| Kenneth R Lind | Kenneth R Lind | — | (510) 233 8265 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Kenneth Wayne Knifsend | Kenneth Wayne Knifsend | — | (925) 759 8542 | Other | Antioch · Contra Costa County | — | — |
| Kenney Construction | David Christian Kenney | info@kenneyconstruction.com | (925) 899 8656 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Kenney Construction | Kenney William | info@kenneyconstruction.com | (925) 890 2151 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Kensington Painting | Kensington Painting | — | (510) 558 6898 | Windows, patio, painters | Kensington · Contra Costa County | — | — |
| Kensington Roofing | Steven Wayne Johnson | — | (510) 524 2925 | Other roofers | Kensington · Contra Costa County | — | — |
| Kent Boettcher | Kent Boettcher | — | (925) 360 4039 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Kent Painting & Finishing INC | Kristopher Rodney Kent | — | (510) 508 4654 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Kentco Construction | Richard Lewis Kent | — | (916) 716 1021 | GC, remodel, ADU | Bethel Island · Contra Costa County | — | — |
| Kepkee Construction | Brian Francis| Kepkee Brian Koepke | — | (925) 260 4332 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Kepkee Construction INC | Brian Francis Koepke | — | (925) 260 4332 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Kepper INC DBA Remodeling Construction Services | Veaceslav Chiper | — | (415) 937 2799 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| Kerex Engineering INC | Patrick Richard Madden | — | (925) 387 8913 | Other | Lafayette · Contra Costa County | — | — |
| Kevco Refinishing | Kevco Refinishing | — | (925) 755 2772 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Kevin Francis Rafferty Electric | Kevin Francis Rafferty | — | (415) 933 4071 | Electricians | San Ramon · Contra Costa County | — | — |
| Kevin K Chung | Kevin K Chung | — | (510) 847 6368 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Kevin Kechely | Kevin Kechely | — | (510) 415 3125 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Kevin M. Sullivan & Associates INC | Kevin Michael Sullivan | — | (925) 825 5625 | HVAC | Pacheco · Contra Costa County | — | — |
| Kevin Starrett DBA Advanced Electric | Kevin Daniel Starrett | — | (510) 812 5943 | Electricians | Martinez · Contra Costa County | — | — |
| Kevin W Keene DBA K & J Electric | Kevin William Keene | — | (925) 206 5023 | Electricians | Concord · Contra Costa County | — | — |
| Kevin's Flooring Company | Kevin Daniel Box | — | (925) 260 3763 | Other | Bethel Island · Contra Costa County | — | — |
| Kevin's Painting And Plumbing | Kevin's Painting And Plumbing | — | (925) 324 3195 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Keyrenter Contra Costa Property Management | Keyrenter Contra Costa Property Management | — | (925) 433-7777 | Property managers | San Ramon · Contra Costa County | — | — |
| Keystone Cm Partners INC | Parinaz Aghili | — | (707) 344 6734 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Keystone Masonry | Keystone Masonry | james@keystonemasonry.com | (406) 749 8902 | Other | Danville · Contra Costa County | — | — |
| Kg Drywall | Kg Drywall | — | (925) 207 7675 | Other | Antioch · Contra Costa County | — | — |
| Kg Electric | Kevin Michael Goodrich | — | (925) 521 4713 | Electricians | Concord · Contra Costa County | — | — |
| Khoixa Construction INC | Khoi Anh Xa | — | (415) 994 0856 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Khweled & Khweled INC | Mostafa A Khweled | — | (408) 210 4601 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Kian Electric | Malekzadeh Kian | — | (925) 451 8226 | Electricians | Bay Point · Contra Costa County | — | — |
| Kickfire Construction L P | William Otto Huchton | — | (888) 234 1231 | Pool | Brentwood · Contra Costa County | — | — |
| Kilcolgan Construction | Gerard Joseph Hynes | — | (510) 970 7995 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Kinao Electric | Armando Mario Portillo Rodriguez | — | (925) 332 8840 | Electricians | Antioch · Contra Costa County | — | — |
| King Kong Construction | Ming Kong Lam | — | (925) 381 9848 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| King's Plumbing | King's Plumbing | — | (925) 305 1215 | Other | Concord · Contra Costa County | — | — |
| King's Pools | King's Pools | — | (925) 212 0789 | Pool | Concord · Contra Costa County | — | — |
| Kingdom Concrete_contractor | Kingdom Concrete_contractor | — | (510) 230 4807 | Other | Richmond · Contra Costa County | — | — |
| Kingdom Electric INC | Ayala Alvarez Rodolfo | interested@domainmarket.com | (510) 394 8069 | Electricians | Antioch · Contra Costa County | — | — |
| Kingstone Paver Service | Carlos Alberto Jr De Almeida | — | (925) 567 4608 | Other | Concord · Contra Costa County | — | — |
| Kiowa Construction INC | Kelly Duane Klute | — | (925) 209 6610 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |