ADU model · Classic cottage
1 Bed ADU 450
450 sq ft · 1 bed · 1 bath
A compact one-bedroom that still feels like a real home: an open living room and kitchen, a full bathroom and a separate bedroom.
Good for: A guest suite, a home office, a first rental, or a smaller backyard.
Typically $164k - $212k design to move-in, plus city permit and PG&E fees
- Size
- 450 sq ft
- Bedrooms
- 1
- Bathrooms
- 1
- Footprint
- 18 × 25 ft
- Typical timeline
- Under a year
The layout
What’s inside
Open living and kitchen on one side, the full bathroom in the middle, and the bedroom with its closet and stacked laundry on the other side.
Open living room and kitchen
Full bathroom
Bedroom with closet
Stacked washer and dryer
Outside: gray lap siding and a simple gable roof.
Make it yours
A starting point, not a catalog
Starting from a model saves time on the drawings. We draw the final plans for your lot, then take them through your city’s permits. Along the way you can change:
Finishes: our standard package, or custom finishes chosen with you
Outside: siding, colors, roof and windows
Layout: room sizes, walls, doors and the kitchen
Size: larger or smaller to fit your lot
What it typically costs
$164k - $212k
For 450 sq ft at $365 - $470 per sq ft. That includes design, engineering, permits, construction and a finish allowance of about $20,000.
Not included: city permit fees, PG&E connection fees, and extra inspections some cities require from outside inspectors. Your exact number comes after we see your property, and it is locked in your contract.
Images are 3D renderings of the base designs. Final plans are drawn for your lot after the site visit.
Other models
See all models
Next step
Like the 1 Bed ADU 450? See if it fits on your lot.
We review every request within 1 business day. If it’s a project we take on, we call you to talk through your lot, your city’s rules and a rough budget. There’s no cost to find out.
Or call (510) 453-0400, Monday to Friday, 9am to 5pm.
