Everything You Need to Know Before Buying A Barrel Sauna

If you've been dreaming of transforming your garden into a wellness retreat, a barrel sauna might be exactly what you need. At Finnmark, we've spent years helping homeowners across the UK create authentic sauna experiences in their own outdoor spaces.

This comprehensive guide will walk you through everything you need to know about our barrel sauna collection, from choosing the right size to preparing your site for installation.

What Makes a Barrel Sauna Special?

Barrel saunas have become increasingly popular in the UK, and for good reason. Their distinctive cylindrical design isn't just aesthetically pleasing; it's engineered for superior performance. The curved shape promotes efficient heat circulation, allowing hot air to flow naturally throughout the space rather than becoming trapped at the ceiling as it does in traditional square saunas.

This ingenious design means barrel saunas heat up more quickly and maintain temperature more efficiently than their cabin-style counterparts. At Finnmark, our barrel saunas can reach optimal bathing temperature in approximately 30 minutes to an hour, depending on the heater you choose and outdoor conditions.

The barrel shape also offers a 23% reduction in unused air space compared to a square sauna of similar floor dimensions. This compact efficiency translates to lower energy consumption and faster heat-up times, making your sauna experience both more sustainable and more convenient.

The Finnmark Difference: Nordic Thermo-Spruce Excellence

Not all barrel saunas are created equal. At Finnmark, every barrel sauna in our collection is crafted from premium Nordic thermo-spruce timber, specifically chosen for its exceptional performance in outdoor environments.

What is Thermo-Spruce?

Thermo-spruce undergoes a specialised thermal modification process that transforms ordinary spruce into a superior outdoor material. This chemical-free treatment involves heating the timber with controlled steam, permanently altering its cellular structure. The result is wood that offers:

• Unrivalled rot and moisture resistance – Essential for withstanding the British climate year-round.

• Exceptional stability and durability – Reduced warping, swelling, and shrinkage over time.

• Superior insulating properties – Helps maintain consistent heat whilst keeping the exterior comfortably cool.

• Enhanced natural beauty – The thermal process creates a distinctive rustic appearance with rich, consistent colouring.

Our thermo-spruce is sourced from sustainably managed Nordic forests where slow growth in cold climates produces timber with a tighter grain structure and added strength. We work with Thermory, the world's leading manufacturer of thermally modified wood, which x-rays each board to ensure there are no internal flaws before the thermal treatment begins.

40mm Thick Walls for Long-Term Performance

Whilst many barrel saunas on the market feature thin, single-layer walls, Finnmark barrel saunas are constructed with substantial 40mm thick Nordic thermo-spruce. This increased wall thickness provides better structural stability, improved thermal performance, and a more authentic sauna experience that will last for decades with proper care.

Choosing the Right Size: From Micro to Large

One of the most important decisions when purchasing a barrel sauna is selecting the appropriate size for your needs and available space. Finnmark offers a carefully curated range designed to accommodate different household sizes and garden layouts.

Micro Barrel Sauna (2 Person)

Dimensions: L: 150cm x Ø: 190cm x H: 204cm

Our most compact offering, the Micro Barrel Sauna is perfect for individuals, couples, or those with limited outdoor space. Despite its smaller footprint, it delivers an authentic Finnish sauna experience with all the therapeutic benefits you'd expect. This model is ideal for small gardens, patios, or balconies where space is at a premium.

Best for: Solo use or intimate couples' sessions, compact gardens, or as a starter sauna.

Small Barrel Sauna (2-4 Person)

Dimensions: L: 223cm x Ø: 194cm x H: 204cm

The Small Barrel Sauna strikes an excellent balance between space efficiency and comfort. With room for up to four people, this size offers flexibility, whether you prefer to stretch out alone or enjoy a relaxed session with family or friends.

Also available with a Relaxation Terrace extension, which provides a sheltered outdoor space for cooling down between sauna rounds, an authentic Nordic tradition that enhances the overall experience.

Best for: Couples who want extra space, small families, or those who enjoy both solo and social sauna sessions.

Regular Barrel Sauna (4-6 Person)

Dimensions: L: 223cm x Ø: 225cm x H: 204cm (standard) / L: 300cm x Ø: 225cm (with changing room)

Our most popular size, the Regular Barrel Sauna, provides generous space for family wellness sessions whilst maintaining efficient heating characteristics. This mid-range model offers the best of both worlds: spacious enough for comfortable group use, yet compact enough to heat efficiently.

