Antioch, CA · Contra Costa County
ADU Application
Antioch property owners use this application to provide project details when applying for a building permit for an accessory dwelling unit.
What this form is
This application collects property and owner details and information about the proposed accessory dwelling unit, including its type and size. Submit it with a building permit application; a separate ADU Permit Form is generally required for completely new construction on a single-family lot when the ADU is over 800 square feet. The packet also lists project plan requirements and review steps.
Who needs it
Property owners proposing an accessory dwelling unit in Antioch need this application as part of a building permit submission.
How to submit it
Submit the building permit application online through the Civic Access Online Portal linked in the document. The Building Division will issue an invoice for plan check fees after receiving the application.
About notarization
This document is signed and dated by the applicant without a notary; the ADU Permit Form also asks for an applicant signature and date, with no sworn or notarized attachment stated.
How to submit this form
- 1
Download The Application
Download the ADU Application and review the application process and project plan requirements.
- 2
Complete The Form
Provide the property address, APN, owner contact details, property type, proposed ADU details, and requested unit information.
- 3
Gather Project Documents
Prepare the project plans listed in the packet. Complete the ADU Permit Form when required for qualifying new construction.
- 4
Submit Online
Submit the building permit application through the Civic Access Online Portal linked in the document.
Frequently asked questions
- What is the Antioch ADU Application for?
- It collects owner, property, and proposed ADU details for a building permit application, including the ADU type and size.
- Who needs to complete the ADU Application?
- Property owners proposing an accessory dwelling unit in Antioch use this application as part of their building permit submission.
- How do I submit the ADU Application?
- Submit the building permit application online through the Civic Access Online Portal linked in the document. The Building Division issues a plan check fee invoice after receiving it.
- Do I need a notary for the ADU Application?
- No. The application is signed and dated by the applicant without a notary. The ADU Permit Form also asks for an applicant signature and date; no sworn or notarized attachment is stated.