Lead based paint was used pervasively before 1978 and can be disturbed when replacing windows, drywall, stairs, etc. Jim recently certified with the EPA on the lead remediation process. Latsis Custom Homes is qualified to remodel homes built before 1978 and manage the abatement process necessary to avoid lead contamination. Review the new guidelines here.  http://www.epa.gov/lead/pubs/renovation.htm.