| M T General Contractor | M T General Contractor | — | (510) 614 7643 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| M T P Painting & Decorating | Michael Lee Sparling | — | (650) 271 1320 | Windows, patio, painters | Hayward · Alameda County | — | — |
| M W C & Associates | Cheng Man-wah | — | (925) 330 8256 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| M W Dowell Painting | M W Dowell Painting | — | (650) 917 0399 | Windows, patio, painters | Newark · Alameda County | — | — |
| M&a Mechanical Service LLC | Serbio Tulio Melgar | — | (925) 270 0353 | HVAC | Livermore · Alameda County | — | — |
| M&a Ultra Quality Painting | M&a Ultra Quality Painting | — | (925) 395 8768 | Windows, patio, painters | Hayward · Alameda County | — | — |
| M&d Brothers Construction | Jose Ernesto Guardado Leiva | — | (510) 467 7790 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M&g Grading & Excavation | Tanner Ruben Gomes | — | (925) 980 2256 | Other | Livermore · Alameda County | — | — |
| M'mazel Contractor And Homeservices INC | Miguel Angel Hernandez | — | (650) 271 1377 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| M1 Mechanical Corp | Sean Blair Shervais | — | (415) 579 4129 | HVAC | Castro Valley · Alameda County | — | — |
| M5 Services LLC | Nicholas James Haycock | — | (925) 232 1719 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Mac Built | Conor Patrick Mc Enroe | info@macbuilt.com | (510) 473 7750 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mac Electric | Szilagyi George | — | (510) 791 0738 | Electricians | Fremont · Alameda County | — | — |
| Mac Iron INC | Zi Heng Ma | — | (510) 356 8497 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Mac's Construction | Mark Alan Mc Namee | — | (510) 435 5188 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Maciel Electric | Daniel Mendoza Maciel | — | (408) 228 7651 | Electricians | Hayward · Alameda County | — | — |
| Maciel Gardens | Maciel Gardens | — | (510) 207 1743 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Maciel Roofing Construction INC | Antonio Maciel | — | (510) 785 9276 | Other roofers | Hayward · Alameda County | — | — |
| Mack5 | Eve D Nelson | — | (510) 595 3020 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mackay Professional Services | Frederick Matthews Mackay | — | (510) 773 3436 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mackenzie Landscape Gardening LLC | Roberta Sue Meldrum | — | (510) 889 1310 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Macleod Design & Construction INC | Ian Douglas Macleod | — | (510) 486 2317 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Made 2 Measure | Made 2 Measure | — | (510) 468 1404 | Other | Livermore · Alameda County | — | — |
| Madigan Fine Building | Madigan Fine Building | — | (415) 609 6110 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Madrone Builders | Ry Canyon Miller | — | (510) 292 5017 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Madsen Builders INC | Jody Michael Madsen | — | (510) 943 4353 | Other | Fremont · Alameda County | — | — |
| Maf Plastering Corporation | Moises Isai Lopez | — | (510) 200 1897 | Other | Oakland · Alameda County | — | — |
| Magdave Associates | David Kanu Edu | — | (510) 633 7998 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Magic Electric | Jose Merlin Chinchilla Navarrete | info@magic-electric.com | (416) 505-2058 | Electricians | Berkeley · Alameda County | — | — |
| Magic Gardens Landscaping | Magic Gardens Landscaping | — | (510) 420 1328 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Magnergy Construction | Gelacio Enrique Cid Barquin | — | (510) 427 9739 | Electricians | Oakland · Alameda County | — | — |
| Magnificent Construction Company | Lau David | — | (408) 640 6152 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Magnificient Construction | Juan Luis Velasco Gonzalez | — | (510) 850 0068 | Electricians | Oakland · Alameda County | — | — |
| Magno Painting INC | Jose Alejandro Garcia Martinez | — | (510) 927 5716 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Magno's Construction Services | Alberto Magno Acevedo Osorio | — | (510) 921 4714 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Magnum Construction | Charles William Jr Beigarten | — | (925) 998 3058 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Mahbubian Construction | Mahbubian Mohsen | — | (510) 910 2015 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Mai Landscape | Mai Landscape | — | (925) 216 5746 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Mainstream Electric INC | Duy Phuong Ly | — | (408) 898 7919 | Electricians | Hayward · Alameda County | — | — |
| Mainstreet Repairs | Timothy Paul Fehr | — | (510) 520 5205 | GC, remodel, ADU | Oakland · Alameda County | — | — |