Fontana exempts ADUs under 750 square feet from all impact fees per California Government Code §65852.2(f)(3). ADUs 750 sq ft or larger pay impact fees proportionate to the principal dwelling's square footage. School district fees are governed by SB 13 (2019). Standard building permit and plan-check fees still apply through the Building & Safety Division fee schedule.
Under California Government Code §65852.2(f)(3) — added by AB 881 / SB 13 in 2019 — ADUs under 750 sq ft are exempt from local impact fees including water and sewer capacity fees, public facilities fees, parks fees, and transportation impact fees. Fontana implements this exemption through its Building & Safety fee schedule. ADUs 750 sq ft or larger pay impact fees proportional to the principal dwelling's gross floor area, not the full single-family rate. School fees (collected by the Fontana Unified School District) follow the proportional formula under Gov. Code §65852.2(f)(2) and Education Code §17620. Water and sewer service in Fontana is provided primarily by the Fontana Water Company (a subsidiary of San Gabriel Valley Water Company) and the Inland Empire Utilities Agency / Cucamonga Valley Water District depending on service area, so utility tap fees vary by provider. ADUs that share existing service with the principal dwelling typically avoid new meter capacity fees. Building permit fees themselves are not waived — they are based on construction valuation. The Affordable Housing Linkage Fee (where applicable) does not apply to ADUs because state law preempts that fee on accessory dwellings.
Misrepresenting ADU square footage to claim the under-750 exemption is permit fraud and can void the Certificate of Occupancy under FMC Chapter 14. Failure to pay required permit fees results in permit denial. Water and sewer providers may refuse service connections without paid capacity fees where applicable.
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