| Mlu Custom Builders | Mitchell Lozier Utley | — | (530) 432 2390 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| Mmf Welding | Mmf Welding | — | (530) 559 6606 | Other | Nevada City · Nevada County | — | — |
| Mmw Builders | Mark Xavier Donahue | — | (530) 587 0123 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Modus Manufacturing | Richard Hardy Newman | — | (530) 287 4600 | Other | Rough And Ready · Nevada County | — | — |
| Moen's Construction | Ryan Russell Moen | — | (530) 263 5588 | GC, remodel, ADU | Penn Valley · Nevada County | — | — |
| Molitor Painting Company | David Terrence Molitor | — | (530) 432 3316 | Windows, patio, painters | Penn Valley · Nevada County | — | — |
| Monarch Painting And Decorating | Monarch Painting And Decorating | — | (530) 268 8429 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| Montenegro's Builders INC | Montenegro Homero Rodriguez | — | (775) 233 8549 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Montgomery Clayman Construction | Montgomery Stephan Clayman | — | (530) 559 5397 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Montre Construction | Darrell Majors Montre | — | (530) 575 1108 | GC, remodel, ADU | Rough And Ready · Nevada County | — | — |
| Moore Construction | Jeffrey Alan Moore | — | (530) 305 1671 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Moore Plumbing Concepts | Moore Plumbing Concepts | — | (530) 320 6360 | Other | Truckee · Nevada County | — | — |
| Moore Plumbing Construction And Services INC | Martin Craig Moore | — | (530) 346 2239 | GC, remodel, ADU | Chicago Park · Nevada County | — | — |
| Morelli Painting | Morelli Painting | — | (530) 913 5408 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| Morgan Built Construction | Mark Thomas Morgan | — | (530) 205 0101 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Morris Construction | Kennen David Morris | — | (530) 913 9431 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Mosbacher Construction | Kenneth Paul Mosbacher | — | (530) 615 8873 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Moule Glass And Glazing | James Spencer Moule | — | (530) 273 4643 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| Mountain Accents Construction LLC | David Gepner | — | (510) 847 6122 | GC, remodel, ADU | Nevada City · Nevada County | — | — |
| Mountain Air Heating And Cooling | Mountain Air Heating And Cooling | — | (530) 888 7894 | HVAC | Grass Valley · Nevada County | — | — |
| Mountain Air Refrigeration | Mountain Air Refrigeration | — | (530) 277 7851 | HVAC | Nevada City · Nevada County | — | — |
| Mountain Electrical Construction INC | Robert William Reshatoff | — | (530) 477 6100 | Electricians | Grass Valley · Nevada County | — | — |
| Mountain Fire Protection | Mountain Fire Protection | — | (530) 309 1217 | Other | Grass Valley · Nevada County | — | — |
| Mountain High Homes | Mountain High Homes | — | (530) 414 4933 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Mountain Home Center | Thomas Edward Just | — | (580) 587-6681 | Other | Truckee · Nevada County | — | — |
| Mountain Insulation | Mountain Insulation | matt.collins@mountain-insulation.com | (530) 446 4466 | Other | Grass Valley · Nevada County | — | — |
| Mountain Life Construction INC | Pavlo V Gesmundo | — | (530) 559 1493 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mountain Lion Construction | Victor Manuel Rodriguez-Santos | — | (530) 368 4710 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| Mountain Plumbing Solutions INC | Parker Thomas Laughlin | info@mountainplumbingsolutions.com | (530) 559 9747 | Other | Truckee · Nevada County | — | — |
| Mountain Top Construction | Rodd Richard Adams | interested@domainmarket.com | (530) 214 6125 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mountain Top Painting INC | Christopher Lee Gaddis | comtpainting@gmail.com | (719) 888-9873 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| Mountain View Construction | Steven Michael Maciel | — | (530) 448 1472 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mountain View Glass | Stephen Morris Smith | — | (530) 587 2401 | Windows, patio, painters | Truckee · Nevada County | — | — |
| Moyer's Electric | Brandin Richard Moyer | — | (530) 305 4875 | Electricians | Cedar Ridge · Nevada County | — | — |
| Mp Construction | Mark Allen Price | — | (530) 562 7052 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mr Moore's Painting And Wallcoverings | Mr Moore's Painting And Wallcoverings | — | (530) 274 0860 | Windows, patio, painters | Grass Valley · Nevada County | — | — |
| Mt Lincoln Construction INC | Christopher James Tennant | — | (530) 582 8174 | GC, remodel, ADU | Truckee · Nevada County | — | — |
| Mtn Painting LLC | Willard Michael House | — | (530) 562 5718 | Windows, patio, painters | Truckee · Nevada County | — | — |
| Mtn Sun Electric | Jeremy Scott Fullmer | mtnsunelectric@gmail.com | (530) 559 7813 | Electricians | Truckee · Nevada County | — | — |
| Mullenix Building & Design INC | Dillon Chatfield Mullenix | — | (323) 854 3569 | GC, remodel, ADU | Nevada City · Nevada County | — | — |