Does my project require Title 24 calculation?

In general, if your project requires a construction permit, Title 24 calculations will be required.
A title 24 report is required for any residential construction project that alters the existing envelope (walls, floors, roofs, windows, etc. ), adds/modifies mechanical/HVAC equipment, or adds/upgrades a water heater. A title 24 report is required for all new construction and addition projects. A title 24 report is required for any project that converts unconditioned space to conditioned space (such as converting a garage into a dwelling area). In the same way, as residential projects require title 24 reports, non-residential projects do as well. Non-residential projects, on the other hand, are required to submit a title 24 report if indoor or outdoor lighting is changed, amended, or upgraded.

Building Energy Efficiency Standards - Title 24

California’s energy code is designed to reduce wasteful and unnecessary energy consumption in newly constructed and existing buildings. The California Energy Commission updates the Building Energy Efficiency Standards (Title 24, Parts 6 and 11) every three years by working with stakeholders in a public and transparent process.