| Mendocino's Finest Construction | Alicia Maria Tlelo Martinez | — | (707) 272 7392 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Mendoza Electric | Mendoza Roberto | — | (707) 484 2600 | Electricians | Ukiah · Mendocino County | — | — |
| Menton Builders INC | Robert Estok Menton | aimee@mentonbuilders.com | (707) 468 8814 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Merlati Painting | Merlati Painting | — | (707) 884 4836 | Windows, patio, painters | Gualala · Mendocino County | — | — |
| Metal Fabrication & Design | Phillip Joseph Munch | — | (707) 984 9310 | Other | Laytonville · Mendocino County | — | — |
| Meyer General Engineering Contractor | Meyer General Engineering Contractor | — | (707) 972 4661 | Other | Ukiah · Mendocino County | — | — |
| Micah Sanger At Visionary Arts Gallery | Micah Sanger At Visionary Arts Gallery | — | (505) 455-2867 | Windows, patio, painters | Mendocino · Mendocino County | — | — |
| Michael A Melia | Michael A Melia | — | (707) 513 3703 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Michael Balderrama | Michael Balderrama | — | (707) 684 6300 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Michael D Ray | Michael D Ray | — | (707) 272 3194 | Windows, patio, painters | Ukiah · Mendocino County | — | — |
| Michael James Casey Construction | Michael James Casey | — | (707) 937 4097 | GC, remodel, ADU | Mendocino · Mendocino County | — | — |
| Michael L Rogers General Building Contractor | Michael Lee Rogers | — | (707) 489 1481 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Mike Dunn Painting | Mike Dunn Painting | — | (707) 621 2706 | Windows, patio, painters | Ukiah · Mendocino County | — | — |
| Mike Luparello INC | Michael Damien Luparello | — | (707) 357 4834 | Other | Philo · Mendocino County | — | — |
| Mike Meuschke Construction | Michael Wayne Meuschke | — | (707) 357 7032 | GC, remodel, ADU | Mendocino · Mendocino County | — | — |
| Mike P Normoyle | Mike P Normoyle | — | (707) 409 0808 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Mill Creek Nursery INC DBA Mill Creek Landscape | Brad Dominic Turri | — | (707) 972 1747 | Windows, patio, painters | Ukiah · Mendocino County | — | — |
| Miller Construction | Joshua David Miller | — | (707) 734 3809 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Mindful Climate LLC | Gabriel Kyle Spier | — | (707) 391 1773 | HVAC | Ukiah · Mendocino County | — | — |
| Mitch Nelson Construction | Mitchell Austin Nelson | — | (707) 964 6591 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Mobley Comfort Solutions Heating & Cooling INC | Mark Allen Mobley | — | (707) 391 8999 | HVAC | Ukiah · Mendocino County | — | — |
| Momentum Construction Forever INC | Alexander Quinten-Lee Cross | — | (707) 513 7713 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Moreno Plumbing | Moreno Plumbing | — | (707) 391 7320 | Other | Redwood Valley · Mendocino County | — | — |
| Moretti Materials Corp | Daniel John Moretti | — | (707) 975 3953 | Other | Hopland · Mendocino County | — | — |
| Morning Dew Enterprise | Morning Dew Enterprise | — | (707) 217 7974 | GC, remodel, ADU | Albion · Mendocino County | — | — |
| Morris Construction | John Edward Morris | — | (707) 272 7086 | GC, remodel, ADU | Hopland · Mendocino County | — | — |
| Morse Construction | Kirt Brooks Morse | — | (707) 489 2581 | GC, remodel, ADU | Philo · Mendocino County | — | — |
| Mountain Craft | Mountain Craft | interested@domainmarket.com | (530) 214 6211 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Mountain Craft INC | Gabriel Aaron Shacter | interested@domainmarket.com | (530) 214 6211 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Mountain House Mechanical | Mountain House Mechanical | — | (707) 670 0275 | HVAC | Hopland · Mendocino County | — | — |
| Murphy Construction | Collin Richard Murphy | interested@domainmarket.com | (707) 495 9477 | GC, remodel, ADU | Point Arena · Mendocino County | — | — |
| Mys Timothy General Building Contractor | Mys Timothy General Building Contractor | — | (707) 459 8744 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Nailor's Plumbing Service | Brandon Everett Nailor | — | (707) 357 2419 | Other | Fort Bragg · Mendocino County | — | — |
| Newhall Excavation | Newhall Excavation | — | (707) 684 9652 | Other | Gualala · Mendocino County | — | — |
| Next Gen Roofing | Jeffrey Jordan Piver | info@nextgenroofing.com | (707) 367 3614 | Other roofers | Ukiah · Mendocino County | — | — |
| Next Generation Heating & Cooling | Next Generation Heating & Cooling | — | (707) 485 0112 | HVAC | Ukiah · Mendocino County | — | — |
| Nick Barbieri Trucking LLC | David Manuel Gomez | — | (707) 463 3100 | Other | Ukiah · Mendocino County | — | — |
| Nick Bertolino | Nick Bertolino | — | (707) 486 1513 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Nick's Backhoe Service | Dominic Victor Bergera | — | (707) 272 1574 | Other | Redwood Valley · Mendocino County | — | — |
| Nickel Creek Landscapes & Design | Nickel Creek Landscapes & Design | — | (707) 972 1902 | Windows, patio, painters | Ukiah · Mendocino County | — | — |