| K Deetken Construction | Kyle Andrew Deetken | — | (415) 342 9579 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| K G Masonry | K G Masonry | — | (707) 523 0792 | Other | Santa Rosa · Sonoma County | — | — |
| K G Walters Construction Co INC | Peggy Ann Reynoso | — | (707) 527 9968 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| K J K Construction | Kieran John Jr Keaney | — | (707) 753 0628 | Other | Rohnert Park · Sonoma County | — | — |
| K J M Construction | Kirk John Malley | — | (707) 480 5228 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| K Kinahan Construction Co | Kevin Patrick Kinahan | — | (707) 203 1308 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| K L B Construction | Kyle Lloyd Barnes | info@klbconstruction.com | (707) 888 0314 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| K L W Construction | Kim Lawrence Werly | — | (707) 773 1535 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| K M Insulation | K M Insulation | — | (707) 292 6409 | Other | Rohnert Park · Sonoma County | — | — |
| K P Lely Co INC | Kevin Peter Lely | — | (707) 529 4740 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| K Young Construction | Keith David Young | — | (707) 332 5006 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| K&a Espinoza Concrete INC | Jose Manuel Espinoza Nieto | contact@kaespinozaconcrete.com | (707) 758 9599 | Other | Santa Rosa · Sonoma County | — | — |
| Kalilson Construction & Remodeling | David Wayne Kalil | — | (707) 484 3741 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Kamron Yedlosky Construction | Kamron Jashak Yedlosky | — | (707) 486 6495 | GC, remodel, ADU | Graton · Sonoma County | — | — |
| Kanan's Tile | Kanan's Tile | — | (707) 849 4044 | Other | Windsor · Sonoma County | — | — |
| Kane & Associates | Timothy Preston Kane | — | (707) 975 7054 | Other | Santa Rosa · Sonoma County | — | — |
| Kanteco Construction Group INC | Kameron John Webb | — | (707) 508 7507 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Kapple Drywall | Kapple Drywall | — | (707) 996 2117 | Other | El Verano · Sonoma County | — | — |
| Karc INC | Richard Joseph Rubattino | — | (707) 974 5617 | Other | Santa Rosa · Sonoma County | — | — |
| Kardum Painting INC | Nicholas Stephen Kardum | — | (707) 938 1140 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Karl D'angelo Plumbing | Karl D'angelo Plumbing | — | (707) 231 0790 | Other | Santa Rosa · Sonoma County | — | — |
| Karl Eric Methum DBA M B & Company | Karl Eric Methum | — | (415) 298 5222 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Karma Dog Construction INC | Preston William Addison | info@karmadogconstruction.com | (707) 495 8456 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Karriker Hardwood Flooring | Karriker Hardwood Flooring | — | (707) 322 0673 | Other | Santa Rosa · Sonoma County | — | — |
| Kasting General Contracting | Jared Eugene Maddox | — | (707) 758 7676 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Kazemini Construction | Kazemini Reza | — | (707) 291 9246 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Kb Flooring | Kb Flooring | — | (707) 280 8831 | Other | Santa Rosa · Sonoma County | — | — |
| Kc Home Services | Kevin Edward Condon | — | (707) 626 9095 | HVAC | Santa Rosa · Sonoma County | — | — |
| Kd Homes | Daniel David Klassen | — | (707) 332 1511 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Kdk General Engineering | Kdk General Engineering | — | (707) 364 2986 | Other | Penngrove · Sonoma County | — | — |
| Kearney & Son Contracting And Consulting INC | Kevin Michael Kearney | — | (415) 819 1157 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Kearney And O'banion INC | Kevin Michael Kearney | kevin@kearneyobanion.com | (415) 819 1157 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Keegan And Coppin Builders INC | Albert Coppin | — | (707) 528 1400 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Keenan Flooring Covering | Keenan Flooring Covering | — | (707) 508 7067 | Other | Penngrove · Sonoma County | — | — |
| Keep Green Landscape | Keep Green Landscape | — | (707) 888 9318 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Keep It Real Plumbing | Keep It Real Plumbing | — | (707) 564 0239 | Other | Sonoma · Sonoma County | — | — |
| Kehr Construction INC | Walter Otto Kehr | — | (707) 763 8541 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Keith Construction | Daniel Lawrence Keith | — | (707) 758 6873 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Keith Soreng DBA Golden Gates | Keith Soreng DBA Golden Gates | — | (707) 778 2034 | Other | Petaluma · Sonoma County | — | — |
| Kekas Plumbing INC | Sanchez Sergio Chavez | kekasplumbinginc@gmail.com | (707) 280 3262 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |