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Paradigms & methods·applied

Passive House Standard

Why it matters

Passive House is the rare thing in sustainable building: a standard with teeth. Fifteen kilowatt-hours per square metre per year for heating — a measurable number that a building either meets or does not. Its value to the movement is exactly that ruthlessness. It converted "energy-efficient" from an adjective into a threshold, proved across tens of thousands of buildings that near-zero heating demand is buildable in cold climates, and gave every project an honest ruler. Our relationship with the ruler is deliberate: we measure against it always, and obey it selectively. A benchmark's highest use is not compliance but calibration. Knowing exactly how far from 15 you stand, and why, is worth more than a certificate.

Role in 001's holistic picture

The standard is the ruler held against the Energy-Efficient Envelope. Its components are the envelope disciplines plus Heat-Recovery Ventilation, shaped by Passive Solar Design. Its creative tension in our work is with Systemic Affordability: the two pull opposite ways, and our projects document where each wins and at what price. That is more useful to a reader than either dogma.

In the world

The certified definition is deliberately unforgiving: heating demand no greater than 15 kWh/m²·yr, airtightness no greater than 0.6 air changes per hour at 50 Pa, strict comfort criteria. All of it is verified by measurement and a blower-door test, and reached through super-insulation, thermal-bridge-free detailing, high-performance windows and heat-recovery ventilation. Where that ruler gets met matters as much as the number. And the scale at which that already happens counts most: Goldsmith Street in Norwich is 105 Passivhaus council homes — plain terraced streets, ordinary tenants. Reported tenant energy bills there run around £150 a year, roughly 62% below comparable standard homes. The same demanding standard, proven not as an eco-showpiece but as ordinary social housing, delivering low bills to the people who need them most.

How 001 engages with it

Our three flagship projects stand at three deliberate distances from the ruler. House 001 stands far from the benchmark: its envelope was drawn at a deliberate 20 cm baseline for experimenting with natural insulation. How far, honestly, we can no longer say: its heating electricity (42.77 kWh/m² a season) is measured, but the heat pump's COP never was. And that season ran on air-to-air heating — a mode the house was not designed for. We publish the uncertainty without cosmetics, because it is exactly the data self-builders need. The Hlibivka design targeted the range explicitly: 15 kWh/m²·yr as the desired figure, 35 as the minimum acceptable. The airtightness spec (0.6 ach@50Pa) was written straight from the standard. Unity Hub designs with the ruler in view — a low-energy envelope with a peak load of about 22 W/m² at the −20 °C design temperature, twice the passive threshold. Our published heating and cooling stories show what that discipline buys: heating debates that become low-stakes and a cooling system with almost no machines. Three projects, three distances, all measured against the same honest ruler.

And the ruler reads in Ukrainian. The country's first certified Passive House is architect Dr. Tetiana Ernst's Sunshine Home, Kyiv, 2008. It has stood in the Institute's Darmstadt database ever since: twenty-four centimetres of foam glass in the walls, the full 0.6-air-changes airtightness verified by blower door, ventilation recovering 88% of outgoing heat. House 001's story crosses hers directly: in the early stages of its design we took a paid consultation from Dr. Ernst. So the distance we publish above is measured against a ruler we received first-hand. A decade later a Ukrainian startup took the standard past where Darmstadt aimed it: Haus.me was born in Ukraine as PassivDom, founded by engineer Maksym Herbut. It builds modular prefab houses that hold the passive threshold and then cut the cords entirely: solar-fed through winter, battery-backed, purifying their own water and handling their own sewage. Assembly takes three to four weeks with, in the company's words, a screwdriver and a wrench. The passive envelope turns out to be the natural chassis for full autonomy. That is our thesis too, arrived at independently on a different budget.

Maturity: applied. The standing benchmark of our envelope work: targeted at Hlibivka, approached at Unity Hub, honestly missed and documented at House 001.

Further reading