| Marcelius Construction INC | Donovan Douglas Marcelius | — | (707) 696 3043 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Marcie's Cleaning Service | Martinez Marcelina | — | (707) 433 0721 | Other | Healdsburg · Sonoma County | — | — |
| Marciel Construction | Mark Anthony Marciel | — | (707) 338 5090 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Marco Coton Painting INC | Marco Antonio Coton | info@marcocotonpainting.com | (415) 410 8822 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Marden Construction Co | David Colby Marden | — | (707) 829 5588 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Mares Landscaping Management | Mares Landscaping Management | — | (707) 328 8206 | Windows, patio, painters | Healdsburg · Sonoma County | — | — |
| Marin Construction | John Robert Fraser | johnfraser52@gmail.com | (707) 814 4102 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Marin Mci Remodeling INC | Marcelino Rodriguez | — | (415) 226 8864 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Marin Republic Construction | Cesar Humberto Covarrubias | cesarcovar@gmail.com | (415) 302 3855 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Mario Contreras Roofing Co | Contreras Mario | mario95409@att.net | (707) 540 2592 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Mario Monterrosa Electric INC | Monterrosa Mario | — | (415) 368 1608 | Electricians | Guerneville · Sonoma County | — | — |
| Mark Cheavacci Custom Cabinetry & Millwork | Mark Ray Cheavacci | — | (707) 477 2914 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Mark Ciddio Wood Works & Construction INC | Mark Steven Ciddio | — | (707) 292 5465 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Mark D Silva Enterprises DBA M D S Construction | Mark Dean Silva | — | (707) 838 4085 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Mark Dean Sedgwick | Mark Dean Sedgwick | — | (707) 575 8942 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mark E Gnat General Contractor | Mark E Gnat General Contractor | — | (707) 536 7911 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mark Latimer & Associates INC DBA Coda Technology Group | Eric Paul Short | — | (707) 795 3522 | Electricians | Petaluma · Sonoma County | — | — |
| Mark Madden Drywall INC | Mark Patrick Madden | — | (707) 938 0348 | Other | El Verano · Sonoma County | — | — |
| Mark Mc Intosh | Mark Mc Intosh | — | (707) 538 1609 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mark Thurlow Builders | Mark Thurlow Builders | — | (707) 528 7786 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mark Tindley Woodworking | Mark Tindley Woodworking | — | (707) 331 2223 | Other | Santa Rosa · Sonoma County | — | — |
| Mark William Abel | Mark William Abel | — | (707) 484 7204 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mark's Garage Doors | Mark's Garage Doors | — | (707) 981 7140 | Other | Petaluma · Sonoma County | — | — |
| Marks Plumbing | Marks Plumbing | — | (707) 996 0977 | Other | Boyes Hot Springs · Sonoma County | — | — |
| Marlboro Construction Company | Veronica Figueroa | — | (707) 843 7886 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Marovich Homes INC | Michael Anthony Marovich | — | (707) 280 7125 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Marquez Landscape | Denise Michelle Marquez | reginomarquez51@gmail.com | (707) 694 1217 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Marr B Olsen INC | Marr Barry Olsen | — | (707) 763 9707 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Marsh Painting LLC | Richard Duane| Marsh Rick Duane Marsh | agustinamingote@gmail.com | (707) 773 1068 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Marshall Electric Company | Nicholas John Marshall | — | (707) 836 5702 | Electricians | Santa Rosa · Sonoma County | — | — |
| Marshall Painting | Marshall Painting | — | (707) 566 8080 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Marshall Vincent Company | Marshall Kent Vincent | — | (707) 975 2381 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Marshall White Construction INC | Charles Angelo Kniss | info@marshallwhiteconstruction.com | (415) 532 7827 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Marshalls Plumbing | Marshalls Plumbing | — | (707) 681 1011 | Other | Santa Rosa · Sonoma County | — | — |
| Martin Construction | Efrain Jr Martin | — | (707) 802 8368 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Martin Construction | Allen Ray Martin | — | (707) 393 1664 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Martin Custom General Engineering INC | Sean Patrick Martin | — | (707) 480 3041 | Other | Santa Rosa · Sonoma County | — | — |
| Martin Electric & HVAC | Benjamin James Martin | — | (415) 699 4040 | HVAC | Petaluma · Sonoma County | — | — |
| Martin Graf | Martin Graf | — | (707) 206 5625 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Martin Landscaping INC | Martin Romo Daniel | — | (707) 590 0760 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |