You see an outdoor sauna listed online for £3,999. It looks perfect. But before you click “buy,” you need to know the truth: that price is just the starting point. The cost of owning a sauna involves groundworks, electrical installation, delivery, and ongoing running costs.
Many buyers are blindsided by the “hidden” costs of installation. In this transparent guide, we break down the full financial picture of sauna ownership in the UK for 2026. We look at the price of the kit, the cost of the electrician, and how much it actually costs to run a session so you can budget accurately.
1. The Kit Price: What You Get
Budget (£2,500 – £4,000): Usually thin-walled (28-38mm) spruce cabins. Often sold without a heater or shingles. Fine for summer use, expensive to run in winter.
Mid-Range (£4,500 – £7,000): Thermowood barrel saunas with 42mm+ walls, Harvia heaters, and roofing included. Good balance of quality and price.
Premium (£8,000 – £15,000+): Bespoke designs, large glass fronts, cedar wood, luxury interiors.
Tip: Always check if the heater and stones are included. A heater alone can cost £500.
2. The Hidden Installation Costs
This is where budgets often break.
The Base (£200 – £1,000): You cannot put a sauna on grass. You need a concrete pad, paving slabs, or a timber deck.
The Electrician (£500 – £1,500): This is the big one. An electric sauna heater (typically 6kW-9kW) cannot plug into a socket. It needs a dedicated armoured cable running from your fuse box to the sauna.
Factors affecting cost:
– Distance from the house (cable is expensive per meter).
– Digging trenches (labour intensive).
– Upgrading your fuse box (if it’s old).
The Wood-Fired Option: A wood-burning sauna saves on electrical installation (you might just need a small cable for lights), but the stove kit (chimney, heat shields) is usually £500-£800 more expensive to buy than an electric heater.
3. Running Costs: Electricity vs. Wood
How much does a session cost?
Electric (9kW heater):
Heat up time (45 mins) + Session (45 mins) = 1.5 hours.
Total energy: approx. 10-12 kWh (the heater cycles on and off).
At £0.28 per kWh: £2.80 – £3.50 per session.
Using it 3 times a week = approx. £40 per month.
Wood-Fired:
Fuel: About 8-10kg of dry wood.
Cost of logs: £3.00 – £5.00 per session (retail bags). Free if you have your own wood.
Wood is generally cheaper if bought in bulk crates, but electricity is more convenient.
4. Delivery Logistics
Delivery is often “kerbside only.”
If you order a pre-assembled sauna, you might need a crane or a forklift to get it into your garden. Crane hire can cost £300-£600 for a lift.
If you order a flat-pack kit, delivery is usually cheaper (£100-£200), but you “pay” with your own time assembling it (1-2 days).
Häufig gestellte Fragen (FAQ)
Is a wood burner cheaper to run?
Usually yes, especially if you buy wood in bulk. However, the initial purchase price of a wood stove system is higher than an electric heater setup.
Do I need insulation to save money?
Yes. Thicker walls (42mm+) act as insulation. Thin walls lose heat, making the heater work harder and driving up electricity bills. Don’t scrimp on wall thickness.
Does it add value to my home?
A high-quality, well-installed outdoor sauna is an attractive feature that can add value and saleability. A rotting shed-sauna does not.
Conclusion
To get a realistic budget for a quality outdoor sauna project, take the kit price and add £1,500-£2,000 for a proper base and professional electrical installation. It is a significant investment, but with running costs as low as £3 per session, it is a luxury that is cheaper than a gym membership in the long run.