ADU Rules: Herald vs Isleton
How do adu rules rules compare between Herald, CA and Isleton, CA?
Herald has fewer restrictions than Isleton.
Herald, CA
Sacramento County
Herald is an unincorporated CDP in Sacramento County governed by Sacramento County Zoning Code §5.4.5 (Accessory Dwelling Units), not a city ordinance. The County allows one ADU plus one JADU on single-family lots. Most Herald parcels are in agricultural-residential (AR) zones where ADUs are permitted ministerially.
View full Herald rules →Isleton, CA
Sacramento County
California state ADU law (Gov Code 65852.2) overrides most local rules. Isleton must allow up to 800 sq ft detached ADUs with 4-foot setbacks. Delta flood zone adds FEMA elevation requirements.
View full Isleton rules →Key Facts Comparison
| Fact | Herald | Isleton |
|---|---|---|
| Governing Code | Sac County Zoning Code §5.4.5 | - |
| Max Detached | 1,200 sq ft | - |
| Height (detached) | 16 ft (limited transit area) | - |
| Setback (side/rear) | 4 ft (new construction) | - |
| Septic/Well | Sac EMD review required | - |
| Detached ADU | - | Up to 800 sq ft by right |
| Setbacks | - | 4 feet side and rear |
| Processing | - | 60 days maximum |
| Flood | - | FEMA BFE plus 1 foot |
| State Law | - | Gov Code 65852.2 |
Highlighted rows indicate differences between cities.
Herald FAQ
Who regulates ADUs in Herald?
Herald is unincorporated, so Sacramento County Planning regulates ADUs under Sacramento County Zoning Code §5.4.5, not a separate city ordinance.
Do I need septic and well approvals for a Herald ADU?
Yes for rural parcels not on municipal sewer/water. Sacramento County Environmental Management Department reviews septic-system capacity and well water before issuing the ADU building permit.
Can I rent my Herald ADU as a short-term rental?
No. State ADU law and a recorded deed restriction prohibit short-term rental of ADUs built on or after January 1, 2020 in unincorporated Sacramento County.
Isleton FAQ
Can Isleton deny my ADU permit?
Not for meeting state minimums. The city must permit an ADU that meets the state law standards within 60 days.
How does flooding affect ADU construction?
Isleton is in FEMA Zone AE. Living space must be elevated to base flood elevation plus 1 foot, or the structure must be flood-resistant.
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