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Rendering of the Kivi 4, the four-person single-wall sauna.
Architectural rendering, not a photograph of a completed build.

Kivi 4

The Kivi 2, stretched to seat four.

4 people · Fully built from $11,200

Before electrical, permit, delivery and site prep.

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Rendering of the Kivi 4 from above with the roof off, showing the benches and heater.
Architectural rendering, not a photograph of a completed build.

Inside.

  • Seats 4 people, on a full-width cedar bench.
  • 42 inches above the upper bench, so you can sit up straight in the best of the heat.
  • Softer, longer-lasting steam from a 9 kW stone-tower heater.

The essentials

Seats
4 people
Footprint
8'-5" × 5'-7"
Height
9'-2"
Heater
Harvia Cilindro PC90, 9 kW
Walls
Natural single-wall
Heat-up, est.
45–70 min in summer, about 2–3 h in winter

What's included

  • A full drawing set for your build: plans, elevations, sections and details
  • Heater, stones, controls and a wooden heater guard
  • A first-fire walkthrough: how to heat it, vent it and dry it

The 240 V circuit is run by a licensed electrician. We can arrange it or work with yours.

Full specifications

The Kivi 4 is the Kivi 2 made wider, and nothing else about the idea changes: one thick wall of oiled boards, black posts and battens, a cedar door and a single window. Inside, an upper bench at 48 inches leaves 42 inches of headroom and seats four, with the foot bench at 32 inches and a low step by the door. A stone-tower heater stands in the front corner, behind the solid panel.

Kivi 4 specifications
Interior7'-10" W × 5'-0" D × 7'-6" H
Volume294 ft³
Footprint8'-5" × 5'-7"
Height9'-2" grade to roof
HeaterHarvia Cilindro PC90 · 9 kW
Seats4 bathers
Headroom42" above the upper bench
Heater stonesHeavier stones, softer and longer-lasting steam200 lb of stones
Heat-up to 175°FSummer, 90°F outside45–70 min (est.)
Heat-up to 175°FWinter, 35°F outsideabout 2–3 h (est.)
Bathing temperatureThermostat on the heater160–190°F, 160–180°F below freezing
PriceBefore electrical, permit, delivery and site prep.Fully built from $11,200

The Kivi 4 pairs a heavy stone load with an uninsulated wall, so it is the slowest of the four to come up to heat, most of all in winter. Start it two to three hours ahead on a cold evening, and expect 160 to 180°F below freezing.

Heat-up times are our estimates from the heater makers' sizing guides and the wall build, not yet measured on a finished sauna.

Materials

Front
Cedar frame-and-panel door, 24¼ × 77¾, outswing, with a tempered glass strip and a 5¾" black pull, a fixed ¼" tempered window, 23¼ × 35¼, in black trim with the sill at 44", and a 43" board panel with one black batten
Walls
Horizontal 2×6 select whitewood tongue-and-groove, one board thick, no insulation
Exterior
Natural low-VOC oil on the outer face of the wall boards, with black 4×4 corner posts and 2×4 battens that line up around the building
Interior
The raw inner face of the same boards
Ceiling
1×6 spruce tongue-and-groove at 7'-6", under tapered joists
Heater guard
Softwood safety fence around the Cilindro, fixed to the wall and kept below the top of the stones
Roof
Black 26-gauge PBR panel with drip edge, 12" front overhang, ¾" per foot fall to the rear
Benches
Western red cedar with rounded top edges. Upper 48", 20" deep, with a three-slat backrest, foot bench 32", both full width, and a 12" step at 16"
Floor and base
Lift-out cedar floor mats on pressure-treated ply, a tiled pad under the heater, on five 4×4 pressure-treated skids, with a recessed black rim for a shadow line at the base. No slab required
Ventilation
4" low intake on the right wall, 6" low exhaust at the back, 4" drying vent with a damper at 7'-0"

Options

  • Heater: available in Harvia Cilindro PC90 9 kW. Other heaters on request.
  • Bench lighting: available in LED strips under the benches. Add-on, on a separate 120 V circuit.
  • Lighting, sound, a deck and a shower can be planned with your sauna. Just ask.

