Modular prototype

2000 SF, 4 Beds, 2.5 bath


This four-mod prototype plan is our nod to the traditional American four-square home. The name reflects the beautiful neighborhood in Seattle that helped inspire the resurgence of the American bungalow movement, which saw a return to small homes in walkable communities. It is a good fit for lots that are about 40’ wide in urban neighborhoods.

This design has a few moves that make it special. A garden-style entry offers a screened-porch space and overwinter space for potted plants. It also features a parcel pickup and delivery box. High ceilings and high windows create a light-filled atmosphere. A generous modern stair with a reading nook and bookshelves.

This stock plan can be stick built, panel built, or modular built, demonstrating our flexible path approach to project deployment. It is deep green (passive house, net-zero, net-positive) friendly, and mass timber friendly.

modular (prefab) friendly:

This home may be prefabricated as (4) modules and shipped to the site virtually complete, with nearly all interior and exterior finishes. After prep work on site, the modules may be delivered in one day with a crane.

Prep site work includes:

  • Excavation & grading

  • Concrete footings with CMU stem walls

  • Utility trenching and connections (electrical, water, sewer, gas (option), stormwater)

  • Crawl space vapor barrier and radon venting

  • Foundation waterproofing

  • Exterior landscaping & hardscaping

Final stitch site work includes:

  • Structural connections between modules and to the foundation.

  • An airtight/watertight seam to patch along exterior marriage-lines and the roof.

  • Apply soffit finish boards and trim boards in some locations.

  • Interior trim boards applied to cased openings between modules.

  • Vertical service connections (mod-to-mod) must be patched in a convenient vertical chase at the stair, and concealed with a finish plywood panel.

  • Connection of services to site utilities.

passive house friendly:


This home has been designed with thick exterior walls, a high-performance European window & door package, deep overhangs, continuous heat-recovery ventilation, and efficient heating & cooling.

It is highly recommended that windows be configured to reflect the orientation and exposure of the site. These features may allow the house to meet passive house standards of energy efficiency in the coastal Pacific Northwest.

mass timber friendly:

This home has been designed to utilize 5-1/2” cross-laminated timber (CLT) floor slabs as an option. These slabs are suitable to be exposed as finish flooring, as well as the finish ceiling (seen from below), and are prefabricated from five layers of laminated timber. There is no plumbing in the floor.

Floor finish on a CLT slab.

Floor finish on a CLT slab.

Cross section of a 5-ply CLT slab.

Cross section of a 5-ply CLT slab.

our prototypes:

Our prototype plans are prefab-friendly stock plans that may be permitted as master plans by each state. Local permits are still required. We are available to modify our designs to meet the needs of the client, the conditions and orientation of the site, and any applicable local zoning regulations.

for more information:

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