Backyard Cottages / Detached ADUs

A backyard cottage, also known as a Detached Accessory Dwelling Unit (DADU), is a great way to accommodate your desire to provide additional housing on your property. Whether used as a home for aging relatives or rented out to tenants, a backyard cottage provides a valuable space. These versatile units add density to the city in a way that is sustainable and livable.


Added "mother-in-law" unit to existing house on a tight site. Compact living arrangement on one level in 600 square feet. Features cathedral ceiling, sunny kitchen with laundry area, front porch and side deck.

Back to Top


This new garage/studio features a two--car garage with shop space on the main level, and a studio above with a deck. Total main floor is 954 square feet. Studio is 405 square feet with 120 square feet of upper floor deck.

Back to Top

backyard cottage (dadu) (west seattle 2013)

This is a compact two-story cottage design with a total of 777 sq ft. The main floor features a small recessed entry, kitchen, bath, and laundry areas. The upstairs is a large open bedroom with a half bath, and a small porch with a view.


Back to Top

dadu over garage (NE seattle 2015)

This unbuilt one-bedroom apartment is over an existing two-car garage. Total apartment is 392 square feet. Awaiting change in DADU rules for construction.


Back to Top

studio dadu (Lopez island 2019)

This unbuilt studio apartment is over a new two-car garage. Total apartment is 624 square feet, including stair down to garage. Kitchen features a brick pizza oven. Studio has three pairs of french doors that open onto a large deck. Also features a cathedral ceiling.

Back to Top