| Jt Construction | Jeffrey Taylor Peterson | — | (415) 686 6400 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Jt Construction Management INC | Toquinto Jeffrey | — | (415) 246 0108 | GC, remodel, ADU | Woodacre · Marin County | — | — |
| Juan Vazquez | Juan Vazquez | juan@juanvazquez.com | (415) 828 9638 | GC, remodel, ADU | Novato · Marin County | — | — |
| Juarez Tree Service | Erik Alexander Juarez Vasquez | juareztreeservice2016@gmail.com | (415) 378 9436 | Tree | San Rafael · Marin County | — | — |
| Juney Cambria Painting | Juney Cambria Painting | — | (415) 497 3136 | Windows, patio, painters | Novato · Marin County | — | — |
| Jungsten Construction | Jungsten Jeffrey | — | (415) 381 3162 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Just Builders INC | Justin Cole Drenner | justbuilders@gmail.com | (415) 858 5251 | GC, remodel, ADU | Novato · Marin County | — | — |
| Just Remnants | Daniel Karl Murphy-Peck | — | (415) 455 8882 | Other | San Rafael · Marin County | — | — |
| Jv Painting | Jv Painting | — | (707) 981 1187 | Windows, patio, painters | Novato · Marin County | — | — |
| Jv Pro Painting Corporation | Jerman Rodimiro Vasquez Vasquez | — | (415) 912 8625 | Windows, patio, painters | San Rafael · Marin County | — | — |
| K C Kitchen And Bath Builder | Kevin Alexis Cordova Quinteros | — | (415) 991 9135 | GC, remodel, ADU | Novato · Marin County | — | — |
| K D C Construction | Kevin David Calderon | — | (415) 699 3055 | GC, remodel, ADU | Greenbrae · Marin County | — | — |
| K G Brosnan Construction | Patrick Gerrard Brosnan | — | (415) 827 0638 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| K L Construction | Santiago Rocael Mazariegos | — | (415) 377 4746 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| K R W Construction INC | Kirk Randall Williamson | — | (415) 755 7152 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Kabler Construction Services INC | John Russell Kabler | — | (415) 888 8812 | Other | Novato · Marin County | — | — |
| Kaiser Gardens INC | Lisa Marie Kaiser | — | (415) 699 7423 | Windows, patio, painters | San Anselmo · Marin County | — | — |
| Kaludia Builders INC | Jorge Enrique Gomez | — | (415) 309 2044 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Kamalani Construction INC | Denise Dutra| Maurer Denise Christine Maloney | info@kamalaniconstruction.com | (916) 899 3223 | GC, remodel, ADU | Novato · Marin County | — | — |
| Kamalani-odin Jv | Environmental Solutions LLC Odin | — | (916) 251 5500 | Other | Novato · Marin County | — | — |
| Kamrin Group | Kambiz Moafi | — | (415) 769 6565 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Kansora Communications Services | Thomas Joseph Kansora | — | (415) 497 2353 | Other | San Rafael · Marin County | — | — |
| Karen Doty Garden Designs | Karen Doty Garden Designs | — | (415) 246 3927 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Karkabi Construction INC | Naaim Elias Karkabi | — | (415) 459 2401 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Karl Bartlett | Karl Bartlett | contact@info.com | (415) 691 7169 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Karla Rae Deshon | Karla Rae Deshon | — | (415) 850 2115 | GC, remodel, ADU | Novato · Marin County | — | — |
| Karoll Julian INC | Karoll Brigitte Hirn | — | (415) 455 1400 | Windows, patio, painters | San Anselmo · Marin County | — | — |
| Katarina Total Yardscape | Katarina Total Yardscape | — | (415) 726 7434 | Windows, patio, painters | Novato · Marin County | — | — |
| Kavanagh Electrical | Stephen John Kavanagh | — | (415) 250 2983 | Electricians | Novato · Marin County | — | — |
| Kavanagh Specialty Plumbing INC | Jody Patrick Kavanagh | — | (408) 393 6639 | Other | Novato · Marin County | — | — |
| Kehl Construction | David Christian Jr Kehl | — | (415) 507 1948 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Keith Bruns Woodworking | Keith Bruns Woodworking | — | (415) 710 5979 | Other | Mill Valley · Marin County | — | — |
| Keith Tadder | Keith Tadder | — | (415) 786 0583 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Kelly Day Contractor | Kelly Day Contractor | — | (415) 457 1346 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Kelly Pacific Construction Co | Gary Lee Domer | — | (415) 464 0900 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Kelly Plumbing & Heating INC | James Patrick Kelly | — | (415) 892 3424 | HVAC | Novato · Marin County | — | — |
| Ken Azevedo Electric INC | Kenneth Matthew Azevedo | — | (415) 328 2343 | Electricians | San Rafael · Marin County | — | — |
| Ken Cooper Roofing | Ken Cooper Roofing | — | (415) 498-1311 | Other roofers | Marin · Marin County | — | — |
| Ken Cooper Roofing & Gutter Systems INC | Kyle Johnston Cooper | — | (415) 446 5500 | Other roofers | San Rafael · Marin County | — | — |
| Ken Doyle DBA Advanced Safe & Vault | Advanced Safe & Vault | — | (415) 878 0235 | Other | Novato · Marin County | — | — |