Perris, CA Accessory Structures: ADU Rules (2026)
ADU rules in Perris, CA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Minimum lot area
- none required
- Detached ADU height cap
- 16-18 feet
- Attached ADU height cap
- 25 feet
- Side/rear setback
- 4 feet minimum
- Approval type
- ministerial, no hearing
Summary
Perris allows an ADU on any lot with an existing home, with no minimum lot area required, capping detached units at 16-18 feet and requiring at least four-foot side and rear setbacks.
(1)Minimum lot area. There shall be no minimum lot area required to establish an ADU and/or JADU.(2)Building height.a.Single Family Detached ADU. Shall not exceed 16 feet above grade, unless the property is within ½ mile walking distance of a major transit stop or a high-quality transit corridor, in which case the Detached ADU shall not exceed 18 feet above grade.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 13).
Full Breakdown
PMC Chapter 19.81 sets Perris's local ADU zoning standards: no minimum lot area is required to establish an ADU or JADU, detached single-family ADUs are capped at 16 feet above grade (18 feet within a half-mile of a major transit stop), attached ADUs at 25 feet or the underlying zone's height limit, and side/rear setbacks are a minimum of four feet or the underlying zone requirement, whichever is less. ADUs receive ministerial, staff-level approval under §19.81.040 rather than discretionary review. Because California's state ADU law (Gov. Code §§66310 et seq., formerly §65852.2) preempts conflicting local restrictions, any Perris standard stricter than the state statute does not apply where the two conflict.
Violations & Fines
An ADU that does not meet the chapter's zoning and development standards can be denied ministerial approval; building without a permit is a zoning violation under Ch. 19.78, punishable as an infraction.
Frequently Asked Questions
Does Perris require a minimum lot size for an ADU?
Can Perris deny my ADU for discretionary reasons?
Sources & Official References
Other rules in Perris
How Perris compares: Easiest Cities to Build an ADU·California rules heatmap·Compare Perris to another location·View the California accessory structures overview
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ADU Rules in Nearby Cities
How other cities in Riverside County handle adu rules.