More questions

How is it different from the Valo 4?
The room inside is the same size. The Kivi 4 has one thick wall of oiled boards and a cedar door with a window. The Valo 4 has an insulated, black-stained wall and a glass door and sidelight.
Why single-wall?
It is the simplest and least expensive way to build a four-person room. Thick boards suit our climate, and there is nothing hidden inside to trap moisture. If you plan to use it mostly on cold evenings, the Valo 4 heats faster.

The drawings

Every Kivi 4 comes with its own drawing set, the same sheets the build crew works from.

Front elevation, 77S-94 · K4-3Front elevation of the Kivi 4: horizontal board walls between black corner posts, a cedar door with a tall glass strip on the left, a fixed window beside it, and a wide board panel with one black batten on the right, under a black top band and metal roof. 8 feet 5 inches wide, 9 feet 2 inches from grade to roof.8'-5" OVER POSTS9'-2" GRADE TO ROOFBLACK PBR ROOFFIXED WINDOW23¼ × 35¼BLACK BATTENOILED 2×6 BOARDSCEDAR DOOR
77S-94 · K4-3Front elevation1/2" = 1'-0"
Section B-B, 77S-94 · K4-2Side section of the Kivi 4, back wall on the left and front on the right: an upper bench at 48 inches with a three-slat backrest and 42 inches of headroom, a foot bench at 32 inches, a Harvia Cilindro stone-tower heater on a tile pad near the front wall, and the air path from a low intake, up through the stones, across the ceiling and out through a low exhaust on the back wall.42" HEADROOMCILINDRO 9 kW,STONES AROUNDTHE ELEMENTSLOW INTAKEWINDOW+32" FOOT BENCHDRYING VENTLOW EXHAUST
77S-94 · K4-2Section B-B3/4" = 1'-0"
Floor plan, 77S-94 · K4-1Floor plan of the Kivi 4: 8 feet 5 inches by 5 feet 7 inches over the posts, 94 by 60 inches inside. The upper bench runs the full width of the back wall with the foot bench in front of it and a small step by the left wall; the stone-tower heater stands on a tile pad in the front right corner; the door, at the front left, swings out.8'-5" OVER POSTS5'-7"UPPER BENCH +48",FOUR SEATSFOOT BENCH +32"CILINDRO 9 kWSTEP +16"DOOR SWINGS OUT,NO LOCK
77S-94 · K4-1Floor plan3/4" = 1'-0"

Questions

How long does it take to heat?

We estimate 45 to 70 minutes to 175°F on a summer day (90°F outside) and about 2 to 3 hours on a winter evening (35°F outside). The heavy stones and uninsulated wall are the reason. Below freezing, expect 160 to 180°F rather than 190°F. We will publish measured times from the first build.

How is it different from the Kivi 2?

It is 34 inches wider, with the same depth, height, roof and bench heights. That gives four seats at about 23½ inches each. It also moves up to a 9 kW stone-tower heater, because an 8 kW box heater would be near the top of its range in this room.

Does it need a permit?

An electrical permit, always. The building itself depends on your town and county. We check for your address before we build.

What power does it need?

A 240 V circuit for the 9 kW heater, typically 50 A, run by a licensed electrician. We can arrange it or work with yours.

What does the site need?

Reasonably level ground we can get to. It arrives whole, or we assemble it quickly on the spot if needed. It sits on 4×4 pressure-treated skids, so no slab is required. Delivery and site prep are not in the price; we look at both when we walk the site.

Get a quote on the Kivi 4.

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See it in your yard
Rendering of a sauna on a lakeside deck at dusk, its window lit, with a dock and a fire pit beyond.
Architectural rendering, not a photograph of a completed build.
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