ADU permit cost and fee breakdown in Antioch, California
An early-budgeting estimate of the permit-related fees an accessory dwelling unit is likely to incur in Antioch. These are not official figures.
Prepared by GetYourPermit editorial teamReport an error
ADU size
California generally exempts ADUs under 750 sq ft from development impact fees, so the 749 / 750 / 751 steps are worth comparing.
Estimated total
Estimated total permit fees at 750 sq ft
$5,550 – $56,800
Assumed construction valuation
$270,000
Used only to compute valuation-based fees. It is not a construction quote.
Where the money goes
- Building permit$3,000 – $8,000
The core permit issued by the city building department.
- Plan check$1,000 – $3,500
Review of your drawings for code compliance.
- Impact fees$0 – $27,000
Development impact fees. Often waived for ADUs under 750 sq ft.
- School district fees$0 – $6,000
Developer fees charged by the local school district.
- Utility connection$1,500 – $12,000
Water, sewer, and electrical connection or capacity charges.
- Technology & surcharges$50 – $300
Records, technology, and general plan surcharges.
The darker segment is the low end of the range; the full bar is the high end.
Read before you budget
- Most fee lines are working estimates rather than verified published city rates. Confirm every line with the city before budgeting.
- Totals do not vary by ADU size for this city, so the size selector will not change the estimate.
Fee items
Building permit
The core permit issued by the city building department.
City department fees (plan check/building permit/inspection/admin)
$3,000 – $8,000
Estimated range
CITY OF ANTIOCH ACCESSORY DWELLING UNITS FAQS
Plan check
Review of your drawings for code compliance.
Plan Check Fee
$1,000 – $3,500
Estimated range
Impact fees
Development impact fees. Often waived for ADUs under 750 sq ft.
California ADU impact fee baseline
$0 – $15,000
Estimated range
CITY OF ANTIOCH ACCESSORY DWELLING UNITS FAQSDevelopment impact fees for ADUs
$0 – $12,000
Estimated range
CITY OF ANTIOCH ACCESSORY DWELLING UNITS FAQS
School district fees
Developer fees charged by the local school district.
Antioch Unified School District fee
$0 – $6,000
Estimated range
CITY OF ANTIOCH ACCESSORY DWELLING UNITS FAQS
Utility connection
Water, sewer, and electrical connection or capacity charges.
Utility Connection and Capacity Fees
$1,500 – $12,000
Estimated range
Technology & surcharges
Records, technology, and general plan surcharges.
Technology Surcharge
$50 – $300
Estimated range
These are estimates, not official fees
Use these figures for early budgeting only. They are not a quote, not a government fee determination, and not legal advice. Actual fees depend on your parcel, your plans, your construction valuation, your utility provider, and the fee schedule in force on the day your permit is issued. Confirm every number with Antioch before you commit money.
City reference pages for verification