Keystone Custom Homes is one of the top 100 home builders in the nation and is the first builder ever to be named America's Best Builder three times by Builder Magazine. Distinguished as Central Pennsylvania's largest independent homebuilder, the company is building homes in over 40 communities throughout Lancaster, York, Adams, Dauphin, Montgomery, Berks, Chester, and Lebanon counties, as well as Cecil, Harford, Frederick and Carrol counties in Northern Maryland.