| Jordan Mendez Construction INC | Jordan Ivan Maldonado Mendez | — | (415) 990 1074 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Jordan Sorrell Blind And Shutters | Jordan Sorrell Blind And Shutters | — | (925) 529 2069 | Other | Brentwood · Contra Costa County | — | — |
| Jordan Spaulding Construction | Jordan Michael Spaulding | — | (925) 787 5167 | GC, remodel, ADU | Crockett · Contra Costa County | — | — |
| Jorge A Aparicio | Jorge A Aparicio | — | (510) 224 8354 | Windows, patio, painters | El Sobrante · Contra Costa County | — | — |
| Jorge Chavez Drywall | Jorge Chavez Drywall | — | (510) 367 6090 | Other | San Pablo · Contra Costa County | — | — |
| Jorge Lopez Roofing INC | Lopez Mendoza Jorge | — | (415) 823 9013 | Other roofers | El Sobrante · Contra Costa County | — | — |
| Jorge Ocampo Landscaping | Jorge Ocampo Landscaping | — | (510) 860 7632 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Jorge Sanchez Montajano | Jorge Sanchez Montajano | — | (925) 348 0929 | Windows, patio, painters | Oakley · Contra Costa County | — | — |
| Jose & Son Construction INC | Jose Santos Zavala Bolanos | — | (415) 205 5450 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Jose A Madriz Tree Service | Jose Antonio Madriz | — | (510) 685 9076 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Jose Carrasco Plumbing DBA Jc Plumbing | Jose Estevan Carrasco | — | (510) 978 2357 | Other | Pinole · Contra Costa County | — | — |
| Jose Castanon | Jose Castanon | — | (925) 297 7023 | Other roofers | Bay Point · Contra Costa County | — | — |
| Jose David Mendoza | Jose David Mendoza | — | (415) 577 3336 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Jose Espinoza Painting | Jose Espinoza Painting | — | (510) 734 0300 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Jose G Tlachi Flores | Jose G Tlachi Flores | — | (510) 631 4642 | Other | San Pablo · Contra Costa County | — | — |
| Jose Luis Gonzalez | Jose Luis Gonzalez | — | (925) 864 3735 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Jose Navarro Painting INC | Jose Arnold Navarro | — | (415) 302 6049 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Jose Negrete | Jose Negrete | jose@jose-negrete.com | (925) 695 4730 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Jose Saucedo Roofing | Jose G Saucedo | — | (925) 437 6934 | Other roofers | Brentwood · Contra Costa County | — | — |
| Jose Ulises Gonzalez | Jose Ulises Gonzalez | — | (925) 521 4493 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Joseph A Grupalo | Joseph A Grupalo | — | (707) 474 2008 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Joseph Cleberg | Joseph Cleberg | — | (510) 758 7385 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Joseph D De Vito Construction | Joseph Domenic Ii Devito | — | (925) 518 4059 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Joseph H Lauterbach DBA Jhl Construction | Joseph Harold Lauterbach | — | (408) 613 8580 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Joseph J Falkowski | Joseph J Falkowski | — | (925) 698 1174 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Joseph Loescher Landscapes | Joseph Loescher Landscapes | — | (925) 389 0627 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| Joseph P Walsh DBA Walsh Construction Co | Joseph Patrick Walsh | — | (925) 855 1555 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Joseph S Siino | Joseph S Siino | — | (925) 432 4642 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Joseph Terence Interiano DBA Bumble Bee Construction | Joseph Terence Interiano | — | (510) 701 3967 | Other | Pinole · Contra Costa County | — | — |
| Joseph Ward General Contractor | Joseph Ward General Contractor | — | (925) 356 8810 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Josh Swanson Construction Company | Ralph B Jr Swanson | — | (925) 876 5681 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Joshua General Construction Corp | Gabriel O Ark-Majiyagbe | — | (510) 372 4185 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Jot Charlot | Jot Charlot | — | (925) 788 1027 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Journeyman Level Telecom INC | Jeffery Alan Bremhorst | — | (925) 437 3454 | Other | Oakley · Contra Costa County | — | — |
| Jp Construction & Painting INC | Jose Eusebio Perez Lopez | — | (415) 336 2519 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Jp Electric | Thomas Patrick Mullen | info@jp-electric.com | (925) 914 7108 | Electricians | Martinez · Contra Costa County | — | — |
| Jp General Construction Services INC | Ervin Geovani Parada-campos | jpgeneralcservises1@gmail.com | (925) 437 0818 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Jprl Glass | Jprl Glass | — | (925) 308 9500 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Jq Kitchen And Bath | Yu Jianqiang | — | (415) 999 9783 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Jr Electric & Service LLC | Juan Antonio Rosales Mencos | — | (925) 390 5377 | Electricians | Brentwood · Contra Costa County | — | — |