30 ILCS 538/1-50

(a) A contract or agreement under this Act shall require the progressive design-build entity, or the construction manager or general contractor of the progressive design-build entity, and all subcontractors of the progressive design-build entity to comply with Section 30-22 of the Illinois Procurement Code as it applies to responsible bidders and to present satisfactory evidence of that compliance to the State construction agency. (b) A contract or agreement under this Act shall require the progressive design-build entity or the construction manager or general contractor of the progressive design-build entity to enter into a project labor agreement used by the State construction agency. (c) This Section does not apply to construction-related professional services. As used in this Section, "professional services" means those services within the scope of the practice of architecture, professional engineering, structural engineering, or registered land surveying, as defined by the laws of this State.