John Mc Donagh Builders and Energy Systems

Castro Valley · Alameda County
Active license, no suspensions or flags in the state's file.

Disciplinary history (citations and accusations) is on the state's license page, linked below.

License
#422946
Status
Active
Classes
B General building contractor
C-4 Boiler, hot water heating and steam fitting contractor
C-10 Electrical contractor
C-27 Landscaping contractor
C-33 Painting and decorating contractor
C-36 Plumbing contractor
C-38 Refrigeration contractor
C-43 Sheet metal contractor
HAZ Hazardous substance removal certification
Business type
Sole Owner
Issued
May 18, 1982
Expires
May 31, 2028

From the CSLB license file as of Nov 8, 2026. See this license on CSLB.ca.gov for its disciplinary history and to confirm before you hire.

Other general building contractors in Castro Valley

Active licenses with no suspensions or flags on file. See all of them.