GetYourPermit

ADU permit process in Thousand Oaks, California

Last verified August 29, 2026

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This guide includes the portions of the City permit process that passed our evidence review. Confirm project-specific requirements with the City before submitting.

Where to apply

Department
Building Division
Permit portal
City Online Portal System
Contact
805-449-2320building@toaks.gov

Step by step

  1. 1

    Prepare and submit digital ADU Building application

    Use City ADU application/checklist resources Upload digital plans through TO/24 Building application

  2. 2

    Building Division completes preliminary completeness review

    Add marked required items and resubmit when incomplete Complete or incomplete application result

  3. 3

    City conducts detailed code-compliance review

    Address City review comments through TO/24 as requested Detailed code-compliance review result

  4. 4

    Schedule inspections through TO/24 after permit issuance

    Use TO/24 to schedule inspections when eligible Inspection scheduling and status

What you need to submit

  • Complete ADU project plan set in a single PDF
  • Site plan with property, proposed/existing building, utility and easement information
  • Fire Flow Verification and Fire District Conditions 610B form — only in some cases

Pre-approved ADU plans

Use Thousand Oaks’s official page to confirm which designs, site conditions, and supplemental documents qualify. Plan-check timing still depends on the project and city review.

View pre-approved plans

Project-specific next step

Build your Thousand Oaks permit report

Choose your ADU type and size to bring the City process, researched permit fees, and early construction budget into one planning report.

Start my permit report

Sources for this guide

Additional city reference pages