2025 California Title 24: what changed for residential projects2025 年加州 Title 24：住宅项目有哪些变化

The 2025 standards apply to permit applications filed on or after January 1, 2026. A project filed before that date is generally reviewed under the 2022 edition, even if construction runs into 2026. This matters because the two editions can produce different compliance margins, different modeled measures and different ECC / HERS test lists for the same building.2025 版标准适用于 2026 年 1 月 1 日及以后报审的许可申请。此前报审的项目一般按 2022 年版审查，即便施工延续到 2026 年。这很重要，因为两版对同一建筑可能得出不同的合规裕度、不同的建模措施与不同的 ECC / HERS 测试清单。

Some jurisdictions also accept a transition window or a specific-submittal cutoff. Confirm the edition and the effective date with the building department for the specific address before the report is modeled, because re-modeling after plan check is more expensive than choosing the right edition up front.部分辖区还设有过渡窗口或特定报审截止日。在建模报告之前，请就具体地址与建筑部门确认适用版本与生效日期，因为图纸审查后再重新建模比一开始选对版本更贵。

Across the last several cycles the standards have tightened the building envelope, expanded solar and battery readiness, moved the prescriptive baselines toward heat pumps, and increased electric-vehicle readiness in CALGreen. The 2025 edition continues those trajectories, and the practical effect on a project is usually felt in the envelope assemblies, the HVAC path and the field-verification list rather than in any single headline number.过去数个周期，标准持续收紧围护结构、扩大太阳能与电池就绪、将规范性基线推向热泵，并在 CALGreen 中提高电动车就绪要求。2025 年版延续这些趋势，对项目的实际影响通常体现在围护构造、暖通路径与现场核验清单上，而非某个醒目的数字。

Because the exact prescriptive tables and performance margins are edition-specific, the report is modeled against the edition in force for your filing date, using the current compliance software and the current climate-zone data for the project's ZIP code. Do not carry a prior-cycle CF-1R forward unchanged.由于确切的规范性表格与性能裕度因版本而异，报告会按您报审日适用的版本建模，并使用当前合规软件与项目邮编对应的当前气候区数据。请勿将上一周期的 CF-1R 原样沿用。

Accurate plans with the conditioned-space boundary, envelope assemblies and R-values, window and skylight schedules with U-factor and SHGC, HVAC and water-heating specifications, the duct layout, and the project address for climate-zone lookup. The more complete the inputs, the fewer assumptions get modeled — and every assumption is a place where a plan-check comment can send the report back.准确的图纸（含空调空间边界）、围护构造与 R 值、窗与天窗表（含 U 值与 SHGC）、暖通与热水规格、风管布置，以及用于气候区查询的项目地址。输入越完整，建模的假设越少——而每个假设都是图纸审查可能退回报告的地方。