Illinois · Interior Designer seal requirements
Illinois Interior Designer seal requirements: proper sizing, signing and sealing of documents
As of
Illinois registers interior designers under the Registered Interior Designers Act, administered by IDFPR, and 225 ILCS 310/4.1 requires a reproducible seal containing the designer's name, the registration number and the words "Registered Interior Designer, State of Illinois." The signature, current date, date of registration expiration and seal go on the first sheet of any bound set or loose sheets of interior technical submissions, and 68 Ill. Adm. Code 1255.45(a) requires the signature, signing date and expiration date to sit adjacent to the seal. Neither the Act nor the rule prescribes a size or shape.
Illinois licenses structural engineers under a separate Act with its own seal rule (68 Ill. Adm. Code 1480.145); a structural engineer's seal is not the PE seal below. Note also that the license expiration date has to sit next to the seal — a detail that catches out-of-state filers. The ILGA text of Section 4.1 carries the note "(Section scheduled to be repealed on January 1, 2027)" - the Act is subject to a sunset date, so the provision should be re-checked before that date. Section 1255.45 was last amended at 48 Ill. Reg. 12276, effective August 2, 2024. The statute is titled the Registered Interior Designers Act; IDFPR pages also refer to the profession's title act by its earlier name.
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Illinois Interior Designer seal
- Seal requirements
- 225 ILCS 310/4.1; 68 Ill. Adm. Code 1255.45
- Legend
- “Registered Interior Designer, State of Illinois”
- Diameter
- No diameter, dimension or shape is prescribed. Section 4.1 of the Registered Interior Designers Act states only that the seal be reproducible and describes its contents, and 68 Ill. Adm. Code 1255.45, the rule that implements it, adds a suggested facsimile design but no measurement.
- Expiration date
- The date of registration expiration must be shown, placed adjacent to the seal along with the signature and the date of signing; it is not listed among the contents of the seal impression itself, which are the name, registration number and the words "Registered Interior Designer, State of Illinois."(225 ILCS 310/4.1; 68 Ill. Adm. Code 1255.45(a))
- Signature date
- The signature and current date must be affixed to the first sheet along with the seal, and the rule requires the date of signing adjacent to the seal.(225 ILCS 310/4.1; 68 Ill. Adm. Code 1255.45(a))
- City on seal
- No city or address is called for. Section 4.1 and rule 1255.45 list the seal's contents as the name, registration number and the prescribed words; the only additional identifier required on submissions is the corporate or assumed business name where the issuer is a corporation, partnership or professional service corporation.(225 ILCS 310/4.1; 68 Ill. Adm. Code 1255.45)
- "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"."(225 ILCS 310/4.1)
- "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."(225 ILCS 310/4.1)
- "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."(225 ILCS 310/4.1; 68 Ill. Adm. Code 1255.45(b))
- "The individual registrant's written signature and date of signing, along with the date of registration expiration, shall be placed adjacent to the seal," and the rule reproduces a suggested facsimile showing the seal with signature, date signed and registration expiration lines beside it.(68 Ill. Adm. Code 1255.45(a), (c))
- "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."(225 ILCS 310/4.1)
- A registered interior designer shall not sign and seal interior technical submissions not prepared by or under the designer's responsible control, subject to the three exceptions in the Act for coordinated work of another registrant, adopted work not required to be prepared by a registered interior designer, and signing by a partner or corporate officer of a registered professional design firm.(225 ILCS 310/4.1(1), (2), (3))
- "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."(225 ILCS 310/4.1)
- A registrant who signs and seals submissions prepared under the registrant's responsible control by persons not regularly employed in the registrant's office must keep, and make available to the Board on request for at least 5 years, records demonstrating the nature and extent of that control.(225 ILCS 310/4.1)
Illinois interior designer seal questions
Does an Illinois interior design seal have to show the registration expiration date?▾
The expiration date must appear, but it is placed adjacent to the seal along with the signature and date of signing rather than inside the seal impression, whose contents are fixed as the name, registration number and "Registered Interior Designer, State of Illinois." (225 ILCS 310/4.1; 68 Ill. Adm. Code 1255.45(a))
Must every sheet be sealed in Illinois?▾
No. The seal goes on the first sheet of the set, and that sheet must indicate the documents or parts for which the seal applies. (225 ILCS 310/4.1)