Modesto ADU Permit Fees & Cost Calculator
Modesto has a city ADU permitting page, but the clearest fee estimate available in the provided sources is a Stanislaus County ADU building-fee estimate used for Modesto-area applications. California’s ADU impact-fee rule applies: ADUs under 750 square feet are exempt from impact fees, while larger ADUs may owe proportionate fees.
Free ADU fee calculator
Estimate local ADU fees
Step 1 of 5: Location
The calculator uses staged city data from the ADUFee database with visible confidence levels and dated source tracking.
Fee overview
The county PDF excerpt does not show the full numeric fee schedule in the search result text, so exact permit fee amounts could not be safely entered.
Utility connection charges, school district fees, and any city-specific technology or plan-check charges were not clearly published in the provided sources and should be verified separately before budgeting.
Modesto ADU applicants may still rely on county fee estimation materials for at least part of the permit process, but city-specific final fees should be verified directly.
The provided sources do not expose a complete published Modesto fee table, so exact numeric permit and connection charges are left null unless explicitly supported.
Modesto fee estimates should be verified against the current city, utility, and school district fee schedules before filing.
This page uses the latest staged fee research from the ADUFee database.
FAQs
Are Modesto ADU fee estimates official?
No. ADUFee.com provides planning estimates only. Final fees are set by the city, utility providers, school district, and other agencies.
What sources are used for Modesto?
The database stores city, state, utility, school, county, and other source links where available. Each estimate should still be verified locally.
Can ADU fees vary within California?
Yes. Permit, utility, school, inspection, and impact fees can vary by jurisdiction, parcel, project size, utility provider, and local interpretation.