Sauna Kits UK: What's Actually in a Flat-Pack Sauna Kit (and What Isn't)
A flat-pack sauna kit is generally a collection of prepared parts for you to assemble on site, not a finished, connected sauna installation. The exact contents vary by model, so check the product specification before ordering and treat anything not explicitly listed as included as a separate cost or task.
What is usually in a flat-pack sauna kit?
Most kits include the main timber structure, with components supplied ready to assemble. Depending on the design, these may include:
- Pre-cut wall and roof sections or tongue-and-groove boards
- Structural timber and fixings
- Assembly instructions
- Internal sauna benches
- A door and any windows specified for that model
- Roof boards and, on some kits, a weatherproof roof covering
- Vent openings or components, depending on the design
The sauna heater is not automatically included. Nor should you assume that stones, controls, lighting, a bucket and ladle, or a thermometer are part of the package. Check the listing for each item, including whether a named heater is supplied with the stones and controls it needs.
Roofing also deserves a close look: some kits include the weatherproof finish, while others require you to buy it separately. Compare the full specification rather than relying on a product image, which may show optional extras.
What is not usually included?
The base and groundworks
Your sauna needs a firm, level, stable base suited to its footprint and weight. A properly prepared concrete base, paving on a compacted sub-base, or an appropriately built deck may be suitable, depending on the site and product. Grass or loose, uneven paving is not a reliable foundation.
Ground preparation, drainage and base construction are normally separate from the kit. Check the required base dimensions and tolerances in the product instructions, and allow for water to drain away rather than collect around the timber.
The electrical feed and connection
A traditional electric heater normally needs a fixed electrical connection, not an ordinary plug socket. The supply cable, dedicated circuit, protective equipment, isolator, any trenching and the final connection are generally separate arrangements.
Some traditional heaters may require a dedicated 32A feed, but the correct circuit depends on the heater specification and the cable route. Confirm requirements with a qualified electrician before ordering, and have the electrician determine the appropriate supply and installation.
Other items to budget for
- Heater, controls and stones, unless the listing confirms they are included
- Roof covering, if it is not specified as part of the kit
- Exterior timber treatment, where required by the instructions
- Extra tools, sealants, packers or lifting arrangements
- Assembly, electrical work and any site-specific ventilation alterations
Supplied ventilation openings are not necessarily a complete ventilation system. Follow the model’s instructions for airflow and heater clearances; do not block vents or add openings without checking the manufacturer’s guidance. Likewise, confirm whether the timber needs exterior treatment after assembly, and do not apply ordinary finishes to interior sauna surfaces unless the product instructions permit them.
Small or large: choosing a kit that fits
A compact kit can suit a smaller garden or a household that mainly expects one or two people to use it. A larger cabin gives more room for several users, but needs more garden space, a larger base and potentially a higher-capacity heater. These examples illustrate different sizes and styles; check each product’s current specification for dimensions, capacity and included items.
| Kit style | A product to consider | What to think about |
|---|---|---|
| Compact cabin | KAJO Ula Mini Outdoor Sauna | Check the internal layout and intended occupancy against your available space. |
| Small barrel design | Palmako Anita Barrel Outdoor Sauna | Consider the curved footprint and how you will position the entrance. |
| Compact cabin style | Stjärna Icon 125 Thermowood | A smaller option to compare when planning a dedicated garden sauna area. |
| Larger cabin | Norland Sundborn Outdoor Sauna | Allow for the building footprint, access and a correctly sized heater. |
If a standard layout does not suit your garden, explore the bespoke sauna guide for considerations around custom dimensions and tailored layouts.
Is DIY assembly realistic?
DIY assembly can be a practical choice if you have suitable tools, enough space to lay out components and help with handling larger sections. Read the instructions before delivery, check what tools and fixings are required, and plan to assemble the structure on a prepared base in suitable weather.
