| Maxwell Fabrication LLC | Walker R Maxwell | — | (707) 264 9792 | Other | Windsor · Sonoma County | — | — |
| Maxx Power Electric INC | Jason Hamilton Taylor | — | (707) 328 8939 | Electricians | Santa Rosa · Sonoma County | — | — |
| Mayacama Construction INC | Jeffrey Mark Widener | — | (707) 567 2244 | GC, remodel, ADU | Rio Nido · Sonoma County | — | — |
| Mayo's Painting | Mayo's Painting | — | (707) 481 9442 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Mazariegos Construction | Charly Davis Mazariegos Mazariegos | — | (415) 912 9730 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Mb Homes Sonoma LLC | Spasovski Mario | — | (707) 757 0042 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mbg General Engineering INC | Michael Benjamin Gayski | — | (707) 354 1972 | Other | Guerneville · Sonoma County | — | — |
| Mc Cannell Construction INC | Rodney Willis Mc Cannell | — | (707) 953 3195 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mc Cullough Construction | David Lee Mc Cullough | — | (707) 696 3137 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Mc Devitt Construction | Adam Philip Sandow | — | (707) 763 3000 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Mc Gillicuddy Construction | David Edmond Mc Gillicuddy | — | (707) 849 2625 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mc Intosh Builders INC | Barbara Lynn Mc Intosh | carolyn@mcintoshbuilders.com | (707) 573 3947 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mc Neil Construction & Remodeling INC | Bradley Christopher Mc Neil | — | (707) 665 9531 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Mc Neil Remodeling & Construction | Michael William Mc Neil | — | (707) 228 9945 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mc Nulty Construction Co | Melody Medvin Mc Nulty | — | (707) 823 3306 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Mccarthy Construction | Sean Thomas Mccarthy | doug@mccarthyconstruction.com | (515) 240-4884 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Mcchesney Painting | Mcchesney Painting | — | (707) 236 2868 | Windows, patio, painters | Penngrove · Sonoma County | — | — |
| Mcchinak Incorporated | Richard Joseph Mc Chinak | — | (707) 539 6104 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mccluskey Engineering INC | Mathew Scott Mccluskey | — | (707) 615 7277 | Other | Santa Rosa · Sonoma County | — | — |
| Mccr Roofing INC | Miguel Angel Castellanos Cortez | — | (707) 955 4187 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Mccready Construction INC | Curtis Bele Mc Cready | — | (415) 225 9542 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Mccurdy & Diaz Painting INC | Mc Curdy Leif | — | (707) 206 1401 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Mcdonald Pools INC | Clarette Rose Mcdonald | gary@mcdonaldpools.com | (707) 333 8104 | Pool | Valley Ford · Sonoma County | — | — |
| Mcdonell Electric INC | Eric Scott Mcdonell | — | (707) 791 2000 | Electricians | Santa Rosa · Sonoma County | — | — |
| Mcelligott Construction INC | Maurice Patrick Mc Elligott | mcelligottconstruction@msn.com | (650) 296 9518 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Mcelroy Painting | Mcelroy Painting | — | (707) 938-3079 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Mcevoy Construction | Charlie Barnes Mcevoy | — | (707) 326 2661 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mcfly Plumbing | Mcfly Plumbing | — | (707) 655 3160 | Other | Rohnert Park · Sonoma County | — | — |
| Mcgovern INC | Mcgovern Christopher | firstname@mcgovern.com | (707) 292 4570 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Mcguire Professional Painting | Mcguire Professional Painting | — | (707) 971 1305 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Mcisaac Heating | Mcisaac Heating | — | (415) 717 4728 | HVAC | Petaluma · Sonoma County | — | — |
| Mcm Custom Construction INC | Robert Clinton Mcmichael | — | (707) 484 8720 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Mcm Mechanical | Matthew James Monnich | mcmmechanical247@gmail.com | (707) 234 5449 | HVAC | Sonoma · Sonoma County | — | — |
| Mcmahon Fernandez Construction INC | John Francis Mc Mahon | — | (707) 756 0113 | Other | Sonoma · Sonoma County | — | — |
| Mcmasters Construction INC | Adam Richard Mcmasters | — | (707) 843 9769 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mcmillan Roofing | Travis Patrick Mcmillan | support@webador.com | (707) 799 0517 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Mcminn Construction Group LLC | Zephan David Mcminn | — | (707) 508 9419 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mcnichols Construction | Aaron Franklin Mcnichols | — | (530) 214 6103 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Mcphail Fuel Co INC | Steven Matthew Dittman | — | (707) 285 3525 | Other | Cotati · Sonoma County | — | — |
| Mcpheron Construction INC | Cody Edward Mcpheron | — | (707) 888 1646 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |