Skip to content
Skip to content
Facebook Instagram Youtube
Logo for ADU Resource Center San Mateo County
  • 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
    • FAQs
    • Floorplans Inspiration
    • Glossary
    • Guidebook + Exercises
    • Pre-Designed Plans
    • Process-at-a-Glance
    See the resources page
  • Events
  • About
  • Contact
  • Getting Started
  • Learning the Rules
  • Budgeting
  • Design
  • Permitting
  • Construction
  • Renting
  • Getting Started
  • Learning the Rules
  • Budgeting
  • Design
  • Permitting
  • Construction
  • Renting

Archives: FAQs

Can an ADU or JADU be used as a short-term/vacation rental?

What do I need to know about becoming a landlord?

When is my ADU ready for move-in?

What are my responsibilities during construction?

How long does construction take?

How much does construction cost?

How do I find a contractor?

Can my ADU be stopped because of other noncompliance issues on my property?

Are there water and sewer issues I should consider?

How much does it cost to get permits for an ADU?

Next →

Subscribe to the San Mateo County ADU Resource Center

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

Intuit Mailchimp

Contact Us

What are you looking for?

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
  • Contact
  • About
  • ADU 101
  • ADU Stories
  • Contact
  • About
© 2026 21 Elements

Created by Community Planning Collaborative

Spanish Chinese (Simplified) Chinese (Traditional) Hindi Tagalog Japanese Vietnamese Russian Arabic
English