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The Cabin Six Two-Tier Electric Outdoor Sauna, Harvia Heater Included
Harvia PC70 heater included
External size 340 × 220 cmThree spaces under one roof, at a glance
That is 7.5 m² on the ground. A firm, level base the size of the footprint: slab, paving or compacted gravel.
01Your heater
The PC70 is in the price. Harvia rates it for rooms of 6 to 10 m³ and the PC90 for 8 to 14 m³. The PC90 needs a 40 A supply instead of 35 A. The dedicated supply and final connection by a competent electrician are not included.
Two glass doors in the price. Outer and partition, 8 mm toughened glass, both opening outward.
02Choose your extras optional
Fitted during assemblyLED lighting kit, IP65Two lamps inside, one outside. Rated for damp conditions.
HarviaSauna stonesNot in the cabin price. The PC70 basket takes up to 80 kg.
03Add accessories optional
HarviaHarvia sauna set: pail, ladle, gauge and timerPail, ladle, gauge and timer in one go.
HarviaHarvia sauna pail and ladle, timberTimber pail and ladle, the two you actually reach for.
HarviaHarvia Black Steel sauna setMatt black stainless.
HarviaHarvia sauna thermo-hygrometer, alderTemperature and humidity on one alder plate.
4Living4Living sauna thermo-hygrometer, heat-treated alderThe same two readings, darker frame.
HarviaHarvia sauna sand timer, 15 minutesFifteen minutes, no battery to die in the heat.
Timber sauna thermometerThe simplest way to know where the room is.
HarviaHarvia Bluetooth sauna speaker, blackIPX6, rated to 65 °C. Keep it low, not by the ceiling.
RentoRento birch sauna whiskBirch leaves, bound by hand. Soak before the first use.
RentoRento sauna fragrance gift box, three by 400 mlThree fragrances for the water in the ladle.
Eucalyptus sauna fragrance, 500 mlEucalyptus, a few drops in the ladle.
Your build
14 days to change your mind, unused and in the crate. The return pallet is at your cost.
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.
- Harvia’s own manual gives the clearances round the heater.
- The supply and the connection are not in the price of the sauna.
1Site and planning
Will it work where you live?
Four checks, all before you pay. For the electric edition the one that decides it is the circuit from your house.
The heater’s own circuit, from the consumer unit to the cabin. Its own circuitThe Harvia heater needs its own circuit from your consumer unit: 35 A single-phase for the PC70, 40 A for the PC90 option. Your electrician decides whether your supply can take it.
A Harvia Cilindro pillar heater, the type fitted in the hot room. The heater in the priceA Harvia Cilindro PC70, 6.8 kW, with its timer and thermostat built in. Harvia rates it for rooms of 6 to 10 m³. The 9 kW PC90 is an option.
The footprint to scale on a garden plot, with the 2 m band along the boundary. Space and planningIt covers 3.4 × 2.2 m (7.5 m²) and stands about 2.2 m tall, under the 2.5 m limit for building within 2 m of a boundary. In most gardens in England and Wales it counts as permitted development, so you won’t need planning permission. Conservation areas, listed buildings, flats, Scotland and Northern Ireland have their own rules: check yours on the Planning Portal.
From the kerb to your base: the crate is set down on hard standing and the parts carried through. Getting it into the gardenOne crate, 3.4 × 1.2 × 1 m, set down at the kerb. If it cannot go further, it is opened there and the parts carried through, so walk the route from the road to the spot: gate, corners, steps.
- Heater: Harvia Cilindro PC70, 6.8 kW
- Supply: 230 V single-phase, 1 × 35 A, or 400 V three-phase, 3 × 10 A
- If you choose the PC90 option, 9 kW: 40 A single-phase, or 3 × 16 A three-phase
- Cable: rubber-insulated, H07RN-F or equivalent, as the Harvia manual specifies. PVC is not permitted
- Design, installation, testing and certification to BS 7671; notifiable under Part P in England and Wales
- Clearances: as the Harvia manual in the heater box sets out
- Not in our price. Get the quote before you order the sauna
- What is the main fuse, and what else shares it?An electric shower or an EV charger on the same supply changes the design.
- How far is the cabin from the consumer unit?Cable size follows distance.
