Title 24 Reports in Simi Valley

Simi Valley has no climate-zone question to answer: both street ZIPs, and the Commission's own map, put the whole city in zone 9. The more useful number for most Simi Valley jobs is in the housing data, not the zone map.

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One zone, confirmed twice

Simi Valley's two street ZIPs, 93063 and 93065, are both zone 9 in the CEC's ZIP-code table, and the Commission's own building climate zone map agrees — the whole city falls in zone 9 on that map as well, with none of the ZIP-table ambiguity that some neighbouring cities have to explain. Moorpark and Chatsworth, which the city borders, are zone 9 too. A Simi Valley address does not need a second check on which zone applies.

A city of existing houses

What varies project to project in Simi Valley is less the zone and more the building. Census Bureau survey data puts about 78% of occupied homes on utility gas heat, well above the roughly 61% statewide figure; about 73% of occupied units are owner-occupied, against about 56% statewide; and about 71% of all housing units are detached single-family houses, against about 57% statewide. About two-thirds of that housing stock was built across three decades — the 1960s, 1970s and 1980s. The typical Simi Valley Title 24 job is therefore an alteration to an existing, owner-occupied, gas-heated house rather than new construction, and the compliance approach for an alteration is not the same as for a new home.

Santa Susana and the rest of 93063

ZIP 93063 reaches well beyond the city. Census land-area data shows only about 31% of that ZIP's land sits inside Simi Valley; a small share is the Santa Susana CDP, an unincorporated community along the city's southern border, and most of the remainder is in no incorporated place at all. A 93063 address is not automatically inside city limits, which matters for which agency reviews the permit.

Submitting in Simi Valley

Permit applications go through the city's EnerGov-based Customer Self Service portal. Ordinance No. 1366 brought Simi Valley onto the 2025 editions of the California codes, including the Energy Code, effective 1 January 2026. Edison's wires still carry the power, but the default mix on them is chosen by Clean Power Alliance, which began signing up Simi Valley residential accounts in February 2019 and set Lean Power — 36% renewable content — as the plan every account gets unless someone changes it.

Common Title 24 Questions in Simi Valley

Simi Valley 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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