Running the Business · Part 7
Code cycles: the 2025 California Plumbing Code took effect January 1, 2026; the intervening supplement lands July 1, 2027; the 2028 code on January 1, 2029. How to track them
The plumbing code a plumber is inspected against changes on a schedule: a new California Plumbing Code every three years, effective January 1 of the year after publication, with an intervening supplement halfway through, plus each city's local amendments filed on their own timeline. The 2025 California Plumbing Code took effect January 1, 2026; the intervening supplement takes effect July 1, 2027; the 2028 code takes effect January 1, 2029. This lesson is the cycle, which edition applies to a given job (the permit date), where the changes are published and how to read only the parts that touch a C-36, and the two habits that keep the price book and the pre-inspection checklist current: the January and July check, and the city amendment list.
What the full lesson covers
- Title 24 is adopted on a triennial cycle by the Building Standards Commission and takes effect 180 days after publication (H&S 18941.5): the 2025 CPC published July 1, 2025, effective January 1, 2026; the intervening supplement published January 1, 2027, effective July 1, 2027; the 2028 code published July 1, 2028, effective January 1, 2029.
- The edition in effect on the date the permit application is filed governs the job, under the jurisdiction's transition rules; a job permitted in December 2025 was inspected to the 2022 code, one permitted in January 2026 to the 2025 code.
- Cities and counties adopt each edition by ordinance and may add more restrictive amendments with findings (H&S 17958.5); the city's amendment ordinance is the second document to read each cycle.
- Read the change list, not the whole code: IAPMO's and the commission's summaries of changes, filtered to Chapters 4 through 7, 9, 10, and 12 for a C-36, and update the code card, the price book items the change touches, and the pre-inspection checklist.
- Calendar January 1 and July 1 every year as "check the code and the city," the way the license expiration is calendared.
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More lessons in Staying Licensed
- 1Renewal every two years: the clock, the fee, the five-year window, and what an expired license means mid-job
- 2A bond or workers' compensation lapse suspends the license automatically. The most common suspension, and the calendar that prevents it
- 3Address changes within 90 days, and personnel changes: the notices that keep the license record true
- 4Code cycles: the 2025 California Plumbing Code took effect January 1, 2026; the intervening supplement lands July 1, 2027; the 2028 code on January 1, 2029. How to track themYou are here
- 5Record retention: what to keep, for how long, and where the clocks come from
- 6Template: the annual compliance calendar