- Where does the cable run?A buried armoured cable needs a trench; the route is part of the quote.
- What will it cost?Ask for the figure in writing, then order the sauna.
No electrics at all where the cabin goes? The wood-fired edition needs no heater circuit.
Not sure about the spot? Send a photo and your postcode on WhatsApp and we will look at it with you.
2Layout and seats
Will six fit, and will it be comfortable?
Six seated on two heights, with a changing room between the heat and the garden.
- 340 × 220 cmoutside
- 206 × 185 cmhot room
- 211 cmupper bench, long enough to lie on
- 2 doorsglass, both open outward
The upper bench and backrest, the lower tier in front. The light strips under the benches were fitted for the pictures and are not in the crate. 
The side bench runs from the tiers to the partition. 
A round vent disc on the back wall, high up. 
The hot room through the partition door. Hot room · 206 × 185 cm
Two tiers, so nobody sits in cold airThe upper bench runs 211 cm along the back wall with a backrest; the lower tier, 36 cm deep, sits in front of it as a step and a cooler seat. A side bench, 95 × 50 cm, runs to the partition. Sit high for the heat, rest your feet on the lower tier, move down when it is enough.
One of the two storage benches in the changing room. 
Through both glass doors into the hot room. 
Turned timber knobs either side of the glass. 
A roller catch holds each door shut. Changing room · 85 cm deep
Somewhere dry to leave your thingsTwo storage benches, 85 × 49 cm, one on each side, with lids on hinges for towels and robes. A glass door on each side of it: the heat stays in the hot room and the garden air stays out.
The porch: a seat either side of the outer door. 
The porch end, photographed at the works. Porch · 43 cm
A seat outside to cool offTwo seats, 56 × 40 cm, one either side of the outer door, under the roof.
Six is seated, not lying down: three along the upper bench, the rest on the side bench and the lower tier. One person can lie full length on the upper bench.
3What is included
What else will I have to buy?
The price covers the cabin and the Harvia heater. Everything else is listed here, so the total holds no surprises.
In the crate, in the price
- The cabinBase runners, the floor, wall and roof boards, three frames, the partition and two glass doors with knobs and roller catches.
- InsideUpper bench and backrest, lower tier, side bench, two storage benches, two porch seats, three slatted floor sections, a floor drain plate and two vent sets.
- The roof100 bitumen shingles, the starter battens and the roofing nails.
- Four steel strapsWith their clips and tensioners, to hold the shell tight as the timber moves.
- The heaterA Harvia Cilindro PC70, 6.8 kW, with its timer and thermostat built in. The 9 kW PC90 is an option in the configurator.
- Every fixingListed by code in the manual, each step showing which ones it takes. If anything is short, we send it.
Not in the crate: plan for these
- A firm, level baseSlab, paving or compacted gravel, the size of the footprint. The cabin stands on four runners. How
- The electricianThe heater’s own circuit from your consumer unit, the cable run and the connection, by a qualified electrician. What to ask
- Sauna stonesThe heater basket takes up to 80 kg, stones 5 to 10 cm. Add them in the configurator, 20 kg a box. Choose them
- Exterior wood treatmentAnd a brush. Outside walls only; the inside stays bare timber. How
- Bitumen sealantAnd a gun, for the ridge and the roof edges.
- Expanding foamFor the gap along the ridge inside and round the door frames.
- ToolsDrill-driver with T25 and PZ2 bits, a drill with an 8 mm bit, a jigsaw, rubber mallet, hammer, knife, two spanners, a level and a tape.
The electrician’s work is the one cost we cannot quote: ask for the figure in writing before you order the sauna.
4Delivery
How does it get to my garden, and when?
Made to order, then one crate on a lorry with its own fork-lift, typically 2 to 4 weeks from order to your kerb.
- 3.4 × 1.2 × 1 mone timber crate, strapped on a pallet
- About 1,160 kgthe cabin, before the heater and stones; confirmed on the dispatch note
- 4 pallet spacestoo long for a tail-lift, so it comes on a lorry with its own fork-lift
- 2 to 4 weeksorder to kerb, UK mainland, typically
1Made for youThe factory builds your cabin to order, about ten days, then it goes into transit.
