Every outdoor sauna listing shows you one number. The cabin price. It sits there in large type looking like the answer, and it is roughly two thirds of the truth. The rest of the money goes on the base, the electrician, the delivery and the tin of exterior treatment, and none of it appears on a price tag. By the end of this guide you will have your own total for your own garden, built from an editable checklist rather than our guesses.
A note on where we stand: we sell outdoor saunas, so we benefit when the total looks manageable. That cuts both ways. Every figure below that comes from us carries a date, and where a cost depends on your site we tell you how to get the real number instead of inventing a national average.
The honest starting point: the cabin itself
As of 3 September 2026, our own compact three-person cabin, The Cabin Three, is priced at £4,295 for the electric version with a Harvia PC70 heater included, and £4,499 for the wood-fired version with a wood-burning stove and flue kit included. Those are live store prices on the day of writing and the heater sits inside them, which matters when you compare: some sellers list the cabin shell and price the heater separately, so a cheaper headline can hide a dearer total.
The wider UK market runs from small flat-pack cabins below this level to bespoke builds several times the price. We are not going to quote competitor numbers here, because prices move and a stale figure would mislead you within a month. Open three or four current listings yourself and check one thing on each: whether the heater, and for wood-fired models the flue, sit inside the quoted price.
The five costs that never make the price tag
1. Delivery
A sauna cabin does not travel like a parcel. Our electric cabin ships in one crate of 2.40 × 1.20 × 1.00 m weighing 690 kg, and a crate like that needs the right vehicle and a workable drop point. We price delivery from your postcode and access details and confirm the charge in writing before you pay, so for our range the honest number arrives before your money leaves. Whoever you buy from, get the delivery charge and the offload method in writing first. A quote that goes quiet about how 690 kg leaves the lorry is not a complete quote.
2. The base
The cabin needs a level, load-bearing base sized for the structure, the people inside it and your ground. There are three common routes: paving slabs on a prepared sub-base, a concrete pad, or a timber frame on ground screws. Which one your garden needs, and what it costs, depends on the ground under it, which is why we do not print a universal figure. Ask a local landscaper or builder to quote for the specific base, and show them the cabin footprint. Ours is 1.85 × 2.20 m externally; allow working room around it.
3. The electrician, for an electric sauna
The Harvia PC70 is a 6.8 kW heater and runs on a dedicated circuit: 230 V single-phase protected at 1 × 35 A, or 400 V three-phase at 3 × 10 A. Installing that circuit is notifiable work under Part P of the Building Regulations, so a qualified electrician designs, installs and certifies it. What drives the price up is rarely the connection itself. The cable run does it: a long trench to the far end of the garden costs more than the hook-up at either end. Get an itemised quote, and ask early about the route.
4. The stove installation, for a wood-fired sauna
Swap the electrician for a solid-fuel installer. A wood-burning stove and its flue fall under Approved Document J, so budget either a HETAS-registered installer who self-certifies the work or a building control notification with an inspection fee. If your address sits in a Smoke Control Area, check the rules for appliances and fuel before you order, because the answer belongs to your council, and to you as the householder.
5. Exterior treatment
Our cabins arrive with the exterior timber untreated, and photographs showing dark or honey-coloured cabins show finishes the owner applied. You choose the exterior system, buy it and apply it after assembly. Against the other lines this one is small, a treatment system and a weekend, but skip it and the weather will bill you far more later.
Build your own total
Edit the figures to match your quotes. The cabin line is pre-filled with our dated electric price; everything else starts at zero because it belongs to your site, not our imagination.
| Cabin (heater included) | £ |
| Delivery (quoted for your postcode) | £ |
| Base (local quote) | £ |
| Electrician or stove installer | £ |
| Exterior treatment | £ |
| Your installed total | £4,295 |
What it costs to run
For the electric version the arithmetic stays simple: heater power multiplied by time at full output multiplied by your electricity tariff. The PC70 draws up to 6.8 kW, so one hour at full power uses at most 6.8 kWh. At an example tariff of 25p per kWh, chosen for easy arithmetic rather than as a quote of any current rate, that hour costs about £1.70. Your bill states your actual rate; multiply from there, or let our sauna running costs guide do it: it carries the current Ofgem capped rate with its dates, worked monthly examples and an editable calculator. In practice the heater cycles rather than running flat out for the whole session, so the full-power figure works as a ceiling for budgeting, and the wood-fired version trades electricity for logs, which you buy locally and, in a Smoke Control Area, buy as authorised fuel.
Electric or wood-fired: the money difference
On our range the wood-fired cabin costs £204 more to buy as of the date above. The larger difference sits in the trades: the electric route needs the dedicated circuit an electrician installs, the wood route needs the Document J stove installation, and the two jobs are quoted by different people. Neither route escapes professional installation of the heat source. Choose by your site first, budget second: a garden with no easy cable route argues for wood, a Smoke Control Area with strict appliance rules argues for electric.
Getting it into the garden
Delivery, offload, moving the crate to the base, assembly and the electrician are five separate jobs with five separate costs, and only the first is included in the price. What each one involves, the crate figures to plan around and the delivery cost for your postcode are set out in our delivery and installation checklist.
Frequently asked questions
How much does an outdoor sauna cost in the UK?
Cabin prices vary widely across the market. Ours start at £4,295 with the heater included, as of 3 September 2026. The installed total adds delivery, a base, the electrical or stove installation and exterior treatment, and those depend on your site, which is why this guide gives you an editable checklist rather than one number.
What is the cheapest part people forget?
Exterior treatment. It costs the least of the five extra lines and gets skipped most often, and untreated timber outdoors pays for that mistake within a few seasons.
What is the most expensive surprise?
Usually the cable run for an electric sauna sited far from the consumer unit, or groundwork where the garden slopes. Both belong to the site, which is why quotes beat averages.
Is it cheaper to build a sauna yourself?
Sometimes, if you already own the skills and the tools, and the build still needs the same certified electrical or stove installation as a bought cabin. Price the professional lines first; they do not disappear because the timber was cut at home.
Sources
- Cabin prices: live Waldenhaus store listings, checked 3 September 2026.
- Approved Document P, electrical safety
- GOV.UK: Smoke Control Area rules
- HETAS competent-person scheme
Next step
Take the checklist above, collect your three site quotes, and you hold a real installed total for your garden. When you want the cabin line for it, the outdoor sauna range lists verified dimensions, what the price includes and the delivery process, with the charge confirmed in writing before you pay.