| Merino's Paint And Decorating INC | Raul Anibal Merino Argueta | — | (510) 948 9686 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Merlo Stone INC | David Louis Merlo | — | (925) 820 8099 | Other | San Ramon · Contra Costa County | — | — |
| Merlyn Construction | Arturo Enedino Jimenez Merlyn | merlyn.construction810@gmail.com | (415) 583 9514 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Metabuilt Construction LLC | Charles Theodore Roberts | — | (925) 464 6112 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Metalset INC | Steven Michael Davis | info@metalset.com | (510) 233 9998 | Other | Richmond · Contra Costa County | — | — |
| Metamorphosis Construction | Juan Carlos Sanchez Bustos | — | (925) 768 1992 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Metricon Homes INC | Robert Jordan Sorensen | info@metriconhomes.com | (714) 717 7858 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Metro Elevator Northern California INC | Kevin Thomas Wright | — | (415) 656 7347 | Other | Concord · Contra Costa County | — | — |
| Metropolitan Van And Storage INC | David William Smart | — | (707) 745 1150 | Other | Martinez · Contra Costa County | — | — |
| Mex-stone Landscape | Mex-stone Landscape | — | (925) 754 9180 | Windows, patio, painters | Oakley · Contra Costa County | — | — |
| Meza Painting LLC | Juan Ramon| Meza Garcia Ramon Ramon Meza Garcia | — | (510) 875 5479 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Mf3 Construction | Mario Michael Iii Feusier | +1mario@mf3construction.com | (925) 212 4514 | GC, remodel, ADU | Moraga · Contra Costa County | — | — |
| Mg Painting Contractor | Mg Painting Contractor | — | (510) 829 0135 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Mg Signature Landscapes | Mg Signature Landscapes | mgsignaturescapes@gmail.com | (510) 691 2548 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Mgb Pipe Works INC | Michael Gerard Beierle | — | (510) 219 0061 | Other | Walnut Creek · Contra Costa County | — | — |
| Mgh Roofing Concepts | Michael Gerard Haller | — | (925) 625 4914 | Other roofers | Oakley · Contra Costa County | — | — |
| Mh Master Flooring | Chuquiyauri Martin Hernandez | — | (925) 436 9301 | Other | Antioch · Contra Costa County | — | — |
| Mh Nissi Builders INC | Melvin Adaly Martinez Moran | — | (510) 686 0301 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Mi Casa Construction | Juarez Rolando | — | (925) 766 4470 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Mia Remodeling INC | Douglas Clay Harman | — | (213) 436 8550 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Michael Anthony Tenuto | Michael Anthony Tenuto | — | (925) 451 1242 | Other | Discovery Bay · Contra Costa County | — | — |
| Michael Bluth Construction | Michael Anthony Bluth | — | (949) 510 8404 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Michael Bondi Metal Design INC | Michael Livio Bondi | — | (510) 236 2607 | Other | Richmond · Contra Costa County | — | — |
| Michael Brett | Michael Brett | — | (650) 740 8993 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Michael Clancy Construction | Michael Patrick Clancy | — | (925) 785 0202 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Michael Connors | Michael Connors | — | (510) 451 8569 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Michael F Reibin DBA Duke Construction | Michael Fredrick Reibin | — | (415) 686 6155 | GC, remodel, ADU | Moraga · Contra Costa County | — | — |
| Michael F Roach | Michael F Roach | — | (818) 939 4411 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Michael G Mc Kim Company | Matthew Gregg Mckim | — | (510) 222 6640 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Michael H Day Const Co | Michael Harvey Day | — | (925) 202 9496 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Michael J Arruda Construction | Michael James Arruda | — | (925) 798 5635 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Michael J Doyle | Michael J Doyle | — | (925) 837 5406 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Michael J Langon DBA Langone Construction | Michael John Langon | — | (925) 785 6934 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Michael J Slater | Michael J Slater | — | (925) 586 2928 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Michael James Construction INC | Michael James Andrews | — | (925) 935 4838 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Michael Kitko Construction | Michael David Kitko | — | (408) 591 5874 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Michael Lemaster Construction | Michael Bruce Lemaster | — | (925) 820 8123 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Michael Lester Skinner | Michael Lester Skinner | — | (925) 207 1834 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Michael M Construction INC | Michael John Manson | — | (925) 705 3025 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Michael Mc Curdy | Michael Mc Curdy | — | (510) 541 8049 | Electricians | Pleasant Hill · Contra Costa County | — | — |