Boiler, hot water heating and steam fitting contractors in Castro Valley, CA
2 licenses with the C-4 classification list Castro Valley (Alameda County) as their address with the state, 2 of them active. Active licenses with nothing flagged come first.
- Frank Bonetti Plumbing IncC-4 · C-20 · C-34 · C-36 +1 · #251165 Castro Valley · Alameda County Active
- John Mc Donagh Builders and Energy SystemsB · C-4 · C-10 · C-27 +5 · #422946 Castro Valley · Alameda County Active
Source: CSLB license file, Nov 8, 2026All trades in Castro Valley