Prefabricated ADUs · Oregon · Washington · California

Precision,
at home.

Architect-designed. Built from factory panels. Tell us where you want to build and we'll tell you what's possible, what it costs, and who builds it.

R-30Insulated wall assembly
16″Stud spacing, on center
20+Years of architecture
3States served
The lineup

One system. Three sizes.

Every model shares the same panel rules, the same details and the same standards. Choose the footprint that fits your lot.

PL 384

Studio

PL 576

One bedroom

PL 768

Two bedroom
Configure

Build yours. Turn it around.

Choose a model, roof, size and finish. The model, the panel count and the quantities update as you go. Drag to look around.

Drag to orbit
Model
Roof
Performance
Finish
View
Floor plan
Energy performance
How would you like to build it?

Planning estimate—
Estimated monthly payment
—

Take it into your own tools: (Twinmotion, Rhino, Archicad)
On site

From truck to roof.

The wall panels and roof cassettes arrive numbered and are set by a telescopic-boom machine. Press Watch it go up in the configurator to see it, then look around the site below and check the boom reach for the unit you chose.

Engineering

Every wall, numbered.

Each wall is split into factory panels, and every panel carries its own ID from the model to the fabricator to the site. Switch the configurator to Panels to see them.

  • Panelised walls. Openings get their own panel, with king studs either side.
  • One model. The same parameters drive the drawings, the panel schedule and the take-off.
  • No guesswork on site. Panels arrive labeled and in order.
PANEL WIDTH 16" O.C. PANEL N-07
Ways to build

Choose how much we take on.

01

Design & Kit

Configured unit, permit-ready plans for your lot, and the factory panel package. For owners and builders who know the way.

02 · Most chosen

Managed

Everything above, plus lot review, permit handling and a vetted partner builder. One point of contact.

03

Turnkey

One contract with Trillium Design Build for design, build and warranty. Select areas.

The studio

Architecture is where we belong.

Willard Williams Architect brings 20+ years to high-end residential, commercial, healthcare and mission-critical work, with deep expertise in BIM and building technology. The same discipline sits behind every unit.

Pacific Living Solutions

Prefabricated units, configured online.

Trillium Design Build

Builder of record for turnkey projects.

Custom architecture

Residential and commercial design, consulting and BIM.

Contact

Tell us about your lot.

Free quote. 10% off for veterans, seniors, teachers, students and emergency services personnel.

Email us (425) 951-9459