| J Ella & Co | Julito Demesa Iii Ella | — | (415) 857 5976 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| J F K Builders | J F K Builders | — | (510) 377 1856 | HVAC | Fremont · Alameda County | — | — |
| J F Plumbing INC | Joel Stephen Firestone | — | (925) 579 2844 | Other | Livermore · Alameda County | — | — |
| J F Remodeling And Handyman Services | Jose Ambrosio Flores Mejia | — | (925) 378 1080 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| J Fitzsimmons Building INC | Jeffrey Richard Fitzsimmons | — | (512) 705 8870 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J G P Painting | J G P Painting | — | (510) 394 7917 | Windows, patio, painters | Oakland · Alameda County | — | — |
| J G R Construction | Joe Garcia Rosa | — | (925) 200 6427 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J H Fitzmaurice INC | Mohammad Reza Hakimi | — | (510) 444 7561 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J H Mejia Construction And Remodeling | Julio Humberto Mejia | — | (510) 414 4426 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J Hawk Construction INC | Jeffrey Brian Helberg | impallari@gmail.com | (925) 294 4400 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J Hucks Home Improvement | J Hucks Home Improvement | — | (510) 918 4809 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| J I Metal Works | J I Metal Works | — | (510) 484 9691 | Other | San Leandro · Alameda County | — | — |
| J J & J Landscape Management INC | Steven Van Chau | — | (510) 396 6945 | Windows, patio, painters | Fremont · Alameda County | — | — |
| J J Commercial Water Heaters | Richard Julius Gutierrez | — | (510) 783 6851 | HVAC | Hayward · Alameda County | — | — |
| J J Marble Fabrication & Installation | Edin Arnoldo Mayen | — | (650) 906 8984 | Other | Castro Valley · Alameda County | — | — |
| J J Painting & Decorating | J J Painting & Decorating | — | (510) 938 6402 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| J J Rooter & Plumbing | J J Rooter & Plumbing | — | (510) 253 9673 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| J L Sims Plumbing Contractors | James Louis Sims | — | (916) 670 4778 | Other | Berkeley · Alameda County | — | — |
| J M A Builders | J M A Builders | jmabuild@yahoo.com | (925) 337 3299 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J M C Electric | Martinez Castrejon Juan | — | (415) 481 7297 | Electricians | Oakland · Alameda County | — | — |
| J M Campbell Company INC | Laurie Ann Huckins | — | (510) 533 2044 | HVAC | Oakland · Alameda County | — | — |
| J M Electric | John Michael Merriman | — | (510) 295 5765 | Electricians | Oakland · Alameda County | — | — |
| J M Family Construction INC | Mary Magdalena Mendoza | — | (510) 292 5508 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| J M Glass INC | Jose Morales | — | (510) 441 1041 | Windows, patio, painters | Hayward · Alameda County | — | — |
| J M O'neill INC | Anthony Joseph Mcguire | info@jmoneill.com | (925) 225 1200 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J M V Construction INC | Jose Manuel Vazquez | — | (510) 385 4978 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J Machado INC | Filomena Simao Machado | geral@j-machado.com | (510) 782 9432 | GC, remodel, ADU | Newark · Alameda County | — | — |
| J Man's Builders INC | Manases Lanzarrote Defiesta | — | (650) 826 9890 | GC, remodel, ADU | Union City · Alameda County | — | — |
| J Master Koatings | J Master Koatings | — | (510) 861 6875 | Windows, patio, painters | Hayward · Alameda County | — | — |
| J Mata Hauling INC | Norma Gabriela Guerrero | jmhauling1@yahoo.com | (510) 468 9660 | Other | Newark · Alameda County | — | — |
| J N Builder LLC | Jigar Dilip Gandhi | — | (408) 499 9048 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| J N G Pipeline Construction INC | Jose De Jesus Noriega Gonzalez | — | (510) 932 7503 | Other | Hayward · Alameda County | — | — |
| J N P Custom Builders INC | John Ferreira De Avila | — | (510) 537 3242 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| J O Construction | Jaime Arturo Ochoa Hernandez | — | (650) 218 0849 | GC, remodel, ADU | Newark · Alameda County | — | — |
| J O Roofing Co | Juan Manuel Ortiz | — | (415) 309 3742 | Other roofers | Hayward · Alameda County | — | — |
| J O'connor Construction | Jonathan David O'connor | — | (510) 501 0166 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J P A Landscape & Construction INC | Christopher James Drossulis | — | (925) 960 9602 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| J P Landscaping | J P Landscaping | — | (510) 755 5916 | Windows, patio, painters | Hayward · Alameda County | — | — |
| J P Painting | J P Painting | — | (415) 813 7035 | Windows, patio, painters | Newark · Alameda County | — | — |
| J R Concepts Landscape Contrctors | J R Concepts Landscape Contrctors | — | (925) 525 8064 | Windows, patio, painters | Livermore · Alameda County | — | — |