| Jlcon INC | Andrew Ko | — | (510) 366 5553 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jlm Builder INC | Kenny Chang Lu | — | (408) 318 2739 | Electricians | Dublin · Alameda County | — | — |
| Jm Painting And Refinishing | Jm Painting And Refinishing | — | (510) 314 4215 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Jm Welding Service INC | Juan Manuel Yanez | juan@jmwsinc.com | (510) 783 1800 | Other | Hayward · Alameda County | — | — |
| Jmc Electric | Herrera Jose Melvin | — | (510) 861 2508 | Electricians | Hayward · Alameda County | — | — |
| Jmcr Kitchens | Jmcr Kitchens | — | (408) 817 0584 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Jme Remodeling INC | Grigory Kalmanovich | — | (415) 499 2515 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jmf Builders | Jerry Michael Foster | info@jmfbuilders.com | (408) 401-7796 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jmls Corporation | Sun Min | — | (925) 399 2807 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Jmn Builder | Jmn Builder | — | (510) 688 0144 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jmv Tree Service Corp | Juan Manuel Rivera Valle | — | (510) 666 5402 | Tree | Hayward · Alameda County | — | — |
| Jns Construction | Prieto Perez Pedro | — | (408) 469 7854 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Jobco Paving INC | Joe Anthony Garnica | — | (949) 287 9136 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Joe French Construction | Joseph John French | — | (925) 591 6029 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Joe General Construction | Phuc Hong Nguyen | — | (510) 714 7165 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Joe Perri Tile | Joe Perri Tile | — | (510) 582 9938 | Other | Castro Valley · Alameda County | — | — |
| Joe's Construction INC | Jimmy Ng | info@joesconstruction.com | (858) 294-6868 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Joe's Roofing Service | Joseph Raymond Kopps | — | (925) 449 1658 | Other roofers | Livermore · Alameda County | — | — |
| Joel Carty | Joel Carty | — | (805) 895 3845 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Joes Construction & Plumbing | Jose Luis Ayquipa Flores | — | (510) 552 6209 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Joey Rose Painting Studio | Joey Rose Painting Studio | — | (530) 306 4364 | Windows, patio, painters | Emeryville · Alameda County | — | — |
| John A Broughton | John A Broughton | — | (510) 532 1645 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John Barni Construction | John Joseph Jr Barni | — | (510) 522 2230 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| John Bewall | John Bewall | — | (510) 284 7790 | Windows, patio, painters | Fremont · Alameda County | — | — |
| John C Moncher Construction | John Carl Moncher | — | (510) 536 7515 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John C Rogers Blacksmith | John C Rogers Blacksmith | — | (510) 388 6116 | Other | Oakland · Alameda County | — | — |
| John Carlos Carpet Workroom | John Carlos Carpet Workroom | — | (925) 783 7182 | Other | Oakland · Alameda County | — | — |
| John Chien Mai's Landscaping Service | Chien Xuan Mai | — | (510) 755 8748 | Windows, patio, painters | Hayward · Alameda County | — | — |
| John Coveney General Contractor | John Coveney General Contractor | — | (510) 501 7732 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| John Fitch Iii | John Fitch Iii | — | (925) 250 1616 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| John Galt Communications INC | Andrew Wayne Engstrom | — | (510) 914 6650 | Other | Hayward · Alameda County | — | — |
| John Gullak | John Gullak | — | (707) 688 1021 | Other | Hayward · Alameda County | — | — |
| John H Jacobsen | John H Jacobsen | — | (510) 378 6851 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John H Steib | John H Steib | — | (510) 816 9707 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John Harper - Millwork Solutions INC | John Phillip Harper | — | (925) 245 0473 | Other | Livermore · Alameda County | — | — |
| John Herman Gruninger Iii | John Herman Gruninger Iii | — | (415) 336 8145 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| John J Langon Jr | John J Langon Jr | — | (510) 541 0499 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| John Jensen | John Jensen | — | (510) 551 9638 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| John Kevin Medeiros | John Kevin Medeiros | — | (510) 331 3498 | Electricians | San Leandro · Alameda County | — | — |
| John L Franco Construction | John Louis Franco | — | (925) 587 6967 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |