Renovation rules or abatement rules
Two rule sets can apply to the same window. Replacing windows or repainting is renovation work, run by an EPA-certified firm with a certified renovator. Work designed to remove or seal lead paint for 20 years or more is abatement, done by CDPH-certified workers with a written plan and a posted notice. A test result tells you which route fits.
CDPH has said it is working on renovation regulations under SB 1076, and no adopted state rule is shown on its page today.
What affects the cost
The number of windows and doors, their size, whether they are wood or already replaced with vinyl in places, and whether they are stripped, repaired or replaced are the biggest levers. Upstairs units need scaffolding or lifts, and the final wet clean and checks add a visit.
Not every window needs replacing. Where frames are sound, lead paint encapsulation is an alternative, and the stucco or siding beside them is dealt with in exterior lead paint removal. A window swap that belongs to a larger project is a job for lead-safe renovation and remodeling. Livermore Lead Paint Removal links every service on its homepage.