The Regular size is available in several configurations:

• Standard model with a single sauna chamber.

• With Relaxation Terrace for an extended outdoor cooling space.

• With Changing Room for added privacy and convenience.

• Black Edition with striking contemporary aesthetics.

Best for: Families, regular social gatherings, or those who want flexibility in how they use their sauna.

Large Barrel Sauna (6-8 Person)

Dimensions: L: 300cm x Ø: 225cm x H: 204cm

The Large Barrel Sauna is our most spacious barrel offering, designed for those who want to recreate the full spa experience at home. With a capacity for 6-8 people, this model is perfect for entertaining, larger families, or anyone who simply appreciates extra room to move and relax.

Despite its generous proportions, the efficient barrel design still ensures relatively quick heat-up times and economical energy use compared to traditional square saunas of equivalent capacity.

Best for: Large families, frequent entertainers, hospitality settings, or wellness enthusiasts who want a true spa-quality experience.

Heating Options: Electric vs Wood-Burning

One of the most significant decisions you'll make is choosing between electric and wood-fired heating. Both options deliver authentic Finnish sauna experiences, but each has distinct advantages depending on your circumstances.

Electric Sauna Heaters

Electric heaters offer modern convenience and precise temperature control. They're the popular choice for most homeowners due to their ease of use and low maintenance requirements.

Advantages:

• Simple operation. Just set your desired temperature and wait.

• Consistent, controllable heat.

• No need to manage firewood or ash.

• Cleaner operation with no smoke or emissions.

• Generally, lower ongoing maintenance.

Requirements:

• Access to the electrical supply at the sauna location.

• Professional installation by a qualified electrician.

• Appropriate circuit protection and cabling.

Finnmark offers a range of premium electric sauna heaters from renowned Finnish manufacturers, including Huum, Narvi, and Helo. For barrel saunas, we typically recommend heaters in the 6-9kW range, depending on your specific model size.

Wood-Burning Sauna Heaters

For those seeking a more traditional, atmospheric experience, wood-burning heaters offer an authentic connection to centuries of sauna tradition. The process of building and maintaining the fire becomes part of the ritual.

Advantages:

• No electrical supply needed, perfect for off-grid locations.

• Creates an authentic, traditional ambience.

• The aroma of burning wood enhances the experience.

• Generally lower running costs (depending on firewood availability)

• Adds to the meditative, hands-on nature of the sauna ritual.

Requirements:

• Proper chimney installation and clearances.

• Regular cleaning of the flue and removal of ash.

• Suitable firewood storage.

• Compliance with local regulations regarding outdoor burning.

Finnmark offers wood-burning sauna stove bundles specifically designed for barrel saunas, complete with necessary chimney components and fittings.

Making Your Choice

If you have reliable electrical access and prefer convenience, an electric heater is typically the most practical choice. However, if your sauna location is off-grid or if you're drawn to the romance and ritual of a traditional wood-fired sauna, a wood-burning heater will serve you exceptionally well.

Many of our customers also cite the ongoing cost savings of wood heating as a deciding factor, particularly if they have access to affordable or free firewood.

Site Preparation: Getting Your Space Ready

Proper site preparation is crucial for the longevity and performance of your barrel sauna. Taking time to create the right foundation will ensure years of trouble-free enjoyment.

Choosing the Perfect Location

Before your sauna arrives, carefully consider where it will sit in your garden. Ideal locations offer:

• Level ground – Essential for proper assembly and long-term structural integrity.

• Good drainage – Prevents water pooling around the base.

• Reasonable access – Remember, your sauna arrives flat-packed but will still need space for delivery and assembly.

• Privacy – Consider sightlines from neighbouring properties.

• Proximity to utilities – If choosing electric heating, being closer to your power supply simplifies installation.

• Aesthetic appeal – Think about views from both inside and outside the sauna.

Foundation Requirements

Unlike traditional buildings, barrel saunas don't require concrete foundations or permanent footings. However, they do need a stable, level base. Acceptable foundation options include:

Compacted Gravel Base (Most Common)

• 100-150mm depth of compacted crushed stone or gravel.

