Boiler, hot water heating and steam fitting contractors in Sonoma, CA

4 licenses with the C-4 classification list Sonoma (Sonoma County) as their address with the state, 3 of them active. Active licenses with nothing flagged come first.

• ✓American BuildersA · B · C-4 · C-10 +2 · #427930 Sonoma · Sonoma County Active
• ✓Bonney Inc Dba Heatwave SystemsC-4 · C-36 · #857673 Sonoma · Sonoma County Active
• ✓Peterson Mechanical IncB · C-4 · C-16 · C-20 +5 · #171486 Sonoma · Sonoma County Active
• !Pioneer BuildersA · C-4 · C-16 · #555580 Sonoma · Sonoma County Suspended: bond lapsed

Source: CSLB license file, Nov 8, 2026All trades in Sonoma