2The day is bookedOur carrier calls to agree the day. If the date changes, we let you know.
3At the kerbThe crate is set down on the nearest safe hard standing, driveway or road, not grass. The driver does not carry it into the garden.
4Check before you signPhotograph any damage before you sign, then count the parts against the packing list. Tell us within 14 days and we replace the part free, delivery included.
The crate stops at the kerb. Opened there, it comes out as boards, three frames, two doors in their frames, benches, the roof parts and the heater in its box. Plan for two people and a sack truck, and walk the route first: a side gate, a corner, a step.
The longest parts are the wall and roof boards; the end frames are nearly as wide as the cabin.
Delivery to most of the UK mainland is in the price; a few areas, the Scottish Highlands among them, carry a surcharge shown before checkout. Put your postcode in to see yours.
Delivery
Delivery by postcode
Kerbside delivery to most of the UK mainland is in the price. A few places carry a surcharge because the pallet network charges us for them. Check your postcode: the figure shown is the one checkout uses.
All delivery zones
- UK mainlandIn the price
- Isle of Wight£49
- Scottish Highlands£79
- Northern Ireland£99
- Scottish Islands and Isle of Man£149
- Channel Islands, Isles of Scilly, BFPONot served
5Assembly
Can we build it ourselves?
Yes: two people, ordinary tools and a manual that draws every step. Read all of it before you order.
32 pages: every part listed by code, every step drawn. On-site assembly is not included: you, or someone you hire, build it from this.
- 2people
- 10stages
- 100shingles
- 4steel straps
Ten stages, two people, every step in the manual. Download the assembly guide (PDF).
The heater needs its own circuit from the consumer unit, installed and certified by a qualified electrician (notifiable work under Part P in England and Wales).
The cabin stands on four runners, 195 cm long, laid across its width. Make the base the size of the footprint, 340 × 220 cm, no larger: a slab that sticks out past the walls holds rain against them. The floor drain empties under the cabin: on gravel it soaks away; on a slab or paving, leave a gravel-filled gap under the drain so the water can get away.
- Concrete slabThe firmest base, and it stays level longest.
- Paving slabsOn a compacted bed, laid level to the size of the footprint.
- Compacted gravelWell compacted and levelled, with free drainage beneath.
- Level and tape
- Drill-driver, T25 and PZ2 bits
- Drill with an 8 mm bit
- Jigsaw
- Rubber mallet
- Hammer and knife
- Two spanners
- A sealant gun
6Warranty and returns
Who am I paying, and what if something goes wrong?
Waldenhaus Limited, a UK company. Each of these has a written answer before you pay.
It arrives damaged or short
Photograph it before you sign and tell us within 14 days. We send the replacement part free, delivery included.
A part fails
2-year warranty against manufacturing and material defects, from the day of delivery, on the cabin and everything supplied in the crate. The part is free; its delivery is yours. The heater also has Harvia’s own warranty: 2 years for home use, plus 1 year if you register it within 30 days.
You need a part later
Need a replacement board or catch? Tell us what’s missing and we’ll source the part for you.
You change your mind
14 days from delivery, unused and still in the crate. The return pallet is at your cost, typically £150 to £250.
Waldenhaus Limited, 71-75 Shelton Street, London WC2H 9JQ. Company No. 16877766, VAT GB519957245. Payment goes through Shopify’s secure checkout; we never see your card.
7Care and upkeep
Will it leak, rot or go mouldy?
Not if the outside is treated, the roof stays sealed and the room is dried after each session.
The outside walls, shown with a finish applied for the pictures. Treat the outsideIt arrives untreated. Before its first winter, treat the outside walls with an exterior wood finish of your choice, from the base up to 1.6 m as the manual shows. The inside stays bare.
- Keep the roof sealed
The shingles are nailed in overlapping rows; bitumen sealant closes the ridge and the roof edges. Look them over each spring: that is where rain would find a way in.
Two vents in the back wall, one high and one low. Dry it after every sessionLeave both doors ajar and the two vents open until the room is dry. The drain empties under the cabin, so keep the ground beneath it free-draining.
