Window replacements in California can trigger Title 24 energy compliance requirements depending on the scope of the project and local jurisdiction requirements. It is not always a simple yes or no — here is what you need to know.
When window replacements typically require Title 24
If you are replacing windows as part of a larger permitted project — such as an addition, a remodel, or a significant alteration — Title 24 compliance documentation will almost certainly be required as part of the overall permit package.
For standalone window replacement projects (replacing existing windows without other construction), Title 24 requirements depend on local jurisdiction rules and the percentage of window area being altered. Some jurisdictions require documentation when a significant portion of the total window area is being replaced or when the new windows do not meet minimum performance standards.
What do Title 24 requirements mean for windows?
Windows are a key variable in Title 24 energy modeling. The U-factor (insulation value) and Solar Heat Gain Coefficient (SHGC) of your windows affect whether your project meets the energy budget for your climate zone. Better-performing windows — lower U-factor, appropriate SHGC for your climate zone — make it easier to achieve compliance, especially in hotter inland areas.
What should I do?
Check with your local building department for standalone window replacement projects. For window replacements that are part of a larger permitted project, a Title 24 report will almost always be required. Title24Comply can prepare your compliance documentation starting at $199 for ADU-scale projects or $245 for residential projects.