| Martin Mc Carthy Construction | Martin James Mc Carthy | — | (707) 303 0941 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Martin's Painting | Martin's Painting | — | (707) 591 3804 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Martinelli Electric | Seth Daniel Martinelli | — | (415) 279 4587 | Electricians | Sebastopol · Sonoma County | — | — |
| Martinelli Grading & Excavating | Martinelli Grading & Excavating | — | (707) 608 9034 | Other | Santa Rosa · Sonoma County | — | — |
| Martinez Manny Construction | Manuel Mateo Martinez Cardozo | — | (707) 236 5080 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Martinez Roofing | Martinez Gilberto | interested@domainmarket.com | (707) 217 7549 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Marvel Grading & Paving | Marvel Grading & Paving | — | (707) 484 1771 | Other | Sebastopol · Sonoma County | — | — |
| Marwes Construction | Wesley Earl Ii Barry | — | (707) 481 3594 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Marzullo Electric Co | Anthony Lawrence Marzullo | — | (707) 829 3883 | Electricians | Sebastopol · Sonoma County | — | — |
| Mason White Landscape Architecture INC | Stephen Murray White | — | (707) 545 8780 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Masonry By Conrad | Masonry By Conrad | — | (707) 486 3674 | Other | Santa Rosa · Sonoma County | — | — |
| Masonry Contractor Installers Mci INC | Jeff Landon Gentry | — | (707) 542 0477 | Other | Santa Rosa · Sonoma County | — | — |
| Master Builds Construction | Isaias Jorge Montoya Ojeda | — | (707) 547 7175 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Master Color Painting | Master Color Painting | stevedesbiens9@gmail.com | (707) 303-5930 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Master Craft Stairs | Master Craft Stairs | — | (707) 396 3892 | Other | Santa Rosa · Sonoma County | — | — |
| Masterstouch Construction INC | Carl Eric Rose | — | (707) 543 5800 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mastertouch Painting Company | Thomas Aquinis Schalich | — | (707) 527 6988 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Matheny Electric | John Alexander Matheny | — | (707) 490 6723 | Electricians | Santa Rosa · Sonoma County | — | — |
| Matlock Roofing INC | Silvestre Flores Sanchez | — | (707) 869 0373 | Other roofers | Guerneville · Sonoma County | — | — |
| Matos Contracting INC | Alexis Lionel Matos | office@matoscontracting.com | (949) 357 7335 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Matt Anderson | Matt Anderson | — | (415) 533 6248 | Electricians | Windsor · Sonoma County | — | — |
| Matt Etchell Construction | Matthew John Etchell | — | (707) 484 6031 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Matt Vargas Custom Flooring | Matt Vargas Custom Flooring | — | (707) 326 2262 | Other | Santa Rosa · Sonoma County | — | — |
| Matt's North Bay Maintenance LLC | Matthew Blake Evans | — | (415) 827 2899 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Matteri Electric | Troy Scott Matteri | — | (707) 980 1942 | Electricians | Petaluma · Sonoma County | — | — |
| Matthew Chase Woodworks INC | Matthew Zane Lenahan | — | (415) 410 6558 | Other | Petaluma · Sonoma County | — | — |
| Matthew Gregorchuk General Building Contractor | Matthew Gregorchuk General Building Contractor | — | (805) 856 8899 | GC, remodel, ADU | Santa Rosa Valley · Sonoma County | — | — |
| Matthew J Etimos Electric INC | Matthew James Etimos | — | (707) 494 1855 | Electricians | Santa Rosa · Sonoma County | — | — |
| Matthew Mckenzie Construcion | Matthew Mckenzie Construcion | — | (707) 292 8710 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Matthew Rex Barnard | Matthew Rex Barnard | — | (707) 525 4660 | Pool | Sebastopol · Sonoma County | — | — |
| Mattie's Hardwood Flooring Co Corp | John Walker Mattie | johnmattie@gmail.com | (707) 953 9663 | Other | Petaluma · Sonoma County | — | — |
| Maudlin Drywall INC | Kevin John Maudlin | — | (707) 578 8273 | Other | Windsor · Sonoma County | — | — |
| Maus Electric | Rodney Walter Maus | — | (707) 762 4831 | Electricians | Petaluma · Sonoma County | — | — |
| Maus Electric Company | Ryan James Maus | — | (707) 974 2021 | Electricians | Petaluma · Sonoma County | — | — |
| Maus Electric INC | Wesley Garnett Maus | — | (707) 292 0994 | Electricians | Windsor · Sonoma County | — | — |
| Maverick Excavating INC | Vincent James Dean Herring | — | (707) 975 4911 | Other | Santa Rosa · Sonoma County | — | — |
| Max Construction | Kurt Hugh Kissmann | — | (707) 299 9083 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Max Ivey Construction | Max Scott Ivey | — | (707) 324 9609 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Max Luepke | Max Luepke | — | (661) 476 7112 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Maxfield Bala Creative LLC | Maxfield Russell Bala-Rasmussen | — | (707) 971 0814 | Windows, patio, painters | Petaluma · Sonoma County | — | — |