| Milo Electric | Dumeljic Milos | — | (831) 266 9964 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Milo Landscaping INC | Rodriguez Gildardo Rangel | — | (925) 584 9601 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Milton Navichoque Solorzano | Milton Navichoque Solorzano | — | (510) 815 0641 | Other | El Sobrante · Contra Costa County | — | — |
| Milz Development & Construction | Mark Steven Milz | — | (209) 743 6384 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Mim Flooring Alternatives INC | Islas Melquiades | — | (925) 584 0030 | Other | Antioch · Contra Costa County | — | — |
| Mindful Development INC DBA Mindful Construction INC | Cynthia Christine Torp | — | (510) 725 7777 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Ming K Construction INC | Ming K Yee | — | (415) 882 4511 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Ming-yau Chu | Ming-yau Chu | — | (925) 451 6172 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Mino Construction | John Aleck Jr Mino | — | (415) 298 1443 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Minor Miracles Construction | Jacob Devin Kipp | — | (510) 619 0777 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Mirab Electric | Mirabdokht Reza | — | (510) 776 1290 | Electricians | Concord · Contra Costa County | — | — |
| Miracle Building Maintenance | Miracle Building Maintenance | — | (510) 778 1880 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Miracle Method Of Contra Costa/alameda INC | David Bruce Gallagher | — | (925) 250 1071 | Windows, patio, painters | Clayton · Contra Costa County | — | — |
| Mircea Ilie Construction INC | Ilie Mircea | — | (510) 459 5502 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Mirza Landscaping INC | Mirza Tom | — | (925) 200 7171 | Windows, patio, painters | Danville · Contra Costa County | — | — |
| Mishal Builders And Contractors INC | Ali Saleh Mishal | — | (415) 726 1445 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Misty Morning Gardens INC | Christian Adams Ehrhorn | — | (510) 703 7020 | Windows, patio, painters | Lafayette · Contra Costa County | — | — |
| Miti Oak Construction | Brian Nghia Phan | — | (415) 917 0099 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Miuller Construction INC | Jose Francisco Nieves | — | (707) 635 3998 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Mizani Construction | Bijan Bagher Mizani | — | (925) 352 4526 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Mize Construction | Gregory Allan Mize | — | (786) 606 2482 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Mj Landscaping INC | Jose Garcia | — | (925) 588 9137 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| Mjl Landscaping | Mjl Landscaping | — | (925) 787 2220 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Mjr Construction | Michael Thomas Jr Royers | — | (925) 437 3527 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Mjt Construction Co | Manuel Jesus Tinoco Perez | — | (925) 421 3760 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Mk Masonry | Mk Masonry | — | (925) 383 7250 | Other | Clayton · Contra Costa County | — | — |
| Mk Pro Construction LLC | Francisco Javier Mendoza Gonzalez | javi@mkproconstruction.com | (925) 966 5538 | GC, remodel, ADU | Byron · Contra Costa County | — | — |
| Mka Constructors INC | Micheal Patrick Mcgarry | — | (925) 683 1557 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Mka International INC | Gerald Andrew Schneider | — | (925) 934 3235 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Mmm General Contractor INC | Masukic Mirsad | — | (510) 258 3139 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Mng Construction INC | Enkhtuguldur Sukhbaatar | — | (415) 794 2123 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Mobile Rain Gutters | Mobile Rain Gutters | — | (619) 318 8204 | Other | San Ramon · Contra Costa County | — | — |
| Mocanu Construction | Mocanu Gigi | — | (442) 245 4278 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Mod Comfort Solutions Heating And Air Conditioning | Daniel Iii Mendoza | — | (925) 250 0623 | HVAC | San Ramon · Contra Costa County | — | — |
| Modern Cabinets Enterprises | Tedesco Joseph | — | (925) 858 2261 | Other | Pittsburg · Contra Costa County | — | — |
| Modern City Builders INC | Ramiro Vasquezruiz | — | (415) 305 5820 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Modern Oak Landscaping | Modern Oak Landscaping | — | (925) 431 9276 | Windows, patio, painters | Knightsen · Contra Costa County | — | — |
| Modern Renovations Company | Janetha Aguilar | — | (925) 768 5669 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Modernscapes Innovations | Juan Manuel Orozco Sandoval | — | (925) 325 4046 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Modular Cement INC | Gary Eugene Harmer | — | (925) 849 6390 | Other | Alamo · Contra Costa County | — | — |