Structure Height Limits: Fremont vs Sunol
How do structure height limits rules compare between Fremont, CA and Sunol, CA?
Sunol has fewer restrictions than Fremont.
Fremont, CA
Alameda County
Fremont limits single-family homes to 30 feet or 2 stories in most R-1 zones, with hillside overlay districts imposing stricter limits to protect ridgelines.
View full Fremont rules →Sunol, CA
Alameda County
Alameda County limits residential structure heights to 30-35 feet in most R-1 zones under Title 17, with stricter limits in hillside overlays. ADUs are capped at 16-18 feet per state law.
View full Sunol rules →Key Facts Comparison
| Fact | Fremont | Sunol |
|---|---|---|
| R-1 Height | 30 feet / 2 stories | - |
| Accessory | 15 feet | - |
| ADU Height | 25 feet (state law) | - |
| Hillside | Stricter overlay limits | - |
| Contact | (510) 494-4455 | - |
| R-1 height limit | - | 30 feet / 2.5 stories typical |
| Hillside zones | - | Often 25 feet maximum |
| Detached ADU | - | 16 feet (state law) |
| Measured from | - | Average natural grade |
| Rooftop equipment | - | May exceed with conditions |
Highlighted rows indicate differences between cities.
Fremont FAQ
Can I build a three-story home?
Not in standard R-1 zones; multi-family or specific plan areas may allow 3 stories with design review.
Do hillside rules apply to my lot?
Check the Fremont Hillside Combining District map; lots in the overlay have ridgeline and height protections.
Sunol FAQ
Does a basement count toward height?
Generally no if it is below average natural grade, but a daylight basement that extends above grade on downslope sides may count as a story depending on exposure.
Can I add a second story to my Castro Valley home?
Yes if the finished structure stays within the zone height limit and does not violate hillside overlay restrictions. A building permit and often design review are required.
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