ADU Permits: Fairfield vs Vacaville
How do adu permits rules compare between Fairfield, CA and Vacaville, CA?
Fairfield and Vacaville have similar restriction levels.
Fairfield, CA
Solano County
Fairfield must approve or deny ADU permit applications ministerially within 60 days under Gov Code §65852.2. Applications go through the Fairfield BUILD portal with site plan, floor plan, elevations, and Title 24 documentation. Typical review is 4-8 weeks. No discretionary hearings allowed for code-compliant ADUs.
View full Fairfield rules →Vacaville, CA
Solano County
Vacaville processes ADU and JADU permits ministerially through the Community Development Department / Building Division under VMC 14.09.122 and California Government Code 66317. The city must act on a complete application within 60 days. Submittal is through the eTRAKiT online portal. Pre-approved ADU plans accelerate review under AB 434 (Gov. Code 66315).
View full Vacaville rules →Key Facts Comparison
| Fact | Fairfield | Vacaville |
|---|---|---|
| Review Deadline | 60 days (state law) | - |
| Process Type | Ministerial / by-right | - |
| Typical Timeline | 4-8 weeks plan review | - |
| Apply Online | Fairfield BUILD portal | - |
| School Fees | ADUs ≥500 sq ft only | - |
| Owner-Occupancy | Not required (ADU); required (JADU) | - |
| Code Authority | - | VMC 14.09.122; Gov. Code 66317 |
| Decision Window | - | 60 days from complete app |
| Review Type | - | Ministerial (no hearing) |
| Online Portal | - | eTRAKiT |
| Pre-Approved Plans | - | 30-day review (AB 434) |
Highlighted rows indicate differences between cities.
Fairfield FAQ
What happens if Fairfield doesn't approve my ADU permit within 60 days?
Under Gov Code §65852.2(b), an ADU application not acted upon within 60 days is deemed approved by operation of law if it complies with state standards. Send a written notice to the Building Official to invoke this remedy.
Do I need to live in my Fairfield ADU as the owner?
No, owner-occupancy is not required for ADUs (Gov Code §65852.2 was amended to remove that requirement through 2024). JADUs still require owner-occupancy of either the JADU or the main house.
Vacaville FAQ
How long does ADU permitting take in Vacaville?
California Government Code 66317 requires Vacaville to act on a complete application within 60 days. Actual project timelines depend on correction cycles - budget 3-6 months from initial submittal to final permit issuance through the eTRAKiT online portal. Pre-approved plans under AB 434 cut review to 30 days.
Will my Vacaville neighbors be notified about my ADU?
No. Government Code 66317(b) and VMC 14.09.122 make ADU review strictly ministerial - no public hearing, no Planning Commission action, no neighborhood notification, and no discretionary design review. The planner verifies compliance with objective standards only.
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