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ADU Design Gallery

The County maintains an online listing of pre-reviewed detached accessory dwelling unit (ADU) plans as part of the new ADU Ready program. Property owners seeking to permit an ADU may use these plans to reduce plan check times and fees.

The new 2025 California Building Standards Code took effect at the start of the new year! Pre-reviewed designs eveluated against the 2022 California Building Standards Code are no longer valid. Permit Sonoma is working to obtain updated designs. New and existing plan vendors are encouraged to submit new designs or renew listings with updated plan sets.

Project Applicants Start Here

  • Applicants must contact the design plan vendor directly using the information below to obtain a pre-reviewed ADU plan package. Project applicants are responsible for licensing fees and limitations on pre-reviewed plan use as required by plan vendors.
  • Applicants should review ADU Ready, Standards for ADUs, and Building an ADU before obtaining a pre-reviewed ADU plan package. Projects using pre-reviewed plans will still need to conform to site-specific requirements and ADU designs will need to be integrated into the overall submittal package for a building permit. Be sure to select a plan that fits your parcel’s needs.
  • The “pre-reviewed” status of posted plans expires at the end of each code cycle. Complete building applications must be submitted using current pre-reviewed plans.

(Designers: You may add your ADU plans to this list by submitting your plan set with a stock plan (STK) application and associated plan check fee.)

Select the plan name or photo to view an image gallery for that plan.

↓↑ Sort Column Alphabetically or Numerically: The table is presorted by bedroom count, then by square footage. Select the column title of the column you want to sort. This is helpful if you want to display the list in order by one of the other columns.

Reference Number Plan Name & Photo Bedroom Count Square Footage Height Design Firm

Factory Built (Expired)

Abodu Studio

Abodu Studio

Studio

340

13ft 5in

ABODU

Factory Built (Expired)

Abodu One

Abodu One Exterior

1

500

13ft 5in

ABODU

Factory Built (Expired)

Millie L

Millie L ADU

1

615

 

Inspired ADUs

hello@inspiredadus.com
(510) 903-9694

Factory Built (Expired)

Abodu Two

Abodu Two

2

610

13ft 5in

ABODU

Factory Built (Expired)

Millie T

Millie T ADU

2

732

 

Inspired ADUs

hello@inspiredadus.com
(510) 903-9694

STK24-0027 (Expired)

Agrarian, The

Agrarian ADU

2

749

15ft 4in

Mayberry Workshop

hello@mayberryworkshop.com
Bay Area: (408) 359-1411
Northern CA: (530) 298-6650

STK24-0030 (Expired)

Five Gables

Five Gables ADU

2

798

 

J Kretschmer Architect

STK24-0028 (Expired)

Barnhouse, The

Barnhouse ADU

2

900

15ft 4in

Mayberry Workshop

hello@mayberryworkshop.com
Bay Area: (408) 359-1411
Northern CA: (530) 298-6650