As of October 2026, the City of Bakersfield's ADU materials put a typical project at about one to two years from first idea to move-in. Planning and permitting take a few months each, and construction takes most of the rest. Interior conversions are usually the fastest; a large new detached unit takes the longest.
What are the stages and how long does each take?
| Stage | What the city's materials say, as of October 2026 | What moves it |
|---|---|---|
| Research and design | About 1 month of research, then 1 to 3 months of design (2024 resource guide) | Speed of decisions; using a standard or pre-reviewed plan |
| Planning review | 30 working days (city ADU page) | A complete site development plan |
| Building permit | Part of 1 to 6 months of total permitting (2024 resource guide) | Plan-check comments and resubmittals |
| Construction | 6 to 12 months (FAQ); the city's how-to page says 12 to 18 months is common | Size, scope, funding and inspection scheduling |
The city's own documents give different construction ranges, which is a fair reflection of how much projects vary. Conversions of interior space generally sit at the short end.
What deadlines does state law set?
As of October 2026, the agency must decide within 15 business days whether an ADU application is complete, and approve or deny a complete application within 60 days when a home already exists on the lot. That limit covers the agency's review, not design time or the time spent answering corrections.
How long is a Bakersfield permit valid?
The city's ADU page says a permit stays valid for one year, so construction needs to be funded and ready to start. The city's guidance recommends confirming funding before you build.
What can make a project faster?
- Starting from a pre-reviewed plan in the city's ADU Standard Plans Gallery, or a Kern County pre-approved plan for county parcels.
- Meeting a city planner early with a simple site sketch, which the city suggests as a step.
- Choosing finishes before submittal so the drawings do not change later.
- Staying within the standard size and height limits to avoid a Special Permit.
What tends to slow things down?
- A unit above a garage, which needs a longer Design Review Approval.
- Utility questions, such as a new water connection or septic review on a county parcel.
- Correction rounds from incomplete drawings.
- Summer heat limiting work hours on some tasks.
Sources, as of October 2026:
- City of Bakersfield Planning Division, ADU and JADU how-to page (undated, accessed October 2026).
- City of Bakersfield ADU program, ADU frequently asked questions (bakersfieldadu.us; undated, accessed October 2026).
- ADU Idea Book: Resource Guide for Accessory Dwelling Units, prepared for the City of Bakersfield (February 15, 2024).
- California Department of Housing and Community Development, ADU Handbook (updated March 2026, with addendum on law effective January 1, 2026), hcd.ca.gov.