| Kinnon Builders | Kinnon Builders | — | (510) 790 1480 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Kirby Cabinetry | Kirby Cabinetry | steve@kirbycabinetry.com | (510) 919 8557 | Other | Berkeley · Alameda County | — | — |
| Kirby Tree Service | Fredrick Moyne Kirby | — | (510) 785 0856 | Tree | Hayward · Alameda County | — | — |
| Kirkstone Construction | Andrew John Wright | — | (510) 230 8524 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Kirsten Brice INC | Kirsten Kimberly Brice | — | (510) 393 4515 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Kis | Todd William Schmitzer | — | (510) 403 7500 | Other | Fremont · Alameda County | — | — |
| Kitchen Bath & Beyond INC | Omar Chouari | — | (510) 468 7046 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Kitchen Experts Of Pleasanton LLC | Mitchell Brooks Mcgrath | — | (925) 362 8300 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Kitchen Fantastic | John Joseph Lupo | info@kitchenfantastic.com | (925) 667 4133 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Kj Electric | Kevin James Kinney | — | (510) 919 7056 | Electricians | Alameda · Alameda County | — | — |
| Klaus Multiparking INC | Richard Robert Rombach | info@multiparking.com | (925) 284 2092 | Electricians | Berkeley · Alameda County | — | — |
| Klf Construction INC | Kevin Lee Field | — | (510) 209 0115 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Klondike Construction | David Andrew Lekashman | — | (510) 207 0935 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Km Squared | Km Squared | — | (925) 785 1046 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Kmm Construction LLC | Haris Yousef Khan | — | (510) 861 7700 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Knight Roofing Services INC | David Alan Rice | — | (510) 438 9077 | Other roofers | Fremont · Alameda County | — | — |
| Knox Sewer And Backhoe Service INC | Isiah Jr Knox | — | (510) 712 5068 | Other | Oakland · Alameda County | — | — |
| Kobban Builders | Kobban Builders | — | (510) 228 7924 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Koch & Associates INC | Garrett Lee Koch | — | (510) 490 0487 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Kodati Homes LLC | Samuel Anand Kodati | — | (415) 761 1111 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Koffler Electrical Mechanical Apparatus Repair INC | Hilaria Ann Koffler | — | (510) 567 0630 | Electricians | San Leandro · Alameda County | — | — |
| Konnectpro Designers & Builders INC | Firas Abddulwadoud Jandali | — | (916) 623 5776 | Other | Fremont · Alameda County | — | — |
| Konshion Construction INC | Ming Sit | — | (925) 201 3948 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Kopper Electrical Solutions INC | Ivan Missael Pina Lopez | — | (510) 508 6371 | Electricians | San Lorenzo · Alameda County | — | — |
| Korfhage Construction | Mark Delisle Korfhage | — | (650) 454 6239 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Koto Construction | Curtis Lee Ikemoto | — | (415) 637 7816 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Kozuki Landscaping | Muoc Van Nguyen | — | (510) 813 4247 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Kp Doors & Access LLC | Kendric Vaughn Powell | — | (510) 361 0400 | Other | Hayward · Alameda County | — | — |
| Kp Landscaping | An Qui Pham | kplandscaping98395@gmail.com | (510) 384 3068 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Kr Sustainable Structures INC | Kathleen Marie Rai | — | (510) 974 1972 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Kraftmanship Carpentry | Kraftmanship Carpentry | — | (510) 206 5664 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Kreo Construction | Luis Espinoza Ayala | — | (510) 563 0280 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Kris Construction | Mulia Krishlani | — | (408) 835 6620 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Kukahiko INC | John Joseph Nephi Kukahiko | — | (925) 337 7783 | Electricians | Livermore · Alameda County | — | — |
| Kvc Construction INC | Chuanchuan Wang | — | (626) 295 9625 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Kw Pacific Builders INC | Kewang Xu | — | (510) 458 1177 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Kw Pacific Construction Company | Xu Kewang | — | (510) 458 1177 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Kwan Li Investment A Partnership | Kwan Hong Li | — | (415) 518 7572 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Kwan Wo Ironworks INC | Eric Kai Suen Mao | — | (510) 487 9628 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Kwh Painting Service | Kemper Winston Hardy | — | (510) 927 8489 | Windows, patio, painters | Oakland · Alameda County | — | — |