Even lead-based paint that appears to be undisturbed can be a problem if it is on surfaces that children chew or that get a lot of wear and tear. Lead dust, that which can not be seen as easily, can occur on surfaces that rub or bump together where children can touch, then put into their mouths. Soil can also be a contaminate when exterior lead-based paint chips or peels and gets into the ground where children play. So, look around, and see if you see any paint that's not on the walls.
Many people like to remodel or just change a few things periodically.
If your home is older than 1978, you are likely to be exposed to lead dust. Whether replacing windows or tearing out walls, the amount of lead dust is higher than at any other time. Lead dust can circulate throughout the house and even to the neighbors if not properly attended to. Nailing, drilling, screwing, cutting, sawing, scraping or sanding into lead-painted surfaces should be done at a minimum. A lead-certified contractor can explain necessary steps for serious remodeling.