| Magana Construction | Magana Magana Raul | — | (707) 490 2045 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Magana Electric INC | Magana Adalberto | — | (707) 339 0324 | Electricians | Sonoma · Sonoma County | — | — |
| Maganda Construction | Michael Gregory Myers | greenbuilder61@gmail.com | (707) 322 2798 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Maggie's Dad Landscape | Maggie's Dad Landscape | — | (707) 318 6936 | Windows, patio, painters | Cloverdale · Sonoma County | — | — |
| Magic Metal Ornamental Fabrication | Magic Metal Ornamental Fabrication | — | (707) 529 3441 | Other | Petaluma · Sonoma County | — | — |
| Magic Surface Refinishing And Repair | Magic Surface Refinishing And Repair | — | (707) 539 7977 | Other | Santa Rosa · Sonoma County | — | — |
| Maginn Windows & Glass | Patrick Lynch | — | (415) 939 9111 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Magnum HVAC | Magnum HVAC | — | (707) 332 6158 | HVAC | Rohnert Park · Sonoma County | — | — |
| Magnus Electric | Jose Domingo Herrera | info@magnuselectric.com | (415) 250 4661 | Electricians | Rohnert Park · Sonoma County | — | — |
| Mahre Contracting INC | Sean Michael Mahre | sean@mahreinc.com | (707) 479 1105 | Electricians | Graton · Sonoma County | — | — |
| Main Street Place Corp | Marc Alan Negri | — | (707) 573 5941 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Majestic Awning & Canopy | Majestic Awning & Canopy | — | (707) 528 3277 | Other | Santa Rosa · Sonoma County | — | — |
| Majestic Builders & Contracting Corporation | Charles Ray Hinaman | — | (707) 795 6823 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Majestic Painting | Majestic Painting | — | (707) 829 7540 | Windows, patio, painters | Sebastopol · Sonoma County | — | — |
| Major Alarm INC | Steven Robert Ameral | info@majoralarminc.com | (707) 559 5636 | Electricians | Petaluma · Sonoma County | — | — |
| Major Innovation Construction Company | David Warren Major | — | (707) 480 6923 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Mak Builders | Mak Builders | — | (707) 321 9262 | GC, remodel, ADU | Glen Ellen · Sonoma County | — | — |
| Mak Engineering INC | Glen Carl Mak | astigma@astigmatic.com | (707) 938 5394 | Other | Sonoma · Sonoma County | — | — |
| Maky's Home Pro Construction INC | Leonides Macario Luis-Munoz | makyshomepro@outlook.com | (707) 364 1902 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Maldonado Painting INC | Luis Fernando Maldonado Rocha | maldonadochaypainting@yahoo.com | (707) 230 8430 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Maldonado Tile And Stone | Maldonado Tile And Stone | — | (707) 721 5325 | Other | Sonoma · Sonoma County | — | — |
| Mallary Painting INC | Sean Michael Mallary | — | (707) 570 7111 | Windows, patio, painters | Forestville · Sonoma County | — | — |
| Malmberg's Painting | Malmberg's Painting | — | (707) 849 2944 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Maloney Construction | Joseph Michael Maloney | mattmaloneyconstruction@gmail.com | (707) 239 8832 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Mancini Construction | Kirk Owen Mancini | interested@domainmarket.com | (707) 695 4290 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Mandeno Construction INC | Gordon Andrew Mandeno | — | (707) 889 0476 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Mangiantini Home Design And Build | Mangiantini Home Design And Build | — | (707) 996-2261 | Restoration | Sonoma · Sonoma County | — | — |
| Mann Excavating | Mann Excavating | mark@mannexcavating.com | (707) 799 4711 | Other | Windsor · Sonoma County | — | — |
| Mann Excavating INC | Mark Daniel Mann | mark@mannexcavating.com | (707) 799 4711 | Other | Windsor · Sonoma County | — | — |
| Manning Construction INC | Ian Joseph Manning | interested@domainmarket.com | (707) 332 9997 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Manor Development Co | Pamela Jean Miles | — | (707) 526 2551 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Manos Construction | Jay Franklin Manos | — | (415) 987 4654 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Mansell Electric | Britton Keneth Mansell | — | (510) 290 5150 | Electricians | Sebastopol · Sonoma County | — | — |
| Manta Ray Pool Service | Franklin Jon Prior | — | (707) 481 4804 | Pool | Petaluma · Sonoma County | — | — |
| Manuel Ramirez Salazar | Manuel Ramirez Salazar | — | (707) 540 4067 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Manzanita Landscape Construction INC | James Roland Guay | — | (707) 575 3775 | GC, remodel, ADU | Fulton · Sonoma County | — | — |
| Manzo Construction LLC | James Edward Kelley | — | (707) 480 8914 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Manzoni Trucking & Excavating INC | William Jay Manzoni | — | (707) 996 3685 | Other | Sonoma · Sonoma County | — | — |
| Mape Electric | Perdomo Martin | martin@mapeelectric.com | (707) 236 7174 | Electricians | Cotati · Sonoma County | — | — |
| Marc Anthony Dailey | Marc Anthony Dailey | — | (707) 322 1030 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |