Sacramento County · California
Folsom ADU guide: local rules, permits & property planning
Folsom’s ePermit instructions distinguish ADUs above 800 square feet and direct applicants to complete an ADU checklist first. The City also offers a Master Plan program for reusable designs.
Local planning guide · Reviewed October 2, 2026
What matters for an ADU in Folsom
Permitting authority: City of Folsom — ADUs
Official local guidanceLocal rules and design checks
| Topic | Local guidance |
|---|---|
| Application routing | The ePermit page says larger ADUs over 800 square feet require Planning Design Review approval before the building submission; confirm the current objective-review path for your proposal. |
| Checklist | Complete Folsom’s ADU Application Checklist before submitting. |
| Rental use | The City’s vacation-rental guidance prohibits ADUs as vacation rentals. |
Selected local requirements, not a complete zoning determination. Confirm the current rules for your address with the responsible agency.
Fees and budget checks
Use Folsom’s dedicated Planning, Permit, Plan Check and Impact fee resource. Ask for the charges associated with the selected ADU size and any Master Plan reuse, plus separate utility assessments.
Folsom development fee schedulesHow to start the permit process
Establish the Planning approval needed for the design, complete the ADU checklist and apply through eTRAKiT. Follow the City’s electronic plan-review instructions for drawings and correction responses.
Plan resource
Folsom ADU Master Plan program
The City provides a Master Plan pathway for designs reviewed for reuse. Confirm the current plan inventory and property-specific requirements before choosing a design.
View the original sourceFolsom ADU questions
- Should I submit a 900-square-foot plan directly to Building?
- Folsom’s portal guidance calls for Planning Design Review first for ADUs over 800 square feet. Confirm the applicable path with the City.
- Can the ADU become a vacation rental?
- Folsom’s vacation-rental page specifically prohibits that use for ADUs.
Sources for this guide
- City of Folsom — ADUs
- Folsom development fee schedules
- Folsom ADU Master Plan program
- Folsom ePermit Center
- Folsom vacation-rental restrictions
Local sources reviewed October 2, 2026. Historical examples retain their stated dates. Contact ADU California to confirm project availability; this guide does not establish an office location or property approval.
A useful first review
Separate what is available from what still needs verification.
01
Confirm the property
Start with a complete address and review the available parcel, building, and map context.
02
Identify the unknowns
Keep missing setbacks, easements, utilities, access, hazards, and local requirements visible.
03
Choose the next review
Use the preliminary result to prepare a focused conversation with the required professionals and agencies.
Explore project types
Compare the scope before choosing a solution.
These pages explain the questions each project type introduces. They do not assert that a particular scope is permitted or suitable for your address.
Compare planning footprints
See common ADU sizes before choosing a design.
These model pages are planning references only. They are not a statement that a particular size is allowed or buildable at a Folsom address.
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The next useful action
Put your address at the center of the conversation.
The online review is preliminary and is not a permit decision, survey, engineering opinion, construction document, final price, or guaranteed schedule.