The Cabin Three Outdoor Sauna, 44 mm Solid Spruce, Harvia Heater Included
Harvia PC70 heater and 20 kg of stones included
Most outdoor saunas in the UK are listed without a heater. Adding one usually costs another £529 to £1,770. This one is priced with the heater and its stones already in it.
01Choose your heater
Both heaters are matched to the The Cabin Three. The PC90 heats faster from cold and needs a 40 A supply instead of 35 A. The dedicated supply and final connection by a competent electrician are not included.
02Choose your door
The black door comes with Black Edition. No need to add it twice.
03Choose your extras optional
Your build
You arrange the prepared base and the fixed electrical connection. On-site assembly is not included.
Made to order · the factory builds it in 10 days before transit.
Electric heater setupDedicated 35 A circuit, 3 × 6 mm² cable, installed and certified by a competent electrician. Not included in the price.
- The heater runs on 230 V single-phase or 400 V three-phase. Most UK homes use the single-phase option.
- Harvia specifies rubber cable of type H07RN-F or equivalent. PVC-insulated cable is not permitted.
- Final cable sizing, protective device and certification are the electrician’s call under BS 7671.
- The room needs 1900 mm of height and 100 mm of clearance around the heater, 950 mm above it.
- The supply and the connection are not in the price of the sauna.
What the price includes
Most outdoor saunas in the UK are listed without a heater. Adding one usually costs another £529 to £1,770. This one is priced with the Harvia and its stones already in it.
No surprises on delivery day
Everything in one crate — and the four jobs that stay yours.
Here is the whole list, both halves of it. The right-hand column is the part most sellers leave for the delivery day.
In the crate
- ✓Solid spruce cabin, 44 mm walls
- ✓Alder benches and backrests
- ✓8 mm toughened glass door with lock
- ✓Harvia PC70 heater, 6.8 kWMost UK sellers charge for this separately
- ✓20 kg of sauna stones
- ✓Shingle roof, timber floor and base frame
- ✓Steel tension straps with tensioners
- ✓Ventilation, steps and all fixings
Arrange yourself
- —Electrical connection and certificationQualified electrician, Part P
- —Wood preservative or stainThe cabin ships untreated
- —Bituminous sealant for the roof
- —Expanding foam
- —Foundation or base slabA firm, level surface is enough
Every part in the crate
Taken from the factory assembly manual for this model, not from a sales sheet. Sizes in millimetres.
Structure
- Kiln-dried spruce wall beams, 44 mm profilethe walls themselves
- Header beam2000 × 220 × 54 mm
- Steel tension bands, 0.7 mm2, with 4 tensioners, 2 threaded rods and 4 nuts
- Corner brackets and roof battenspre-cut
Inside
- Alder bench, long2100 × 550 × 94 mm
- Alder bench, short990 × 550 × 94 mm, makes the L
- Bench legs520 × 45 × 45 mm, 12 of them
- Spruce floor panel1450 × 950 × 35 mm
Door and air
- Toughened glass door in its frame, 8 mm1770 × 690 × 70 mm
- Door handle set1
- Alder vent valve120 mm
- Vent grille1
- Stainless drain grate80 × 80 mm
Roof
- Bitumen shingles54
- Door and corner trimspre-cut to length
Fixings
- Nails400
- Screws in five sizes570 in total
- Caps8
- Illustrated assembly instructions1
Not included
- Bituminous sealant and timber preservativeyou buy the finish you want; the cabin ships untreated
- High-temperature silicone and expanding foamfor sealing
- Mineral wooloptional extra heat shielding
- The wood-burning stove installation seta separate factory kit
- A cement board, 60 × 40 cmonly if you take a wood-burning stove
- The electrical supply and its connectiona qualified electrician, to BS 7671
- Toolscordless driver with TORX T25 and PZ2 bits, Ø8 drill bit, jigsaw, tape, level, rubber mallet, knife, two spanners, sealant gun, brush
The Harvia PC70 heater and 20 kg of stones are in the price. The full parts list, with every screw counted, is in the assembly manual.
How it arrives
One crate, on a pallet.
The cabin is flat-packed into a single timber crate — wrapped, banded and strapped, not handed over as loose bundles. It comes off the lorry at the kerb on that pallet, so the approach to your plot matters as much as the plot itself.
| Crate | 2.4 × 1.2 × 1.0 m |
| Weight | 690 kg |
| How many | One crate per sauna |
| Delivery | Kerbside, on the pallet |
Before it arrives
The three numbers that decide your site
35A
Its own circuit, wired by a competent electrician
The heater needs a dedicated 35 A supply in 6 mm² rubber H07RN-F cable — the same order of supply as an electric shower. PVC cable is not permitted. Electrical work is not included in the price, so get a quote before you order.
185 × 220 cm on the ground
That is 4.1 m² on the ground. It needs a firm, level base — a slab, paving or compacted gravel all work — and the floor and base frame come with it. Planning rules are a separate question: check the Planning Portal and your local authority before you install it.
690kg
One crate, three pallet spaces
It travels as a single protective crate, 240 × 120 × 100 cm, and comes off the lorry on a Moffett to the nearest safe hard-standing point. Grass and soft ground do not count as hard-standing. Delivery is calculated by postcode at checkout.
All measurements are approximate.
Fit and scale
Three people inside a 1.85 × 2.20 m footprint.
The Cabin Three is the shortest cube in the range. The 2.20 m width does the work; the 1.85 m length keeps it usable in a small garden. The sauna room takes 1.75 m of that length — there is no separate changing lobby at this size.
| External footprint | 1850 × 2200 mm |
| Sauna room depth | 1750 mm |
| Internal clear width | 2060 mm |
| Door opening | 1770 × 690 mm |
| Capacity | Up to 3 people |
| Bench tiers | One |
A proportional guide to the footprint, not an installation drawing. External height is left off deliberately — the factory drawings do not carry it, and we would rather leave a gap than publish a number we cannot stand behind. We are asking for it.
