Commercial Large-Loss Restoration in Illinois
19 certified commercial firms on file in Illinois. Credentials below are verified against IICRC's Certified Firm registry.
Cities with 3+ certified firms
Also served (1–2 firms)
Chicago, Marion, Alsip, Buffalo Grove, Bloomington, Colona, Downers Grove, Elgin, Caseyville, Fairview Heights, Niles, Pekin, St. Charles, Urbana, Waukegan, Wheeling, Wood Dale
What Illinois commercial firms are certified in
Certification counts across the 19 Illinois firms on file for this work. These are the credentials on record with the issuing body — not what the firms advertise.
| Credential | What it covers | Illinois firms |
|---|---|---|
| CDS | Commercial Drying Specialist | 19 |
| WRT | Water Damage Restoration Technician | 19 |
| FSRT | Fire and Smoke Damage Restoration Technician | 18 |
| AMRT | Applied Microbial Remediation Technician | 17 |
| ASD | Applied Structural Drying Technician | 17 |
| OCT | Odor Control Technician | 15 |
19 of these firms hold three or more certifications; 1 appear in two independent registries and carry a cross-verified marker; 14 operate under a national franchise brand, which is separately owned and separately credentialled from the brand itself.
Every Illinois firm we hold a record for, A–Z by city →
Commercial in Illinois: common questions
Is commercial work licensed in Illinois?
No US state licenses commercial work specifically. General contractor registration may apply to any rebuild that follows. The checkable credential is IICRC certification, which is what every listing on this page is verified against.
What certifications do Illinois commercial firms actually hold?
Across the 19 Illinois firms on file for this work, the most common credentials are CDS (Commercial Drying Specialist) held by 19 firms, WRT (Water Damage Restoration Technician) held by 19 firms, FSRT (Fire and Smoke Damage Restoration Technician) held by 18 firms, AMRT (Applied Microbial Remediation Technician) held by 17 firms. 19 hold three or more certifications. Certification describes verified training rather than the services a firm chooses to advertise.
How were these Illinois firms verified?
Every certification was checked against IICRC's own Certified Firm registry, not against the firm's marketing. 1 of the 19 appear in two independent registries and carry a cross-verified marker. Checked August 14, 2026.