plunge and shower.

• Timber selection – choosing thermo-treated alder or aspen throughout will cost more than spruce, and featuring wall panelling or decorative log profiles adds a further premium.

• Heater choice – a wall-mounted Huum Drop is a very different investment to a floor-standing IKI pillar heater with a 100kg+ stone capacity, or a bespoke Tulikivi soapstone heater.

• Glazing and architectural features – full-height glass walls, panoramic windows, custom doors, and integrated lighting designs all add to the build cost.

• Site preparation and services – electrical supply upgrades, drainage, ventilation ducting, structural alterations, and groundwork can all contribute to the overall project budget.

• Location and access – projects in London and the South East, or sites with difficult access, may carry higher labour and logistics costs.

It’s worth noting that bespoke sauna projects often evolve as clients refine their vision during the design process. What begins as a straightforward sauna room can grow to include features like custom bench fabrication, integrated audio systems, chromotherapy lighting, or adjoining steam rooms. This is entirely normal, and Finnmark’s design team works closely with every client to manage budgets transparently at each stage.

Finnmark has designed and built bespoke saunas for private residences, boutique hotels, elite sports facilities – including projects for Tottenham Hotspur – and high-end commercial spas. Every project is unique, and our team brings the same level of care whether the brief is a compact home sauna or a full commercial wellness installation. To discuss your project, get in touch for a free consultation.

How Much Does a Sauna Cost to Run in the UK?

Beyond the initial purchase price, it’s helpful to understand what a sauna costs to operate day-to-day. The good news is that running a home sauna in the UK is surprisingly affordable.

A typical electric sauna heater rated at 6 kW will consume approximately 9 kWh for a standard session (including a 30-minute warm-up and a one-hour bathing session). At the current average UK electricity rate of around 24.5p per kWh, that works out to roughly £2.00–£2.50 per session. If you use your sauna three times a week, your monthly electricity cost will be in the region of £25–£40, comparable to a gym membership, but with the sauna available whenever you want it.

Wood-burning saunas have no electricity cost for the heater itself, though you’ll need to budget for firewood – typically around £3–£5 per session, depending on your wood source and the size of the stove. Many wood-burning sauna owners find that sourcing seasoned hardwood locally keeps costs very manageable.

Annual maintenance costs are modest: a pot of sauna paraffin oil for interior treatment (£20–£40), an exterior wood stain or oil for outdoor saunas (£30–£60 per year), and occasional replacement of sauna stones every two to three years (£30–£80). With proper care, a quality sauna is a long-lasting investment that delivers value for 15–20 years or more.

What Factors Affect the Cost of a Sauna in the UK?

To summarise the key variables that determine how much you’ll spend:

• Sauna type: DIY materials-only builds are the most affordable. Pre-designed barrel, cube, and cabin saunas offer convenience and quality at a mid-range price. Bespoke saunas represent the premium end of the market.

• Timber species: Spruce is the most budget-friendly; thermo-treated timbers and Western Red Cedar command a premium but offer superior durability and aesthetics.

• Heater: A basic wall-mounted electric heater starts from around £400; premium Finnish heaters and wood-burning stoves can exceed £2,000.

• Size and capacity: A compact 2-person sauna costs significantly less than a 6–8 person family model.

• Installation: Self-assembly reduces costs; professional installation adds convenience but increases the budget.

• Extras and customisation: Panoramic windows, LED lighting, changing rooms, terraces, and premium accessories all add to the final price.

Why Choose Finnmark Sauna?

Finnmark is the UK’s first “Sauna from Finland” certified retailer – a distinction that guarantees the authenticity and quality of every product we supply. Founded by brothers Jake and Max Newport (known as “The Sauna Twins”), our team of 40+ specialists operates from our base in Durham, bringing genuine Finnish sauna expertise to every project. From sauna timber and heaters to complete barrel saunas, outdoor cabins, and fully bespoke installations, Finnmark is your single source for everything sauna in the UK.

