Billtown Mechanical Corporation was founded and incorporated in October of 1983 by brothers Bern and Larry Strosser. The company began its business from a garage on Mahaffee Lane in Old Lycoming Township, Williamsport, Pennsylvania in March 1984. At that time there were four employees.

In 1985, Billtown Mechanical purchased the machinery and building of the defunct Williamsport Plumbing and Heating located at 315 Railway Street. The business remained at that site until 1992. At that time there were 12 employees.

In 1992, Bern Strosser purchased a 14,500 square foot facility at 25 West Second Ave in South Williamsport. Approximately 11,000 square feet of this is occupied by Billtown Mechanical with the rest being rented to various tenants.

In 1995 Larry Strosser retired and in 2002 Bern Strosser Sr. retired. Billtown Mechanical is now owned and operated by Bern Strosser's three sons, Bernie Jr., President, Jeff, Vice President, and Scott, Secretary and Treasurer. As of July, 2002, Billtown Mechanical operates with 24 employees.