ADU permit process in Larkspur, California
Marin County, California
Prepared by GetYourPermit editorial teamReport an error
We haven’t written Larkspur’s permit guide yet.
We publish permit process guides one city at a time, and we would rather publish nothing than guess at Larkspur’s rules using another city’s process. Permit steps, submittal requirements, and review timelines are set locally, so a guide copied from a neighboring city would be wrong in ways that cost you time.
Here is what is useful for Larkspur right now.
See the fee estimate for LarkspurStart here instead — official and primary sources for Larkspur
The current City schedule supplies FY2026-27 valuation, plan-review, ADU preapproval, and Road Impact rules.
Accessed August 28, 2026
The current City ADU page identifies the Building Permit route and states pre-approved plans still need site-specific planning and permitting.
Accessed August 28, 2026
What to ask the Larkspur building department
- The current building permit fee schedule, and the date it took effect.
- Whether development impact fees apply at your square footage — many California cities waive them for ADUs of 750 sq ft or less.
- Plan submittal requirements: what drawings they expect, in what format, and whether submittal is online or in person.