Title 24 Reports in Pomona

Pomona's own ADU page sorts accessory units into three kinds: detached, attached and conversions. Under the Energy Code those are three different reports, and a unit built without a permit raises a fourth question that the building department answers first.

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Three kinds of ADU, three different reports

The City of Pomona describes detached units, attached units and conversions of part of an existing structure, such as a garage. The Energy Commission's 2025 ADU guidance puts each on a different footing. A new detached ADU is a newly constructed building, modelled like a new single-family home, solar included. An attached ADU, or a garage turned into living space, is an addition because it adds conditioned floor area, and an attached ADU needs no solar. Turning already-conditioned space into a unit is an alteration, where only the parts being changed are checked. The category is therefore fixed from the drawings before anything is modelled.

Units built without a permit

Pomona's ADU page also sets out AB 2533, in effect since 1 January 2025, for units built without permits before 2020: the City may not deny a permit to legalise one because it breaks building standards or local ADU rules, and must approve the permits needed to fix health and safety problems. On the energy side, the Energy Commission says a never-permitted unit applying now must meet the applicable Energy Code requirements, with the building department deciding whether it counts as new construction or an addition. The report follows that decision.

Where the solar goes, and who approves it

Pomona meets Senate Bill 379's call for automated residential solar permitting with SolarAPP+, and eligibility is limited to the main dwelling's roof on a permitted home. Solar a new detached ADU needs for compliance belongs to the ADU's own application: the Energy Commission lets the new panels join an existing array on the same lot, provided they are part of that application and sized to the code. Batteries follow the requirements of the Los Angeles County Fire Department, which the City contracts with for fire protection.

In the historic districts — Lincoln Park, Wilton Heights and Hacienda Park among the residential ones, with the Landmark Quarter and the Civic Center downtown — exterior alterations need a Certificate of Appropriateness, and solar panels have a minor certificate of their own. Removing a window there needs a separate form per window, worth knowing before a report assumes new glazing.

Power supplier versus climate zone

Pomona Choice Energy, the community choice aggregator the City set up, supplies power to enrolled customers inside the city limits; Southern California Edison still delivers it and handles new service. Neither moves a Title 24 target. Those come from the climate zone, and all three Pomona ZIP codes, 91766, 91767 and 91768, are zone 9, like Claremont, La Verne and Diamond Bar. Montclair, over the San Bernardino County line, is zone 10.

Submitting in Pomona

Permits are issued by the Building and Safety Division at City Hall, which takes electronic plan submittals by email and publishes an ADU plan check guide in English and Spanish. The State Fire Marshal issued its 2025 recommended fire hazard severity zone maps for Pomona on 24 March 2025, and state law bars the City from lowering them. A mapped lot can bring wildfire-resistant rules for windows and vents, which the 2025 codes moved from Building Code Chapter 7A into the new California Wildland-Urban Interface Code.

Common Title 24 Questions in Pomona

Pomona projects fall in California climate zone 9. The zone drives the envelope and equipment requirements a report has to meet, and a single city can span more than one, so it is confirmed per address.

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