| K C Wu Construction | Joe K C| Wu Kuanche Wu | — | (510) 364 8964 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| K D Kenny Builders | Kevin Daniel Kenny | — | (925) 383 9422 | GC, remodel, ADU | Sunol · Alameda County | — | — |
| K D M Construction | Kerry David Mueller | — | (925) 640 8844 | Electricians | Pleasanton · Alameda County | — | — |
| K D W Construction LLC | Duncan Joseph Woods | — | (925) 493 8940 | Other | Livermore · Alameda County | — | — |
| K Development Company | Jose Gabriel Bonilla Gomez | — | (415) 684 5512 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| K G Construction | Gans Kenneth | kyle@kgconstruction.com | (415) 756 0794 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| K Gonzy Floors | K Gonzy Floors | — | (510) 823 7262 | Other | Oakland · Alameda County | — | — |
| K I Woodworks | K I Woodworks | kiwdwks@gmail.com | (510) 352 5299 | Other | San Leandro · Alameda County | — | — |
| K J Hart Electric And Son INC | Kenneth James Hart | — | (925) 462 0591 | Electricians | Pleasanton · Alameda County | — | — |
| K K Builders | K K Builders | — | (510) 501 3305 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| K M Mcrae INC | Joan Yvonne Mc Rae | — | (510) 537 6539 | Other | Hayward · Alameda County | — | — |
| K M S Construction | Kenneth Ka-ming Tam | — | (415) 760 9255 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| K N Construction | Cuong Kenny Nguyen | — | (510) 292 1489 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| K R T INC | Jacob Dean Trout | — | (925) 485 7943 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| K Reed Roofing | Kirby Orban Reed | — | (510) 357 5116 | Other roofers | San Leandro · Alameda County | — | — |
| K S M Construction | Kyle Sander Mercer | — | (970) 331 1506 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| K S Y C Construction | Kenneth Shek Yuen Chin | — | (510) 881 3597 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| K V Schneider Const | K V Schneider Const | — | (925) 829 1971 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| K Y Construction | Yang Ken | — | (510) 717 5417 | Electricians | San Leandro · Alameda County | — | — |
| K Z Construction Co | Kifle Woldegebreal Zereat | — | (510) 387 9041 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| K&m Properties INC | Kevin Santiago Molano Galan | — | (925) 337 6837 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| K2 Appliance Installation | Hendra Christianus | — | (510) 255 5831 | Other | Oakland · Alameda County | — | — |
| Kaelin Construction INC | Mitchell Donald Kaelin | info@kaelininc.com | (925) 461 4301 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Kai Design And Build | Kai Design And Build | — | (510) 829 9610 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Kaitz Construction General Contractor | Richard Brian Kaitz | — | (209) 896 5187 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Kaixuan Construction | Wang Chongwang | — | (650) 889 8085 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Kali Builders Construction INC | Farhad Azizi | — | (408) 506 5286 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Kami Construction INC | Misaghi Kamran | — | (510) 867 4030 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Kanalakis Const | Kanalakis Const | — | (925) 596 0020 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Kanaya Consulting & Contracting | Douglas Kiyoshi Kanaya | — | (925) 890 2525 | Other | Pleasanton · Alameda County | — | — |
| Kanell's Painting Services | Rene Alfredo Lopez | — | (510) 502 5483 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Kanger Kin Chung Shum | Kanger Kin Chung Shum | — | (510) 219 8675 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Kannon Construction LLC | Amy Michelle Anderson | — | (415) 724 5458 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Karajen Construction Services | Guy Elmo Wilkinson | — | (510) 333 6226 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Kares Construction INC | Frank John Kares | — | (925) 243 6640 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Karl Kardel Company INC | Allyson Leora Tynes-kardel | — | (510) 261 4149 | Other roofers | Oakland · Alameda County | — | — |
| Karl Macrae Consulting | Karl Macrae Consulting | — | (510) 852 1671 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Kasbrook INC | Anthony Ramirez | bids@kasbrook.com | (510) 410 1026 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Kasta Floors Contractors INC | Jose Tomas Rivas Gonzalez | — | (650) 533 5739 | Other | Hayward · Alameda County | — | — |
| Kastle Systems Of Los Angeles Partnership | James Jeffrey Graber | — | (703) 528 8800 | Electricians | Fremont · Alameda County | — | — |