ADU Impact Fees: Fairfield vs Vallejo
How do adu impact fees rules compare between Fairfield, CA and Vallejo, CA?
Fairfield, CA
Solano County
ADUs under 750 sq ft are exempt from all city development impact fees in Fairfield under California Gov Code §65852.2(f)(3). ADUs 750 sq ft and larger pay impact fees proportional to the primary dwelling, capped at the ratio of the ADU's square footage to the primary's square footage.
View full Fairfield rules →Vallejo, CA
Solano County
No data available yet for Vallejo.
Key Facts Comparison
| Fact | Fairfield | Vallejo |
|---|---|---|
| Under 750 sq ft | No impact fees | - |
| 750+ sq ft | Proportional to primary | - |
| School Fees | ADUs ≥500 sq ft only | - |
| Permit/Plan Check | Still applies (not impact) | - |
| Legal Basis | Gov §65852.2(f)(3) | - |
| Plan-Check Range | ~$1,500-$7,500 typical | - |
Highlighted rows indicate differences between cities.
Fairfield FAQ
Is the water connection fee waived for a small ADU in Fairfield?
If the ADU shares the primary residence's existing water connection, no new connection fee can be charged. A new separate connection (rare for ADUs under 750 sq ft) would trigger the standard hookup charge from the relevant water utility.
Do I have to pay the Fairfield-Suisun school district fee for my 600 sq ft ADU?
No. School impact fees apply only to ADUs 500 sq ft or larger by state law, but Fairfield's practice and many ADU advocates note that even ADUs above 500 sq ft are sometimes waived; confirm with the school district facilities office before paying.
Vallejo FAQ
No FAQs available.
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