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"We design, permit, and build beautiful backyard homes in the Bay Area. Completely custom to your property, no subcontractors to deal with, and with a fixed price contract."

Bespoke homes.
Effortless experience.

Every ONE is tailor-made to how you use your space and where you live—featuring floor-to-ceiling windows, precision fabrication, and beautiful built-ins. And with complete upfront predictability on cost and timelines, we’ve made the experience of homebuilding delightful and effortless.

Take a Virtual Tour in 3D

One Step Design

Skip the architect and general contractor interviews.


Simply choose your design, customize it to your liking, and watch as your dream ADU comes to life—hassle-free.

One Less Thing To Worry

Choose from a range of customizable designs that fit both your budget and style.


Rest easy knowing your new space is crafted to the highest standards of sustainability and elegance.

One Stream Process

Experience seamless integration from design to construction.


High-quality materials and expert craftsmanship ensure your project is efficiently managed and beautifully realized.

Tailor to Highest quality

All our material suits the highest health standards.

And our software drives the entire process from start to finish—from zoning research, design, and permitting, to manufacturing & quality control.

Ready to build?

Start ONE





Sunnyvale, 94085, CA


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© 2024 by  ADU ONE

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