About Sonderegger Inc.

Sonderegger Construction started in 1949 when Ernest Sonderegger started doing residential and commercial construction in Monticello. The company started out with just a backhoe and dump truck to excavate foundations. A few years later Ernest started a batchplant to mix their concrete on North Highway 191, which has since moved to East Highway 491 where the company is located today. Paul, Ernest’s son, now owns the company which has evolved into excavation, utilities, and concrete supply and materials production.