225 ILCS 305/3
Nothing in this Act shall be deemed or construed to prevent the practice of structural engineering as defined in the Structural Engineering Practice Act of 1989, the practice of professional engineering as defined in the Professional Engineering Practice Act of 1989, or the preparation of documents used to prescribe work to be done inside buildings for non-loadbearing interior construction, furnishings, fixtures and equipment, or the offering or preparation of environmental analysis, feasibility studies, programming or construction management services by persons other than those licensed in accordance with this Act, the Structural Engineering Practice Act of 1989 or the Professional Engineering Practice Act of 1989.
Nothing contained in this Act shall prevent the draftsmen, students, project representatives and other employees of those lawfully practicing as architects under the provisions of this Act, from acting under the responsible control of their employers, or to prevent the employment of project representatives for enlargement or alteration of buildings or any parts thereof, or prevent such project representatives from acting under the responsible control of the architect by whom the construction documents including drawings and specifications of any such building, enlargement or alteration were prepared.
Nothing in this Act or any other Act shall prevent an architect from practicing interior design services. Nothing in this Act shall be construed as requiring the services of an interior designer for the interior designing of a single family residence.
The involvement of an architect is not required for the following:
However, when an ordinance of a unit of local government requires the involvement of an architect for any buildings included in the preceding paragraphs (A) through (D), the requirements of this Act shall apply. All buildings not included in the preceding paragraphs (A) through (D), including multi-family buildings and buildings previously exempt from the involvement of an architect under those paragraphs but subsequently non-exempt due to a change in occupancy or use, are subject to the requirements of this Act. Interior alterations which result in life safety or structural changes of the building are subject to the requirements of this Act.
225 ILCS 305/3