A Complete Guide for UK Business Owners

The UK's public sauna movement has exploded over the past few years. What was once largely confined to hotel spas and leisure centres has evolved into a diverse industry that includes beach saunas, woodland retreats, social wellness clubs, luxury hotels, boutique recovery studios and mobile sauna experiences. According to the British Sauna Society, public sauna culture is growing rapidly across the UK as consumers increasingly seek experiences centred around wellness, cold water therapy and community.

But while much attention is given to selecting the right sauna, heater or timber, experienced operators know that the building itself often determines whether a business succeeds.

A commercial sauna introduces challenges that most buildings were never designed for. High temperatures, humidity, heavy electrical loads, ventilation requirements, customer flow, accessibility, changing facilities and structural considerations all need careful planning. Choosing the wrong property can add tens of thousands of pounds to a project before the first customer walks through the door.

The good news is that many building types lend themselves exceptionally well to commercial sauna businesses. The key is understanding the strengths—and limitations—of each.

1. Industrial Units – The Most Flexible Option

If experienced sauna operators had to choose one type of building from scratch, many would start with an industrial unit.

Warehouses and light industrial premises offer something few traditional commercial properties can match: flexibility. They are typically built with reinforced concrete floors capable of supporting substantial loads, generous ceiling heights that simplify ventilation design, wide access doors for delivering prefabricated sauna cabins and electrical infrastructure that can often accommodate the higher demands of commercial heaters.

From an operational perspective, they also provide space to think beyond simply installing a sauna. Large open floorplans allow businesses to create multiple heat rooms, cold plunge areas, relaxation lounges, cafés, retail spaces and private treatment rooms without feeling constrained.

Perhaps the best-known example is Sauna Social Club in Peckham, London. Operating from a converted railway arch, the venue combines multiple saunas, cold plunge pools, social seating and wellness programming within an industrial setting. Rather than trying to disguise the building's character, the exposed brickwork and vaulted ceilings have become part of its identity, proving that industrial architecture can create an atmosphere every bit as memorable as a luxury spa.

The lesson is simple: customers rarely choose a sauna because the building was once a warehouse. They choose it because the space has been thoughtfully transformed into somewhere they genuinely want to spend time.

2. Hotels – Infrastructure Already Exists

Hotels remain one of the easiest environments in which to introduce commercial sauna facilities because much of the supporting infrastructure is already in place.

Reception desks, changing rooms, showers, toilets, lockers, commercial cleaning facilities and hospitality staff all exist before the first sauna is installed. Rather than creating a customer journey from scratch, operators simply integrate sauna experiences into an established guest offering.

Adding wellness facilities also makes commercial sense. Modern travellers increasingly prioritise health and wellbeing when choosing accommodation, and high-quality spa facilities encourage longer stays, higher room rates and attractive overnight wellness packages.

One excellent example is The Gainsborough Bath Spa in Bath. Built around the city's famous thermal waters, the hotel demonstrates how luxury accommodation and wellness experiences complement one another. While the thermal spa is its headline attraction, the wider wellness offering—including heat experiences—shows how hotels can successfully integrate saunas into an existing hospitality business.

Before installation, however, operators should always confirm that the building's electrical capacity, ventilation systems and plant rooms are capable of supporting additional commercial heating loads.

3. Shipping Containers – The Fastest Growing Trend

Few developments have shaped the UK's modern sauna movement more than the rise of the shipping container sauna.

Shipping containers offer an attractive combination of affordability, structural strength and flexibility. Their steel construction provides an excellent framework for heavily insulated timber interiors, while their modular nature makes them comparatively straightforward to transport and install. Many can be craned directly into position, reducing both installation time and site disruption.

For start-ups, this approach offers another major advantage: mobility. If a lease expires, a site becomes unavailable or customer demand shifts elsewhere, the sauna can often be relocated rather than abandoned.

Across Britain, container saunas have become particularly popular on beaches, marinas and temporary wellness sites where permanent construction may be impractical.

