ADU Rules: Fontana vs Hesperia
How do adu rules rules compare between Fontana, CA and Hesperia, CA?
Fontana and Hesperia have similar restriction levels.
Fontana, CA
San Bernardino County
Fontana permits ADUs and JADUs under California Gov Code 65852.2. Ministerial approval within 60 days, no replacement parking for garage conversions, and detached ADUs up to 1,200 sq ft.
View full Fontana rules →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 →Key Facts Comparison
| Fact | Fontana | Hesperia |
|---|---|---|
| Approval timeline | 60 days ministerial per GC 65852.2 | - |
| Max detached ADU | 1,200 sq ft or 1,000 sq ft by bedroom count | - |
| Parking rule | No added parking, no replacement for converted garage | - |
| Setbacks | 4 feet side and rear for new detached ADU | - |
| Impact fees | Waived for ADUs under 750 sq ft | - |
| 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) |
Highlighted rows indicate differences between cities.
Fontana FAQ
Can I build an ADU on my Fontana single-family lot?
Yes. State law and Fontana Municipal Code allow one ADU plus one JADU on every single-family lot, subject to size, setback, and height limits.
Do I lose my garage parking if I convert it to an ADU?
You can convert the garage without providing replacement parking under state ADU law - the city cannot require a new covered space.
How long does ADU approval take in Fontana?
Complete applications must receive a ministerial decision within 60 days under Government Code 65852.2.
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.
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