Hayward, CA Accessory Structures: ADU Impact Fees (2026)
Key Facts
- ADU fee status
- Exempt from Traffic Impact Fee
- Governing section
- HMC Sec. 10-30.15(h)
- Fee basis (non-exempt units)
- Per dwelling unit, Master Fee Schedule
- Fee due date (if owed)
- Before final inspection/occupancy
- Appeal window
- 15 days of fee determination
Summary
Hayward's Traffic Impact Fee, otherwise charged on every new dwelling unit, does not apply to accessory dwelling units. Section 10-30.15(h) exempts ADUs outright, so homeowners adding a backyard unit skip the citywide traffic mitigation charge that new houses and condos pay.
The following types of development projects(s) shall be exempt from the provisions of this article: ... (h)No fee is applicable for remodeling, adding to an existing unit, or adding an accessory dwelling unit (ADU) for residential development.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 28 Update 1 | Charter: Supplement 1).
Full Breakdown
Hayward's Traffic Impact Fee (TIF), created by Ordinance 22-05 on May 24, 2022 under the Mitigation Fee Act (Gov. Code Sec. ), is normally charged per new dwelling unit for residential development and per thousand square feet of new floor area for non-residential development (Sec. 10). 15 lists categorical exemptions from that fee, including affordable housing restricted under the Hayward Affordable Housing Ordinance, public buildings, and projects where the fee would violate state or federal law. Subsection (h) adds accessory dwelling units to that list by name: no TIF applies to remodeling, additions to an existing unit, or adding an ADU to a residential property.
Where the fee does apply to a qualifying project, it is set by City Council resolution in the Master Fee Schedule based on the March 2022 Multimodal Intersection Improvement Plan & Nexus Study, adjusted annually by the California Construction Cost Index for the Bay Area (Sec. 20), and is due to the Public Works Transportation Division before final inspection or certificate of occupancy (Sec. 30). A developer who disagrees with how a fee was calculated on a covered project can appeal to the City Manager, or to the City Council if the underlying decision came from the Planning Commission, by filing a written notice with the City Clerk within 15 days of the fee determination (Sec.
35). Because ADUs fall under Sec. 15(h), that appeal path is not something an ADU applicant needs, since the exemption removes the fee at the outset rather than leaving it open to dispute.
Violations & Fines
There is no fee-related enforcement action against an ADU itself since Section 10-30.15(h) removes the Traffic Impact Fee obligation entirely; the exemption is self-executing once Planning confirms the project is a genuine ADU rather than a new stand-alone dwelling. A property owner who misrepresents a project to claim the exemption, or converts an exempted addition into an unpermitted new unit, remains subject to the City's standard building and zoning code enforcement outside this article, and any TIF improperly avoided on a non-qualifying project can be assessed retroactively before a certificate of occupancy issues.
Frequently Asked Questions
Does Hayward charge a traffic impact fee for building an ADU?
Are there other city fees an ADU might still owe in Hayward?
Who decides if a project qualifies as an exempt ADU rather than a new unit subject to the fee?
Sources & Official References
Other rules in Hayward
California rules heatmap·Compare Hayward to another location·View the California accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
ADU Impact Fees in Nearby Cities
How other cities in Alameda County handle adu impact fees.