| Martina Logan Tile | Martina Logan Tile | — | (707) 365 0841 | Other | Dixon · Solano County | — | — |
| Martinez Landscaping | Martinez Landscaping | — | (812) 344-8549 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Martucci Electric | Patrick Anthony Martucci | — | (925) 408 6878 | Electricians | Rio Vista · Solano County | — | — |
| Matchams's Painting | Matchams's Painting | — | (707) 448 8208 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Matei Construction | Matei Cornel | — | (510) 378 6623 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Matt Rutledge Construction | Matthew Allan Rutledge | — | (925) 250 0302 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Matthew Hechim | Matthew Hechim | — | (707) 469 7177 | Other | Vacaville · Solano County | — | — |
| Matthew M Brazelton | Matthew M Brazelton | — | (707) 337 9988 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Matthews Electric | William James Matthews | — | (707) 447 0836 | Electricians | Vacaville · Solano County | — | — |
| Matthews Metal Fabrication Incorporated | Bradly Scott Matthews | — | (281) 709 7997 | Other | Vacaville · Solano County | — | — |
| Maxicrete | Maximiano Jr Diaz | — | (707) 422 7994 | Other | Fairfield · Solano County | — | — |
| Mazovian Water Heaters | Rafal Daniel Strzelczyk | — | (707) 514 8026 | Other | Vacaville · Solano County | — | — |
| Mb Mechanical LLC | Michael Dale Blaich | — | (707) 580 0101 | HVAC | Dixon · Solano County | — | — |
| Mc Windows And Doors DBA Mc Windows And Glass Doors | Chelidze Mamuka | — | (408) 460 0803 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Mccafferty Brothers Plumbing LLC | David Anthony Mccafferty | — | (650) 359 3443 | Other | Dixon · Solano County | — | — |
| Mcveigh's Ornamental Ironworks | Mcveigh's Ornamental Ironworks | — | (707) 637 6840 | Other | Vacaville · Solano County | — | — |
| Md INC | Rene Amilcar Torres | — | (707) 863 1061 | Other | Fairfield · Solano County | — | — |
| Medina Concrete & Pavers INC | Sergio Francisco Medina-leyva | — | (510) 306 8523 | Other | Vallejo · Solano County | — | — |
| Medina Electric | Silvio Leonardo Medina | — | (510) 660 5724 | Electricians | Vacaville · Solano County | — | — |
| Medina Plumbing & Radiant Heating INC | Medina Cesar | — | (916) 290 2230 | HVAC | Elmira · Solano County | — | — |
| Melby Construction | Leif John Melby | cmich1353@gmail.com | (510) 593 5168 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Melendez Millworks | Melendez Millworks | melendezmillworks@gmail.com | (707) 481 7690 | Other | Fairfield · Solano County | — | — |
| Melodie Bullock | Melodie Bullock | — | (707) 372 2725 | Other | Vacaville · Solano County | — | — |
| Mendoza Concrete INC | Jose Luis Mendoza Bucio | — | (707) 803 3343 | Other | Suisun City · Solano County | — | — |
| Mendoza's Home Improvement | Mendoza Gonzalez Francisco | — | (707) 720 5348 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Mer Avi | Reyes Michel Estrada | — | (707) 997 2220 | Other | Vallejo · Solano County | — | — |
| Mercy Electric | Dimas Enrique Palma Melgar | — | (415) 424 7812 | Electricians | Vallejo · Solano County | — | — |
| Meyerz Wirez INC | Jacob John Meyers | — | (707) 290 8930 | Electricians | Rio Vista · Solano County | — | — |
| Mez General Construction INC | Mehrzad Hazratizadeh | — | (925) 286 6066 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Meza Floors | Meza Floors | joeym@mezafloors.com | (707) 580 9459 | Other | Fairfield · Solano County | — | — |
| Mfernandez Construction INC | Marcos Humberto Fernandez | — | (707) 712 1213 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Mg And Jc Concrete INC | Ibarra Jairo Coronado | — | (415) 933 0031 | Other | Vacaville · Solano County | — | — |
| Mg Construction | Garcia Michael | info@mgconstruction.com | (707) 246 8964 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Michael Duke Construction | Michael Robert Duke | — | (707) 631 7995 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Michael P Devlin | Michael P Devlin | — | (707) 386 7850 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Michael Passaris | Michael Passaris | — | (415) 827 3059 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Michael Raymond Trice | Michael Raymond Trice | — | (707) 249 8190 | Other | Vacaville · Solano County | — | — |
| Michael's Landscape Construction | Michael Earle Mc Lane | m-mclane@sbcglobal.net | (925) 787 8964 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Mighty Men Construction INC | Frank Byron Hethcock | — | (925) 725 5392 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Miguel's Steam Cleaning INC | Miguel Angel Arana | — | (707) 449 9136 | Other | Vacaville · Solano County | — | — |