BuiltSnohomish
Snohomish · one level
One level · attached garage · vaulted great room
Backyard homes · DADUs
A second home, in your own back yard.
For a parent, grown kids, or rent — a detached home on the lot you already own. Most Washington city lots may now hold two.
Check my property, freeFree · No obligation
Who does this
Nobody does it for the square footage.
For your parents
Close, but separate
Sunday dinner together. Every evening apart. Instead of $6,975 a month in assisted living (Genworth, 2024).
For grown kids
A first place nearby
More than half of 18-to-24-year-olds live with their parents — 57% of men, 55% of women (U.S. Census, 2024). Everyone gets their door back.
For income
Rent that carries the mortgage
A one-bedroom in Everett rents for an average $1,577 a month (Zumper, October 2026). Estimate a backyard home and its rent →
For later
An address you can sell
State law lets the unit be sold as its own condo.
Built around Puget Sound
Four that got built.
Built Built · 2024Maple Leaf, Seattle
Maple Leaf · two levels
1,205 sq ft · 2 bed · 2.25 bath · two levels
Built · 2025NE 96th St, Seattle
NE 96th St · two levels
Two levels over a garage · rooftop deck
BuiltKirkland
Kirkland · two levels
≈ 1,198 sq ft · two levels · 607 sq ft footprint
Four built homes around Puget Sound, photographed as finished. Credited by place.
Design ideas
Pick a size. Then see what fits.
RenderingCompact · one level
The Alder
520 sq ft · 1 bed · 1 bath · one level
See the design →BuiltOne level, with a garage
The Cedar
800 sq ft + 249 sq ft garage · 2 bed · 1 bath · one level
See the design →BuiltTwo-story, small footprint
The Willowmere
1,000 sq ft · 2 bed · 2.25 bath · two levels
See the design →
RenderingThree bedrooms, with a garage
The Phinney
995 sq ft + 424 sq ft garage · 3 bed · 2 bath · two levels
See the design →BuiltTwo levels, 2–3 bedrooms
The Backyard Residence
1,100–1,300 sq ft · 2–3 bed · 2.5 bath · two levels
See the design →Designs offered by HousUp's partner builder for Washington; its prices and plan sets are on its own page. HousUp doesn't build or set prices. All the designs, by size →
Pre-approved plans
Plans your city has already approved.
A pre-approved plan skips the design review: the city has already checked the drawings, so the permit review is about your lot. Pick your city.
Loading the plans…
Pictures are the official pages’ own. A pre-approved plan is not a permit: the city still reviews your site.
What the report checks
Your city's rules, on your parcel.
From public records
Units, size, height, setbacks, coverage, parking, flood, slope, sewer.
Only on site
Truck access, protected trees, the sewer lateral, easements, your HOA.
Sizes and costs
400 to 1,200 square feet. Seven to fourteen months.
Published 2026 figures put a detached backyard home in Snohomish County at about $270,000 to $450,000 and up. Your report gives the range for what fits your lot.
Eleven design ideas
520 to 1,300 sq ft, footprints to scale. See the designs → · the cost guide →
Seven to fourteen months
Design to move-in. Permitting is the slow part.
A sourced planning range
Every rate dated. Never a promise.
Three quick questions
Do I have to live on the property?
In most Washington cities, no. Your report says which rule your city uses.
How big can it be?
Cities can't cap it under 1,000 sq ft. Your setbacks usually decide first.
Can I sell it separately?
State law says yes, as a condo. The report says whether that's realistic on your lot.