Exhibit 21 SUBSIDIARIES OF THE REGISTRANT ------------------------------ The Company is the owner of all of the issued and outstanding stock of the following corporations, except as noted below. State or Country of Name of Subsidiary Incorporation ------------------ ------------------ Apogee Enterprises International, Inc. Barbados Prism Assurance, Ltd. Vermont Harmon, Inc. Minnesota Harmon Contract, Inc. Minnesota Harmon Contract Asia, Ltd. (1) Minnesota Harmon Contract Asia Sdn Bhd (2) Malaysia Harmon Contract U.K., Limited (3) United Kingdom Harmon Europe (4) (7) France Viracon, Inc. Minnesota Viratec Thin Films, Inc. (5) Minnesota Viracon Georgia, Inc. (5) Minnesota Viracon/Curvlite, Inc. Minnesota Tru Vue, Inc. Illinois Harmon Glass Company Minnesota Apogee Sales Corporation (6) South Dakota Apogee Harmon, Inc. (7) Minnesota Apogee Wausau Group, Inc. Wisconsin Harmon CFEM Facades (UK) Ltd. (7) (8) United Kingdom Harmon/CFEM Facades S.A. (7) (9) France Harmon Facalu S.A. (7) (9) France Harmon Sitraco S.A. (7) (9) France Harmon Voisin S.A. (7) (9) France VIS'N Service Corporation (7) (10) Minnesota Balangier Designs, Inc. (11) New Jersey (1) Owned by Harmon Contract, Inc. (2) Owned by Harmon Contract Asia, Ltd. (3) 99.99% owned by Harmon Contract, Inc. and .01% by Apogee Enterprises, Inc. (4) 100% owned by various Apogee entities (5) Owned by Viracon, Inc. (6) Owned by Harmon Glass Company (7) Inactive (8) 99.99% owned by Harmon Europe S.A. and .01% by Apogee Enterprises, Inc. (9) Owned by Harmon Europe S.A. (10) 99.6% owned by Harmon Glass Company (11) Owned by Tru Vue, Inc.