| Kelly Brothers Painting INC | Kevin Charles Kelly | — | (530) 550 0806 | Windows, patio, painters | Truckee · Nevada County | — | — |
| Kelly Nunnink Painting | Kelly Nunnink Painting | impallari@gmail.com | (916) 947 2962 | Windows, patio, painters | Penn Valley · Nevada County | — | — |
| Keltic Construction | Kevin Nigel Wall | info@kelticconstruction.com | (530) 249 4042 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Ken Brose Tile | Ken Brose Tile | kenbrose66@yahoo.com | (530) 798 9269 | Other | Grass Valley · Nevada County | — | — |
| Ken Panziera Construction | Kenneth Roberts Panziera | — | (530) 448 9803 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Kennedy Bespoke Millwork LLC | Eileen Marie Kennedy | — | (530) 575 5833 | Other | Nevada City · Nevada County | — | — |
| Kerr Construction | Forrest John Kerr | — | (530) 277 5288 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Kevin Riley's Carpet & Linoleum | Kevin Riley's Carpet & Linoleum | — | (530) 521 0513 | Other | Grass Valley · Nevada County | — | — |
| Kiely Construction INC | Robert William Kiely | — | (530) 386 3436 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Kilborn Enterprises LLC | John Fitzgerald Kilborn | — | (530) 446 1337 | Other | Grass Valley · Nevada County | — | — |
| King Ben Construction Co | Benny Redellium Iii King | — | (530) 913 7948 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| King Plumbing | Nancy Shepard King | — | (530) 913 7839 | Other | Nevada City · Nevada County | — | — |
| Kip Craig Construction | Clifford Clare Craig | — | (530) 277 0859 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Kirk Belding Construction | Kirk Allen Belding | — | (530) 362 0015 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Kiwis Painting | Kiwis Painting | — | (530) 277 6302 | Windows, patio, painters | Nevada City · Nevada County | — | — |
| Kja Construction | Mitchell John James Creamer | — | (530) 913 9997 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Kleker Construction | John Carlos Kleker | — | (530) 386 3882 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Klingelhofer Construction | Jon Merrick Klingelhofer | — | (530) 292 1745 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Klus Konstruction | Klus Konstruction | — | (530) 277 0275 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Koa Young Builders | Koa Young Builders | — | (530) 615 9154 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| Koch & Koch INC | Mei-lung Fore Koch | — | (530) 432 4000 | Electricians | Grass Valley · Nevada County | — | — |
| Kosich Enterprises LLC | Jason Anthony Kosich | — | (530) 386 0415 | Tree | Truckee · Nevada County | — | — |
| Kraft Kitchens And Construction | Peter Lewis Kraft | — | (530) 263 0602 | Electricians | Nevada City · Nevada County | — | — |
| Kris Meadows Construction | Kristopher Lee Meadows | — | (530) 354 5638 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Krommenhoek Masonry | Krommenhoek Masonry | — | (530) 386 3357 | Other | Truckee · Nevada County | — | — |
| Kropp Construction | James Raymond Kropp | — | (831) 515 9528 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Kt Electric | Terry Patrick Jr Bredek | — | (916) 773 0821 | Electricians | Grass Valley · Nevada County | — | — |
| Kurt's Garden INC | Kurtis Kishore Wahi | — | (530) 274 8733 | Windows, patio, painters | Cedar Ridge · Nevada County | — | — |
| Kv Structures Construction INC | Kara Diane Mccollum | — | (530) 570 6101 | Other | Grass Valley · Nevada County | — | — |
| Kyle P Frankland Construction | Kyle Phillip Frankland | — | (530) 386 6958 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| La Barre Electric | David Lawrence La Barre | — | (530) 615 6380 | Electricians | Nevada City · Nevada County | — | — |
| Lamperti Construction INC | Joseph Michael Lamperti | info@lamperticonstruction.com | (530) 550 1505 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Lance Painting And Decorating | Lance Painting And Decorating | — | (925) 212 5124 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| Lanigan & Sons Grading INC | Curtis Michael Lanigan | — | (951) 543 3078 | Other | Grass Valley · Nevada County | — | — |
| Larkins Plumbing | Larkins Plumbing | — | (530) 277 7567 | Other | North San Juan · Nevada County | — | — |
| Larry Defeyter Painting | Larry Defeyter Painting | — | (530) 272 6859 | Windows, patio, painters | Nevada City · Nevada County | — | — |
| Larry Terronez Ceramic Tile | Larry Terronez Ceramic Tile | — | (530) 263 4399 | Other | Grass Valley · Nevada County | — | — |
| Larry Wessels The Cabinet Doctor | Larry Wessels The Cabinet Doctor | — | (530) 268 3998 | Other | Grass Valley · Nevada County | — | — |
| Laubscher Builders INC | Robert Michael Laubscher | — | (530) 545 0840 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Leaf It To Me INC | Aero Martin Acton | — | (530) 477 9822 | Windows, patio, painters | Cedar Ridge · Nevada County | — | — |