ADU permit process in Folsom, California
Sacramento County, California
Prepared by GetYourPermit editorial teamReport an error
We haven’t written Folsom’s permit guide yet.
We publish permit process guides one city at a time, and we would rather publish nothing than guess at Folsom’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 Folsom right now.
See the fee estimate for FolsomStart here instead — official and primary sources for Folsom
The live City fees page links the July 1, 2026 Community Development user fee schedule and both current impact-fee schedules.
Accessed August 29, 2026
The current City schedule lists dedicated detached/attached ADU and JADU fees, plan-review and processing rules, and additional City/State surcharge rows.
Accessed August 29, 2026
The current North-of-50 City schedule makes ADUs below 750 square feet $0 for the stated impact layer and requires a floor-area ratio calculation for ADUs over 750 square feet.
Accessed August 29, 2026
The current Folsom Plan Area schedule states the same ADU 750-square-foot zero/proportional treatment for its listed impact layers.
Accessed August 29, 2026
The live City ADU page establishes the municipal ADU route and links the application and plan-submittal resources.
Accessed August 29, 2026
What to ask the Folsom 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.