Pritchett's Closets & Blinds is a closets and blinds company that Jay Pritchett formerly owned and worked at.
Jay owned the company for many years and, being the owner of the company, became very rich in his later life.
In his younger years, while he was still married to Dede and their children Claire and Mitchell were still children, they were all living paycheck to paycheck and Jay was working all the time and was almost never around, working his tail off to provide food and shelter. It appears that Jay working all the time caused DeDe to become crazy later as said in "Arrested".
In "First Days", Claire started working at the company, after 20 years of being a housewife and stay-at-home mom.