Detached ADU design

Detached
ADUs.

Standalone dwelling units separated from the main residence. Maximum privacy for tenants and owners. The most popular ADU type in California.

400 to 1,200 sq ftTypical Size
$12,000 to $22,000Design Fee Range
2 to 4 months designTotal Timeline
About Detached ADUs

The detached adu explained.

A detached ADU is the gold standard for rental income and family privacy. It is completely separate from the main house, which means tenants have their own entrance, their own address, and their own yard. Resale value is maximized because the unit is functionally independent.

Construction Cost

$250,000 to $500,000 construction

Design Fee

$12,000 to $22,000

Size Range

400 to 1,200 sq ft

Timeline

2 to 4 months design, 6 to 9 months construction

Ideal For

When a detached adu
makes sense.

Rental income, adult children returning home, aging parents, guest accommodations

Key considerations

01

Detail 01

Setbacks as close as 4 feet from rear and side property lines

02

Detail 02

Separate utility meters often make sense for rental income

03

Detail 03

Can be sold as separate property in some jurisdictions under SB 9

04

Detail 04

Best placement depends on site access, solar orientation, and neighbor considerations

Ready to build
a detached adu?

Start your ADU building program online. David will call within one business day.

Start Your ADU → Call (805) 444 1230