We offer free delivery on orders over £500, free consultations for any project, 0% finance options on selected products, and dedicated aftercare, including servicing and maintenance contracts. When you invest in a sauna from Finnmark, you’re investing in something built to perform, built to last, and backed by people who genuinely live and breathe sauna culture.

Frequently Asked Questions About Sauna Costs in the UK

How much does it cost to build a sauna in the UK?

Building a sauna in the UK costs anywhere from £1,500 for a DIY materials-only build (using affordable timber and a basic electric heater) up to £35,000+ for a fully bespoke, professionally designed and installed sauna. Most homeowners purchasing a pre-designed outdoor sauna spend between £3,000 and £15,000. Visit our DIY sauna guide for step-by-step planning advice.

What is the cheapest type of sauna to buy in the UK?

The most affordable route is a DIY build using materials purchased separately, sauna cladding, a heater, insulation, and a door. For a pre-built sauna, a compact 2-person barrel sauna offers the best value, starting from around £3,000 including the shell structure. Infrared saunas are also available at lower price points, though they provide a fundamentally different experience to a traditional Finnish sauna.

How much does a barrel sauna cost in the UK?

Barrel saunas in the UK typically range from around £3,000 for a compact Micro model (1–2 person) to £7,000+ for a large 6–8 person barrel with extras. The price varies based on size, heater choice, and optional features such as panoramic windows and LED lighting. See the full Finnmark barrel sauna range for current prices.

How much does a bespoke sauna cost?

Bespoke saunas with Finnmark start from a baseline of £35,000 and can increase substantially depending on size, materials, heater specification, glazing, and site requirements. Every bespoke project is unique, and we provide transparent pricing throughout the design process. Enquire about a bespoke sauna to begin the conversation.

How much does it cost to run a sauna at home?

A typical home sauna session using a 6 kW electric heater costs approximately £2.00–£2.50 at current UK electricity rates. Used three times per week, that’s roughly £25–£40 per month. Wood-burning saunas cost around £3–£5 per session in firewood. Annual maintenance (wood treatment, stone replacement) adds a further £80–£180 per year.

Do I need planning permission for an outdoor sauna in the UK?

In most cases, an outdoor sauna falls under permitted development rights and does not require planning permission, provided it meets certain criteria: it must be within the curtilage of your property, not forward of the principal elevation, and not exceed 2.5 metres in height if within 2 metres of a boundary. However, rules can vary for listed buildings, conservation areas, and certain local authorities, so it’s always advisable to check with your local planning department before proceeding.

What is the best wood for a sauna?

The best wood depends on your priorities. Spruce is affordable and performs well for indoor saunas. Alder and aspen offer superior comfort and aesthetics. Western Red Cedar is naturally aromatic and moisture-resistant. For maximum durability, especially in outdoor applications, thermo-treated timbers (such as thermo alder or thermo spruce) are the top choice. Browse Finnmark’s complete sauna timber collection to compare species and prices.

Is a sauna a good investment for my home?

A home sauna can add genuine value to your property – particularly a well-designed outdoor sauna or a bespoke installation. Beyond property value, the health benefits of regular sauna use are well-documented: improved cardiovascular health, reduced stress, better sleep, muscle recovery, and enhanced immune function. Many sauna owners report that the daily value they receive far outweighs the initial cost, and most wish they had invested sooner.

Can I buy sauna materials from Finnmark and build it myself?

Absolutely. Finnmark supplies everything you need to build your own sauna – from sauna cladding and bench boards to heaters, lighting, doors, insulation, and accessories. Our DIY Build Your Own Sauna guide walks you through the entire process step by step. We also offer a Design & Materials service for those who want professional planning support before building themselves.

Does Finnmark offer finance on saunas?

Yes, Finnmark offers 0% finance options on selected products, making it easier to spread the cost of your sauna over time. Contact our team for details on current finance availability and eligibility.

Ready to find the right sauna for your home? Browse the full Finnmark collection, request a free consultation, or call us on +44 (0)20 8050 2895 to speak with our sauna experts.