Licensed General Engineering (A) contractors in Ontario, CA

The California Contractors State License Board (CSLB) lists 63 General Engineering (A) contractors in Ontario, California. Each links to a full dossier with license status, insurance, bond, and enforcement — as of June 27, 2026.

Showing 1–60 of 63 contractors

Abc Resources INC
Ontario, CA · CSLB #538680 · as of June 27, 2026
Active · clear
Ace Engineering INC
Ontario, CA · CSLB #613320 · as of June 27, 2026
Active · clear
Acosta Pipeline INC
Ontario, CA · CSLB #1064810 · as of June 27, 2026
Active · clear
Allwayss
Ontario, CA · CSLB #1088428 · as of June 27, 2026
Active · clear
Anton Construction
Ontario, CA · CSLB #461541 · as of June 27, 2026
Active · clear
Arijet Corporation
Ontario, CA · CSLB #916562 · as of June 27, 2026
Active · clear
Dees Burke Engineering Constructors LLC
Ontario, CA · CSLB #1012305 · as of June 27, 2026
Active · clear
Cai Fall Protection Systems
Ontario, CA · CSLB #1077144 · as of June 27, 2026
Active · clear
California Complete Asphalt Services
Ontario, CA · CSLB #1095474 · as of June 27, 2026
Active · clear
Cash Grading Contractors INC
Ontario, CA · CSLB #756412 · as of June 27, 2026
Active · clear
Cgo Construction Company INC
Ontario, CA · CSLB #532200 · as of June 27, 2026
Active · clear
Choice Builder Solutions LLC
Ontario, CA · CSLB #1032593 · as of June 27, 2026
Active · clear
Commercial Concrete Constructors INC
Ontario, CA · CSLB #858888 · as of June 27, 2026
Active · clear
Constru One INC
Ontario, CA · CSLB #972427 · as of June 27, 2026
Active · clear
C P Construction CO INC
Ontario, CA · CSLB #304795 · as of June 27, 2026
Active · clear
Crown Communications Engineering INC
Ontario, CA · CSLB #1062965 · as of June 27, 2026
Active · clear
Delta Group INC
Ontario, CA · CSLB #1107352 · as of June 27, 2026
Active · clear
Doja INC
Ontario, CA · CSLB #597764 · as of June 27, 2026
Active · clear
Duo Cap Construction INC
Ontario, CA · CSLB #1131376 · as of June 27, 2026
Active · clear
Earthscapes
Ontario, CA · CSLB #1027517 · as of June 27, 2026
Active · clear
Envirokinetics INC
Ontario, CA · CSLB #828248 · as of June 27, 2026
Active · clear
Fairchild Plumbing & Mechanical INC
Ontario, CA · CSLB #606705 · as of June 27, 2026
Active · clear
Foxtrot Construction
Ontario, CA · CSLB #1035680 · as of June 27, 2026
Active · clear
Garcia's Backhoe Services DBA Garcia's Construction
Ontario, CA · CSLB #1018725 · as of June 27, 2026
Active · clear
Garcon Construction INC
Ontario, CA · CSLB #913550 · as of June 27, 2026
Active · clear
GC Construction & Fire Protection INC
Ontario, CA · CSLB #1113745 · as of June 27, 2026
Active · clear
Gregg Electric INC
Ontario, CA · CSLB #201042 · as of June 27, 2026
Active · clear
Elgin Guerrero
Ontario, CA · CSLB #1113824 · as of June 27, 2026
Active · clear
G V C O Construction INC
Ontario, CA · CSLB #980998 · as of June 27, 2026
Active · clear
HHS Construction LLC
Ontario, CA · CSLB #818906 · as of June 27, 2026
Active · clear
High Speed Rooter And Plumbing INC
Ontario, CA · CSLB #1017796 · as of June 27, 2026
Active · clear
Inland Design Build
Ontario, CA · CSLB #1005429 · as of June 27, 2026
Active · clear
Mehdi Jaber
Ontario, CA · CSLB #1034053 · as of June 27, 2026
Active · clear
Jewels Construction INC
Ontario, CA · CSLB #770969 · as of June 27, 2026
Active · clear
JN Construction INC
Ontario, CA · CSLB #1001396 · as of June 27, 2026
Active · clear
Kemcorp Construction INC
Ontario, CA · CSLB #934522 · as of June 27, 2026
Active · clear
Kormex Construction INC
Ontario, CA · CSLB #1073142 · as of June 27, 2026
Active · clear
Leothacue Enterprises INC
Ontario, CA · CSLB #1025024 · as of June 27, 2026
Active · clear
Marlu Construction
Ontario, CA · CSLB #960949 · as of June 27, 2026
Active · clear
MC Ghee Construction INC
Ontario, CA · CSLB #884036 · as of June 27, 2026
Active · clear
M J Pacific INC
Ontario, CA · CSLB #1051869 · as of June 27, 2026
Active · clear
Pascal & Ludwig Constructors INC
Ontario, CA · CSLB #373525 · as of June 27, 2026
Active · clear
Power Grade INC
Ontario, CA · CSLB #935306 · as of June 27, 2026
Active · clear
Powerhouse Grading INC
Ontario, CA · CSLB #909465 · as of June 27, 2026
Active · clear
Practicore Solutions INC
Ontario, CA · CSLB #1146273 · as of June 27, 2026
Active · clear
Premier Paving INC
Ontario, CA · CSLB #638301 · as of June 27, 2026
Active · clear
Primebore Directional Boring Corp
Ontario, CA · CSLB #847499 · as of June 27, 2026
Active · clear
Proffitt Excavating INC
Ontario, CA · CSLB #952224 · as of June 27, 2026
Active · clear
Progressive Fueling Construction INC
Ontario, CA · CSLB #894043 · as of June 27, 2026
Active · clear
Riptide Industries
Ontario, CA · CSLB #1056742 · as of June 27, 2026
Active · clear
Robert Alan Construction INC
Ontario, CA · CSLB #1022004 · as of June 27, 2026
Active · clear
Rodriguez Brothers Engineering INC
Ontario, CA · CSLB #670969 · as of June 27, 2026
Active · clear
Dong Suk Suh DBA Seasons Painting & Construction CO
Ontario, CA · CSLB #692214 · as of June 27, 2026
Active · clear
Sitelogiq INC
Ontario, CA · CSLB #1054171 · as of June 27, 2026
Active · clear
SM Waterworks Backflow Service
Ontario, CA · CSLB #1115619 · as of June 27, 2026
Active · clear
Spec Construction CO INC
Ontario, CA · CSLB #419626 · as of June 27, 2026
Active · clear
A C Spraggins Engineering & Underground INC
Ontario, CA · CSLB #383440 · as of June 27, 2026
Active · clear
Thacker's Engineering
Ontario, CA · CSLB #1141853 · as of June 27, 2026
Active · clear
Rudolf Carl Theilacker Contractor
Ontario, CA · CSLB #279711 · as of June 27, 2026
Active · clear
Turbine Repair Services LLC
Ontario, CA · CSLB #981674 · as of June 27, 2026
Active · clear

See all General Engineering (A) contractors in California →

Data sourced from the California Contractors State License Board (CSLB), current as of June 27, 2026. IsItLicensed is not affiliated with or endorsed by the CSLB or the State of California. Always verify against the official record.