Passive house · timber frame · Obihiro
Warm all January, from the slab up.
We design and build certified passive houses in larch and spruce for the Tokachi plain. This is the wall of every house we hand over, one layer at a time.
300 mm of EPS under a 150 mm steel-reinforced raft, poured below the frost line so no cold reaches the floor.
Tokachi larch and spruce studs, cut and pre-assembled as wall panels in our Memuro workshop, raised on site in four days.
360 mm of cellulose and wood-fibre board, sealed by a taped membrane. Tested at 0.4 air changes per hour at 50 Pa.
Timber tilt-and-turn frames, Uw 0.72, set into the insulation plane and taped so the reveal stays warm to the touch.
Untreated vertical larch on a 30 mm vented batten, left to silver. Snow load and wind drive are handled before the boards go on.
A blower-door test, a heat-recovery unit commissioned room by room, and keys. Heating demand: 14 kWh per m² a year.
Same plot, same family, same winter: 92 % less to heat than a house built to the 1999 standard.
Heating cost comparison
The cheapest heater is the wall you already paid for.
Figures use measured heating demand from our last nine houses against the national standards they replace, at 2025 kerosene and heat-pump prices in Tokachi. Hot water and appliances are not included.
Finished homes
Houses already lived through a winter.
Otofuke House
Two storeys for a family of five on a south slope, charred-larch cladding and a deck that clears its own snow. Fixed price ¥41.2M; first-winter heating ¥26,800.
Ask for a house like this →Makubetsu Hill House
A compact house for a retired couple, built into the hill with the bedroom on the warm side. Fixed price ¥33.4M; the heat pump runs about 40 days a year.
Ask for a house like this →Nakasatsunai Farmhouse
A farming family's new house beside their bean fields: one long kitchen where the low sun reaches the back wall in December. Fixed price ¥44.9M.
Ask for a house like this →
Shimizu Studio HouseSpruce lining, 6:40 on a February morning. Outside −19 °C, inside 20.8 °C, heater off since midnight.
Inside, at −20 °C outside
Sit by the window in February.
- Every room
- 20–22 °C, day and night
- Window surface
- 17 °C on the inner pane
- Fresh air
- Filtered, every room, 88 % of heat kept
- Humidity
- 40–50 %, no condensation
- Heater
- One small heat pump for the house
From first call to keys in about fourteen months.
Every step and its cost →- Month 0Plot visitWe walk the plot with you, check sun, snow drift and ground, free of charge.
- Months 1–3Design and energy modelPlans drawn with you, every room checked in the passive-house model.
- Month 4Fixed priceOne contract figure, valid for the whole build. No allowances.
- Months 6–9Slab and workshopSlab poured before the frost; walls made indoors in Memuro.
- Months 10–14Raise, close, finishFrame up in four days, blower-door test, then keys.
“Our old house in Obihiro burned eighteen cans of kerosene a winter. This one, we forgot to switch the heater on until the end of November.”
- December
- ¥3,600
- January
- ¥4,100
- February
- ¥3,900
Plots, budgets, first questions
Tell us where your plot is.
Two answers and an email. Rie or Daichi replies within two working days with a first cost range for your plot.
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