A strap tensioner on the side wall. Check the strapsTimber moves with the seasons. Check the four straps after the first month and then each spring, and tighten them with two spanners.
- The heater and its stones
Look after the heater as Harvia’s manual sets out. Stack the stones loosely so air moves between them, and replace any that crumble.
- Rarely used, or over winter
Air it on a dry day every few weeks with the vents open, and clear snow and leaves off the roof.
Questions people ask
Is six people realistic?
Yes, seated. Three along the upper bench, which runs 211 cm across the back wall, and the rest on the side bench and the lower tier. The lower tier also works as a step and a footrest, so the people above are not sitting with their feet in cooler air. One person can lie full length on the upper bench.
Will my house supply take it?
The Harvia PC70 runs on single-phase, which suits many UK homes. It needs its own circuit from the consumer unit, 35 A for the PC70 and 40 A for the PC90 option, and your electrician decides the rest: the main fuse, what else shares it, the distance and the cable route. The list to show them is in Your address.
PC70 or PC90?
The PC70, 6.8 kW, comes in the price; Harvia rates it for rooms of 6 to 10 m³. The PC90, 9 kW, is an option: Harvia rates it for 8 to 14 m³, and it needs a 40 A circuit, or 3 × 16 A three-phase, instead of 35 A. Ask your electrician before you choose it.
Does it use a lot of electricity?
Only while the heater is on: 6.8 kW at full power for the PC70, nothing on standby. What an evening costs depends on your tariff and how long you keep the room hot.
Do I need planning permission?
Garden buildings are usually permitted development in England and Wales; this cabin covers 7.5 m². Height near a boundary, conservation areas, listed settings, flats, Scotland and Northern Ireland all change the answer. Check the Planning Portal and your council before you order.
Will rain get in?
Rain runs off a roof of nailed bitumen shingles, sealed along the ridge and the edges with bitumen sealant as the manual shows. Look the sealant over each spring and keep the outside walls treated: those are the places water would find a way.
Should I tell my home insurer?
Yes. A garden building of this value often sits above the outbuildings limit on a standard policy, and insurers expect to be told about a heated garden building. One call before delivery.
Where in the garden should it go?
Close to the house: you walk back from it in a towel, and a shorter cable run costs less. Face the glass doors to the fence or the house, not the street. Leave room to walk round it and to reach the straps.
Can I use it through a British winter?
Yes. It is an outdoor cabin. The jobs that matter first are the exterior treatment before its first winter and the strap check after the first month.
What exactly is it made of?
Solid timber boards for the floor, walls and roof, timber benches, and two glass doors in timber frames. No glued sandwich panels and no PIR boards anywhere in the build. It ships untreated: the exterior finish is yours to choose.
Electric or wood-fired?
Same cabin. Electric heats on a timer and needs its own circuit: 35 A for the PC70, 40 A for the PC90. Wood-fired needs no heater circuit, but has a flue through the roof, is fed from outside the cabin and, in a smoke control area, needs a check with your council. If your electrician’s quote is the sticking point, look at the wood-fired edition.
Can I take it with me if I move house?
It is designed to be built once. The factory does not provide for taking it down and rebuilding it, so plan the site as permanent.
Will we actually use it?
The honest risk with any sauna is the habit, not the build. Size for the people who will use it every week: six seats suit a family or friends who come round, and a couple will find it roomy. If you have never kept a sauna habit, try a month at a local gym first.
Is a sauna safe for everyone?
We sell the cabin and do not give medical advice. If anyone in the household is pregnant or has a heart or blood-pressure condition, ask a GP before using any sauna. Keep children away from the heater.
Who am I buying from?
Waldenhaus Limited, 71-75 Shelton Street, London WC2H 9JQ, Company No. 16877766. We sell garden structures for British weather: greenhouses first, and now saunas we select, document and support.
What are my legal rights?
The Consumer Rights Act 2015 applies: goods must be as described, of satisfactory quality and fit for purpose. Distance orders carry a 14-day cancellation right under the Consumer Contracts Regulations 2013. These come from the law, whoever you buy from.
The Cabin Six Two-Tier · electric
Six seats, two rooms, one crate.
£6,495 with the Harvia heater. Kerbside delivery on the UK mainland, typically 2 to 4 weeks.