The cabin itself
The Cabin Three, photographed as it is
Works photographs of the actual cabin, plus visualised garden settings where marked. Shown with a dark exterior finish — the cabin arrives unpainted and you choose the colour.
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In a gardenAutumn light, fire pit alongside · visualised -
The cabinGlass door open, bronze glazing. -
On a pathSet on paving with planting around it · visualised -
Three-quarterOne bench tier, 175 cm of sauna room. -
Steel strapsThe straps that hold the walls and get re-tightened. -
EveningLit from inside through the glass door · visualised -
Harvia PC70The heater and its stones are in the price. -
InteriorAlder benches, left untreated. -
BenchThe 175 cm bench and backrest. -
RoofBitumen shingle over the curved roof. -
Side185 cm deep, 220 cm across. -
How it arrivesOne protective crate on a pallet, 690 kg. -
Ready to travelStrapped before it leaves the works. -
PlainThe cabin against a clean background.
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Finish
It arrives untreated. The colour is yours to choose.
The cabin ships as bare spruce, so the first job after assembly is treating the outside. Use whatever exterior wood preservative or stain you prefer — there is no proprietary product to buy from us, and no shade you are locked into. Treat it before first use, then keep to whatever interval that product specifies.
Illustrations of finishes the timber can take. They are not photographs of delivered cabins, and the shade you get depends on the product you choose and how many coats you apply.
Specification
Every number we can stand behind, and none we cannot.
The cabin
| External size | 185 × 220 cm |
| External height | Not published — the factory drawings do not carry it, and we are asking for it |
| Steam room depth | 175 cm |
| Internal clear width | 206 cm |
| Wall | 44 mm solid spruce, kiln-dried to ≤14 % moisture |
| Benches and backrests | Alder |
| Bench tiers | One |
| Door | 8 mm toughened glass, 177 × 69 cm, with lock |
| Model code | The Cabin Three the factory reference, used on your order and packing list |
| Capacity | 3 people Seated on the 175 cm bench |
| Exterior finish | Arrives unpainted Treat and colour it yourself, any product you like |
| Roof and frame | Bitumen shingle, steel tension straps |
Heater and power
| Heater | Harvia Cilindro PC70, 6.8 kW — included in the price |
| Heater rating | Sauna rooms of 6–10 m³, Harvia’s own rating |
| Stones | Holds up to 80 kg; 20 kg supplied |
| Controls | Built-in timer and thermostat, no separate unit |
| Electrical supply | Dedicated 230 V, 35 A, 6 mm² H07RN-F, Part P |
Weight and delivery
| Weight | 690 kg |
| Shipping crate | 240 × 120 × 100 cm, three pallet spaces, non-stackable |
| Assembly | 8–12 hours, two people Basic tools: TORX T25, PZ2, 8 mm spanner, drill |
| Warranty | 2 years |
Maintenance
The straps are meant to be re-tightened
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01After about a month
The timber settlesSolid spruce moves as it dries and settles into place. The first take-up is the one that matters — go round every strap with a spanner once the cabin has been standing for a few weeks.
Once, ~1 month in
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02Every year after that
A two-minute jobAfter the first take-up the movement is seasonal rather than structural. One round a year keeps the walls tight. It takes a spanner and a couple of minutes per strap.
Once a year
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03Why it matters
Nobody else publishes thisNo sauna seller in the UK puts a re-tightening schedule on the page, which is why owners tend to find out from a creaking wall instead of a manual. It is not a fault — it is how a strapped timber cabin works.
Not a defect
Questions people ask
What does it stand on?
A firm, level base. A concrete slab, paving or compacted gravel all work. The cabin arrives with its own timber floor and base frame, so nothing needs building underneath it.
What electrical work will I need?
A dedicated 35 A circuit run to the cabin in 6 mm² H07RN-F rubber cable, designed, installed, tested and certified by a competent electrician to BS 7671. PVC cable is not permitted. That work is not included in the price, and it is worth getting a quote before you order.
Do I need planning permission?
Planning permission and Building Regulations are separate things, and neither answer is automatic. What applies can depend on the height of the building, where you put it, how close it sits to a boundary, and the property itself. Check the Planning Portal and your local authority before you install it.
Can I use it in winter?
Yes. It is an outdoor cabin and the heater is sized for the room.
How do I look after the outside?
The cabin ships as bare spruce, which means the colour is your decision rather than ours. Use any exterior wood preservative or stain you like, in any shade, and put it on before first use. After that, keep to whatever interval that product specifies.
What if something arrives damaged or missing?
Tell us and we send the part. We hold spares rather than replacing whole cabins.
How long does assembly take?
Eight to twelve hours with two people. It is a flat-pack cabin, not a kit of loose boards — the panels are pre-cut and pre-drilled. You need a TORX T25 and PZ2 bit, an 8 mm spanner and a drill. The manual travels in the crate.
What does the warranty cover?
Two years on the cabin structure against manufacturing defects. That sits on top of your statutory rights under the Consumer Rights Act, which are not affected by anything we say here. If a part arrives damaged or missing, we send the part rather than replacing the whole cabin.
Can I return it?
Yes. You have 14 days from delivery to change your mind, under the Consumer Contracts Regulations. This is a made-to-order cabin, but that does not remove the right. Because it travels as a 690 kg crate, a return needs a booked collection — talk to us first and we will arrange it and confirm the cost before anything moves.