| M G Construction & Repair | Geul Mike | — | (707) 704 9514 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| M G Plastering & General Contractor | Manuel Cuadra Galvan | — | (707) 290 2023 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| M G Tile INC | Ruiz Margarito Guzman | — | (707) 863 2212 | Other | Fairfield · Solano County | — | — |
| M I J All Plastering Systems | Israel Jesus Mendieta | — | (707) 704 6160 | Other | Suisun · Solano County | — | — |
| M J Welding INC | Manuel Acosta Zarate | — | (925) 787 9443 | Other | Suisun City · Solano County | — | — |
| M R & Sons Construction Corporation | Moises Ramirez | — | (415) 368 7147 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| M S H Iron Works | M S H Iron Works | info@mshironworks.com | (707) 685 3204 | Other | Dixon · Solano County | — | — |
| M S Painting | M S Painting | — | (707) 803 1258 | Windows, patio, painters | Vacaville · Solano County | — | — |
| M T Z Construction INC | Jose Luis Martinez | erick@mtzconstruction.com | (707) 688 9686 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| M Tabbert INC DBA Bayside Electric | Michael John Tabbert | — | (707) 753 1884 | Electricians | Suisun City · Solano County | — | — |
| Macmillan Electrical Construction | Bryan Scott Mac Millan | — | (707) 741 5159 | Electricians | Benicia · Solano County | — | — |
| Macmun Drywall | Macmun Drywall | macmunhernandez@gmail.com | (707) 372 4635 | Other | Vallejo · Solano County | — | — |
| Maddi's Maintenance And Construction Services | Scott Patrick Maddi | — | (707) 816 0020 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Mahoney Construction | Craig Wayne Mahoney | — | (707) 330 8990 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Maintenance Works | Amy Lynn Nuccio | — | (707) 317 9570 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Maltsberger Mechanical | Maltsberger Mechanical | — | (510) 229 7576 | HVAC | Vacaville · Solano County | — | — |
| Man Cave America LLC | Henry Liu | — | (415) 505 4303 | Electricians | Vallejo · Solano County | — | — |
| Mana Construction INC | Nancy Carolinda Cabrera | — | (510) 426 0604 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Mana Electric INC | William Oscar Waples | — | (510) 426 0604 | Electricians | Vallejo · Solano County | — | — |
| Manases Defiesta | Manases Defiesta | — | (707) 315 7011 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Manning Construction | Luke Alexander Manning | interested@domainmarket.com | (925) 951 7511 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Manny's Home Services | Manuel De Jesus Tavison | — | (707) 514 8302 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Marasigan Heating And Air | Symond Saba Marasigan | — | (707) 419 4460 | HVAC | Fairfield · Solano County | — | — |
| Marc Builders Llcdbamarc Engineering | Jose Antonio Ruiz Cervantes | — | (510) 938 3033 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Marc Parham Painting | Marc Parham Painting | — | (707) 646 1624 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Marianne Grubb Landscaping | Marianne Grubb Landscaping | — | (707) 731 9400 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Marin Floor Design | Marin Floor Design | — | (408) 607 9351 | Other | Vallejo · Solano County | — | — |
| Mark Alkire DBA Mark Alkire Construction | Mark Paul Alkire | — | (707) 746 1628 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Mark Anthony Ghiorzo | Mark Anthony Ghiorzo | — | (707) 249 4310 | Other | Vacaville · Solano County | — | — |
| Mark Brothers General Contracting | Jonathan Mark Brothers | — | (707) 419 9002 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Mark Brule The Decorative Painter | Mark Brule The Decorative Painter | — | (925) 275 6335 | Windows, patio, painters | Benicia · Solano County | — | — |
| Mark Christopher Pracanica | Mark Christopher Pracanica | — | (707) 553 3091 | Other | Benicia · Solano County | — | — |
| Marquez General Contractor INC | Leonel Marquez | — | (510) 417 9157 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Marroquin's General Construction INC | Calles Salvador Marroquin | — | (510) 381 9178 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Marsh Rat Tractor | Marsh Rat Tractor | — | (707) 592 8138 | Other | Fairfield · Solano County | — | — |
| Marshland Construction | Cody James Hays | — | (767) 761 7985 | Other | Vacaville · Solano County | — | — |
| Martin Construction | Steven Allen Martin | — | (707) 628 5446 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Martin Excavating | Martin Excavating | — | (916) 997 3424 | Other | Vacaville · Solano County | — | — |
| Martin's Metal Fabrication & Welding INC | Charlotte Evon Martin | — | (707) 678 4117 | Other | Vacaville · Solano County | — | — |
| Martin's Steel Works INC | David Earl Martin | bids@martinssteelworks.com | (707) 678 6120 | Other | Vacaville · Solano County | — | — |