ADU Rules: Hesperia vs Rancho Cucamonga
How do adu rules rules compare between Hesperia, CA and Rancho Cucamonga, CA?
Hesperia and Rancho Cucamonga have similar restriction levels.
Hesperia, CA
San Bernardino County
Hesperia permits one ADU plus one JADU per single-family lot under HMC 16.12.360 (Article 16.16 for JADUs), with detached ADUs up to 1,200 sq ft, JADUs up to 500 sq ft, and 4-foot side/rear setbacks - implementing California Gov. Code 66314 et seq.
View full Hesperia rules →Rancho Cucamonga, CA
San Bernardino County
Rancho Cucamonga must permit ADUs and JADUs on residential parcels under CA Gov Code 65852.2. Up to 1,200 sq ft detached or 50 percent of primary for attached, no owner-occupancy required statewide.
View full Rancho Cucamonga rules →Key Facts Comparison
| Fact | Hesperia | Rancho Cucamonga |
|---|---|---|
| Code Section | HMC 16.12.360 (ADU); Article 16.16 (JADU) | - |
| Max Detached ADU | 1,200 sq ft | - |
| Max Attached ADU | 50% of primary, up to 1,000 sq ft | - |
| Max JADU Size | 500 sq ft | - |
| Side/Rear Setback | 4 feet | - |
| Max Detached Height | 16 ft (18/25 ft per state law in qualifying cases) | - |
| State authority | - | Gov Code 65852.2, mandatory statewide |
| Detached ADU max | - | 1,200 sq ft, 16 ft height by right |
| Attached ADU max | - | 1,000 sq ft or 50 percent of primary |
| JADU | - | Up to 500 sq ft carved from primary dwelling |
| Owner occupancy | - | Not required for state-law ADUs |
Highlighted rows indicate differences between cities.
Hesperia FAQ
Can I build an ADU on my single-family lot in Hesperia?
Yes. HMC 16.12.360 permits one ADU plus one JADU on every single-family residential lot, with detached ADUs allowed up to 1,200 sq ft and JADUs up to 500 sq ft.
What setbacks apply to a detached ADU in Hesperia?
Side and rear setbacks are 4 feet under HMC 16.12.360. Front setbacks match the underlying zoning district. Conversion ADUs and JADUs only need sufficient fire-safety separation.
Rancho Cucamonga FAQ
Do I need to live in the main house to build an ADU in Rancho Cucamonga?
No. State law eliminated owner-occupancy requirements for ADUs permitted under Gov Code 65852.2. JADUs still require owner occupancy of the primary or JADU.
Can I rent my Rancho Cucamonga ADU as a short-term rental?
State law requires ADUs to be rented for 30+ days. Short-term rental of an ADU is generally prohibited under Rancho Cucamongas STR rules and the ADU law.
How long does permitting take?
State law requires ministerial approval within 60 days of a complete application. Preapproved plans can reduce plan-check time significantly.
Compare other topics
See how Hesperia and Rancho Cucamonga compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool