| Mountain General Engineering LLC | John Kevin Mountain | — | (707) 889 0048 | Other | Petaluma · Sonoma County | — | — |
| Mountain House Mechanical | Mountain House Mechanical | — | (707) 926-3544 | HVAC | Rohnert Park · Sonoma County | — | — |
| Mountain HVAC LLC | Jon Russell Lapointe | — | (707) 327 0329 | HVAC | Rohnert Park · Sonoma County | — | — |
| Mountain Lion General Engineering | Mountain Lion General Engineering | — | (707) 974 0785 | Other | Petaluma · Sonoma County | — | — |
| Mountain Valley Builders | David Jacob Hunt | — | (707) 540 1233 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Moya Landscaping | Moya-chavez Efrain | — | (707) 364 7377 | Windows, patio, painters | El Verano · Sonoma County | — | — |
| Mr Christian Painting & Decorating | Mr Christian Painting & Decorating | — | (415) 491 4345 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Mr Construction | Romero Mauricio | — | (707) 483 8922 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mr Diaz Tile | Mr Diaz Tile | — | (707) 481 0961 | Other | Santa Rosa · Sonoma County | — | — |
| Mr Drywall | Mr Drywall | — | (415) 720 4092 | Other | Petaluma · Sonoma County | — | — |
| Mr Plumber | Mr Plumber | — | (707) 695 0016 | Electricians | Rohnert Park · Sonoma County | — | — |
| Mr Rooter Plumbing Of Sonoma County | Joey Dyane Mcdaniel | — | (707) 525 5670 | Other | Santa Rosa · Sonoma County | — | — |
| Mrcooler HVAC Service | Pan Chunlin | — | (580) 789 9999 | HVAC | Rohnert Park · Sonoma County | — | — |
| Mrlandscape & Maintenance | Mrlandscape & Maintenance | — | (707) 721 2650 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Mrt Landscape Conctractors INC | Juan Diego Macias Duarte | — | (707) 758 0843 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Msbi Fire N Ice HVAC | Michael Shane Broadhead | — | (707) 570 9019 | HVAC | Graton · Sonoma County | — | — |
| Mtg Designs | Mtg Designs | — | (707) 328 4366 | Other | Santa Rosa · Sonoma County | — | — |
| Mtz Plumbing | Mtz Plumbing | — | (707) 396 3584 | Other | Santa Rosa · Sonoma County | — | — |
| Muller Plumbing | Muller Plumbing | — | (707) 849 9919 | Other | Cloverdale · Sonoma County | — | — |
| Mullins & Co Construction | James John Mullins | — | (707) 576 7853 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Munoz Plumbing | Munoz Plumbing | — | (707) 576 3930 | Other | Santa Rosa · Sonoma County | — | — |
| Munoz Tile & Stone INC | Jose Guadalupe Munoz Gutierrez | — | (707) 696 1362 | Other | Petaluma · Sonoma County | — | — |
| Murillos Painting | Murillos Painting | — | (707) 328 8562 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Murphey Construction & Remodel | Steven Arnold Murphey | — | (707) 695 8434 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Murphy Framing | Murphy Framing | — | (707) 977 0252 | Other | Petaluma · Sonoma County | — | — |
| Murphy's Masterpieces | Murphy's Masterpieces | — | (707) 535 9473 | Windows, patio, painters | Cloverdale · Sonoma County | — | — |
| Murphy-true INC DBA Jim Murphy & Associates | Noah Paul Costa | — | (707) 576 7337 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Murphys Backhoe Service | Patrick Shawn Murphy | — | (707) 324 9997 | Other | Santa Rosa · Sonoma County | — | — |
| Murray Building INC | Scott Michael Murray | — | (707) 939 9001 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Murray Construction | Riya Ryan Murray | — | (707) 484 5679 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mv Construction | Matthew Thomas Van Heusen | — | (707) 536 3026 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Mv Design + Build | Marco Antonio Viramontes | — | (707) 304 4280 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Myers Home Services | Mark Allan Myers | — | (707) 396 5533 | Other | Petaluma · Sonoma County | — | — |
| Myers Restaurant Supply LLC | Robert James Wranosky | — | (707) 570 1200 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Myles Construction | Joel La Franz Myles | — | (707) 321 1440 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Myles Gaffney Painting And Decorating | Myles Gaffney Painting And Decorating | — | (707) 545 5949 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Myra Studio | Lewis Neal Buchner | — | (415) 672 1527 | Other | Sebastopol · Sonoma County | — | — |
| N C Drywall Zone INC | Juan Manuel Anzures | — | (707) 708 6640 | Other | Santa Rosa · Sonoma County | — | — |
| N C I Electric | Nickolas Christ Ioannou | — | (707) 479 8344 | Electricians | Rohnert Park · Sonoma County | — | — |
| N G Builder Company | Nicholas Daniel Gutierrez | — | (707) 852 5046 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |