ADU Impact Fees: Castro Valley vs Fremont
How do adu impact fees rules compare between Castro Valley, CA and Fremont, CA?
Castro Valley, CA
Alameda County
No data available yet for Castro Valley.
Fremont, CA
Alameda County
Under California Government Code 65852.2(f)(3) and FMC 18.190.005, Fremont ADUs under 750 square feet are exempt from all city impact fees. ADUs 750 square feet or larger pay impact fees proportional to the primary dwelling's size. Standard building permit and plan-check fees still apply at any size.
View full Fremont rules →Key Facts Comparison
| Fact | Castro Valley | Fremont |
|---|---|---|
| Authority | - | Gov. Code 65852.2(f)(3) |
| Sub-750 sq ft ADU | - | Exempt from all city impact fees |
| 750+ sq ft ADU | - | Proportional impact fees |
| Permit/Plan Check | - | ~$4,000-$9,000 (any size) |
| School Fees | - | Waived under 750 sq ft |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
No FAQs available.
Fremont FAQ
Are Fremont ADUs charged impact fees?
ADUs under 750 sq ft are exempt from all city impact fees under California Government Code 65852.2(f)(3). This includes Capital Facilities, Park, Traffic Impact, and Fremont Unified School District fees. ADUs 750 sq ft and larger pay proportional fees based on size relative to the primary dwelling.
What does a Fremont ADU cost to permit?
Permit and plan-check fees typically run $4,000-$9,000 for a detached ADU, based on valuation per Fremont's Master Fee Schedule. Sub-750 sq ft ADUs are exempt from impact fees but still pay these permit fees plus utility connections.
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