ADU permit process in Lancaster, California
Last verified August 29, 2026
Prepared by GetYourPermit editorial teamReport an error
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 & Safety Permitting Division
- Permit portal
- City Online Portal System
Step by step
- 1
Prepare ADU application and digital plans
Complete City ADU Application Prepare City-required digital plan set Use Accela process for ADU application Submitted ADU application
- 2
City plan check of submitted ADU plans
Provide any additional information City requires after review Plan-check review
- 3
Obtain Building & Safety permit and approval
Meet City conditions communicated through the permit process Building Permit and approval
What you need to submit
- City ADU Application
- Digital ADU plan set
Pre-approved ADU plans
Use Lancaster’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 plansProject-specific next step
Build your Lancaster permit report
Choose your ADU type and size to bring the City process, researched permit fees, and early construction budget into one planning report.
Sources for this guide
Additional city reference pages
The official Building and Safety page identifies and directly links the Building Fee Schedule and Citywide Fee Schedule effective October 1, 2025, together with ADU submittal documents.
Accessed August 28, 2026
The current official schedule uses base costs at square-foot thresholds and incremental costs per additional 100 square feet for plan check and inspection columns; the table has no dedicated ADU row.
Accessed August 28, 2026