Operators such as Soul Water Sauna in Edinburgh and numerous independent beach sauna businesses have demonstrated how compact structures can deliver premium experiences when paired with thoughtful design, quality materials and exceptional locations.

Although shipping containers are relatively straightforward to convert, proper insulation, vapour barriers, ventilation and corrosion protection remain essential if the building is to withstand years of repeated heating cycles.

4. Waterfront Locations – Where the Location Becomes the Experience

Some commercial sauna businesses sell far more than heat.

They sell the opportunity to step directly from an 85°C sauna into the North Sea.

Coastal, riverside and lakeside locations have become some of the most sought-after destinations in British wellness because they combine traditional Nordic sauna culture with natural cold-water immersion. The surrounding landscape becomes part of the experience itself, allowing businesses to command premium pricing without necessarily increasing operating costs.

One outstanding example is Soul Water Sauna at Portobello Beach in Edinburgh. Customers move seamlessly between the warmth of the sauna and the cold waters of the Firth of Forth, creating an authentic contrast therapy experience that has helped establish the venue as one of Scotland's best-known public saunas.

Similarly, operators such as Sea Scrub Sauna in Dorset and Sauna Society have demonstrated how spectacular waterfront settings can become a business's greatest marketing asset.

These locations do, however, introduce engineering challenges. Salt air accelerates corrosion, coastal winds increase heat loss and exposure to the elements demands durable exterior materials. Marine-grade stainless steel fixings, treated timber and robust insulation become essential rather than optional.

5. Barn Conversions and Rural Retreats – Wellness Meets Nature

Few settings feel more appropriate for a sauna than the countryside.

Across Britain, disused agricultural buildings and former barns are being transformed into luxury wellness destinations that combine saunas with woodland walks, wild swimming, yoga and outdoor bathing.

Customers increasingly seek experiences that allow them to disconnect from urban life, and rural environments naturally reinforce the sense of calm many people associate with sauna bathing.

A strong example is The Wild Spa Wowo in Sussex, where woodland surroundings form an integral part of the visitor experience. Rather than treating the sauna as the attraction in isolation, the wider landscape becomes part of the journey, encouraging guests to spend several hours rather than simply attending a single session.

The principal challenge with rural sites is infrastructure. Electrical supplies, drainage, parking and accessibility often require significant investment before a sauna can even be installed. Nevertheless, the resulting destination can become difficult for competitors to replicate.

6. Gyms and Health Clubs – Recovery Is the New Luxury

Modern gyms are no longer simply places to exercise.

Increasingly, they are becoming complete wellness destinations where recovery is considered just as important as training itself.

Adding commercial sauna facilities allows gyms to increase the value of memberships while supporting members' recovery after strength training, endurance exercise and rehabilitation programmes. Existing shower facilities, changing rooms and reception areas also reduce construction costs compared with creating a standalone venue.

David Lloyd Clubs provide an excellent example. Many of their locations incorporate Finnish saunas and steam rooms alongside swimming pools, gyms and spa facilities, recognising that members increasingly expect premium recovery amenities as part of their overall fitness experience.

Similarly, high-performance training centres across professional football, rugby and Olympic sport now routinely integrate heat therapy into athlete recovery programmes.

For gym owners, the challenge is rarely installation—it is ensuring sufficient capacity during peak evening periods when demand for recovery facilities is highest.

7. Heritage Buildings – Beautiful but Complex

Historic buildings possess a character that is almost impossible to recreate.

Stone walls, vaulted ceilings, exposed timber beams and centuries of architectural history can create extraordinary wellness environments that immediately feel distinctive.

However, heritage buildings also present some of the greatest technical and regulatory challenges.

Installing modern ventilation systems, routing electrical supplies, introducing drainage and making structural alterations may all require listed building consent or approval from conservation officers. In some cases, even seemingly minor changes can become lengthy planning exercises.

