GDI Inc. is a custom home building company established in Weymouth, MA in 2001 to construct single family housing. It is a family-owned business, operated with pride, ethics, and concern. Tailored to your needs and desires, we build homes that reflect and enhance the quality of your life. Jan Hanzl is a custom home builder who focuses on building or remodeling unique, high-end custom homes. He has over 18 years experience in the residential construction business and has hands on experience in each phase of building contemporary, traditional, ultra modern and classic homes.