Renovation rules or abatement rules
Two rule sets can apply to the same window. If the aim is to remodel or replace, the EPA renovation rule governs and the firm needs EPA certification; if the aim is to remove or permanently seal the lead paint on the frame, the work is abatement under Title 17, needs a CDPH-certified Supervisor or Worker, and requires Form 8551 at least five days ahead. A short-term interim control needs no certification but still needs containment.
What affects the cost
The number of openings matters most, then access: a ground-floor window is quicker than one above a stair. Frame material, whether the casing and sill come out with the sash, and the choice between replacing and restoring all move the scope. A sliding door counts as an opening with a large frame.
Outside walls and trim are a separate job, exterior lead paint removal. So is a remodel that reaches the windows, lead-safe renovation and remodeling, and so is paint worth keeping in place, lead paint encapsulation. The Union City Lead Paint Removal homepage gathers all five services.