ADU Regulations in Vallejo, California
Solano County · CA · Pop. 125,000
Max ADU Size
1,200
sq ft detached
Rear Setback
4 ft
Permit Timeline
60 days
Build Cost
$155,000 – $310,000
Zoning
Allowed ADU Types
State law preempts local owner-occupancy requirements. ADUs permitted on any lot with an existing or proposed single-family or multifamily residence in residential zones.
Source: City of Vallejo — Accessory Dwelling Units · Vallejo Municipal Code Title 16 (Zoning)
Dimensions
Size & Setback Requirements
Detached
1,200
sq ft max
JADU
500
sq ft max
Attached
50% of primary home, max 1,200 sq ft
Setbacks
front
Same as primary dwelling per underlying zone
side
4 ft
rear
4 ft
Max height: 16 ft
Lot coverage: Per underlying zone
Detached ADUs over 850 sq ft on lots under 10,000 sq ft must comply with lot coverage limits. Existing structures converted to ADUs are not subject to increased setback requirements.
Permitting
Permit Process
Department
Vallejo Community Development — Planning Division
Review Timeline
60 days
Permit Fees
$6,000 – $12,000
Impact Fees
Impact fees waived for ADUs under 750 sq ft; prorated for larger units
Required Documents
- ›Site plan with property dimensions and setbacks
- ›Floor plans
- ›Elevations
- ›Title 24 energy compliance report
- ›Structural drawings
- ›Grading and drainage plan (if applicable)
Vallejo offers an over-the-counter plan check for qualifying standard ADU designs. Ferry service proximity to San Francisco has increased ADU interest significantly since 2023.
Visit Vallejo Community Development — Planning Division →Infrastructure
Utilities & Requirements
Solar
Required
Parking
Not required
Separate Meter
Optional
Fire Sprinklers
See note
Financials
ADU Costs in Vallejo
Typical Build Cost
$155,000 – $310,000
Cost per Sq Ft
$215 – $275
Monthly Rental
$1,500 – $2,400/mo/mo
Property Value Added
Adds $120,000 – $220,000 to property value
Available Grants & Programs
- ★CalHFA ADU Grant Program available (up to $40,000)
- ★City of Vallejo may offer fee deferral programs — check with Planning Division
Ferry access to San Francisco makes Vallejo ADUs increasingly attractive to commuters priced out of the Bay Area. Rental demand is growing especially near the Vallejo Ferry Terminal.
Use the free ADU Cost Calculator →Free Service
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Vallejo Quick Facts
- Max size1,200 sq ft
- Rear setback4 ft
- Permit timeline60 days
- Build cost$155,000 – $310,000
- Rental income$1,500 – $2,400/mo/mo
- Owner occupancyNot required
Official Source
City of Vallejo — Accessory Dwelling UnitsVallejo Municipal Code Title 16 (Zoning)
Last verified: March 14, 2026
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ADU rules change often.
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