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ADUs

Click the dropdowns below for curated resource collections and scroll down to browse and filter the entire library of related documents. 

The ADU Resource Center supports jurisdictions in meeting their ADU production and equity goals. The Center serves all San Mateo County residents, although some services are limited to residents of jurisdictions that fund the Center. You can see the full archive of pre-launch materials here.

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COMING SOON:

  • Summaries of ADU laws
  • Sample ADU ordinances
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  • Casita Coalition – Nonprofit advocating for more permissive ADU laws as well as a resource for pro-ADU practices
  • Napa Sonoma ADU Center – Nonprofit supporting homeowners to build ADUs in Napa and Sonoma counties 
  • EPA Can Do – Nonprofit increasing the number of affordable ADUs in East Palo Alto
  • City Systems – Nonprofit affiliated with Stanford developing plug-in garage ADU solutions
  • Free ADU Plans – HEART offers several free ADU plans
  • ADU Accelerator lists ADU tools and services developed by Community Planning Collaborative

All Related Documents

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Laws

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TitleLinkSummaryDateFile PurposeFile Type
1.30.25 New Housing Laws Training Recording

Recording from the January 2025 Planning Commissioners Training on New Housing Laws featuring a deep dive into HAA/Builder’s Remedy and AB 1893, new ADU laws (SB 1211, AB 2533), and SB 9 and SB 450. Please note that this recording has been compressed, and the final five minute discussion has been cut out due to audio …

January 30, 2025Meeting Materials, Presentationmp4
HCD ADU Handbook Update 2025

HCD’s ADU Handbook, updated January …

January 30, 2025Handout/Flyer, Meeting Materials, Toolkitpdf
1.30.25 New Laws Training Slides

Slides from the January 2025 Planning Commissioners Training on New Housing Laws featuring a deep dive into HAA/Builder’s Remedy and AB 1893, new ADU laws (SB 1211, AB 2533), and SB 9 and SB …

January 30, 2025Meeting Materials, Presentationpdf
Annual ADU Affordability Monitoring

ABAG is coordinating an opt-in survey for jurisdictions that want to monitor ADU …

July 2, 2024www
Memorandum Funding an ADU Resource Center

Memo that describes the ADU Resource Center and jurisdiction funding …

February 23, 2024Memopdf
ADU Amnesty Best Practices Memo

Guidance memo for jurisdictions considering implementing ADU Amnesty programs or complying with SB 897 (developed for OCCOG by Community Planning …

November 14, 2023Memodocx
ADU Model Ordinance

Sample ADU Accessory Dwelling Unit Ordinance (developed for OCCOG by Goldfarb and …

October 4, 2023Model Ordinancedocx
ADU Affordability Best Practices Memo

Memo on best practices (developed for OCCOG by Community Planning …

September 22, 2023Memodocx
HCD ADU Counts According to APRs

HCD data on ADU counts in each San Mateo County …

March 1, 2022Data/Researchxlsx
DRAFT ADU Affordability Report

ABAG memo on how to count ADUs for Housing Elements and Annual Progress Reports (APRs). It is the basis for the 30/30/30/10 affordability …

September 8, 2021Staff Reportpdf
UC Berkeley Affordability Study – Implementing the Backyard Revolution

UC Berkeley conducted this study in 2021 to determine ADU affordability. Authors: Karen Chapple, Ph.D., Dori Ganetsos, and Emmanuel …

April 22, 2021Data/Researchpdf
Marin County ADU Amnesty Prog Summary

Summary of Marin’s ADU Amnesty Program prepared for the 11/17/2016 TAC 21 Elements …

March 9, 2017Meeting Materialspdf
Ventura ADU Amnesty Prog Summary

Summary of Venturas’s ADU Amnesty Program prepared for the 11/17/2016 TAC 21 Elements …

November 17, 2016Meeting Materialspdf