| John Larkins | John Larkins | — | (530) 575 9902 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| John Malchaski DBA Excel Excavating | John Malchaski DBA Excel Excavating | — | (530) 386 0664 | Other | Truckee · Nevada County | — | — |
| John Voelz Son's Painting | John Voelz Son's Painting | — | (530) 308 6406 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| Johnson Craig Plumbing INC | Craig Alan Johnson | — | (530) 274 7275 | Other | Cedar Ridge · Nevada County | — | — |
| Johnson Iron INC | Joshua Michael Ruppert | info@johnsoniron.com | (530) 550 0562 | Other | Truckee · Nevada County | — | — |
| Johnson Trails | Johnson Trails | erik@johnsontrails.com | (510) 393 3539 | Other | Penn Valley · Nevada County | — | — |
| Johnson's Painting | Johnson's Painting | — | (530) 575 0911 | Windows, patio, painters | Penn Valley · Nevada County | — | — |
| Johnson's Woodworking | Johnson's Woodworking | info@ndiscovered.com | (530) 205 5647 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Jon L Mcguckin | Jon L Mcguckin | — | (530) 913 2376 | GC, remodel, ADU | Cedar Ridge · Nevada County | — | — |
| Jones Corda Construction INC | Joan Adele De Ryk-Jones | — | (530) 583 5150 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Josh Moore Construction Incorporated | Moore Joshua | — | (530) 205 5555 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Joshua Forbes | Joshua Forbes | — | (808) 747 3245 | Other | Rough And Ready · Nevada County | — | — |
| Joy's Landscape | Joy's Landscape | — | (530) 432 1331 | Windows, patio, painters | Rough And Ready · Nevada County | — | — |
| Julian Construction | Eric John Julian | — | (530) 798 9280 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Juniper Flat Construction | Eric Michael Bacon | — | (530) 583 2805 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Juric Enterprise | Juric Enterprise | — | (530) 913 0418 | Other | Grass Valley · Nevada County | — | — |
| Justin Allen Electric | Justin Thomas Allen | — | (530) 559 8770 | Electricians | Grass Valley · Nevada County | — | — |
| Justin Connor Construction | Justin Lee Connor | — | (530) 414 1730 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Justin Dille Construction | Justin Daniel Dille | — | (530) 388 8007 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Justin Dowd Construction | Justin Matthew Dowd | — | (530) 798 0713 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Jw Electric | Jon Vincente Werner | — | (530) 802 1620 | Electricians | Grass Valley · Nevada County | — | — |
| Jworks | Jeremy Justin Jones | — | (530) 263 1511 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| K & D Construction | David Robert Bartow | — | (530) 559 1184 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| K Andy Construction | Andrew Mathias Ii Kuhnmuench | — | (530) 448 6903 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| K D Mechanical | K D Mechanical | info@kdmechanical.com | (530) 718 0000 | HVAC | Grass Valley · Nevada County | — | — |
| K L B Construction | Kevin Lee Bramer | info@klbconstruction.com | (530) 305 3775 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| K L Painting | K L Painting | info@klpainting.com | (530) 913 4200 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| K M Flooring | K M Flooring | — | (530) 559 9627 | Other | Grass Valley · Nevada County | — | — |
| K V Structures INC | Margaret Juzek Mc Collum | info@kvstructures.com | (530) 432 7625 | Other | Cedar Ridge · Nevada County | — | — |
| K2 Painting | K2 Painting | — | (707) 499 2643 | Windows, patio, painters | Cedar Ridge · Nevada County | — | — |
| Kane Construction INC | Daniel Patrick Kane | — | (702) 604 6877 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Karl Sherry Electric | Karl Michael Sherry | — | (530) 559 3988 | Electricians | Nevada City · Nevada County | — | — |
| Karwowski Hardwood Floors | Karwowski Hardwood Floors | — | (530) 277 9951 | Other | Truckee · Nevada County | — | — |
| Kasza Roofing | Daniel Jozsef Kasza | — | (530) 913 5917 | Other roofers | Cedar Ridge · Nevada County | — | — |
| Kch Construction | Kevin Christopher Harr | — | (530) 446 0253 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Kcr Construction LLC | Keaton Christopher Richards | — | (530) 913 6145 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| Keehn Construction | Jonathan Babcock Keehn | — | (530) 913 2347 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Keenan Construction Company | John Michael Keenan | — | (530) 906 4478 | Electricians | Rough And Ready · Nevada County | — | — |
| Keith Korpela Masonry | Keith Korpela Masonry | — | (707) 331 6153 | Other | Penn Valley · Nevada County | — | — |
| Keith Lindsay Construction | Keith Lawrence Lindsay | — | (530) 205 7409 | GC, remodel, ADU | Truckee · Nevada County | — | — |