Use the code cycle tied to the submittal

Building codes for an Anaheim ADU

The City states that the 2025 California Building Codes and Anaheim amendments apply to residential projects submitted on or after January 1, 2026. Earlier submissions may follow a different cycle.

Anaheim information checked September 7, 2026. Check the current agency pages before relying on a rule for the address.

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01

Use the code edition for the submission date

The listed codes cover building, residential, electrical, mechanical, plumbing, energy, fire, existing buildings, and green standards. Which provisions apply depends on the project.

Confirm which California code cycle and Anaheim amendments govern the application. Save that basis with the project files so later participants use the same edition.

02

Put local design criteria in the engineering brief

Anaheim also publishes local design criteria, including climate, wind, seismic, and mapped hazard references. Designers must use the current sources.

Wind, seismic, climate, and mapped conditions can affect the structural approach. The responsible designer should confirm which published criteria apply.

03

Issue corrections to the people building the work

A construction proposal should identify the approved drawing set and incorporate later corrections before work is priced or built.

When a review comment changes a detail, update the affected sheets and tell the estimator, trade contractor, and superintendent. A stamped set is useful only when the field has it.

04

Do not price from an obsolete plan set

Write the drawing date and revision on the proposal. If plans change before signing, reconcile the price and construction notes rather than assuming the effect is minor.

City and state references

City and state pages behind the guidance

Use the agency material as the current starting point, then confirm how it applies to the property.

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Tell us what exists today, who will use the ADU, and which property issues concern you most.

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