| Mokastile INC | Felipe Arnoldo Ajiataz Puac | mokastile@gmail.com | (510) 427 1091 | Other | Oakland · Alameda County | — | — |
| Molina Plastering | Molina Plastering | — | (650) 477 9764 | Other | Hayward · Alameda County | — | — |
| Momentum Construction Cleanup | Juan Jose Avila | — | (510) 825 6452 | Other | San Leandro · Alameda County | — | — |
| Monarch Concrete | Eric Pedro Pacheco | — | (510) 755 9795 | Other | Hayward · Alameda County | — | — |
| Monarch Mechanical | Mark Fitzgerald Mckenna | — | (510) 400 7512 | HVAC | Oakland · Alameda County | — | — |
| Monarch Plumbing And Rooter INC | Jose Humberto Inguanzo | — | (510) 398 8478 | Other | Hayward · Alameda County | — | — |
| Mondo Building Company | Armondo Carlos Jr Smith | — | (415) 375 0257 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Monet's Garden | Monet's Garden | — | (510) 333 3345 | Windows, patio, painters | Albany · Alameda County | — | — |
| Montclair Construction & Structural INC | Carlo Yousef Khatchi | — | (510) 547 2457 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Monterey And Mwh Constructors A Joint Venture | Constructors INC Mwh | — | (510) 632 3173 | HVAC | Oakland · Alameda County | — | — |
| Monterey Mechanical Co | Jim Troup | — | (510) 632 3173 | HVAC | Oakland · Alameda County | — | — |
| Montoya Tile | Montoya Tile | montoyatile15@yahoo.com | (408) 661 7519 | Other | San Leandro · Alameda County | — | — |
| Montufar Residential Remodeling | Montufar Residential Remodeling | — | (925) 699 6702 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Moore Construction & Remodel INC | Dane Allen Moore | — | (510) 908 5306 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Moore Mechanical Heating And Air Conditioning | William Patrick Tassio | — | (888) 611 4328 | HVAC | Dublin · Alameda County | — | — |
| Moore Plumbing | Moore Plumbing | — | (510) 910 3586 | Other | San Leandro · Alameda County | — | — |
| Moore Residential Roofing INC | Terrence Rueben Moore | terrence@mooreresidentialroofing.com | (510) 589 0950 | Other roofers | Castro Valley · Alameda County | — | — |
| Mopia Electric LLC | Randy | — | (510) 288-2468 | Electricians | Castro Valley · Alameda County | — | — |
| Moraes Construction INC | Anderson Filho Moraes | — | (510) 706 2390 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Morales Plastering Construction | Morales Lazcano Alejandro | — | (510) 224 6969 | Other | Hayward · Alameda County | — | — |
| Moran Roofing And Inspection Company INC | James Walter Moran | — | (925) 454 9200 | Other roofers | Livermore · Alameda County | — | — |
| More Than A Carpenter | Raul Perez | — | (510) 559 1700 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Moreno Electric Co | Avalos Raul Moreno | luciano@latinotype.com | (510) 750 4924 | Electricians | San Leandro · Alameda County | — | — |
| Moreno Tree Services | Sanchez-moreno Herminio | — | (510) 209 0436 | Tree | Hayward · Alameda County | — | — |
| Morfin Painting Company | Morfin Miguel | — | (510) 862 1328 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Morgan Lodge INC DBA M L Electric | Morgan Lodge | — | (510) 537 6043 | Electricians | Castro Valley · Alameda County | — | — |
| Morgenroth Development INC | James Howard Morgenroth | info@morgenrothdevelopment.com | (925) 426 1015 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Morningside Builders | Morningside Builders | — | (925) 997 1010 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Mosaic Construction | Aron Scott Quiter | — | (510) 229 8505 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mosqueda Landscape INC | Gilberto Araujo Mosqueda | — | (408) 674 3282 | Windows, patio, painters | Newark · Alameda County | — | — |
| Mosto Construction | Rafael Javier Tobar | — | (510) 534 3152 | Other | Oakland · Alameda County | — | — |
| Mosvaler Construction INC | Rene Arnoldo Reyes Aguiluz | — | (650) 315 1389 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Mota Painting | Mota Painting | — | (510) 427 0875 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Mountain Air | Angela Maria White | sales@mountainair.net | (510) 453 2362 | HVAC | Livermore · Alameda County | — | — |
| Mountain Cascade INC | David Thomas Hicks | hr@mountaincascade.com | (925) 373 8370 | Other | Livermore · Alameda County | — | — |
| Mountain Concrete INC | Hamiltoni Eteaki | — | (650) 921 3392 | Other | San Leandro · Alameda County | — | — |
| Mountain Ridge Construction | Markus Anthony Sisneroz | — | (925) 967 5696 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Mountain Top Construction | Erich Francis Metzger | interested@domainmarket.com | (925) 980 7212 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Mp Glazing & Windows | Mp Glazing & Windows | — | (510) 862 4420 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Mp Quality Tile Installation | Mp Quality Tile Installation | — | (415) 724 8776 | Other | Alameda · Alameda County | — | — |