| Keller Construction | John Michael Keller | resumes@kellerconstruction.com | (707) 484 5019 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Keller Electric | Greg Allen Keller | — | (707) 480 5784 | Electricians | Petaluma · Sonoma County | — | — |
| Kelley General Engineering | Kelley General Engineering | — | (707) 799 9266 | Other | Santa Rosa · Sonoma County | — | — |
| Kelly Ayers Paint Co | Kelly John Ayers | — | (707) 527 1700 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Kelly Cowan Designs Professional Corporation | Kelly Marshall Cowan | — | (415) 557 8958 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ken Borden Excavating & Grading | Ken Borden Excavating & Grading | — | (707) 546 7518 | Other | Santa Rosa · Sonoma County | — | — |
| Ken Roberts & Son General Contractor INC | Kenneth Martin Roberts | — | (415) 481 1762 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Kendell Brook Builders INC | Kenneth Mario Medrano | — | (707) 495 8783 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Kenley Electric INC | Kenneth Steve Jr Turner | sebastian@aldusleaf.org | (707) 894 6004 | Electricians | Windsor · Sonoma County | — | — |
| Kennedy Construction Company | Timothy John Kennedy | rekconst@gmail.com | (925) 997 7860 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Kenneth A Bellucci | Kenneth A Bellucci | — | (707) 763 6031 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Kenneth Bowman Landscaping | Kenneth Bowman Landscaping | — | (707) 206 1425 | Windows, patio, painters | Cloverdale · Sonoma County | — | — |
| Kenneth D Millard | Kenneth D Millard | — | (707) 396 7963 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Kenneth Douglas Martin | Kenneth Douglas Martin | — | (707) 578 1125 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Kenneth Highland | Kenneth Highland | — | (707) 765 2727 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Kent's Custom Tile | Kent's Custom Tile | — | (707) 529 0448 | Other | Santa Rosa · Sonoma County | — | — |
| Kenwood Fence Company INC | Richard Wayne Jr Smandra | info@kenwoodfence.com | (707) 527 1347 | Other | Santa Rosa · Sonoma County | — | — |
| Kerr Electric Service | James Thomas Kerr | — | (707) 479 1507 | Electricians | Santa Rosa · Sonoma County | — | — |
| Kerrent Electric | Johnson Kerr | info@kerrentelectric.com | (707) 272 0847 | Electricians | Sebastopol · Sonoma County | — | — |
| Kerry Lemos Electrical | Kerry Laban Lemos | — | (707) 888 3618 | Electricians | Petaluma · Sonoma County | — | — |
| Kerry Mullins | Kerry Mullins | — | (415) 265 1616 | Other | Petaluma · Sonoma County | — | — |
| Kevin Lee Berry | Kevin Lee Berry | — | (707) 795 5656 | Other | Cotati · Sonoma County | — | — |
| Kevin M Perkins Building And Design | Kevin Matthew Perkins | — | (707) 763 2789 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Kevin Montgomery Construction | Kevin Frederick Montgomery | — | (707) 291 1690 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Kevin N Furlong | Kevin N Furlong | — | (707) 876 3588 | Other | Valley Ford · Sonoma County | — | — |
| Kevin R Fye | Kevin R Fye | — | (707) 477 2704 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Kevin R Nguyen | Kevin R Nguyen | — | (707) 342 9586 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Kevin Robison Construction INC DBA Robison Construction | Kevin Dale Robison | — | (707) 769 4747 | Other | Penngrove · Sonoma County | — | — |
| Kevin Rohde | Kevin Rohde | — | (415) 299 7020 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Kevin Woodman DBA Phoenix Woodworks | Kevin Woodman DBA Phoenix Woodworks | — | (707) 585 8106 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Kevin's Landscaping | Kevin's Landscaping | — | (442) 287 7050 | Windows, patio, painters | Sebastopol · Sonoma County | — | — |
| Keystone Tile Works | Keystone Tile Works | — | (707) 478 7071 | Other | Santa Rosa · Sonoma County | — | — |
| Ki Arts | Ki Arts | info@kiarts.com | (707) 874 3361 | GC, remodel, ADU | Occidental · Sonoma County | — | — |
| Kick Electric | Nicholas Daniel Opdyke | — | (916) 812 4245 | Electricians | Rohnert Park · Sonoma County | — | — |
| Kiefer Electric INC | Brian Moore Kiefer | dustin@kiefer-electric.com | (707) 385 9745 | Electricians | Santa Rosa · Sonoma County | — | — |
| Kieran Collins Construction | Kieran Anthony Collins | — | (415) 608 4180 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Kieran Keaney | Kieran Keaney | — | (415) 720 1212 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Kiilerich Construction LLC | Mike Christopher Kiilerich | — | (707) 975 6340 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Kilcor Builders & Design INC | Richard Henry Phipps | — | (707) 568 1651 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Kimrick | Richard Dunlap Waite | — | (707) 494 9470 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |