| Jta Construction INC | Juan Armando Torres-Alvarez | — | (209) 277 2539 | GC, remodel, ADU | Hickman · Stanislaus County | — | — |
| Juarez Construction | Javier Jr Juarez | — | (925) 890 6715 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| Junior's Painting INC | Efren Jr Garcia | — | (209) 735 0998 | Windows, patio, painters | Turlock · Stanislaus County | — | — |
| K & D Enterprises INC | Kenneth Lee Thornberry | — | (209) 538 8492 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| K & K Home Services | Kurtis Donald Nelson | — | (209) 324 5543 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| K & K Specialties INC | Keith Michael Morris | — | (209) 595 2151 | Other | Riverbank · Stanislaus County | — | — |
| K And M Wood Crafters INC | Justin Michael Poynor | justin@kmwoodcrafters.com | (209) 538 4618 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| K D Supply | Rodney Ray Kelly | — | (209) 578 1575 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| K L Enterprises | Kenneth Neal Lewis | — | (209) 496 1311 | Pool | Modesto · Stanislaus County | — | — |
| K L Floor Service | Kent Roy Lenahan | — | (209) 403 3050 | Other | Modesto · Stanislaus County | — | — |
| K M Construction | Kevin Heisman Messer | — | (209) 652 4183 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| K R Concrete Construction INC | Kaysharlene Davis Ruvalcaba | — | (209) 847 4979 | Other | Oakdale · Stanislaus County | — | — |
| K Wells Mechanical | K Wells Mechanical | — | (209) 853 0532 | Other | Turlock · Stanislaus County | — | — |
| K-91 Building & Design | K-91 Building & Design | — | (209) 485 3103 | GC, remodel, ADU | La Grange · Stanislaus County | — | — |
| Kaleidoscope Painting | Kaleidoscope Painting | — | (909) 440 3523 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Kc Construction Services INC | Navarrete Marcos Salinas | — | (669) 203 7870 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Kc&s Construction Specialties INC | Katherine Harris | david.harris@kcsconstructionspecialties.com | (209) 678 2464 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Kcs Plumbing Co | Kenneth Charles Smith | — | (209) 505 6195 | Other | La Grange · Stanislaus County | — | — |
| Kcv Electric INC | Willians Ariel Arenas Diaz | — | (209) 765 7013 | Electricians | Modesto · Stanislaus County | — | — |
| Keefe Winokur | Keefe Winokur | — | (209) 524 0070 | Electricians | Modesto · Stanislaus County | — | — |
| Keeler Construction | Edward Earle Keeler | roy@keeler-construction.com | (209) 531 4217 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Keeler Surface Coatings | Keeler Surface Coatings | — | (209) 456 2441 | Windows, patio, painters | Oakdale · Stanislaus County | — | — |
| Keene Enterprises INC DBA Keene Enterprises | David Edward Keene | — | (209) 484 1185 | Other | Modesto · Stanislaus County | — | — |
| Keep It Pumping INC | William Earl Cook | — | (209) 630 0692 | Other | Hickman · Stanislaus County | — | — |
| Keith Brown Construction | Brown Keith | — | (209) 404 9906 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Keith Farish Construction | Keith Duane Farish | — | (209) 505 4533 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Kelly Door Supply | Rodney Ray Kelly | — | (209) 578 1575 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Kelly's Custom Tile | Kelly's Custom Tile | — | (209) 495 3611 | Other | Modesto · Stanislaus County | — | — |
| Kelvin's Arborist Tree Service INC | Juan Bautista Pinto Pacheco | — | (209) 210 0961 | Other | Riverbank · Stanislaus County | — | — |
| Ken Lederle General Construction | Kenneth William Lederle | — | (209) 605 5930 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Ken Rego | Ken Rego | — | (209) 602 2994 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Ken W Headrick | Ken W Headrick | — | (209) 527 1215 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Kent Construction | Donald Kent Adams | — | (209) 603 3585 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Kern Construction | Vincent Solomon Kern | — | (209) 484 1118 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Kerr Construction Co | Stephen Phillip Kerr | — | (209) 495 1126 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Kevin Donnelly Roofing INC | Kevin Craig Donnelly | — | (209) 996 4980 | Other roofers | Oakdale · Stanislaus County | — | — |
| Kevin Holm | Kevin Holm | — | (209) 985 5231 | Other | Modesto · Stanislaus County | — | — |
| Kevin J Cooper DBA Cooper Window & Door | Cooper Window & Door | — | (209) 918 5183 | Windows, patio, painters | Hughson · Stanislaus County | — | — |
| Kevin Mc Connell Const | Kevin Mc Connell Const | — | (209) 613 7087 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Kevin Polhemus Technical Facilities | Kevin Polhemus Technical Facilities | — | (209) 529 7651 | Electricians | Modesto · Stanislaus County | — | — |