| Jp Gorilla Home Innovation Construction LLC | Jose Enrique Mendoza Pablo | — | (602) 500 6633 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jp Standard Company | Santos Julio Perez Martinez | — | (888) 502 6060 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Jp Sunset General Construction INC | Jose Candido Pereznegron Mata | — | (650) 743 5985 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jpmintegral Construction | Pablo Martin Juan | — | (510) 384 5425 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jpz Construction LLC | Gerardo Perez | — | (415) 624 5175 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Jpz Lath & Plastering | Jpz Lath & Plastering | — | (415) 941 8354 | Other | Oakland · Alameda County | — | — |
| Jr Construction And Remodeling INC | Jose Roberto Rodriguez | — | (510) 395 2905 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Jr Plumbing | Jr Plumbing | admin@jr-plumbing.com | (510) 706 2388 | Other | Hayward · Alameda County | — | — |
| Jrm General Contractor INC | Jose Roberto Mendiola | — | (925) 848 6441 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Jrmk Construction LLC | Jose Manuel Gonzalez | — | (510) 334 5783 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Js Company | Darin Todd Jackson | — | (415) 460 2100 | Other | Emeryville · Alameda County | — | — |
| Jt Air Control | Jt Air Control | — | (510) 456 6831 | HVAC | San Leandro · Alameda County | — | — |
| Jt Builders Group INC | Shang Wenqiang | — | (510) 858 6666 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jt Electrical Construction | Wen Jintang | — | (415) 579 7470 | Electricians | San Leandro · Alameda County | — | — |
| Juan Carlos Lopez Painting | Juan Carlos Lopez Painting | — | (510) 712 8574 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Juan M Lambarena | Juan M Lambarena | — | (510) 435 4494 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Juarez Construction | Juarez Ixcoy Job | — | (510) 706 9486 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Julie A Stonehouse | Julie A Stonehouse | — | (510) 207 2721 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Julie Chau | Julie Chau | — | (510) 396 9278 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Julio Castillo | Julio Castillo | — | (510) 754 9416 | Other | San Lorenzo · Alameda County | — | — |
| Jun's Construction | Huang Jun | — | (510) 853 5093 | Electricians | Hayward · Alameda County | — | — |
| Junction Scaffold Services INC | Rose Marie Looney | — | (510) 703 6735 | Other | Oakland · Alameda County | — | — |
| June York | June York | — | (510) 886 2157 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Junzel Construction | Lazaro Esguerra Pineda | — | (510) 761 1026 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Just Plumbing INC | Stephen Joseph Smith | — | (510) 754 2630 | Other | Castro Valley · Alameda County | — | — |
| Just Water Heaters And Plumbing | Just Water Heaters And Plumbing | proteam@mopro.com | (510) 676 3771 | Other | Fremont · Alameda County | — | — |
| Just Wright Constructinon INC | Joe Nathan Williams | — | (510) 697 0770 | Electricians | Oakland · Alameda County | — | — |
| Justar Construction INC | Daniel Waikim Wong | — | (510) 693 5635 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Justin L Leslie | Justin L Leslie | — | (707) 889 3939 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Justin Swiers | Justin Swiers | — | (925) 487 6913 | Other | Pleasanton · Alameda County | — | — |
| Jv Home Builders INC | Francisco Javier Aguilar | — | (415) 419 7156 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Jy General Construction | Yu Jacky | — | (510) 502 9681 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Jzl Construction | Liu Qi | jzlconstruction85@gmail.com | (650) 750 6666 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| K & E Kitchen & Bath INC DBA Today's Kitchen & Bath | Eddie Ray Juarez | — | (925) 523 7114 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| K & K Builder INC | Kenneth Chi Kun Lam | — | (510) 220 0988 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| K & Q Construction | Hui Gao | — | (408) 210 2519 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| K B Systems | K B Systems | — | (510) 687 9096 | Electricians | Fremont · Alameda County | — | — |
| K C Construction | Kevin Yiping Chan | — | (510) 882 0480 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| K C Kerry Construction INC | Casey John Kerry | — | (510) 610 5325 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| K C L Construction | Chang Yong Kim | — | (650) 922 1582 | GC, remodel, ADU | Hayward · Alameda County | — | — |