| Marco Salgado Construction | Marco Antonio Salgado | — | (510) 512 0630 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Marco Tree Service | Marco Antonio Ortiz | — | (510) 568 8873 | Tree | Oakland · Alameda County | — | — |
| Marcos Alejandre Precision Builders LLC | Marcos Alejandre | — | (510) 706 5036 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Marcos Martinez Velasco | Marcos Martinez Velasco | — | (510) 229 3711 | Electricians | Oakland · Alameda County | — | — |
| Marcotte Homes | Marcotte Homes | — | (929) 337 9933 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Marcus Lyons General Contractor | Marcus Lyons General Contractor | — | (510) 332 3580 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mardigras Electric Co | Mardigras Robert | — | (510) 334 2460 | Electricians | Castro Valley · Alameda County | — | — |
| Margaret Dorothy Hall | Margaret Dorothy Hall | — | (510) 522 4552 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Margarita's Landscape Co | Juan Manuel Pacheco | — | (510) 427 6854 | Windows, patio, painters | Union City · Alameda County | — | — |
| Marichals Pest Control | Marichals Pest Control | — | (510) 388-3644 | Pest, tile roofs | Alameda · Alameda County | — | — |
| Marin Pinte | Marin Pinte | — | (773) 727 2102 | Electricians | Hayward · Alameda County | — | — |
| Marina Mechanical Services | Carna Marie Phillips | — | (510) 614 3500 | HVAC | Livermore · Alameda County | — | — |
| Marino Sumano Plumbing | Marino Sumano Plumbing | — | (650) 575 9138 | Other | Newark · Alameda County | — | — |
| Mario Mendoza | Mario Mendoza | — | (510) 270 5840 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Mario Osorio | Mario Osorio | — | (510) 469 4256 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Mario Santilli Construction Company | Santilli Mario | — | (510) 839 5353 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mariposa Designs & Construction | Denise Elaine Wharton-morris | — | (415) 971 9800 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Mariposa Gardening & Design Cooperative INC | Andrea Anna Woloschuk | — | (510) 891 1835 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Mariusz Construction | Mariusz Dariusz Krubnik | — | (510) 499 1475 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Mark A Hemenez General Contractor | Mark A Hemenez General Contractor | — | (510) 889 7710 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Mark Dills INC | Mark Nicholas Dills | — | (510) 526 8733 | Tree | Berkeley · Alameda County | — | — |
| Mark Dobel Painting & Restoration | Mark Dobel Painting & Restoration | — | (510) 589 9297 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Mark Hankins Construction INC | Mark Allen Hankins | — | (510) 795 9654 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Mark Ikels | Mark Ikels | — | (415) 238 1231 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Mark Kalman | Mark Kalman | — | (510) 703 7918 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Mark Leal Painting Company | Mark Joseph Leal | — | (510) 612 1800 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Mark Lee And Yong Kay INC DBA Bay Construction Co | Ricardo Camacho | — | (510) 658 7225 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mark Schantz | Mark Schantz | mschantz2020@gmail.com | (510) 551 8788 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Mark Skovronski Flooring | Mark Skovronski Flooring | — | (510) 928 3986 | Other | Newark · Alameda County | — | — |
| Mark Sluka Construction | Sluka Marek | — | (510) 325 0901 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Mark Stanchina Masonry | Mark Stanchina Masonry | — | (510) 606 0177 | Other | Castro Valley · Alameda County | — | — |
| Marlowe Kent Construction | Kent Marlowe | — | (510) 520 2059 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Marquez Fencing INC | Adonis Brown Avington | — | (510) 767 7698 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Marroquin's Roofing | Mario David Marroquin | — | (510) 850 5222 | Other roofers | San Leandro · Alameda County | — | — |
| Marsh Interiors | Marsh Interiors | hello@marshinteriors.com | (510) 547 7540 | Other | Oakland · Alameda County | — | — |
| Marshall Brothers Enterprises INC | Phillip Wayne Marshall | — | (925) 449 4020 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Marsica Construction | Gian Arcadio Marianella | — | (650) 787 8232 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Martin & Michael Construction INC | Liu Michael | — | (510) 773 8766 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Martin Electric | Anthony Richard Martin | — | (510) 227 4319 | Electricians | Fremont · Alameda County | — | — |
| Martin J Bloom General Contractor | Martin J Bloom General Contractor | — | (510) 207 7446 | GC, remodel, ADU | Oakland · Alameda County | — | — |