Hayward, CA Building Safety: Plumbing Permits (2026)
Key Facts
- Adopted code
- 2025 CA Plumbing Code, based on 2024 UPC
- Appendices adopted
- A, B, C (water supply, waste/vent, alt systems)
- Enforcing agency
- Hayward Building Division
- Plan review abandonment
- 365 days if unapproved
- Permit validity
- 180 days after plan approval
- No-permit work
- Investigation fee applies (Sec. 109.4.1)
- Violation class
- Infraction, escalating to misdemeanor
Summary
Hayward adopts the 2025 California Plumbing Code, based on the 2024 Uniform Plumbing Code, by reference under Municipal Code Section 9-1.00 as part of its Building Code. The Building Division enforces plumbing permits under the same administrative amendments on fees, plan-review timelines and permit expiration that govern building permits generally.
The 2025 California Building Code (Part 2 of C.C.R. Title 24, based on the 2024 International Building Code), the 2025 California Residential Code (Part 2.5 of C.C.R. Title 24 based on the 2024 International Residential Code)... the 2025 California Plumbing Code (Part 5 of C.C.R. Title 24 based on the 2024 Uniform Plumbing Code)... published by the International Code Council, as amended by the State of California pursuant to Health and Safety Code section 17922, and as further modified by the amendments, additions, and deletions as set forth hereinafter, is hereby adopted by reference as the Building Code of the City of Hayward.
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
00, alongside the Building, Residential, Electrical, Mechanical, Energy, Historical, Existing Building and Green Building Standards Codes. 1 further adopts California Plumbing Code Appendix A (Rules for Sizing the Water Supply System), Appendix B (Notes on Combination Waste and Vent Systems) and Appendix C (Alternate Plumbing Systems) as part of Hayward's plumbing regulations. 2. 1.
Violations & Fines
Starting plumbing work before securing a permit triggers an investigation fee under amended Section 109.4.1, charged by the Building Official at no less than the standard permit fee whether or not a permit is later issued. The Uniform Plumbing Code is adopted by reference under Health and Safety Code Section 17958, so violating its requirements is an infraction under Municipal Code Section 1-3.00(b), fined up to the Government Code Section 36900 limit and elevated to a misdemeanor after a third conviction within twelve months.
Frequently Asked Questions
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Sources & Official References
Other rules in Hayward
California rules heatmap·Compare Hayward to another location·View the California building safety overview
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