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Portland’s rotating skinny house follows the sun like a sunflower

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A tiny house in Portland turns itself toward the sun like a sunflower chasing daylight.

Architect Ben Kaiser built a 144-square-foot house that doesn’t sit still. Named “359” for the rotation it stops just short of completing, the structure sits on a manually operated turntable and can be spun by hand to chase warmth in winter or duck into shade in summer. It’s a small idea with a big pitch behind it: passive solar heating, minimal utility bills, and a design Kaiser once floated as a fix for affordable housing.

• The 12-by-12-foot house rotates on a hand-powered turntable that just one adult — or two kids on the leverage bar — can push around.
• It stops at 359 degrees instead of a full 360 to keep the plumbing, sewer, and electrical lines from twisting and tangling.
• Built to the 12-foot trucking width limit, the whole unit can be trucked on a flatbed and set down by crane, and the fully wired, plumbed Portland prototype ran about $145,000, versus Kaiser’s roughly $90,000 target for an off-grid prefab version.

Mechanism of the Rotation Process

The 359 isn’t motorized — there’s no motor, no app, no button to press. It’s a turntable and a bar, and whoever’s inside just walks it around. Kaiser designed it to fall one degree shy of a complete circle specifically so the utility lines feeding the house don’t wind themselves into a knot every time someone spins it. That one-degree gap is the whole trick: it lets the house rotate freely in either direction without ever needing a swivel joint on the plumbing or wiring.

Chasing the Sun Like a Sunflower

Nearly all of the glazing is stacked on one side of the house, floor to ceiling, so the building behaves like a single giant window on a hinge. In winter, occupants turn that glass wall to face the sun and let passive solar heating do the work; on a cloudy day, a standard 110-volt heater is enough to keep the 144-square-foot space warm. In summer, the same wall gets rotated into shade to keep the interior from cooking.

“If the sun is too hot, turn 359’s back to it. If the winter sun is desired, let the light shine in.”

A Housing Pitch That Didn’t Quite Ship

Kaiser’s bigger ambition was never really about one backyard novelty. He envisioned prefabricated, off-grid 359 units built in a warehouse and clustered on city-owned land — a fixed-cost, drop-and-plumb approach to affordable housing or homeless shelters, with each unit priced around $90,000 before customization. The logic mirrors the DIY house-and-home crowd chasing efficient, low-footprint builds like the ones covered in this metal house cost breakdown, where the appeal is the same: fixed pricing, minimal site work, fast turnaround. The Portland prototype, though, ended up fully wired and connected to municipal water and sewer, pushing its total build cost to roughly $145,000 — a long way from the stripped-down, off-grid version Kaiser originally pitched.

Life as a Backyard Guest House

Today the completed 359 sits in a Portland backyard, working as a guest house and short-term rental rather than a homeless-shelter prototype. The rotation still earns its keep: guests can spin the glass wall away from the main residence for privacy, or toward it for a view, all by walking the bar around the turntable themselves. It’s the kind of small-footprint, big-idea build that shows up again and again among readers drawn to projects like the Pinecone Treehouse tiny home, where square footage is scarce but the design does double duty anyway.

Kaiser never got his cluster of 30 units on city-owned land, and the 359 that exists today is a one-off backyard rental rather than a housing solution. But the math he laid out — a fixed prefab cost, a crane drop, a garden-hose hookup — is still sitting there for the next city planner who wants to run the numbers on it.