• Provides excellent drainage.

• Cost-effective and straightforward to install.

• Can be completed as a DIY project.

Concrete Paving Slabs

• Provides a solid, level surface.

• Easy to clean around the sauna.

• Slabs must be properly levelled and cover the full footprint.

• Good option if you want a more finished appearance.

Poured Concrete Pad

• Most permanent option.

• Provides a perfectly level surface.

• Typically requires professional installation.

• Best for high-traffic or commercial applications.

Treated Timber Decking

• Creates an attractive outdoor living space.

• Must be structurally sound and properly supported.

• Decking should extend beyond the sauna footprint for easier access.

• Consider the additional weight load when designing your deck.

Important: What to Avoid

Never place your barrel sauna directly on grass, soil, or any unprepared ground surface. This will lead to:

• Moisture damage to the base.

• Uneven settling over time.

• Accelerated timber deterioration.

• Potential structural issues.

Even with our superior thermo-spruce construction, proper drainage and air circulation beneath the sauna are essential for maximum longevity.

Access Considerations

Finnmark barrel saunas are delivered flat-packed in sturdy OSB (oriented strand board) crates. The packaging dimensions vary by model but typically range from:

• Micro: 111 x 195 x 85 cm.

• Small: 111 x 227 x 85/102 cm.

• Regular: 125 x 304 x 102 cm (with changing room).

Ensure your delivery location has adequate access for a large vehicle, and that there's a clear path from the drop-off point to your chosen site. Most customers find that two able-bodied adults can move the components to the final location, though a sack truck or trolley makes the job considerably easier.

Delivery and Assembly: What to Expect

Understanding what happens from order to first session will help you plan appropriately and avoid surprises.

Delivery Process

All Finnmark barrel saunas arrive flat-packed in protective OSB crates, making transport and placement considerably easier than pre-assembled units.

Standard Delivery (Most Models): Our barrels are shipped using a palletised delivery service. Due to their size and weight, this typically means kerbside delivery, where you'll need to offload the packages from the delivery vehicle. We recommend having at least two people available on delivery day.

Moffett Delivery (Larger Models): Some larger models, such as the Regular with Changing Room, include Moffett delivery to most mainland UK postcodes. This service uses a vehicle with a rear-mounted forklift that can place your flat-packed sauna directly onto your prepared base (subject to site access and suitability).

Highland and Island Postcodes: Please note that shipping costs vary for Highland and Island locations. Contact our team for a specific quote for your postcode.

Direct-to-Site Service: For particularly difficult access situations or if you prefer white-glove service, we can arrange direct-to-site delivery at an additional cost. Contact our customer service team to discuss this option.

DIY Assembly

Finnmark barrel saunas are designed with DIY assembly in mind. Each kit includes comprehensive, step-by-step instructions with clear diagrams to guide you through the process.

Tools Required:

• Cordless drill/driver.

• Socket set or adjustable wrenches.

• Rubber mallet.

• Spirit level.

• Tape measure.

• Stepladder.

• Helping hands!

The assembly process follows a logical sequence:

1. Lay the foundation cradles on your prepared base.

2. Position the rear wall panel.

3. Install the floor boards across the cradles.

4. Begin placing wall staves (the curved side panels).

5. Install the front wall panel with the door.

6. Secure the staves with the tensioning bands.

7. Install roof shingles and weather protection.

8. Fit interior benches and accessories.

9. Install your chosen heater.

Pro Tips for Successful Assembly:

• Read through all instructions completely before beginning.

• Check that you have all components against the inventory list.

• Ensure your base is perfectly level; this makes assembly much easier.

• Don't fully tighten fixings until the entire structure is assembled.

• Have your spirit level handy throughout the build.

• Take your time; rushing leads to mistakes.

Professional Installation Service

Whilst our barrel saunas are designed for DIY assembly, we understand that not everyone has the time, tools, or confidence to tackle the project themselves. Finnmark offers professional installation services throughout the UK.

Our experienced installation teams bring centuries of combined construction experience and will ensure your sauna is assembled to the highest standards, fully weather-sealed, and ready to use.

Installation Service Includes:

• Complete assembly of your barrel sauna.

• Professional heater installation (electric heaters installed by qualified electricians)

• Weather-sealing and finishing.

