Licensed General Engineering (A) contractors in Ontario, CA

The California Contractors State License Board (CSLB) lists 60 General Engineering (A) contractors in Ontario, California. Each links to a full dossier with license status, insurance, bond, and enforcement — as of October 6, 2026.

60 contractors

Abc Resources INC
Ontario, CA · CSLB #538680 · as of October 6, 2026
Active · clear
Ace Engineering INC
Ontario, CA · CSLB #613320 · as of October 6, 2026
Active · clear
Acosta Pipeline INC
Ontario, CA · CSLB #1064810 · as of October 6, 2026
Active · clear
Allwayss
Ontario, CA · CSLB #1088428 · as of October 6, 2026
Active · clear
Anton Construction
Ontario, CA · CSLB #461541 · as of October 6, 2026
Active · clear
Arijet Corporation
Ontario, CA · CSLB #916562 · as of October 6, 2026
Active · clear
Dees Burke Engineering Constructors LLC
Ontario, CA · CSLB #1012305 · as of October 6, 2026
Active · clear
Cai Fall Protection Systems
Ontario, CA · CSLB #1077144 · as of October 6, 2026
Active · clear
California Complete Asphalt Services
Ontario, CA · CSLB #1095474 · as of October 6, 2026
Active · clear
Cash Grading Contractors INC
Ontario, CA · CSLB #756412 · as of October 6, 2026
Active · clear
Cgo Construction Company INC
Ontario, CA · CSLB #532200 · as of October 6, 2026
Active · clear
Choice Builder Solutions LLC
Ontario, CA · CSLB #1032593 · as of October 6, 2026
Active · clear
Commercial Concrete Constructors INC
Ontario, CA · CSLB #858888 · as of October 6, 2026
Active · clear
Constru One INC
Ontario, CA · CSLB #972427 · as of October 6, 2026
Active · clear
C P Construction CO INC
Ontario, CA · CSLB #304795 · as of October 6, 2026
Active · clear
Crown Communications Engineering INC
Ontario, CA · CSLB #1062965 · as of October 6, 2026
Active · clear
Delta Group INC
Ontario, CA · CSLB #1107352 · as of October 6, 2026
Active · clear
Doja INC
Ontario, CA · CSLB #597764 · as of October 6, 2026
Active · clear
Duo Cap Construction INC
Ontario, CA · CSLB #1131376 · as of October 6, 2026
Active · clear
Earthscapes
Ontario, CA · CSLB #1027517 · as of October 6, 2026
Active · clear
Envirokinetics INC
Ontario, CA · CSLB #828248 · as of October 6, 2026
Active · clear
Fairchild Plumbing & Mechanical INC
Ontario, CA · CSLB #606705 · as of October 6, 2026
Active · clear
Foxtrot Construction
Ontario, CA · CSLB #1035680 · as of October 6, 2026
Active · clear
Garcon Construction INC
Ontario, CA · CSLB #913550 · as of October 6, 2026
Active · clear
GC Construction & Fire Protection INC
Ontario, CA · CSLB #1113745 · as of October 6, 2026
Active · clear
Gregg Electric INC
Ontario, CA · CSLB #201042 · as of October 6, 2026
Active · clear
Elgin Guerrero
Ontario, CA · CSLB #1113824 · as of October 6, 2026
Active · clear
G V C O Construction INC
Ontario, CA · CSLB #980998 · as of October 6, 2026
Active · clear
HHS Construction LLC
Ontario, CA · CSLB #818906 · as of October 6, 2026
Active · clear
High Speed Rooter And Plumbing INC
Ontario, CA · CSLB #1017796 · as of October 6, 2026
Active · clear
Inland Design Build
Ontario, CA · CSLB #1005429 · as of October 6, 2026
Active · clear
Mehdi Jaber
Ontario, CA · CSLB #1034053 · as of October 6, 2026
Active · clear
Jewels Construction INC
Ontario, CA · CSLB #770969 · as of October 6, 2026
Active · clear
JN Construction INC
Ontario, CA · CSLB #1001396 · as of October 6, 2026
Active · clear
Kemcorp Construction INC
Ontario, CA · CSLB #934522 · as of October 6, 2026
Active · clear
Kormex Construction INC
Ontario, CA · CSLB #1073142 · as of October 6, 2026
Active · clear
Leothacue Enterprises INC
Ontario, CA · CSLB #1025024 · as of October 6, 2026
Active · clear
Marlu Construction
Ontario, CA · CSLB #960949 · as of October 6, 2026
Active · clear
M J Pacific INC
Ontario, CA · CSLB #1051869 · as of October 6, 2026
Active · clear
Pascal & Ludwig Constructors INC
Ontario, CA · CSLB #373525 · as of October 6, 2026
Active · clear
Power Grade INC
Ontario, CA · CSLB #935306 · as of October 6, 2026
Active · clear
Powerhouse Grading INC
Ontario, CA · CSLB #909465 · as of October 6, 2026
Active · clear
Practicore Solutions INC
Ontario, CA · CSLB #1146273 · as of October 6, 2026
Active · clear
Premier Paving INC
Ontario, CA · CSLB #638301 · as of October 6, 2026
Active · clear
Primebore Directional Boring Corp
Ontario, CA · CSLB #847499 · as of October 6, 2026
Active · clear
Proffitt Excavating INC
Ontario, CA · CSLB #952224 · as of October 6, 2026
Active · clear
Progressive Fueling Construction INC
Ontario, CA · CSLB #894043 · as of October 6, 2026
Active · clear
Riptide Industries
Ontario, CA · CSLB #1056742 · as of October 6, 2026
Active · clear
Robert Alan Construction INC
Ontario, CA · CSLB #1022004 · as of October 6, 2026
Active · clear
Rodriguez Brothers Engineering INC
Ontario, CA · CSLB #670969 · as of October 6, 2026
Active · clear
Sitelogiq INC
Ontario, CA · CSLB #1054171 · as of October 6, 2026
Active · clear
SM Waterworks Backflow Service
Ontario, CA · CSLB #1115619 · as of October 6, 2026
Active · clear
Spec Construction CO INC
Ontario, CA · CSLB #419626 · as of October 6, 2026
Active · clear
A C Spraggins Engineering & Underground INC
Ontario, CA · CSLB #383440 · as of October 6, 2026
Active · clear
Thacker's Engineering
Ontario, CA · CSLB #1141853 · as of October 6, 2026
Active · clear
Rudolf Carl Theilacker Contractor
Ontario, CA · CSLB #279711 · as of October 6, 2026
Active · clear
Turbine Repair Services LLC
Ontario, CA · CSLB #981674 · as of October 6, 2026
Active · clear
West Coast Pipeline Specialist
Ontario, CA · CSLB #1129511 · as of October 6, 2026
Active · clear
Yacko Construction INC
Ontario, CA · CSLB #1012085 · as of October 6, 2026
Active · clear
John Yacko
Ontario, CA · CSLB #764923 · as of October 6, 2026
Active · clear

See all General Engineering (A) contractors in California →

Data sourced from the California Contractors State License Board (CSLB), current as of October 6, 2026. IsItLicensed is not affiliated with or endorsed by the CSLB or the State of California. Always verify against the official record.