Windows are a key home addition Title 24 variable — U-factor (insulation) and SHGC (solar heat gain) — with targets set by your project's modeling.
The two window metrics
- U-factor — lower insulates better
- SHGC — lower reduces cooling load
Title 24 is a statewide California energy code. Home Addition projects follow the same statewide standards; the exact requirements depend on your project's scope and address, which we model in CEC-approved compliance software. Related: do window replacements require Title 24?
Related: Home Addition Title 24 overview · pricing · Title 24 guide.