| Mcqueen Construction INC | Thomas Bruce Mcqueen | — | (925) 837 3680 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Mcrt Norcal Construction LLC | Jeffrey Clifford Schnurr | — | (650) 293 3560 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Md Companies Corp | Moises Benjamin Duran | — | (510) 807 7012 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Md Pro Wall INC | Santos Inocente Mendez Romero | — | (510) 368 5848 | Other | El Cerrito · Contra Costa County | — | — |
| Mdb Same Day HVAC INC | Mario David Balarezo | — | (925) 698 5915 | HVAC | Antioch · Contra Costa County | — | — |
| Mdc Builders INC | Michael David Candau | — | (925) 427 2264 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Mdm Welding And Fabrication | Maxwell Dudley Mccormack | — | (925) 628 5305 | Other | Antioch · Contra Costa County | — | — |
| Mdservices Garage Door & Gates INC | Michael Darmanov | — | (925) 344 3266 | Other | Walnut Creek · Contra Costa County | — | — |
| Meadowlark Woodworks | Meadowlark Woodworks | — | (925) 787 2394 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Mechpros Heating And Air Conditioning | Mechpros Heating And Air Conditioning | — | (925) 665 9003 | HVAC | Pacheco · Contra Costa County | — | — |
| Mectech Electric INC | Carlet Mesonge Enang | info@mectechelectric.com | (925) 307 6610 | Electricians | Pittsburg · Contra Costa County | — | — |
| Meda Fire Protection INC | Juan Carlos Beltran | — | (925) 808 8151 | Other | Concord · Contra Costa County | — | — |
| Medeiros Engineering | Joseph Raymond Medeiros | — | (510) 789 3348 | Other | Brentwood · Contra Costa County | — | — |
| Medina Concrete Group INC | Jafet Dagoberto Medina Longoria | — | (925) 752 4188 | Other | Pittsburg · Contra Costa County | — | — |
| Medina's Golden State Home Improvement INC | Rosario Vega Medina | — | (510) 730 5167 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Medo Usa INC | Randall David| Miller Randy Miller | — | (310) 351 0773 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Mega Tile Co | Mike Eugene Gilbert | — | (925) 382 7190 | Other | Pleasant Hill · Contra Costa County | — | — |
| Meier And Sons Roofing | Steven Dieter Meier | — | (888) 546 8362 | Other roofers | Concord · Contra Costa County | — | — |
| Meier Construction | Timothy Josh Meier | — | (510) 384 0050 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Mejia Construction | Mejia Lucero Lucio | — | (925) 759 9726 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Mejia Gardening INC | Ernesto Javier Mejia Jauregui | — | (925) 698 7228 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| Mejia's Construction | Mejia David | — | (925) 642 6808 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Mekasa General Contractor | Mekasa General Contractor | — | (415) 713 5165 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Melendez Painting | Melendez Painting | melqui@melendezpainting.com | (415) 271 3613 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Mellinger Construction INC | David James Mellinger | ericmellingerconst@gmail.com | (925) 820 4323 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Mellon Winslow LLC | Michael Isaac Mellon | — | (510) 872 4925 | Other | Richmond · Contra Costa County | — | — |
| Mellor Remodeling | Mellor Remodeling | — | (510) 926 2000 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Meloni Construction | David Eduardo Meloni | — | (510) 827 6614 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Melvin's Construction INC | Daniel Confesor Cifuentes Raymundo | — | (650) 271 1532 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Mem Construction | Michael Edward Murphy | — | (925) 368 5011 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Mendez Air Heating & Air Conditioning | Arturo Ochoa Mendez | — | (925) 381 3387 | HVAC | Oakley · Contra Costa County | — | — |
| Mendoza Builders INC | Edwin Adolfo Mendoza | — | (510) 917 1782 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Mendoza Construction | Cesar Corona Mendoza | — | (510) 292 0769 | GC, remodel, ADU | Crockett · Contra Costa County | — | — |
| Mendoza Galvan Flooring | Mendoza Galvan Flooring | — | (478) 225 7170 | Other | Pittsburg · Contra Costa County | — | — |
| Merbrink Construction INC | Donald Theodore Stewart | — | (925) 439 9200 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Mercoza | Jason Amador Duran Martinez | — | (510) 675 7971 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Mercury Heating And Air Conditioning INC | Jason Kenneth Corbett | — | (925) 233 5555 | HVAC | Brentwood · Contra Costa County | — | — |
| Merecon Custom Building | Merecon Custom Building | — | (510) 882 5489 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Meridian Electric | Scott Thomas Watkins | info@meridian-electric.com | (415) 994 8624 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Merino Landscape | Merino Landscape | — | (925) 349 6041 | Windows, patio, painters | Concord · Contra Costa County | — | — |