ADU Impact Fees: Bostonia vs San Diego
How do adu impact fees rules compare between Bostonia, CA and San Diego, CA?
Bostonia, CA
San Diego County
No data available yet for Bostonia.
San Diego, CA
San Diego County
San Diego exempts ADUs under 750 square feet from all impact fees per California Government Code § 65852.2(f). ADUs 750 sq ft or larger pay impact fees proportionate to the principal dwelling's square footage. Affordable ADUs deed-restricted for low/moderate-income tenants receive additional fee waivers. School fees are separately governed by SB 13 (2019) and state law.
View full San Diego rules →Key Facts Comparison
| Fact | Bostonia | San Diego |
|---|---|---|
| Under 750 sq ft | - | ALL impact fees waived (state law) |
| 750+ sq ft | - | Proportional to principal dwelling |
| State Law | - | Gov. Code § 65852.2(f) |
| Affordable Bonus | - | Additional waivers for deed-restricted ADUs |
| School Fees | - | Proportional under SB 13 |
Highlighted rows indicate differences between cities.
Bostonia FAQ
No FAQs available.
San Diego FAQ
Are ADU impact fees waived in San Diego?
Yes for ADUs under 750 sq ft — all local impact fees are waived by state law (Gov. Code § 65852.2(f)). ADUs 750 sq ft+ pay proportional fees, not full single-family rates.
How much can I save by building under 750 square feet?
Impact fees in San Diego typically total $10,000–$30,000 for a new single-family unit. Building under 750 sq ft eliminates this entirely. Permit fees, plan-check, and utility service fees still apply.
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