Outdoor Sauna Cost: How Much It Takes to Create a Backyard Spa Retreat

Transforming your outdoor space into a private wellness retreat is more achievable than ever. And for many homeowners, an outdoor sauna is the ultimate luxury feature to be added to your home.

If you’re looking for a relaxing area to unwind after a long day or a dedicated spot to support your health and wellbeing, a garden sauna can elevate your home in a truly meaningful way. 

But before starting the project, it’s important to understand the outdoor sauna cost and the factors that influence it.

At JML Garden Rooms, we design and build high-quality garden rooms across Scotland, including bespoke outdoor saunas. In this guide, we’ll walk you through what affects the price of an outdoor sauna, typical cost ranges, and what you can expect when choosing a professionally built garden sauna.

Let us help you make the right decision for your home, lifestyle, and budget!
 

What is an Outdoor Sauna? 

An outdoor sauna is a purpose-built heated space designed to help you relax, rejuvenate, and enjoy the wellbeing benefits of traditional sauna therapy. The best thing about this is you can do all of this from the comfort of your own garden. 

Unlike indoor units, an outdoor sauna is housed in a dedicated structure, giving you a peaceful, private space that can be used year-round.
 

Benefits of Having a Sauna in the Garden

Adding a sauna to your garden is a luxury upgrade, but it’s also a practical investment in your wellbeing, lifestyle, and home. A thoughtfully designed outdoor sauna offers a range of benefits, such as: 
 

A private wellness retreat at home

An outdoor sauna gives you space to relax, unwind, and switch off from the demands of daily life. Whether it’s part of your evening routine or a weekend ritual, having a sanctuary just a few steps from your back door makes self-care easier and more enjoyable.

Health and wellbeing benefits

Regular sauna use is known to help with muscle recovery, improved circulation, stress relief, and better sleep. Having your own sauna means you can enjoy these benefits anytime, without the need for gym memberships or spa visits.

Useful any time of the year

A well-insulated garden sauna is built for comfort, even during Scotland’s colder months. With the right materials and expert construction, you can enjoy consistent heat, efficient energy use, and a cosy atmosphere no matter the season.

Enhances your outdoor living space

A garden sauna creates a stylish focal point that complements landscaped gardens, garden rooms, or outdoor lounges. It becomes a feature you’ll enjoy for both relaxation and entertaining.

Can add long-term value to your property

High-quality outdoor saunas can increase the appeal and value of your home. With its energy-efficient and relaxing features, buyers will surely be interested in checking out a property with a garden sauna. 
 

Outdoor Sauna Cost in the UK: What to Expect

When planning a backyard spa, cost is an important factor to consider. Prices can vary depending on size, materials, heating type, and if you choose a prefabricated model or a fully bespoke build.

• According to an article from The Guardian, the starting price for an outdoor sauna in the UK is around £11,200. 

However, for homeowners seeking a more refined, long-lasting, and comfortable spa experience, a professionally built sauna offers substantial benefits. 
 

At JML Garden Rooms, our outdoor saunas are designed to deliver exceptional performance and insulation. Our personal garden sauna and wellness spaces cost £20,000, including:

• A beautifully crafted, insulated structure
• Easy-to-use electric sauna stoves
• Premium finishes and high-quality materials

You can also add optional features such as cold-dip tubs and outdoor showers, which comes at an extra cost.

These spaces are designed to support a healthier lifestyle, soothing the body and mind while helping boost immunity, promote muscle recovery, improve sleep, and enhance overall mental resilience.
 

Outdoor Sauna Designs by JML Garden Rooms

As a trusted garden room builder in Scotland, JML Garden Rooms can design a bespoke outdoor sauna that fits your individual needs, lifestyle, and available garden space. Whether you’re looking for a compact retreat for quiet relaxation or a larger pod for family and guests, every JML sauna is crafted with care and premium materials.

JML garden sauna rooms feature:

• Premium natural timber finishes and handcrafted detailing 
• High-performance insulation 
• Beautiful exterior cladding and materials
• Smart control options and energy-efficient heating (optional upgrades with additional fee).
   

JML garden sauna range

JML offers two bespoke sauna size options designed to suit different households and garden layouts:

• 2–3 person sauna with a 6 kW electric stove
• 4-person sauna with a 6 kW electric stove

JML can customise your sauna, allowing you to select the layout, finishes, and additional wellness features that best suit your vision.
 

Case Study: Bespoke Outdoor Sauna & Wellness Space in Edinburgh

For this Edinburgh client, JML designed and built a bespoke outdoor sauna and wellness zone that fits seamlessly into a compact city garden, proving that transformative relaxation spaces don’t require large footprints.

To create a complete home spa experience, the project included a HUUM electric stove, cold-plunge tub, outdoor copper shower, and a decked relaxation area. Every element was carefully planned to maximise comfort and usability.

Our team delivered:

• A fully insulated sauna structure finished in Thermopine cladding, paired with a matching timber privacy wall and durable Millboard composite decking.
• An extension and adaptation of the client’s existing decking, ensuring the new wellness area connected naturally with the garden’s layout.
• A beautifully warm and tactile interior featuring Thermopine wall lining and handcrafted aspen benches.
• A smart-controlled HUUM stove, allowing the client to preheat the sauna via their smartphone for effortless relaxation.
• A complete hot-and-cold therapy setup with a copper outdoor shower and cold-plunge tub.
• A sedum living roof to promote biodiversity and enhance views from above.
   

Bring Your Home Spa Vision to Life

Thinking about adding an outdoor sauna to your garden? We’re here to help you explore the possibilities. From compact designs to complete wellness suites, JML can turn your vision into reality.

Contact us to discuss your project and request a personalised quote!