When does attached make sense?
When the back yard is small, when you want to use existing utility connections, or when an addition fits the lot better than a separate cottage.

What is different from a detached ADU?
It ties into the house: the roof, the foundation and often the fire separation between the units. That shared wall is designed carefully for sound and fire.
Can part of my house become the ADU?
Yes. Converting existing space, such as a basement or a wing of the house, is often simpler than building new, and state law treats conversions more flexibly on size and setbacks.
Attached ADUs
The city flyer caps an attached ADU at 50 percent of the main dwelling. The unit needs its own outside entrance.
Related
Is your lot ready for an ADU?
Send your address and a sentence about what you want. We look up the zoning, setbacks and utility routes and reply with the ADU types that fit.
We build in Stockton, CA.