• Waste removal and site tidying.

• Full handover and user guidance.

To receive a personalised installation quote for your specific location and model, contact our customer service team on +44 (0)20 8050 2895 or email info@finnmarksauna.com.

Heater Installation: Bringing Your Sauna to Life

Electric Heater Installation

Important: All electrical work must be completed by a qualified electrician in accordance with current UK Building Regulations (Part P) and BS 7671 wiring regulations.

Your electrician will need to:

• Install an appropriately rated supply cable from your consumer unit.

• Fit a dedicated circuit protection (typically 32A or 40A MCB, depending on heater)

• Ensure proper earth bonding.

• Install the heater control unit (internal or external, depending on model)

• Connect the heater element.

• Complete the necessary electrical certificates.

Most electric sauna heaters operate on 230V single-phase supply, though larger commercial models may require three-phase power. Always check the specific requirements of your chosen heater.

Wood-Burning Heater Installation

Installing a wood-fired stove requires careful attention to safety clearances and proper chimney installation:

Key Requirements:

• Minimum clearances from combustible materials (typically 200-300mm)

• Proper chimney installation with appropriate height and draw.

• Heat shield behind the stove if required by the manufacturer.

• Spark arrestor at chimney terminus.

• Fire-resistant floor protection in front of the loading door.

Our wood-burning stove bundles include all necessary chimney components, but you may wish to engage a professional installer, particularly if you're unfamiliar with wood stove installation. Local HETAS-registered installers are experienced with sauna stove installations and can ensure complete compliance with building regulations.

Customisation and Optional Extras

Finnmark offers several options to personalise your barrel sauna experience:

Lighting

Transform your sauna ambience with our LED lighting kit. Purpose-designed for the heat and humidity of sauna environments, these lights create a warm, welcoming glow whilst being energy-efficient and long-lasting.

Panoramic Windows

Several models offer panoramic window options, allowing you to enjoy garden views whilst bathing. These large glass panels flood the interior with natural light and create a stronger connection with your outdoor space.

Relaxation Terraces

Models with integrated relaxation terraces provide a sheltered outdoor area perfect for cooling down between sauna rounds. This mimics the authentic Nordic sauna tradition of alternating between heat and cold, essential for maximising the cardiovascular and wellness benefits.

Changing Rooms

Barrel saunas with integrated changing rooms offer added privacy and convenience. The separate space provides somewhere to undress away from the heat, store towels and robes, and transition comfortably between your home and sauna.

Maintenance: Protecting Your Investment

Nordic thermo-spruce is exceptionally durable, but regular maintenance will ensure your barrel sauna remains beautiful and functional for decades.

Interior Maintenance

After Each Use:

• Wipe down benches to remove moisture.

• Leave the door open to allow the interior to dry completely.

• Remove any debris or fallen leaves.

Weekly (with regular use):

• Wipe interior surfaces with a clean, damp cloth.

• Check heater stones and rearrange if needed.

• Inspect door seals and weather strips.

Every 6-12 Months:

• Apply sauna paraffin oil to interior benches and walls.

• This nourishes the timber and helps prevent drying and cracking.

• Creates a subtle water-resistant barrier that repels moisture.

Exterior Maintenance

Every 1-2 Weeks:

• Brush away any leaves, debris, or spider webs.

• Check drainage around the base.

Annually:

• Apply exterior wood treatment or stain to protect against UV damage and weathering.

• Inspect roof shingles and replace any damaged sections.

• Check all fixings and tighten tensioning bands if needed.

• Inspect door hinges and locks for smooth operation.

Location-Specific Considerations: If your sauna is in a particularly exposed, coastal, or windy location, you may need to increase the frequency of exterior treatments. The British climate can be harsh, and proactive maintenance is always preferable to reactive repairs.

Heater Maintenance

Electric Heaters:

• Check and rearrange sauna stones every 50-100 hours of use.

• Replace damaged or crumbling stones.

• Have electrical connections inspected annually.

• Replace heating elements according to manufacturer guidance (typically every 3-5 years).

Wood-Burning Heaters:

• Remove ash after each use once cool.

• Clean chimney and flue annually to prevent creosote build-up.

• Check door seals and replace if degraded.

