Execute your project on time and with exceptional quality.

OUR LOCATION
OVER 100 YEARS EXPERIENCE
OUR SERVICES

- Pipeline

- Concrete

- Grading

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  • GJ Gentry General Engineering Inc.

© 2019 by GJ Gentry General Engineering Inc.

1297 W. 9th Street
Upland, CA 91789

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Phone: 909.693.3391

BUSINESS HOURS

Mon. - 7am - 4pm

Tues. - 7am - 4pm

Wed. - 7am - 4pm

Thurs. - 7am - 4 pm

Fri. - 7am - 4pm

Sat. - CLOSED

Sun. - CLOSED

pipeline contractor southern California,

general contractor southern California, grading southern California, concrete contractor, concrete southern California 

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OPTIMUS LOGISTICS

HEARTLAND RANCHO CUCAMONGA

I-5 WATER RELOCATION

OLIVIO EDINGER

OAKMONT HICKORY WAREHOUSE

SIERRA RIDGE

SYCAMORE HILLS PLAZA

IPT ARROW ROUTE

HUNTINGTON

BEACH

WALMART

RIDGECREST

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BEST EMPLOYEES IN THE INDUSTRY

GJ Gentry General Engineering Inc. is most proud of the people it employs. 

GJ Gentry General Engineering Inc

1297 W. 9th Street Upland, CA 91786

​

Phone: 909.693.3391

​

Mon. - 7am - 4pm

Tues. - 7am - 4pm

Wed. - 7am - 4pm

Thurs. - 7am - 4 pm

Fri. - 7am - 4pm

Sat. - CLOSED

Sun. - CLOSED