Perhaps the UK's finest example is Thermae Bath Spa, where contemporary wellness facilities have been successfully integrated within one of Britain's most historically significant spa cities. The project demonstrates that heritage architecture and modern wellness can coexist beautifully—but only through careful planning, specialist engineering and close collaboration with conservation authorities.

Historic buildings reward patience, expertise and investment, but they should never be selected without fully understanding the regulatory responsibilities involved.

Access Matters More Than You Think

One of the most expensive mistakes in commercial sauna installation has nothing to do with planning permission or electrical supplies.

It is discovering that the sauna physically cannot reach its intended location.

Commercial sauna cabins often arrive as large prefabricated sections. Before ordering equipment, every route should be assessed carefully, including loading bays, external access roads, door widths, corridors, staircases, lift capacities and turning circles.

Many successful projects begin with a simple delivery survey. It is considerably cheaper to identify access issues during the planning stage than after a bespoke sauna has already been manufactured.

Can the Building Handle the Heat?

Commercial saunas generate substantial heat, and managing that heat correctly is just as important as generating it.

Without carefully designed ventilation, warmth and humidity quickly migrate into neighbouring rooms, creating condensation, damaging finishes and making reception areas uncomfortable for customers and staff alike.

A well-designed commercial installation requires fresh air intake, controlled extraction, effective moisture management and sufficient insulation to prevent unnecessary heat loss. Buildings with generous ceiling heights and adequate plant space generally make these systems much easier to install and maintain.

Good ventilation is not simply about customer comfort—it protects the building itself for decades to come.

Don't Overlook Electrical Capacity

While customers admire beautiful timber interiors, installers tend to look at something else first: the incoming electrical supply.

Commercial electric sauna heaters commonly range from 9kW to 18kW each, and larger facilities often operate multiple heaters simultaneously alongside lighting, ventilation systems, cold plunge filtration, reception equipment and catering facilities.

Before signing a lease, every prospective operator should establish:

• Is three-phase power already available?
• What is the building's maximum electrical capacity?
• Will the Distribution Network Operator require an upgrade?
• Is there sufficient capacity for future expansion?

Resolving these questions before work begins can save significant time and expense later.

Think Beyond Opening Day

Many operators initially plan for a single sauna before quickly discovering demand exceeds expectations.

The most successful businesses choose buildings with enough flexibility to accommodate future additions such as larger relaxation lounges, treatment rooms, cafés, retail areas, event spaces or additional sauna cabins.

Expansion is almost always easier—and cheaper—when considered from the outset rather than retrofitted several years later.

Final Thoughts

There is no single "perfect" building for a commercial sauna, but there are certainly buildings that make success considerably easier.

Industrial units provide unmatched flexibility, hotels benefit from existing hospitality infrastructure, shipping containers have transformed the UK's public sauna movement, waterfront locations create unforgettable customer experiences, rural retreats offer genuine escapism, gyms integrate naturally with recovery-focused wellness, and heritage buildings deliver character that modern construction simply cannot replicate.

The common thread between every successful operator is not the building itself—it is choosing a property that supports the entire customer journey while accommodating the practical demands of commercial sauna operation. Get the building right, and everything from installation to future expansion becomes significantly more straightforward.

Here's our summary of installation difficulty and typical fit out costs for each building type:

Building Type	Installation Difficulty	Typical Fit-Out Cost	Best For
Industrial Unit	⭐⭐☆☆☆	£££	Dedicated wellness clubs
Hotel	⭐⭐☆☆☆	££	Existing hospitality businesses
Waterfront	⭐⭐⭐⭐☆	££££	Premium destination experiences
Barn Conversion	⭐⭐⭐☆☆	£££	Luxury countryside retreats
Gym/Health Club	⭐⭐☆☆☆	££	Member recovery facilities
Heritage Building	⭐⭐⭐⭐⭐	£££££	Boutique spa experiences
Shipping Container	⭐⭐☆☆☆	££	Start-ups, mobile and coastal saunas