ADU Rules: Hesperia vs San Bernardino
How do adu rules rules compare between Hesperia, CA and San Bernardino, CA?
Hesperia and San Bernardino 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 →San Bernardino, CA
San Bernardino County
San Bernardino permits ADUs on single-family and multi-family lots under CA Gov Code 65852.2. Detached ADUs up to 1,200 sq ft and JADUs up to 500 sq ft are ministerially approved.
View full San Bernardino rules →Key Facts Comparison
| Fact | Hesperia | San Bernardino |
|---|---|---|
| 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) | - |
| Legal authority | - | CA Gov Code 65852.2 statewide ADU mandate |
| Standard ADU | - | Up to 1,200 sq ft detached, 850 to 1,000 sq ft for attached |
| JADU | - | Up to 500 sq ft inside existing home with owner occupancy |
| Approval | - | Ministerial, 60-day review, no discretionary hearing |
| Parking | - | No parking required within 1/2 mile of transit |
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.
San Bernardino FAQ
Does San Bernardino approve ADUs over the counter?
Yes. State law requires ministerial approval within 60 days of a complete application, with no discretionary hearings or subjective design review.
Do I have to live on the property to rent my ADU?
Owner occupancy is required for Junior ADUs. Standard ADUs permitted after 2020 are not subject to owner-occupancy rules until state law changes.
Can I rent my ADU on Airbnb?
State law generally requires ADU rentals be 30 days or longer, so short-term rental use is typically prohibited.
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