To participate on any CDB project as a subcontractor, supplier or in any capacity you must have a CDB REGISTRATION #.

If you are currently or have ever been prequalified with CDB your firm has been assigned a registration number.

Note:  Prequalification and registration are not the same.  If you intend to submit a bid for project as a prime contractor, or participant on a single prime project as a designated "protected subcontractor," then you must apply for prequalification approval. Prequalification with the CDB​

To inquire about an existing registration # send an email to:
 
    CDB.SubContractReg@illinois.gov

To apply for a new # use the attached link which will take you to registration form.