• Inspect the chimney for damage after storms

Long-Term Value and Investment

When considering a barrel sauna, remember that a quality installation significantly enhances your property value whilst providing a dedicated outdoor wellness space. Unlike many garden features, a sauna creates a functional retreat that can be enjoyed year-round, in all weathers.

With proper maintenance, a Finnmark barrel sauna will serve your household for 20-30 years or more. The robust Nordic thermo-spruce construction and quality craftsmanship ensure lasting performance and enduring appeal.

Planning Permission and Regulations

Most barrel saunas fall under Permitted Development rights in the UK and don't require planning permission. However, there are important exceptions and regulations to be aware of.

Permitted Development Criteria

Your barrel sauna is typically permitted development if:

• It's positioned more than 2 metres from your property boundary.

• The overall height doesn't exceed 2.5 metres (or 3 metres for pitched roofs).

• It covers less than 50% of your garden area.

• You don't live in a listed building or conservation area.

• It's for domestic use (not a business).

When You May Need Permission

You should check with your local planning authority if:

• Your property is listed or in a conservation area.

• You're planning to install it in a front garden.

• The sauna will be visible from a public highway.

• You live in a flat or maisonette.

• Your property has restricted covenants.

Building Regulations

Barrel saunas for domestic garden use typically don't require Building Regulations approval as they're considered temporary structures without permanent foundations. However, electrical installation must comply with Part P of the Building Regulations and should be certified by a qualified electrician.

Neighbour Considerations

Whilst not a legal requirement, it's courteous to inform neighbours of your plans, particularly regarding:

• Smoke from wood-burning heaters (if applicable)

• The sauna's position and any impact on their privacy.

• Any temporary disruption during delivery and installation.

Insurance

Inform your home insurance provider about your sauna addition. Most insurers will add it to your policy without significant premium increases, but it's essential that they're aware of the structure for coverage purposes.

Your Sauna Experience: Establishing a Routine

Regular use of your barrel sauna can become an enjoyable part of your daily or weekly routine. Many sauna enthusiasts recommend:

• 2-4 sessions per week for regular users.

• 15-20 minutes per session initially, building up as you become accustomed to the heat.

• Proper hydration before and after each session.

• Cooling periods between rounds if enjoying multiple sessions.

Remember that everyone's sauna experience is personal and unique. Take time to discover what temperature, session length, and frequency work best for you. Always listen to your body and exit the sauna if you feel uncomfortable or unwell.

If you have any health concerns, it's always advisable to consult your doctor before beginning regular sauna use.

Why Choose Finnmark?

Expert Guidance

We're not just sauna suppliers, we're sauna specialists. Brothers Jake and Max Newport (known in the industry as "The Sauna Twins") founded Finnmark out of frustration with the UK's lack of authentic sauna expertise. Today, we're recognised as one of the country's leading authorities on traditional Finnish sauna culture and construction.

Our team offers free, no-pressure consultations to help you select the right model, plan your installation, and answer any technical questions. We're here to ensure your sauna journey is as relaxing as the destination.

Authentic Nordic Quality

We source our materials directly from Nordic manufacturers who have spent generations perfecting their craft. Our partnership with Thermory ensures every piece of timber in your barrel sauna meets the highest standards of quality and sustainability.

Comprehensive Support

From initial enquiry through delivery, installation, and beyond, Finnmark provides ongoing support:

• Free technical consultations.

• Detailed assembly instructions and videos.

• Optional professional installation services.

• Responsive after-sales support.

• An extensive collection of educational content and guides.

Proven Track Record

With thousands of saunas installed across the UK, from private homes to luxury spas and commercial wellness spaces, our expertise is built on real-world experience. Our customer reviews speak to the quality of both our products and our service.

Frequently Asked Questions

Can I use a barrel sauna in winter?

Yes, absolutely. Barrel saunas are designed for year-round use and perform exceptionally well in winter. The Nordic thermo-spruce construction withstands freezing temperatures, snow, and ice without issue. In fact, many sauna enthusiasts prefer winter sessions. There's something particularly invigorating about the contrast between the warm sauna interior and crisp winter air. Do note that heat-up times may be slightly longer during very cold weather, but once at temperature, your barrel sauna will maintain heat efficiently throughout your session.

How long does a barrel sauna last outdoors?

