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Detached ADU · Hillsborough, CA

A quiet modernist in the backyard.

A detached ADU with a floor-to-ceiling bi-fold glass wall, black composite cladding, and a book-matched marble bath. Foundation to finish in 15 months, documented every step.

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About This Project

Backyard building, no compromises.

Most ADUs are compact by necessity. This one is compact by choice, and every inch earns its keep. A full bi-fold glass wall opens the living room into the garden, the marble bath reads like a boutique hotel, and the exterior finish holds up to a close look.

Location
Hillsborough
Project Type
Detached ADU
Build Time
15 Months
Completed
March 2026

What's In Here

Details that earn a second look.

  • Floor-to-ceiling bi-fold aluminum glass wall opens the living space onto the backyard.
  • Black composite wood-grain cladding paired with warm white stucco for a restrained contemporary exterior.
  • Book-matched veined marble bathroom, floor-to-ceiling, with brass fixtures and a skylight.
  • Toto smart toilet, walk-in marble shower, and custom vanity with integrated lighting.
  • Open-plan living, dining, and kitchenette with white oak hardwood and black cabinetry with brass pulls.
  • Full California 2025/2026 ADU code compliance (SB 543, AB 1154, AB 462 where applicable).
  • In-house plumbing, electrical, and finish work — same crew start to finish.

Process · 3 Stages

Foundation, envelope, finish.

A 15-month build, told in three chapters. Scroll down for the full gallery.

Hillsborough ADU framing against tree line, January 2025
Stage One · Framing
January 2025
Hillsborough ADU interior framed with bi-fold door wall, June 2025
Stage Two · Envelope
June 2025
Hillsborough ADU finished exterior with bi-fold glass doors, February 2026
Stage Three · Finish
February 2026

Thinking about an ADU?

Let's walk the lot together.

California's 2026 rules opened up design flexibility for Peninsula backyards. We'll help you see what's possible on yours, and give you an honest read on timeline and scope.

Let's talk