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California ADU Permit Fees & Cost Calculator
California ADU rules create statewide fee protections, but city permit fees, plan check charges, school fees, and utility costs still vary by jurisdiction and project scope.
Start statewide calculatorStatewide fee notes
ADUs at or below 750 sq ft are generally protected from development impact fees under California ADU law.
JADUs at or below 500 sq ft may be exempt from certain impact fees.
Larger ADUs may face proportional impact fees, and school or utility fees can still require local verification.
Los Angeles
Los Angeles County
Los Angeles homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
San Diego
San Diego County
San Diego homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
San Jose
Santa Clara County
San Jose homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
San Francisco
San Francisco County
San Francisco homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Palo Alto
Santa Clara County
Palo Alto homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Oakland
Alameda County
Oakland homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Sacramento
Sacramento County
Sacramento homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Long Beach
Los Angeles County
Long Beach homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Irvine
Orange County
Irvine homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Mountain View
Santa Clara County
Mountain View homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Sunnyvale
Santa Clara County
Sunnyvale homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Santa Clara
Santa Clara County
Santa Clara homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Fremont
Alameda County
Fremont homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
San Mateo
San Mateo County
San Mateo homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.
Redwood City
San Mateo County
Redwood City homeowners can use this planning calculator to estimate ADU permit fees, plan check charges, impact fee exposure, school fees, utility costs, and other pre-development costs before speaking with the city or a design professional.