| M D Plumbing | M D Plumbing | — | (530) 448 3284 | Other | Truckee · Nevada County | — | — |
| M E M Electrical INC | Maynard Edward Oistad | — | (530) 432 6381 | Electricians | Penn Valley · Nevada County | — | — |
| M P C Drywall INC | Mark Stephen Parr | — | (530) 277 7350 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| M Renovations LLC | Matthias Wilhelm Mede | — | (707) 591 3439 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mack Construction | Thomas Michael Mack | — | (530) 263 7518 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Mainguth Plants & Irrigation | Mainguth Plants & Irrigation | — | (530) 263 4318 | Windows, patio, painters | Nevada City · Nevada County | — | — |
| Maisel Electric | Mark Stephen Maisel | — | (530) 392 1507 | Electricians | Truckee · Nevada County | — | — |
| Malik Construction INC | Malik Bill | — | (916) 459 6455 | Other | Grass Valley · Nevada County | — | — |
| Mana Construction LLC | Mathew Leonard Phillips | — | (925) 787 8115 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Marble Masons | Marble Masons | — | (775) 842 0360 | Other | Truckee · Nevada County | — | — |
| Mark Brixey Construction LLC | Mark Allen Brixey | — | (530) 330 2979 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mark C Seufert Construction | Mark Charles Seufert | — | (530) 615 1020 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Mark Early Construction | Mark Francis Early | — | (530) 446 5434 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| Mark Howell General Contracting | Mark Jeffrey Howell | — | (530) 913 1545 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Mark Keeling Flooring | Mark Keeling Flooring | — | (530) 913 3741 | Other | Penn Valley · Nevada County | — | — |
| Mark L Holcomb | Mark L Holcomb | — | (530) 414 1336 | GC, remodel, ADU | Floriston · Nevada County | — | — |
| Mark Stephens | Mark Stephens | — | (530) 798 3333 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Mark Stuart Harvie | Mark Stuart Harvie | — | (530) 274 3312 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Marshall Plumbing | Marshall Plumbing | — | (530) 562 7108 | Other | Truckee · Nevada County | — | — |
| Marsico Construction | Samuel Paul Marsico | — | (530) 272 9310 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Marsico Custom Homes INC | Samuel Joseph Marsico | marsicohomes@yahoo.com | (530) 271 1445 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Marston Homecrafters | Marston Homecrafters | — | (808) 987 4019 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Martin Electric | Dennis Herbert Martin | — | (707) 479 8421 | Electricians | Grass Valley · Nevada County | — | — |
| Martis Valley Landscapes INC | Benjamin Vincent Colton | — | (530) 414 3568 | Windows, patio, painters | Truckee · Nevada County | — | — |
| Martis Valley Mechanical INC | Greg Haugen | — | (530) 386 5011 | HVAC | Truckee · Nevada County | — | — |
| Martis Valley Plumbing INC | Jeffrey Edwin Peet | — | (530) 587 3034 | Other | Truckee · Nevada County | — | — |
| Marvin Dinovitz | Marvin Dinovitz | — | (805) 908 5464 | GC, remodel, ADU | Rough And Ready · Nevada County | — | — |
| Massetani Plumbing | Massetani Plumbing | — | (925) 788 6637 | Other | Truckee · Nevada County | — | — |
| Matco Construction Co | Matthew Brent Howell | — | (530) 277 8330 | GC, remodel, ADU | Cedar Ridge · Nevada County | — | — |
| Mats Allen Construction | Mats Henri Allen | — | (831) 346 2232 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Matt Arvay Construction | Matthew Paul Arvay | — | (530) 210 3609 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Matt Gore Construction | Matthew Robert Gore | — | (530) 559 4008 | GC, remodel, ADU | Rough And Ready · Nevada County | — | — |
| Matt Noel Construction | Noel Matt | — | (530) 615 7071 | GC, remodel, ADU | North San Juan · Nevada County | — | — |
| Matt Rogers Construction | Matthew Gray Rogers | — | (530) 470 3514 | GC, remodel, ADU | North San Juan · Nevada County | — | — |
| Matthew Joyce Construction | Matthew Richard Joyce | — | (530) 264 8812 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Matthew Kennon Marin | Matthew Kennon Marin | — | (530) 210 9835 | Other | Grass Valley · Nevada County | — | — |
| Maverick Builders | Thomas William Hogarth | — | (530) 414 8511 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Max Collinson | Max Collinson | — | (530) 414 4006 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mazotti Dominick | Mazotti Dominick | — | (925) 200 9428 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Mc Evoy Electric | Jeff M Mc Evoy | jeff@mcevoyelectric.com | (530) 559 9173 | Electricians | Penn Valley · Nevada County | — | — |