| John L Sporich | John L Sporich | — | (510) 654 7454 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John M Forster | John M Forster | — | (510) 832 3841 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John M Jameson Construction INC | John Michael Jameson | john@jamesoncontractors.com | (510) 749 8363 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| John Mark Schmidt | John Mark Schmidt | — | (510) 561 8488 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| John Mc Donagh Builders And Energy Systems | John Joseph Mc Donagh | — | (707) 567 5246 | HVAC | Castro Valley · Alameda County | — | — |
| John Paul O Brien Construction | John Paul O Brien | — | (510) 757 1114 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John R Carpenter Construction | John Rodolph Carpenter | — | (510) 550 0013 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| John Rix | John Rix | — | (510) 432 1016 | Electricians | Hayward · Alameda County | — | — |
| John Rogers Construction | John Joseph Rogers | — | (510) 706 0199 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| John Thomas Daley | John Thomas Daley | — | (925) 336 1265 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| John V Rosa | John V Rosa | — | (510) 301 4710 | GC, remodel, ADU | Newark · Alameda County | — | — |
| John Van Krieken Glazing Contractor | John Van Krieken Glazing Contractor | — | (510) 465 1375 | Windows, patio, painters | Alameda · Alameda County | — | — |
| John W Ellis | John W Ellis | — | (510) 600 5434 | Other | Union City · Alameda County | — | — |
| John Zeng Yuan Xu | John Zeng Yuan Xu | — | (510) 579 2353 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Johnson Construction | Willie Fred Johnson | — | (510) 828 4773 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Johnson Painting & Decorating | Johnson Painting & Decorating | — | (925) 918 2444 | Windows, patio, painters | Pleasanton · Alameda County | — | — |
| Johnson's Insulation | Christopher Thomas George | hampshire@jisltd.com | (510) 660 0455 | HVAC | Oakland · Alameda County | — | — |
| Joinery Structures | Gregory John Reeb | — | (510) 545 2949 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jon Wilson Construction | Jonathan Daniel Wilson | — | (510) 387 4548 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Jonathan Maier Plumbing Contractor | Jonathan Maier Plumbing Contractor | — | (510) 220 4376 | Other | Berkeley · Alameda County | — | — |
| Jones & Sheilds Enterprises INC | Marc Desean Jones | — | (510) 706 1304 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Jones Tile And Marble INC | Jones Frederick | — | (510) 915 3279 | Other | Oakland · Alameda County | — | — |
| Jordan Callier Construction | Jordan Michael Callier | callierjordan@yahoo.com | (510) 566 3800 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Jos Construction INC | Ramos Agustin Lopez | typesetit@att.net | (415) 867 8396 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jose Melkis Guandique | Jose Melkis Guandique | — | (415) 797 9164 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Jose Reyes Martin | Jose Reyes Martin | — | (510) 365 2474 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jose's Concrete | Jose's Concrete | — | (510) 750 3030 | Other | Union City · Alameda County | — | — |
| Joseph Langon | Joseph Langon | — | (510) 517 8640 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Joseph Mccauley Electric | Joseph Edward Mccauley | — | (510) 316 5086 | Electricians | Oakland · Alameda County | — | — |
| Joseph Michael Stevens | Joseph Michael Stevens | — | (925) 570 4921 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Joseph Myles Duran Landscaping LLC | Joseph Myles Duran | — | (510) 967 5165 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Joseph R Silva | Joseph R Silva | — | (510) 909 0007 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Joseph Schmitz | Joseph Schmitz | — | (925) 784 5022 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Joseph Shumpert | Joseph Shumpert | — | (818) 738 5460 | Other | Dublin · Alameda County | — | — |
| Joseph Tezeno Jr | Joseph Tezeno Jr | — | (510) 919 8239 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Joshua Demillo | Joshua Demillo | — | (925) 964 7184 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Joshua Paul Ludden | Joshua Paul Ludden | — | (510) 226 6168 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jowi Junsay | Jowi Junsay | — | (510) 766 9565 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Jp Construction Builders | Jose Luis Perez | — | (510) 813 5054 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Jp Dean INC | Joseph Paul Dean | — | (510) 715 4727 | Other roofers | Pleasanton · Alameda County | — | — |