Dry sauna builder in Bali: custom cedar cabins for villas

Building a cabin that survives Bali's humidity

A dry sauna in Bali is fighting the climate on every day it is switched off, not just when it is running. At 80–90 % relative humidity, moisture works its way through untreated timber and settles into the insulation, and a cabin built the way it would be in Europe will mould behind the cladding within 2–3 years. That is why every wall here goes together as a sandwich: exterior panel, 50 mm rockwool, an aluminium-foil vapour barrier taped at every joint, a 20 mm ventilation gap, then the interior cladding. The foil keeps steam away from the insulation; the gap lets the cladding dry out from behind it.

Inside, we use western red cedar, Scandinavian spruce or thermowood, with benches in aspen or abachi because both stay cool enough to sit on at 90 °C. Local hardwoods like ulin and bengkirai are genuinely good choices outdoors, on decking and thresholds, but they do not belong inside a hot room. Ventilation always comes as a pair — a supply vent low near the heater, an exhaust set high on the opposite wall — so the cabin breathes while it is running and dries out once it is not. Along the coast, from Berawa through Pererenan and down to Bingin, every screw, hinge and heater guard is stainless, because salt air will corrode zinc-plated hardware inside a single season.

Sizing the cabin and the power it will draw

The request we hear most is a four-person cabin around 2×2 m with a 6 kW heater. Drop to a two-person cabin at 1.5×1.2 m and the heater comes down to 3.6 kW; go up to six people at 2.4×2 m and it climbs to 8 kW; eight people in a 3×2.4 m room needs 9 kW. Past that, 10.5–12 kW heaters for retreat or studio saunas run on three-phase power. Every cabin leaves with an 8 mm tempered-glass door, a heater guard and a bucket-and-ladle set as standard, and handover only happens once we have test-heated it with you standing in the room.

Electricity gets checked before wood choice or size, not after. A 3.6 kW heater runs happily on a 5,500 VA supply; a 6–9 kW heater wants 7,700–11,000 VA, which in older parts of Umalas, Seminyak or Sanur usually means a PLN upgrade up from 2,200–5,500 VA — the owner applies for and pays that upgrade, and we put the exact capacity needed on the quote itself. The heater always gets its own circuit in heat-resistant SiHF cable, a dedicated breaker and an ELCB. When an upgrade genuinely is not possible, an infrared sauna at 1.7–2.4 kW is the honest fallback.

Getting it installed, wherever the villa sits

While your site is being prepared, the cabin itself is taking shape in our workshop near Canggu, then arrives as panels. Indoor builds in Berawa, Umalas and Sanur typically fill a spare room, a pool house or a converted garage, and run 2–4 weeks on site including the electrics. Outdoor cabins on rice-field plots in Pererenan or jungle terraces in Ubud get a raised base, an overhanging roof and a small porch for towels — covered in more detail on the custom and outdoor sauna page. Stair-only access around Bingin and Uluwatu is not a problem, since nothing we deliver is heavier than two people can carry between them.

Heaters come from Harvia, Sawo or Tylö, carry 1–2 years of factory warranty, and spare parts are held on the island rather than ordered from overseas; the cabin structure itself carries our own 2-year warranty separately. A villa sauna used four or five evenings a week typically costs IDR 200,000–500,000 a month to run at standard PLN rates. Nusa Lembongan and the Gili islands are reached by cargo boat, freight quoted on request. For the full breakdown of what moves the price up or down, see the sauna price list for Bali.

What it costs, configuration by configuration

Ballpark figures in IDR that leave out any PLN upgrade or civil works — IDR 60–120 million comes to roughly USD 3,600–7,300 at IDR 16,500 per USD.