With proper maintenance, a Finnmark barrel sauna will typically last 20-30 years or more in outdoor conditions. The key to longevity is regular care: annual exterior wood treatment, periodic interior oiling, and keeping the drainage around the base clear. Our Nordic thermo-spruce timber is specifically treated to resist rot, moisture, and weathering, far outlasting untreated wood alternatives. Many of our customers have saunas that look as good after 10 years as they did on day one.

Do barrel saunas leak in heavy rain?

Quality barrel saunas like those from Finnmark are designed to shed water naturally thanks to their curved shape and properly installed roof shingles. When correctly assembled with all weather seals in place, leaking shouldn't be an issue. The barrel design is actually superior to square saunas for water management; rain runs off the curved surface rather than pooling. We do recommend checking and maintaining the roof shingles annually, as they're your primary weather protection. Any minor gaps between staves will naturally seal when the wood swells during use.

What's the difference between a 4-person and 6-person barrel sauna?

The main differences are interior space and diameter. A 4-person barrel (our Regular model at 225cm diameter) provides comfortable seating for 2-4 people with room to move, whilst a 6-person barrel (also 225cm diameter but longer at 300cm) offers significantly more bench length and space. If you typically sauna alone or with a partner but occasionally host friends, the 4-person is ideal. If you have a larger family or regularly enjoy group sessions, the 6-person provides that extra room without feeling cramped. The larger model does take slightly longer to heat, but remains efficient due to the barrel design.

Can I move a barrel sauna after it's installed?

Yes, one of the advantages of barrel saunas is their relative portability compared to permanent cabin structures. Because they're assembled with tensioning bands rather than permanent fixings and don't require concrete foundations, barrel saunas can be disassembled and relocated if needed. This typically requires 2-3 people and an afternoon's work. It's a significant undertaking, but entirely feasible, particularly useful if you move house or want to reposition the sauna in your garden. Just ensure the new location has a properly prepared, level base ready for reassembly.

How often do I need to replace the sauna stones?

Sauna stones typically need replacing every 1-2 years with regular use, though this varies depending on usage frequency. You'll know it's time when stones start crumbling or breaking apart. During regular use, it's good practice to rearrange the stones every few months to ensure even wear and optimal heat distribution. When adding water for steam, always check that the stones are in good condition; damaged stones with cracks can explode when water is added. We recommend keeping a spare bag of stones on hand so you're never caught out.

Will a barrel sauna increase my property value?

Quality outdoor saunas are increasingly desirable features that can enhance property appeal and value. Whilst exact figures vary by location and property type, a well-maintained barrel sauna demonstrates thoughtful garden development and lifestyle amenity that appeals to buyers. Beyond resale considerations, many homeowners find that the daily enjoyment and functionality make it worthwhile regardless of the property value impact. A sauna transforms an underutilised garden space into a year-round retreat. Something particularly valuable in the UK climate.

Do I need to treat the wood before first use?

Your Finnmark barrel sauna arrives with the Nordic thermo-spruce already treated through the thermal modification process, so it's ready to use immediately after assembly. However, we do recommend applying sauna paraffin oil to the interior benches and walls before your first session. This adds an extra layer of protection and helps the wood develop a beautiful patina over time. For the exterior, whilst not essential before first use, applying an outdoor wood treatment within the first few months will help protect against UV damage and weathering, particularly if your sauna is in full sun or an exposed location.

Ready to Begin Your Sauna Journey?

A barrel sauna is more than a garden feature; it's an investment in your daily wellness, a space for connection with loved ones, and a sanctuary from the demands of modern life. Whether you're drawn to the compact efficiency of our Micro model or the spacious luxury of our Large barrel sauna, Finnmark has the expertise and products to bring your vision to life.

Next Steps

1. Browse Our Collection: Explore our complete range of barrel saunas to find the perfect size for your space and lifestyle
   
   

2. Choose Your Heater: Decide between electric and wood-burning options
   
   

3. Plan Your Site: Ensure you have a suitable location and a prepared base ready for delivery
   
   

4. Get In Touch: Contact our team for personalised advice, installation quotes, or to place your order

• Phone: +44 (0)20 8050 2895

• Email: info@finnmarksauna.com
  
  

5. Join the Community: Follow us on social media for inspiration, tips, and stories from fellow sauna enthusiasts