Licensed General Engineering (A) contractors in California

The California Contractors State License Board (CSLB) lists 15,265 California contractors classified A (General Engineering (A)). Each entry below links to a full dossier with license status, insurance, bond, and enforcement — as of July 7, 2026.

Showing 9,721–9,780 of 15,265 contractors

Old La Honda General Engineering
La Honda, CA · CSLB #1014495 · as of July 7, 2026
Active · clear
Old West Energy Services INC
Greeley, CA · CSLB #1106278 · as of July 7, 2026
Active · clear
Olea Eng
Fresno, CA · CSLB #924114 · as of July 7, 2026
Active · clear
Olenders Excavating INC
Weimar, CA · CSLB #876178 · as of July 7, 2026
Active · clear
Oliva Construction & Engineering INC
Whittier, CA · CSLB #1151300 · as of July 7, 2026
Active · clear
Olivaz Construction
Santa Ana, CA · CSLB #1152629 · as of July 7, 2026
Active · clear
Olive Branch
Upland, CA · CSLB #907556 · as of July 7, 2026
Active · clear
Oller Construction
Modesto, CA · CSLB #780327 · as of July 7, 2026
Active · clear
Olra Engineering
S San Francisco, CA · CSLB #1003787 · as of July 7, 2026
Active · clear
Olsen-beal Associates
Lindon, CA · CSLB #582456 · as of July 7, 2026
Active · clear
Olsen Investments INC DBA Olsen Excavation & Grading
Sonora, CA · CSLB #565297 · as of July 7, 2026
Active · clear
H C Olsen Construction Company INC
Monrovia, CA · CSLB #177029 · as of July 7, 2026
Active · clear
Daniel D Olsen DBA Olsen Paving & Sealcoating
Stateline, CA · CSLB #408888 · as of July 7, 2026
Active · clear
Olson And CO Steel
San Leandro, CA · CSLB #453003 · as of July 7, 2026
Active · clear
Olson Construction Company
San Diego, CA · CSLB #940995 · as of July 7, 2026
Active · clear
Olson Precast Company
Las Vegas, CA · CSLB #751277 · as of July 7, 2026
Active · clear
T J Olson
American Canyon, CA · CSLB #1077997 · as of July 7, 2026
Active · clear
Olsson Construction INC
Orange, CA · CSLB #758748 · as of July 7, 2026
Active · clear
Oltmans Construction CO
Whittier, CA · CSLB #86393 · as of July 7, 2026
Active · clear
Olympic Land-construction INC
Sacramento, CA · CSLB #424828 · as of July 7, 2026
Active · clear
Olympos Construction INC
Simi Valley, CA · CSLB #940910 · as of July 7, 2026
Active · clear
Omega Contractors INC
North Hollywood, CA · CSLB #1026633 · as of July 7, 2026
Active · clear
Omega Industrial Marine
Chula Vista, CA · CSLB #769854 · as of July 7, 2026
Active · clear
Omega Technical Services INC
Claremont, CA · CSLB #992334 · as of July 7, 2026
Active · clear
O & M Industries
Arcata, CA · CSLB #284930 · as of July 7, 2026
Active · clear
Omnia Engineering CO LLC
West Hills, CA · CSLB #1155284 · as of July 7, 2026
Active · clear
Omni Energy Solutions INC
Vacaville, CA · CSLB #1058789 · as of July 7, 2026
Active · clear
Omni Underground
Clovis, CA · CSLB #1036288 · as of July 7, 2026
Active · clear
Eddy Dean Monce DBA Onesource San Diego
San Diego, CA · CSLB #406797 · as of July 7, 2026
Active · clear
On Demand Contractors INC
La Palma, CA · CSLB #1072595 · as of July 7, 2026
Active · clear
One Engineering Group
Brea, CA · CSLB #1150181 · as of July 7, 2026
Active · clear
One General Engineering
Las Vegas, CA · CSLB #974797 · as of July 7, 2026
Active · clear
One Hat Construction INC
San Diego, CA · CSLB #1061807 · as of July 7, 2026
Active · clear
O'neil Engineering INC
Burlingame, CA · CSLB #1142594 · as of July 7, 2026
Active · clear
J W O'neil Construction INC
Temecula, CA · CSLB #1116026 · as of July 7, 2026
Active · clear
O'neill Electric INC
Duarte, CA · CSLB #1037240 · as of July 7, 2026
Active · clear
M Kevin O'neill Construction Company INC
Chula Vista, CA · CSLB #377869 · as of July 7, 2026
Active · clear
W E O'neil Construction CO Of California
El Segundo, CA · CSLB #494031 · as of July 7, 2026
Active · clear
O Nelson & Son INC
Woodside, CA · CSLB #307071 · as of July 7, 2026
Active · clear
One Moore Power Solutions INC
Perris, CA · CSLB #1124379 · as of July 7, 2026
Active · clear
One Stop INC
Gilroy, CA · CSLB #788324 · as of July 7, 2026
Active · clear
One Tractor Doze It All INC
Wildomar, CA · CSLB #800060 · as of July 7, 2026
Active · clear
One Way Development & Construction Company INC
Redding, CA · CSLB #654576 · as of July 7, 2026
Active · clear
On Grade General Engineering INC
Santa Rosa, CA · CSLB #1049929 · as of July 7, 2026
Active · clear
On Point Grading & Paving INC
Fresno, CA · CSLB #1026372 · as of July 7, 2026
Active · clear
Onq Energy Services
Santa Clarita, CA · CSLB #1018391 · as of July 7, 2026
Active · clear
On-site Commercial Services INC
Livermore, CA · CSLB #936073 · as of July 7, 2026
Active · clear
On - Site Engineering And Asphalt
Loomis, CA · CSLB #846782 · as of July 7, 2026
Active · clear
On-site Engineering & Asphalt
Loomis, CA · CSLB #851332 · as of July 7, 2026
Active · clear
On-site Equipment INC
Diamond Springs, CA · CSLB #1141858 · as of July 7, 2026
Active · clear
On Site General Engineering INC
Livermore, CA · CSLB #1003225 · as of July 7, 2026
Active · clear
Ontario Tunnel Constructors
Riverside, CA · CSLB #1100960 · as of July 7, 2026
Active · clear
Ontiveros Design Build & Remodel
Bonita, CA · CSLB #1004894 · as of July 7, 2026
Active · clear
Ontivity LLC
New Braunfels, CA · CSLB #1132938 · as of July 7, 2026
Active · clear
Ontrack Construction
Sanger, CA · CSLB #1155462 · as of July 7, 2026
Active · clear
Ontrax Construction INC
Lancaster, CA · CSLB #1000760 · as of July 7, 2026
Active · clear
Onyx Paving Company INC
Yorba Linda, CA · CSLB #630360 · as of July 7, 2026
Active · clear
Opal Fuels Station Services LLC
Rancho Cucamonga, CA · CSLB #1063659 · as of July 7, 2026
Active · clear
Opdi Construction INC
Carmichael, CA · CSLB #1117057 · as of July 7, 2026
Active · clear
Operations Management International INC
Denver, CA · CSLB #911923 · as of July 7, 2026
Active · clear

Data sourced from the California Contractors State License Board (CSLB), current as of July 7, 2026. IsItLicensed is not affiliated with or endorsed by the CSLB or the State of California. Always verify against the official record.