| Jb General Tree Service | Jorge Raul Berumen Moreno | jbgeneraltreeserviceoffice@gmail.com | (510) 589 6570 | Tree | San Leandro · Alameda County | — | — |
| Jbd Builders | David Martin Ramirez Vasquez | — | (510) 239 6542 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jbr Drywall INC | Bolanos Julio Hernandez | — | (510) 240 2277 | Other | Newark · Alameda County | — | — |
| Jc & E Electric INC | Julio Cesar Gabriel Coreas Vigil | colin@jceelectric.com | (650) 921 7088 | Electricians | Hayward · Alameda County | — | — |
| Jc Construction | Sui Dong Chen | — | (510) 600 3289 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Jc Green Plumbing INC | Huerta Jesus | — | (510) 366 3667 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Jc Plumbing & Rooter | Jc Plumbing & Rooter | — | (415) 947 9675 | Other | Hayward · Alameda County | — | — |
| Jc Pro Painting INC | Juan Carlos Espinoza Avila | — | (510) 415 6527 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Jcm Signature Designs LLC | Jose Cruz Martinez | — | (650) 448 9485 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Jcs Fire | Friesen Jerry | amkryukov@gmail.com | (925) 456 4151 | Other | Livermore · Alameda County | — | — |
| Jd Construction & Handyman Service | Jamey Edward Drury | — | (510) 755 2662 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Jd Energy Solutions INC | Jose Jr Deanda | info@jdenergysolutions.com | (408) 981 9527 | Electricians | Fremont · Alameda County | — | — |
| Jd Mobile Welding | Joseph David Borjon | — | (925) 640 9863 | Other | Livermore · Alameda County | — | — |
| Jdj Norcal Construction INC | Jong Dae Jo | — | (424) 402 2959 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jdl Construction | Jared Bradley Vick | — | (925) 344 7246 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Jdms Construction INC | Daniel Pelayo Renteria | — | (209) 321 8099 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Jds Design Build | Michael Kenneth Jeffery | — | (925) 292 9805 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Jdz Concrete INC | Jorge Arturo Diazurzua | — | (510) 407 5164 | Other | Castro Valley · Alameda County | — | — |
| Jed Building And Lighting LLC DBA Jed Construction | Denise Elaine Wharton-Morris | — | (415) 971 9800 | Electricians | Alameda · Alameda County | — | — |
| Jeff Stern | Jeff Stern | — | (925) 449 2053 | Other | Livermore · Alameda County | — | — |
| Jefferson Landscape And Design | Jefferson Landscape And Design | — | (510) 861 0944 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Jeffery Scott Silva | Jeffery Scott Silva | — | (510) 331 6937 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jeffrey Byron Jones | Jeffrey Byron Jones | — | (510) 530 9639 | Electricians | Oakland · Alameda County | — | — |
| Jeffrey E Bond | Jeffrey E Bond | — | (510) 200 7555 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Jeffrey Ward Cabinetmaker | Jeffrey Ward Cabinetmaker | — | (510) 610 3639 | Other | Berkeley · Alameda County | — | — |
| Jeloni Hughes Construction | Jeloni Anwar Hughes | — | (510) 557 8685 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Jem General Builder | Jem General Builder | — | (415) 670 0287 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jema And Company | Armando Gadiane Ferrer | — | (650) 592 7945 | HVAC | San Leandro · Alameda County | — | — |
| Jemby Electric INC | Benjamin Jonathan Craig | — | (510) 900 9505 | Electricians | Fremont · Alameda County | — | — |
| Jenks Gutters And Downspouts | Jenks Gutters And Downspouts | — | (510) 523 0897 | Other | San Lorenzo · Alameda County | — | — |
| Jennifer Brault Painting | Jennifer Brault Painting | hi@typemade.mx | (415) 577 9578 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Jennison Construction Co | Robert Jennison Maggy | kyle@jennisonconstruction.com | (925) 413 6383 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Jeppson Construction | Gregory Wayne Jeppson | — | (925) 784 3853 | Other | Livermore · Alameda County | — | — |
| Jepsen Electric INC | Moira Lisbeth Jepsen | — | (925) 455 0872 | Electricians | Livermore · Alameda County | — | — |
| Jerome And Horner Sheet Metal INC | Thomas Peter Le Clair | — | (510) 658 0471 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jesus & Sons Landscape Construction Co | Gonzalez Jesus Ramirez | — | (510) 825 7371 | Windows, patio, painters | Mt Eden · Alameda County | — | — |
| Jesus Flores Construction | Flores Jesus | — | (510) 760 7399 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Jesus Lara & Son's Roofing INC | Diaz Lara Gerardo | — | (510) 689 8057 | Other roofers | San Lorenzo · Alameda County | — | — |
| Jetton Construction INC | Michael Vanlokren | %20info@jettonconstruction.com | (510) 845 3506 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Jf Ruiz Construction | Jose Francisco Ruiz Ruiz | — | (510) 396 6384 | GC, remodel, ADU | Newark · Alameda County | — | — |