Title 24 is California's Building Energy Efficiency Standards. It sets requirements for how buildings — including windows and glazing — perform to reduce energy use.
For window replacement projects, Title 24 can influence the glass package and performance ratings required, depending on the project scope and location. Your licensed installer confirms what applies to your specific property.
Title 24 is periodically updated, and rebate availability from utilities changes over time. Always verify current requirements and any rebates directly with your utility and your installer before relying on them.