DownloadsFree, to plan and build
The Cabin Four Electric Outdoor Sauna, Harvia Heater Included
Harvia PC70 heater included
External size 240 × 220 cmFootprint and door, at a glance
That is 5.3 m² on the ground. A firm, level base is all it needs: slab, paving or compacted gravel.
01Your heater
The PC70 is in the price. Harvia rates it for rooms of 6 to 10 m³ and it runs on a 35 A single-phase supply. 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
Fitted at the factoryBlack EditionGraphite roof and black-framed door. Replaces both.
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.
04Add 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, for the Black Edition.
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
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 asks for 100 mm of clearance around the heater and 950 mm above it; the factory fits the heater to this cabin.
- The supply and the connection are not in the price of the sauna.
Waldenhaus saunas
Open the crate before you buy it.
1 of 4 · Your build
Your build, clearly listed
What comes in the crate, and what you arrange yourself.
- Seats
- 4two a side
- Hot room
- 206 × 175 cmwall to wall
- Heater
- 6.8 kWHarvia PC70, in the price
- On the ground
- 5.3 m²240 × 220 cm
- Crate
- 1340 × 120 × 100 cm
- Outside
- 240 × 220 cm
- Hot room
- 206 × 175 cm
- Benches
- 174 × 55 cm, one tier
- Door
- 1770 × 690 mm
In the crate
Comes with every Cabin Four. Tap a card for photos.
- The whole cabinOne crate, every part numbered · 8 photos
Front view, photographed at the works Porch seats either side of the door Three-quarter view, shingle roof and straps The back wall and the shingle roof Two benches, one aisle Harvia Cilindro PC70 beside the alder bench Porch seat and the toughened glass door Bench, step and backrest before any finish
Not in the crate
Six things you arrange yourself.
2 of 4 · Base & site
Your base and the electrics
Plan the pad, the route in and the supply before the crate arrives.
Mark out the base
The footprint and the door end.
- Mark 240 × 220 cmWith the door end facing where you want to walk in.
- Check the diagonalsBoth the same length, so the pad is square.
- Level the padNo larger than the footprint, with free drainage.
The cabin brings its own floor and base frame: three joists sit on the pad.
Six rules before you build
Read these before the pad goes down.
- 1Pad the size of the footprint
A slab that sticks out past the wall holds rain against it. 240 × 220 cm, no larger.
- 2Level and square
The three base joists go down level; measure both diagonals and make them equal before the walls go up.
- 3Free drainage
A little fall, or free drainage beneath the base, so the floor never sits wet.
- 4A route in for 2.35 m parts
The crate stops at the kerb. Walk the route to the plot first: side gate, corners, steps.
- 5Close to the house
You walk back from it in a towel. Face the glass door to the fence or the house, not the street.
- 6Check planning
Garden buildings are usually permitted development in England and Wales; height, boundary distance, conservation areas and listed settings change the answer. Planning Portal.
Bases you can build
Whichever you choose, keep it level, the size of the footprint, and draining freely.
- Concrete slab
The firmest base, and it stays level longest.
- Paving slabs
On a compacted bed, laid level to the size of the footprint.
- Compacted gravel
Well compacted and levelled, with free drainage beneath.
Will it run off my house?
Most UK homes can: the heater runs on single-phase. It needs its own circuit, and your electrician decides the rest.
- Show this to your electrician
- Heater: Harvia Cilindro PC70, 6.8 kW
- Supply: 230 V single-phase, 1 × 35 A, or 400 V three-phase, 3 × 10 A
- 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
- Sensor placed as the Harvia manual shows
- Not in our price. Get the quote before you order the sauna
- Four questions to settle before you order
- 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.
The deciding question for electric. The wood-fired build needs no heater circuit, but has a check of its own: Smoke Control Areas.
3 of 4 · Assembly
Assembly, before you start
Two people, the assembly manual and ordinary tools. We do not offer assembly, for any cabin: a local joiner can quote from the manual.
- People
- 2one holds, one fixes
- Time
- 1 weekendnot an afternoon
- Shingles
- 83nailed on
- Fixings
- ≈1,150counted into the crate
- Manual
- 38 pagespublic before you order
From the assembly manual
Tap a step for the drawing.
Watch it, read it
The manual is public: read it before you order.
4 of 4 · Parts & warranty
If something is missing, damaged or breaks
Three things that can go wrong, and what happens next.
What happens next
Spare parts, not a new cabin.
- 1Missing or damaged on arrival
Count the parts against the packing list and photograph anything damaged before you sign. Email support@waldenhaus.uk or WhatsApp a photo and your order number, and we send the replacement part.
- 2A part fails later
Tell us with a photo. We answer within seven working days, and we replace parts, not whole cabins.
- 3The written warranty
From delivery, on the cabin and everything supplied in the crate: full terms, published before you order. The Harvia heater also carries Harvia's own manufacturer warranty: 2 years for home use, plus 1 year on registration with Harvia within 30 days. Harvia requires the connection to be made by a qualified electrician.
Looking after it
Five things, none of them hard.
Your money, before the crate ships
- Weeks, not months
The factory builds your cabin in about ten days; order to kerb is typically two to four weeks.
- A photo before dispatch
We ask the works for a photograph of your packed crate with its packing list before it leaves, and pass it on to you.
- A company you can find
Waldenhaus Limited, 71-75 Shelton Street, London WC2H 9JQ.
