About JPI JPI was started in 1978 and incorporated in 1984. The company started as a stucco contractor and eventually moved into General Contracting. As a result of work as a General Contractor, JPI began to do primarily window replacement and over the last 10 years we have installed over 25, 000 windows. In 1998, JPI became a full service contract glazier and in 2004, we began in-house fabrication. With this service, we are now able to ship fabricated product to the jobsites ready for installation.