About Us

A short history of our past 40 years  

Chicago Hollow Metal, known throughout the Midwest as Door Doctors, has been modifying, repairing and installing doors since 1987. Tom Johnson, an army veteran and union carpenter, founded the company in the 1980’s after identifying a need for quality work within the door and hardware field. As demand for his expertise grew, he hired union technicians who shared his ethos of excellence. Some of those field techs are still with the company along with a younger generation that includes Tom’s two sons, and the son of one of our original Door Doctors. Meanwhile, our reputation for quality door work grew throughout the Chicagoland region and the Midwest.

Door Doctors’ technicians field-modify installed openings. We install and repair commercial, industrial, institutional, and multi-unit doors, along with their frames and hardware. Often, we can modify or repair an existing opening, saving our customers the time, money and inconvenience of installing new door systems. Look on our Services page to see the repairs and modifications we commonly do. We also appreciate the unusual job, and all our technicians pride themselves on their ability to solve any door-related issue. What’s more, we can design, supply, and then implement the finished products with a complete turnkey package.

We have offered our customers valuable Life Safety Compliance field surveys since day one. These inspections are performed by field technicians and project managers that have extensive knowledge of NFPA 80 and 101 codes and requirements. Our invaluable survey sheets are completed on Microsoft Excel Spreadsheets to enable easy (non-propriety) access by all building managers and owners.


Please pass along a great compliment from me. The work has exceeded my expectations and if we ever need door work perform in the future we will keep your company in mind.

John Maas, RPA, MFA, Chicago Symphony Orchestra

Every one of their employees are concerned on doing the best job possible for us. It is refreshing to see that they do not just treat us as a “job” but rather an ongoing customer.  

Kenneth Schowlow, Indian Prairie School District # 204