Your statutory rights are not affected.
The cabin itself
The Cabin Four, photographed as it is
Works photographs of the actual cabin, plus visualised garden settings where marked. Shown with an exterior finish applied for the photographs. The cabin arrives unpainted and you choose the colour.
-
The cabinFront view, photographed at the works before dispatch. -
DetailsPorch seat and the step, in a honey finish. -
The cabinPorch seats either side of the door. -
The cabinThree-quarter view, shingle roof and steel straps. -
The cabinThe back wall and the shingle roof. -
InsideTwo benches, one aisle, lit for the evening. -
InsideHarvia Cilindro PC70 beside the alder bench. -
InsideBench, step and backrest before any finish. -
DetailsPorch seat and the 8 mm toughened glass door. -
DetailsTurned timber knob on the glass door. -
DetailsDoor hinge and roller catch. -
DetailsSteel tension strap and tensioner. -
DetailsVentilation opening through the timber lining. -
DetailsStainless drain plate in the floor. -
DrawingFactory plan: 240 × 220 cm, hot room 206 × 175 cm.
1 / 15
Compare
Electric or wood-fired
Same cabin, two ways to heat it. The deciding questions are your electrics and your address.
| Electric · this page | Wood-fired | |
|---|---|---|
| Heat | Harvia Cilindro PC70, 6.8 kW, in the price | Wood-burning stove with its flue kit, in the price |
| You arrange | Its own 35 A circuit, wired by a qualified electrician | A Part J sign-off for the stove and flue, a plate under the stove, flue sealant |
| Before you order | Get the electrician's quote | Check your Smoke Control Area |
| Each session | Set the timer and come back | Light it, feed it and tend it |
| Upkeep | The cabin only | The cabin, and a chimney sweep at least once a year |
| The cabin | Identical: 240 × 220 cm, four seats, the same crate | Identical: 240 × 220 cm, four seats, the same crate |
| Price | £4,795 | £4,999 |
Sizes & prices
Pick the size, then the heat
The timber, the glass door and the roof are the same across the range. The size sets the length, the benches and the crate.
3The Cabin Three- 185 × 220 cm on the ground
- Hot room 206 × 155 cm, L-shaped benches
- Seats three
- Crate 240 × 120 × 100 cm
Electric £3,995Wood-fired £4,199
Choose this size →
This page4The Cabin Four- 240 × 220 cm on the ground
- Hot room 206 × 175 cm, benches on both side walls
- Seats four
- Crate 340 × 120 × 100 cm
Electric £4,795Wood-fired £4,999
One crate to your kerb. Then the last twenty metres are yours.
Made to order and sent as a single protective crate on a pallet lorry. Read this part before you order, because the route from the road to the plot is the one thing we cannot check for you.
- 340 × 120 × 100 cmone timber crate, strapped on a pallet
- 770 kgthe cabin, before the heater and stones
- 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
The lorry
It comes on a lorry with a Moffett fork-lift and is set down at the nearest safe hard-standing: driveway or road, not grass or soft ground. The driver does not carry it into the garden. Our carrier calls to book the day.
After the kerb
The crate opens into wall boards, a door in its frame, benches, roof parts and the heater. Plan for two people and a sack truck. The longest parts are 2.35 m, so walk the route to the plot first: a side gate, a corner, a step.
When it arrives
Count the parts against the packing list and photograph anything damaged before you sign. Tell us as soon as you can, and we send the replacement part. Spare parts, not a new cabin: that is how a missing board is solved.
Delivery charge
UK mainland delivery is in the price; a few areas 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
Questions people ask
Is four people realistic?
Yes, seated. Two on each bench, facing each other, with the heater on the back wall between you. Each bench is 174 cm long and 55 cm deep, so the same room seats four or lets two lie down. It is a four-person cabin, not a six-person one with the number rounded up.
Do I need planning permission?
Garden buildings are usually permitted development in England and Wales; this cabin covers 5.3 m². Height, distance to 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.
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. Face the glass door to the fence or the house, not the street; the matt-glass door option keeps the room private with the light on. 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 and the heater is rated for the room. The two jobs that matter first are the exterior treatment before the first season and the strap check after the first month.
Does it use a lot of electricity?
Only while the heater is on: 6.8 kW at full power, nothing on standby. What an evening costs depends on your tariff and how long you keep the room hot.
What exactly is it made of?
Solid timber boards for the walls, alder for the benches and backrests, an 8 mm toughened glass door. No glued sandwich panels and no PIR boards anywhere in the build. It ships untreated: the exterior finish is yours to choose.
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.
Electric or wood-fired?
Same cabin. Electric heats on a timer and needs its own 35 A circuit. Wood-fired needs no heater circuit but does need a flue through the roof and, in a Smoke Control Area, a check with your council. If your electrician's quote is the sticking point, look at the wood-fired build.
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: a four-person room is for a household that sits together, or two people who like to lie down. 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.
Who am I buying from?
Waldenhaus Limited, 71-75 Shelton Street, London WC2H 9JQ. We sell garden structures for British weather: greenhouses first, and now saunas made to our specification.
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.
Build your Cabin Four.
Pick the heater, the door and the extras; the price follows your choices. Delivery surcharges, where they apply, show by postcode before checkout.
Heater in the price · Written warranty · Kerbside delivery to the UK mainland, typically 2 to 4 weeks