| Mike Flynn Painting Old & New INC | Michael Patrick Flynn | — | (707) 426 2745 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Mike's Heating And Air Conditioning | Mike's Heating And Air Conditioning | — | (707) 718 6014 | HVAC | Fairfield · Solano County | — | — |
| Milano Construction INC | Duy Thanh Pham | — | (707) 642 1237 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Milestone Painting | Milestone Painting | — | (707) 389 0312 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Mill-wood Designs LLC | Michael Willard Wood | — | (801) 946 1743 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Millcreek Builders INC | Sean Michael Carroll | — | (925) 595 6263 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Mills Floors | Bryon Dodson Mills | — | (707) 290 6179 | Other | Vacaville · Solano County | — | — |
| Millwork Systems | Millwork Systems | — | (707) 372 2313 | Other | Fairfield · Solano County | — | — |
| Milton Painting & Restoration | Milton Painting & Restoration | milton.espinoza@ymail.com | (415) 377 7205 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Mining Management International INC | Frank Robert Vezer | — | (707) 435 8082 | Other | Fairfield · Solano County | — | — |
| Mirador Construction INC | Daniel Joseph Koelzer | — | (707) 301 8933 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Mirandas Roofing Partnership | Luis Raul Miranda | — | (707) 694 3912 | Other roofers | Vacaville · Solano County | — | — |
| Mitch Strong Construction Company | Mitchell Hubert Strong | — | (707) 372 0184 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Mjb Construction Services | Matthew James Bassett | — | (530) 218 7875 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Mjc Enterprises | Michael James Campbell | — | (707) 448 6777 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Mnj Builders INC | Thomas Omar Mathers | — | (707) 290 2669 | Electricians | Dixon · Solano County | — | — |
| Mobele Communications | Mobele Communications | — | (925) 766 9589 | Other | Vacaville · Solano County | — | — |
| Mobius Works | Mobius Works | — | (707) 334 8050 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Moench Construction Company INC | James Arthur Moench | — | (925) 766 5914 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Molina Build & Design INC | Cesar Edgardo Molina | — | (510) 804 4255 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Molina Electric | Gerardo Jose Antonio Molina Torres | — | (510) 890 8322 | Electricians | Vallejo · Solano County | — | — |
| Monarch Tile | Monarch Tile | — | (707) 689 2385 | Other | Fairfield · Solano County | — | — |
| Montes Bros Construction INC | Luis Carlos Jr Montes | — | (707) 863 1061 | Other | Suisun City · Solano County | — | — |
| Montoya Radiant Heating Co | Ramnar Luis Figueroa Montoya | — | (707) 208 4429 | HVAC | Fairfield · Solano County | — | — |
| Moore Construction Milestones | Christopher Michael Moore | — | (925) 864 3503 | GC, remodel, ADU | Rio Vista · Solano County | — | — |
| Moore Electric | William Richard Moore | interested@domainmarket.com | (707) 689 8012 | Electricians | Vacaville · Solano County | — | — |
| Morcorp INC | William Ira Jr Morgan | — | (707) 451 9588 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Moreno INC | Michael Charles Moreno | — | (707) 759 2459 | Other roofers | Fairfield · Solano County | — | — |
| Moreno Painting INC | Moreno Alejandro | — | (707) 580 1989 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Moreno Trenching Ltd | Jon Gilbert Moreno | — | (707) 374 5075 | Other | Rio Vista · Solano County | — | — |
| Moreno's Construction | Pelayo Pedro Moreno | — | (530) 908 8094 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Morgan Fence And Awning | Robert William Morgan | — | (707) 428 3302 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Morgan Fence Company INC | Steven Eugene Morgan | info@morganfence.com | (707) 427 6159 | Other | Fairfield · Solano County | — | — |
| Morley Baker | Morley Baker | — | (510) 714 2480 | Other | Vacaville · Solano County | — | — |
| Morrison Plumbing | Morrison Plumbing | — | (707) 761 7337 | Other | Vacaville · Solano County | — | — |
| Mossy Oaks Construction | Aguilar Enrique | — | (707) 752 7233 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Mount Vaca Drywall | Mount Vaca Drywall | — | (707) 975 6534 | Other | Vacaville · Solano County | — | — |
| Mountain Bay Builders | Mountain Bay Builders | — | (415) 246 6397 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Mountain Tree Service | Timothy Irwin Miner | — | (707) 330 4688 | Tree | Vacaville · Solano County | — | — |
| Mp Painting | Mp Painting | — | (707) 495 0592 | Windows, patio, painters | Fairfield · Solano County | — | — |