Skip to content

Facebook Instagram Youtube

ADU 101
Stories
Resources
Featured resources

Get Expert Advice

Contact the Resource Center

ADU Calculator

Estimate potential costs, fees, and rents.

Local ADU Rules

An overview of ADU rules in your location.

More resources

FAQs

Floorplans Inspiration

Glossary

Guidebook + Exercises

Pre-Designed Plans

Process-at-a-Glance

See the resources page
Events
About
Contact

Event type: Fair

ADU Fair

Fair

ADU Fair

October 11, 2026

Subscribe to the San Mateo County ADU Resource Center

* indicates required

Email Address *

/* real people should not fill this in and expect good things - do not remove this or risk form bot signups */

What are you looking for?

Search

ADU Process

Getting Started
Learning the Rules
Budgeting & Finance
Design
Permitting
Construction
Renting & Move-in

Getting Started
Learning the Rules
Budgeting & Finance
Design
Permitting
Construction
Renting & Move-in

Resources

Calculator
FAQs
Floorplans Inspiration
Glossary
Guidebook + Exercises
Local ADU Rules
Process-at-a-Glance
Pre-Designed Plans

Calculator
FAQs
Floorplans Inspiration
Glossary
Guidebook + Exercises
Local ADU Rules
Process-at-a-Glance
Pre-Designed Plans

Support

ADU 101
ADU Stories
News & Insights
Contact
About

ADU 101
ADU Stories
News & Insights
Contact
About

© 2026 21 Elements

Created by Community Planning Collaborative