Quadra 4 — 400 sq ft Prefab ADU

400 sq ft · 1 bedroom · 1 bath · CSA A277 certified · delivered and installed in Whatcom, Skagit, and Island counties

Quadra 4 floor plan — 400 sq ft, 1 bed, 1 bath prefab ADU

Quadra 4 floor plan · overall footprint 20'-1" × 20'-1"

Starting at

$182,500

Delivered unit, USD. Site prep, permitting, foundation, utilities, crane, and install are quoted separately.

Size
400 sq ft
Bedrooms
1
Bathrooms
1
Footprint
20'-1" × 20'-1"
Certification
CSA A277
Build to delivery
From 12 weeks
Build Yours

Free 30-minute consultation first — we talk through whether the plan fits your lot before you commit to anything.

Interior & Exterior

Quadra 4 prefab ADU — view 1Quadra 4 prefab ADU — view 2Quadra 4 prefab ADU — view 3Quadra 4 prefab ADU — view 4Quadra 4 prefab ADU — view 5

400 sq ft in a 20 × 20 square. Kitchen with island, living room, and a separate bedroom with queen bed and closet — a genuine one-bedroom unit on a footprint small enough for most lots.

  • Prefabricated, move-in ready
  • Separate kitchen, bedroom and living room
  • Open and spacious
  • Sustainably built, using CLT (cross-laminated timber)
  • Thoughtfully designed space
  • Glass slider door and large windows allowing for lots of beautiful natural light

Why Factory-Built

Affordable

A prefabricated, efficient build process needs less time and less labour on site, and that shows up in the price.

Sustainable

Clean construction methods and renewable materials from local, sustainably managed forests — including a cross-laminated timber floor plate.

Customizable

Every unit is expandable and modular, with interior and exterior options you pick during design.

Prefabricated

Built indoors in a controlled environment, so weather and the usual site delays never touch the structure.

Turnkey

We handle everything: feasibility, permitting, design, factory order, site prep, foundation, utilities, and install.

Timeline

From order to delivery can take as little as 12 weeks, with site prep running in parallel.

CSA A277 Certified

Every unit is CSA A277 certified, factory-inspected to the same code standard as site-built construction.

Canadian Made

Handcrafted in the Fraser Valley, British Columbia — a two-hour drive from Bellingham.

Free 30-minute consultation

Talk through your property.

The consultation is free and takes 30 minutes. Loren, who runs your build from the first call through inspection, calls you the same day. Site visits and permitting are paid work.

No payment to talk. Call now, or send the details and we call you.

(360) 594-0120 Book a call