| Mr Lawn Landscaping | Mr Lawn Landscaping | — | (707) 333 0146 | Windows, patio, painters | Benicia · Solano County | — | — |
| Ms Tree Services INC | Suarez Salinas Maria | — | (415) 532 6816 | Other | Vallejo · Solano County | — | — |
| Msk Tile INC | Salvador Ruiz | — | (707) 761 4200 | Other | Suisun City · Solano County | — | — |
| Msr Mechanical LLC | James Sandborn Pape | eben@eyebytes.com | (925) 681 2797 | HVAC | Benicia · Solano County | — | — |
| Mtzwest Engineering Co | Mario Romeo Martinez-soto | — | (925) 395 0293 | Electricians | Vallejo · Solano County | — | — |
| Muehlhan Certified Coatings INC | Larry Owen Moore | — | (707) 639 4414 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Muehlhan Industrial Services INC | James Gary Brockman | — | (707) 639 4414 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Muerle Construction | Stephen John Muerle | muerlefam@comcast.net | (707) 372 5168 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Mundy Construction | Daniel Patrick Mundy | — | (415) 595 1575 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Munguia's Paving Stone | Munguia's Paving Stone | — | (916) 343 9638 | Other | Vacaville · Solano County | — | — |
| Munoz Concrete Services | Walter Joseph Munoz | — | (916) 548 1883 | Other | Dixon · Solano County | — | — |
| Munoz Landscapes | Munoz Landscapes | — | (707) 330 0513 | Windows, patio, painters | Dixon · Solano County | — | — |
| Munoz M Construction INC | Oscar Munoz | — | (707) 971 1000 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Murdock Construction | Richard Lane Murdock | thomas@murdockconstruction.ca | (707) 592 4968 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Murga Strange & Chalmers INC | Clark Shane Chalmers | — | (707) 643 9075 | Other | Vallejo · Solano County | — | — |
| Murphy Specialties INC | Asa Logan Murphy | — | (707) 761 8000 | Other | Vacaville · Solano County | — | — |
| Murray's HVAC Systems | Murray's HVAC Systems | — | (925) 899 6887 | HVAC | Vallejo · Solano County | — | — |
| Mustard Seed Painting | Mustard Seed Painting | — | (707) 280 4498 | Windows, patio, painters | Vacaville · Solano County | — | — |
| My Green Guardian | Philip Aaron Rogacki | info@mygreenguardian.com | (800) 240 8653 | Other | Vallejo · Solano County | — | — |
| Myers Cabinetry | Myers Cabinetry | — | (925) 639 8426 | Other | Fairfield · Solano County | — | — |
| N & M General Engineering INC | Nicholas James Anselmo | — | (707) 580 5859 | Other | Vacaville · Solano County | — | — |
| N & N General Construction | Noe Omar Barajas-Quezada | — | (707) 656 3054 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| N A S Electric | Steven George Moore | — | (707) 430 3791 | Electricians | Vacaville · Solano County | — | — |
| N American Roofing INC | Ivan Alejandro Rodriguez | — | (707) 624 5836 | Other roofers | Vacaville · Solano County | — | — |
| N B Landscaping | Nguyen Buu | — | (707) 853 9641 | Windows, patio, painters | Vallejo · Solano County | — | — |
| N C Home Improvement INC | Jorge Armando Munguia Godinez | — | (707) 712 4727 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| N S C Construction LLC | Neal S Celestino | nick.stunell@nscconstruction.com | (510) 909 5415 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Napa Solano Painting | Napa Solano Painting | — | (707) 580-2347 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Napa Valley Paving | Frank Junior Stanley | — | (707) 449 1512 | Other | Vacaville · Solano County | — | — |
| Napa Valley Pools Service & Repair | George Dominic Dragon | — | (707) 255 7946 | Pool | Fairfield · Solano County | — | — |
| Naranjo Irrigation INC | Nancy Angel Naranjo | — | (707) 342 9759 | Tree | Vallejo · Solano County | — | — |
| Nathan Trahern | Nathan Trahern | — | (510) 427 6067 | Other | Vacaville · Solano County | — | — |
| National Coating & Lining Company | Christopher Cannonball Osburn | — | (951) 471 3388 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Nativa Interiors | Nativa Interiors | — | (858) 794-0003 | Windows, patio, painters | Solana Beach · Solano County | — | — |
| Navavela Builder | Navavela Builder | — | (775) 291 1008 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Nc Pro Painting Corp | Nelson Balmore Serrano | — | (415) 583 1303 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Nelson Electric | Zachary Ronald Nelson | — | (707) 592 5499 | Electricians | Vacaville · Solano County | — | — |
| Nelson's Painting | Nelson's Painting | jon@nelsonspainting.com | (415) 608 7548 | Windows, patio, painters | Benicia · Solano County | — | — |
| Neri Brothers Construction | Daniel Joseph Neri | — | (916) 870 7299 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Netto Electrical Construction INC | Ernesto Jr Ramos | — | (707) 689 6565 | Electricians | Dixon · Solano County | — | — |