C-4 — page 2 of 2
303 clear company licenses whose first classification is “C-4 — Boiler, Hot Water Heating and Steam Fitting”.
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| Place | Contractor | License | Main classification | Expires |
|---|---|---|---|---|
| San Mateo, CA | WING CARY PLUMBING & FIRE PROTECTION INC | 815871 | C-4 — Boiler, Hot Water Heating and Steam Fitting | Oct 31, 2027 |
| Los Angeles, CA | WITTLER-YOUNG SERVICE CO INC | 302333 | C-4 — Boiler, Hot Water Heating and Steam Fitting | May 31, 2028 |
| San Francisco, CA | YUM'S MECHANICAL CO INC | 583839 | C-4 — Boiler, Hot Water Heating and Steam Fitting | Dec 31, 2027 |
Alphabetical order — this site ranks no one. Company licenses with a clear status in the CSLB file of October 1, 2026. Sole owners are not on this site; for today's status and complaints, use the CSLB's Instant License Check. How to read this.