Removal, enclosure or sealing
Permanent abatement removes lead paint or covers it in a way designed to last at least 20 years, and it needs a CDPH-certified Supervisor or Worker, a written plan and clearance. A shorter-term interim control, such as sealing sound paint, does not need CDPH certification, but containment and the Title 17 cleanliness standard still apply. When lead paint is only disturbed by a remodel, the EPA renovation rules are in play instead.
A sealing coat belongs on paint that is sound, on a wall that is neither rubbed nor damp, after loose paint has been dealt with. Encapsulants are formulated to bond; standard wall paint is not.
What affects the cost
The number of rooms and components, how much of the paint is failing, whether stripping or covering is chosen, whether the home is occupied and the notice, plan and clearance steps of permanent abatement all shape the scope.
Interior jobs begin with a test (see lead paint inspection and testing) unless the paint is only being disturbed by a remodel, which lead-safe renovation and remodeling covers. Other services are on the homepage of Redwood City Lead Paint Removal.