Be realistic about the split between carpentry and specialist work. A homeowner may assemble the timber structure, while an electrician handles the heater connection. If you would rather have help with the build, Simply Saunas offers flat-pack DIY kits as well as the option of expert nationwide installation; confirm what any installation service covers, particularly electrical work.
Siting your garden sauna
Before ordering, measure the intended position and check that the kit can be carried from the delivery point to the base. Leave practical room for the door to open, maintenance access and ventilation, and consider privacy, drainage and the route for the electrical supply.
Make sure the base is ready before delivery and check access for unloading. Delivery may be kerbside or pallet-based, so confirm the arrangements for your postcode and property. For more on planning, foundations, heater sizing and electrics, read the sauna buying guide.
For different garden building styles, browse the outdoor sauna range or compare log cabin saunas. You can also compare a Stjärna Icon 220XL with glass front and a Norland Abisko cabin when considering larger or different-format kits.
A practical checklist before you order
Ask the supplier to confirm:
- Which timber, roof components and weatherproof covering are included
- Whether the heater, controls, stones and lighting are included
- What base dimensions, level and access the model requires
- Which ventilation components are supplied
- Whether exterior timber treatment is required
- What delivery includes, and whether assembly or electrical work is separate
Simply Saunas provides fast, FREE UK delivery on orders over £50 to most UK postcodes, plus a Price Match Promise. If you are comparing a sauna kit UK customers can assemble themselves with an installed option, clarify the full specification and responsibilities first: the kit, base, electrical supply and installation are distinct parts of the project.
By Annika Thorne: Ghost-writer for Simply Saunas
Annika Thorne is a UK-based wellness space designer and lifestyle consultant with over fifteen years of experience specialising in authentic Scandinavian thermal experiences and outdoor living architecture. Raised between the UK and Finland, Annika developed a lifelong passion for the traditional Nordic sauna culture and its profound physical and mental health benefits from an early age. After completing her studies in interior architecture and environmental design in London, she dedicated her career to helping British homeowners transform their gardens into premium personal sanctuaries. Her specialised expertise spans the technicalities of traditional steam saunas, the precise engineering of modern infrared cabins, and the unique structural demands of wood-fired barrel saunas. Annika is deeply passionate about sustainable construction, thermal efficiency, and the physics of proper sauna ventilation, ensuring that every garden structure achieves the perfect, clean steam experience. Known for her approachable, knowledgeable, and collaborative writing style, Annika breaks down complex technical timber specification, material durability, and outdoor heating configurations into clear, practical guidance. She believes that a high-specification garden sauna is a life-changing investment in long-term wellbeing, and she is committed to making authentic wellness accessible to everyone across the UK. When she isn't evaluating the latest precision-milled timber designs from Europe's finest manufacturing facilities, Annika can be found exploring garden landscaping trends or enjoying a traditional, authentic wood-fired steam session in her own garden.
General Information and Wellness Disclaimer
The content provided across our website, articles, and guides is for general informational, educational, and inspirational purposes only. While we strive to maintain the highest standards of accuracy, the information shared, including insights on traditional thermal experiences, infrared technology, and general lifestyle benefits, does not constitute medical advice, health diagnosis, or a specific treatment plan. Always consult a qualified healthcare professional or your GP before introducing new thermal routines into your health regimen, particularly if you have pre-existing cardiovascular conditions, are pregnant, or are taking prescribed medication.
Technical, Planning, and Structural Guidance
Simply Saunas is a specialised online retailer of high-specification timber garden buildings and wellness structures. Any technical specifications, assembly tips, or structural insights featured in our articles are intended to serve as a practical overview. Every property, garden layout, and local landscape is unique; therefore, we strongly recommend consulting a qualified structural engineer, professional builder, or your local authority regarding specific ground preparation, electrical requirements, ventilation setups, or potential planning permissions. While we proudly connect our clients with a dependable network of independent expert installers to ensure absolute peace of mind, Simply Saunas does not directly perform installation or electrical services. All individual site surveys, electrical hookups, and structural assemblies remain the sole responsibility of the customer and their chosen independent contractors.