| J & J Concrete Construction INC | Juan Jaime Hermosillo | — | (925) 245 9237 | Other | Livermore · Alameda County | — | — |
| J & J Pro Builders INC | Edward Leon | — | (510) 828 2003 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J & J The Siding Experts INC | Juan Manuel Hernandez-Espinoza | — | (510) 697 4282 | Other | San Leandro · Alameda County | — | — |
| J & L Communications | J & L Communications | — | (925) 570 1126 | Other | Dublin · Alameda County | — | — |
| J & M Construction | James Michael Durden | info@jmconstruction.com | (805) 472-2400 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| J & M Gutter Services | John Manuel Silva | — | (570) 770 8515 | Other | Fremont · Alameda County | — | — |
| J & M INC | Manuel Iv Marques | — | (925) 724 0300 | Other | Livermore · Alameda County | — | — |
| J & R Home Repair & Remodeling | James Joesph Hamilton | — | (925) 455 6532 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J & R Smith Construction | John Frederick Smith | — | (510) 882 2962 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J & T Landscaping | J & T Landscaping | — | (510) 409 0221 | Windows, patio, painters | Hayward · Alameda County | — | — |
| J & W Construction INC | Yan Y Mei | — | (510) 853 5093 | Electricians | Hayward · Alameda County | — | — |
| J A Anonas | J A Anonas | — | (510) 326 3653 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| J A B Construction | Jaime Arturo Bocanegra | — | (510) 978 9572 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| J A Landscapes | J A Landscapes | — | (510) 938 7165 | Windows, patio, painters | Hayward · Alameda County | — | — |
| J A M Construction | Jose Alberto Martinez | — | (925) 339 8080 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| J Allen Builders | J Allen Builders | — | (925) 464 0864 | GC, remodel, ADU | Newark · Alameda County | — | — |
| J And Q Construction | Nhattruong Trung Truong | — | (510) 918 1818 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| J Arroyo's Construction | Jose Luis Arroyo Becerra | — | (209) 675 8313 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J B Signs INC | Jeffery Thomas Bennett | — | (510) 750 5857 | Other | San Lorenzo · Alameda County | — | — |
| J Building INC | Zhongmin Liu | — | (510) 676 8664 | GC, remodel, ADU | Union City · Alameda County | — | — |
| J C 2 Glass Shower Door & Mirrors INC | Juan Carlos Escobar | — | (510) 690 5920 | Windows, patio, painters | Hayward · Alameda County | — | — |
| J C Builders | J C Builders | — | (510) 588 0805 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| J C Electric | Jorge Pedro Campos | — | (650) 333 9839 | Electricians | Hayward · Alameda County | — | — |
| J C Flooring | J C Flooring | — | (510) 557 5589 | Other | Hayward · Alameda County | — | — |
| J C P Construction INC | John Chuck Pang | — | (510) 387 8922 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J C Prospective Construction INC | Jian Ping Chen | — | (510) 333 3986 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J C W Construction | Jeremy Charles West | — | (925) 292 5885 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J Carrillo Plumbing And Drains | J Carrillo Plumbing And Drains | — | (510) 688 2597 | Other | Hayward · Alameda County | — | — |
| J D A Construction INC | William Albert Jr Esperson | — | (510) 825 2216 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| J D Cahill Electric | Joseph Daniel Jr Cahill | — | (925) 525 5982 | Electricians | Livermore · Alameda County | — | — |
| J D Custom Cabinets | J D Custom Cabinets | hi@typemade.mx | (510) 281 6540 | Other | Newark · Alameda County | — | — |
| J D General Construction INC | Heidi Christine Jeffers | — | (925) 449 4354 | HVAC | Livermore · Alameda County | — | — |
| J D Hutchinson Construction | James Daniel Hutchinson | — | (925) 766 3479 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| J D Landscaping | J D Landscaping | — | (925) 606 1700 | Windows, patio, painters | Livermore · Alameda County | — | — |
| J D Lopez Construction | Jesus Dario Lopez | — | (650) 333 0775 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| J D Partners Concrete | Eggert Construction Jason | — | (510) 501 8967 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| J D S Acoustics | J D S Acoustics | — | (925) 605 7337 | Other | Livermore · Alameda County | — | — |
| J D W Enterprises INC | Justin Douglas Wallway | — | (510) 698 6610 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| J David Ford Construction | John David Ford | — | (510) 845 9076 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| J E Moore Air Conditioning INC | Jodee Moore | — | (925) 462 9222 | HVAC | Pleasanton · Alameda County | — | — |