| M B Jessee Painting INC | Matthew Brian Jessee | — | (510) 655 7000 | Windows, patio, painters | Oakland · Alameda County | — | — |
| M B R | M B R | — | (510) 566 5251 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| M Bar M Excavation | Morgan Patrick Murphy | — | (510) 731 9967 | Other | Castro Valley · Alameda County | — | — |
| M Builders LLC | Mark Charles Sisneroz | hr@mbuilders.com | (925) 519 9500 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| M C H Electric INC | Tyler James Humphrey | — | (925) 453 5041 | Electricians | Livermore · Alameda County | — | — |
| M C Plumbing | M C Plumbing | — | (415) 203 2182 | Other | Alameda · Alameda County | — | — |
| M C R Construction | Matthew Christian Reinhart | — | (510) 414 2225 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| M C T Development & Construction | Michael Maurice O'callaghan | — | (925) 462 3785 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| M Construction & Design Incorporated | Travis Michael Coy | — | (510) 651 6981 | Electricians | Fremont · Alameda County | — | — |
| M D F Pipeline General Engineering Contractors INC | Manuel Marques De Freitas | — | (510) 427 7577 | Other | Dublin · Alameda County | — | — |
| M D H Construction | Mark David Henderson | — | (510) 517 9119 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M D Siever General Contractor | M D Siever General Contractor | — | (510) 677 7529 | Electricians | Hayward · Alameda County | — | — |
| M Design & Construction | Jill Alice Copeland | — | (925) 998 9802 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| M E B Electric | Matthew Elden Bassett | — | (510) 205 8362 | Electricians | Pleasanton · Alameda County | — | — |
| M E S | M E S | — | (925) 788 9473 | Electricians | Livermore · Alameda County | — | — |
| M E X Solutions | M E X Solutions | — | (650) 520 4816 | Other roofers | Hayward · Alameda County | — | — |
| M Farrocco INC | Morgan Philip Farrocco | — | (510) 402 3043 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M Flooring | M Flooring | — | (925) 598 9800 | Other | Pleasanton · Alameda County | — | — |
| M G Construction And Design | Mark William Gaul | — | (650) 799 6280 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M G Drywall | M G Drywall | — | (209) 605 5089 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M G M General Contractors | Genaro Enrique Munoz | — | (510) 828 6365 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| M G R Cleanup INC | Marcello Scavotto | — | (510) 683 6150 | Other | Fremont · Alameda County | — | — |
| M G Remediation INC | Peter Karl Mandel | — | (510) 293 3009 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| M G Simms Painting And Decorating | Michael Gary Simms | — | (510) 339 8889 | Windows, patio, painters | Oakland · Alameda County | — | — |
| M J Knuppe Development Company | Michael James Knuppe | — | (510) 714 4706 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| M J Tile | M J Tile | — | (510) 885 9816 | Other | Hayward · Alameda County | — | — |
| M L C Ventures INC | Paul Giannini Martin | — | (510) 886 7727 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| M L S Builder INC | Fook Hong Sham | — | (650) 534 7946 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M L S Plumbing And Builder INC | Fook Hong Sham | — | (650) 534 7946 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M Line Construction | Keivan Reza Abidi | — | (510) 333 3384 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| M M R Tech | M M R Tech | — | (818) 917 3746 | Other | Hayward · Alameda County | — | — |
| M Mc Bride Plumbing | M Mc Bride Plumbing | — | (510) 773 0002 | Other | Alameda · Alameda County | — | — |
| M N J Roofing INC | Myung Jun Song | mnjroofingco@gmail.com | (510) 733 6555 | Other roofers | Oakland · Alameda County | — | — |
| M P Remodeling Pro | M P Remodeling Pro | — | (510) 458 1362 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| M Perez Construction Services | Mario Marquez Perez | — | (510) 867 0815 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M Q Electrical | Manuel Anthony Quintero | — | (510) 776 8784 | Electricians | Alameda · Alameda County | — | — |
| M R C W Design/build | M R C W Design/build | info@mrcwdesignbuild.com | (510) 928 2904 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| M R S Roofing | Rojas Sanchez Moises | — | (510) 512 4759 | Other roofers | Hayward · Alameda County | — | — |
| M Star Construction | Peng Mengqiang | — | (510) 377 2645 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| M T Construction | Michael Francis Thompson | — | (925) 998 3730 | GC, remodel, ADU | Dublin · Alameda County | — | — |