| Ken Little Construction | Kenneth Dean Little | — | (510) 789 7994 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Ken Miks Construction | Kenneth Alan Sr Miks | — | (925) 800 5935 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Ken's Landscaping And Maintenance | Ken's Landscaping And Maintenance | — | (925) 548 3063 | Windows, patio, painters | Dublin · Alameda County | — | — |
| Kenji Construction | Mui Ken | — | (415) 341 7214 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Kenji Hasegawa | Kenji Hasegawa | — | (415) 269 1230 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Kenneth E Wright Ii | Kenneth E Wright Ii | — | (510) 501 1657 | Other | Fremont · Alameda County | — | — |
| Kenneth Jones | Kenneth Jones | — | (925) 558 5908 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Kenneth Lewis DBA Lewis Engineering | Kenneth Lewis DBA Lewis Engineering | — | (510) 778 5851 | Other | Piedmont · Alameda County | — | — |
| Kenneth Louis Robinson | Kenneth Louis Robinson | — | (510) 772 6793 | Electricians | Oakland · Alameda County | — | — |
| Kenneth R Mahaffey | Kenneth R Mahaffey | — | (510) 849 9876 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Kent Lau Construction Co | Kent Wai Lau | — | (510) 599 9323 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Kenwood Co | Chu Ken | — | (510) 701 8891 | Electricians | Oakland · Alameda County | — | — |
| Keo Construction | Oscar Fabian Espinoza | info@keoconstruction.com | (510) 325 7208 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Kera Tech | Bum Joo Kim | — | (925) 833 6054 | Other | Dublin · Alameda County | — | — |
| Kerry Taylor | Kerry Taylor | — | (925) 455 0224 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Kevin Chiang | Kevin Chiang | — | (510) 754 6467 | Electricians | Fremont · Alameda County | — | — |
| Kevin Murray Construction | Murray Kevin | — | (510) 351 3979 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Kevin R Construction | Kevin Raymond Young | — | (510) 595 1949 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Kevin Reimer Builder | Kevin Reimer Builder | — | (510) 220 1633 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Kevin Street Painting | Kevin Street Painting | — | (510) 750 6730 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Kevin Tseng | Kevin Tseng | — | (510) 919 8908 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Key Mechanical Company | Frank William Leonard | — | (925) 294 8111 | HVAC | Livermore · Alameda County | — | — |
| Key One Construction INC | Tony Jianzhong Feng | — | (510) 325 2998 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Keystone Home Improvements INC | Borowsky Manuel | manny@keystonehomeimprovementsinc.com | (510) 846 4021 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Kh Waterproofing And Restoration INC | Nicholas Elliott Koskinen | — | (510) 328 1682 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Kha Van Dinh | Kha Van Dinh | — | (510) 207 1299 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Khan Electrical Services LLC | Umair Khan Jadoon | — | (510) 516 4715 | Electricians | Fremont · Alameda County | — | — |
| Killen Enterprises INC | John Alexander Killen | — | (925) 292 5137 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Killen Mechanical INC | Joshua Alexander Killen | info@killenmechanical.com | (925) 364 0981 | HVAC | Livermore · Alameda County | — | — |
| Killian Construction | Patrick Noel Sullivan | — | (510) 919 2942 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Kim Hung Construction | Lau Kim Hung | kimhungconstruction@gmail.com | (510) 829 5856 | Electricians | San Lorenzo · Alameda County | — | — |
| Kim's General Construction | Kim Insu | — | (510) 299 1244 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Kinder Landscape | Kinder Landscape | — | (510) 598 5082 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Kinetics Mechanical Service INC | Craig Walter Kirk | — | (925) 245 6200 | HVAC | Livermore · Alameda County | — | — |
| Kinetics Mechanical Service INC | Craig Walter Kirk | — | (925) 245 6200 | Other | Livermore · Alameda County | — | — |
| King Crane Service | Brock Reid Jr Settlemier | — | (408) 452 1537 | Other | San Leandro · Alameda County | — | — |
| King Glass & Door INC | Nicholas Brian King | — | (510) 820 5801 | Windows, patio, painters | Hayward · Alameda County | — | — |
| King Son Construction Co LLC | Chanyan Joaquin | — | (510) 881 6531 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Kings Painting Company | Reyes Esteban Adolfo | interested@domainmarket.com | (510) 372 4553 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Kingston Plumbing Company LLC | Jason David Longacre | — | (415) 713 5155 | Other | Oakland · Alameda County | — | — |