Every registered interior designer shall have a reproducible seal, or facsimile, the impression of which shall contain the name of the registered interior designer, the registration number, and the words "Registered Interior Designer, State of Illinois". The registered interior designer shall affix the signature, current date, date of registration expiration, and seal to the first sheet of any bound set or loose sheets of interior technical submissions used as contract documents between parties to the contract or prepared for the review and approval of any governmental or public authority having jurisdiction by that registered interior designer or under that registered interior designer's responsible control. The sheet of interior technical submissions in which the seal is affixed shall indicate those documents or parts thereof for which the seal shall apply. The seal and dates may be electronically affixed. The registrant may provide, at the registrant's sole discretion, an original signature in the registrant's handwriting, a scanned copy of the document bearing an original signature, or a signature generated by a computer. All interior technical submissions issued by any corporation, partnership, or professional service corporation shall contain the corporate or assumed business name in addition to any other seal requirements set forth in this Act.
A registered interior designer under this Act shall not sign and seal interior technical submissions that were not prepared by or under the responsible control of the registered interior designer, except that:
The registered interior designer exercising responsible control under which the interior technical submissions or portions of the interior technical submission were prepared shall be identified on the interior technical submissions or portions of the interior technical submissions by name and Illinois registration number.
Any registered interior designer who signs and seals interior technical submissions not prepared by that registered interior designer but prepared under that registered interior designer's responsible control by persons not regularly employed in the office where the registered interior designer is a resident shall maintain and make available to the Board upon request for at least 5 years following such signing and sealing, adequate and complete records demonstrating the nature and extent of the registered interior designer's control over, and detailed professional knowledge of the interior technical submissions throughout their preparation.
225 ILCS 310/4.1