Accessory Dwelling Units - ADUs

8/31/2020 Garden Cottage Program Update:

Beginning Monday, August 31, 2020, the Town of Danville has begun the Garden Cottage Program, which will allow residents access to free, pre-approved, permit-ready, printable, construction plans for the building of Accessory Dwelling Units (ADU).  

Danville Garden Cottage Flyer (PDF)

An ADU is a self-contained living unit that is usually smaller than the main home on the same property. It contains a kitchen, bathroom, and sleeping area.  ADUs can be attached to an existing home or may be a separate detached building.  

Under the Garden Cottage Program, residents can select from a range of ADU plans that will include Studio (640 sq ft), 1 bedroom/1 bath (840 sq ft) and 2 bedroom/2 bath (approx. 1000 sq ft).  These customizable plans, designed by local architects, will be offered in three architectural styles:  Craftsman, Mediterranean, and Contemporary.  

Applicants will need to consult with appropriate design professionals to prepare a site plan and any necessary grading plans. Each project is unique and may require additional approvals and fees from other agencies. Town staff can provide assistance with the application process and advise if additional approvals are required. For permitting assistance, call (925)-314-3330.

For more information, contact Civil Engineering Associate Guillermo Santolaya at (925) 314-3352 or gsantolaya@danville.ca.gov.

Plans can be viewed and printed below:

FREE, PRE-Approved, permit Ready CONSTRUCTION Plans

  1. Studio Contemporary 640 sq ft (PDF)
  2. Studio Craftsman 640 sq ft (PDF)
  3. Studio Mediterranean 640 sq ft (PDF)
  4. 1 Bedroom Contemporary 840 sq ft (PDF)
  5. 1 Bedroom Craftsman 840 sq ft (PDF)
  6. 1 Bedroom Mediterranean 840 sq ft (PDF)
  7. 2 Bedroom Plan Selection Guide 1000 sq ft (PDF)
  8. 2 Bedroom Contemporary Left Upslope 1000 sq ft (PDF)
  9. 2 Bedroom Contemporary Left Upslope with Piers 1000 sq ft (PDF)
  10. 2 Bedroom Contemporary Left Downslope 1000 sq ft (PDF)
  11. 2 Bedroom Contemporary Left Downslope with Piers 1000 sq ft (PDF)
  12. 2 Bedroom Contemporary Right Upslope 1000 sq ft (PDF)
  13. 2 Bedroom Contemporary Right Upslope w Piers 1000 sq ft (PDF)
  14. 2 Bedroom Contemporary Right Downslope 1000 sq ft (PDF)
  15. 2 Bedroom Contemporary Right Downslope with Piers 1000 sq ft (PDF)
  16. 2 Bedroom Craftsman Left Upslope 1000 sq ft (PDF)
  17. 2 Bedroom Craftsman Left Upslope with Piers 1000 sq ft (PDF)
  18. 2 Bedroom Craftsman Left Downslope 1000 sq ft (PDF)
  19. 2 Bedroom Craftsman Left Downslope with Piers 1000 sq ft (PDF)
  20. 2 Bedroom Craftsman Right Upslope 1000 sq ft (PDF)
  21. 2 Bedroom Craftsman Right Upslope with Piers 1000 sq ft (PDF)
  22. 2 Bedroom Craftsman Right Downslope 1000 sq ft (PDF)
  23. 2 Bedroom Craftsman Right Downslope with Piers 1000 sq ft (PDF)
  24. 2 Bedroom Mediterranean Left Upslope 1000 sq ft (PDF)
  25. 2 Bedroom Mediterranean Left Upslope with Piers 1000 sq ft (PDF)
  26. 2 Bedroom Mediterranean Left Downslope 1000 sq ft (PDF)
  27. 2 Bedroom Mediterranean Left Downslope with Piers 1000 sq ft (PDF)
  28. 2 Bedroom Mediterranean Right Upslope 1000 sq ft (PDF)
  29. 2 Bedroom Mediterranean Right Upslope with Piers 1000 sq ft (PDF)
  30. 2 Bedroom Mediterranean Right Downslope 1000 sq ft (PDF)
  31. 2 Bedroom Mediterranean Right Downslope with Piers 1000 sq ft (PDF)

Accessory Dwelling Units

An Accessory Dwelling Unit (ADU) is a self-contained living unit that is usually smaller than the main home on the same property. It contains a kitchen, bathroom, and a place to sleep. They can be attached to the main home or a separate detached building. They can also take the form of a Junior Accessory Dwelling Unit (JADU), which is a unit up to 500 square feet and are converted from any existing floor space (bottom illustration).

Three different types of ADU

ADUs have been an effective way of incorporating smaller living units into the fabric of the community that are affordable to a wider range of income levels, including elderly family members.   

CHANGES IN STATE LAW  

Due to the housing shortage in California, the State Legislature has passed significant housing related laws in the past three years. In 2019, the legislature passed over 20 bills intended to fast-track housing production – including accessory dwelling units (ADUs). 

Updates to State Law expands areas and conditions under which ADUs can be built. The ADU Handout reflects the regulations permitted by new state law, effective January 1, 2020. Be advised that this information is subject to change, as state guidelines and interpretations are typically issued after the enactment of new law.  

OBTAINING A PERMIT

For ADU plans designed by a licensed professional or designer, please see Building’s Submittal Requirements for more information on what items need to be provided to obtain a permit.

FREE PERMIT-READY ADU PLANS

In August 2020, the Town launched its Permit-Ready Danville Garden Cottage Program to incentivize construction of quality ADUs that meet Danville’s design and neighborhood compatibility standards.  The program offers a selection of pre-approved, permit-ready ADU building plans that can be downloaded free-of-charge (detached units only).  Because these ADU plans have been pre-plan checked, they are eligible for expedited processing and lower building permit fees.  


Permit Ready Granny Units, Facilitating construction of quality accessory dwelling units in Danville

Permit-Ready Granny Unit Program Development Timeline

MonthActivity
January 2020Release RFP/Q for Design Services
February 2020Select Design Consultants
March - April 2020ADU Plans: Conceptual Design (through 35%)
May - July 2020ADU Plans: Working Drawings (through 90%)
Late August 2020Program Launch

 Sign up for updates on the Permit-Ready ADU Program

For more information on the status of the program’s development, contact Guillermo Santolaya at (925) 314-3352 or gsantolaya@danville.ca.gov 

  1. Example:
    Attached ADU
    Attached ADU
  1. Example:
    Detached ADU
    Detached ADU
  1. Example:
    Junior ADU
    Junior ADU