MILLER BUILDING SYSTEMS, INC. EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT JUNE 28, 1997 The subsidiaries of the Registrant are as follows: EFFECTIVE: June 29, 1997 Percentage of Voting Incorporated Securities Owned By Name Under Law of: Immediate Parent Miller Building Systems of Indiana, Inc. Indiana 100% Miller Building Systems of Pennsylvania,Inc. Indiana 100% Miller Building Systems of Kansas, Inc. Kansas 100% PME Pacific Systems, Inc. California 100% (1) Miller Building Systems of South Dakota,Inc. South Dakota 100% (2) (1) Inactive Corporation with no assets. (2) Wholly-owned subsidiary of Miller Building Systems of Kansas, Inc.