| M Construction Corp | Marvin Adonay Valle Miranda | — | (831) 325 3166 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| M D G Painting | M D G Painting | — | (831) 254 9955 | Windows, patio, painters | Corralitos · Santa Cruz County | — | — |
| M E Smith Building Specialties | M E Smith Building Specialties | — | (831) 900 8392 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| M H Builder | M H Builder | — | (831) 319 2583 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| M K Company | Michael Bernard Kilkenny | — | (831) 252 1518 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| M K M Construction | Mathew Karl Meier | — | (408) 318 4008 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| M Lee Brokaw General Contractor INC | M Lee| Brokaw Marshal Lee Brokaw | — | (650) 444 4141 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| M N Construction | Mark John Nesbitt | — | (831) 706 6961 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| M S Builders | M S Builders | info@msbuilders.com | (831) 246 1551 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| M S D Drywall | M S D Drywall | — | (831) 818 3111 | Other | Watsonville · Santa Cruz County | — | — |
| M T Construction Services | Michael Edourd Tzimbal | — | (831) 818 2064 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| M T M Truck & Tractor INC | Malcolm Tracy Miller | — | (831) 336 3600 | Other | Ben Lomond · Santa Cruz County | — | — |
| M Tapia Plumbing | M Tapia Plumbing | — | (831) 201 8414 | Other | Santa Cruz · Santa Cruz County | — | — |
| M V P General Contractor | M V P General Contractor | — | (831) 227 6028 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| M2 Painting | M2 Painting | — | (831) 431 9194 | Windows, patio, painters | Scotts Valley · Santa Cruz County | — | — |
| Machado Bros Painting INC | Sean Thomas Machado | — | (831) 331 8741 | Windows, patio, painters | Boulder Creek · Santa Cruz County | — | — |
| Machine King | Machine King | impallari@gmail.com | (831) 809 9057 | Other | Santa Cruz · Santa Cruz County | — | — |
| Macias Mechanical | Macias Mechanical | — | (831) 818 4753 | HVAC | Watsonville · Santa Cruz County | — | — |
| Mackin Drywall | Mackin Drywall | — | (831) 818 8070 | Other | Soquel · Santa Cruz County | — | — |
| Madera Building INC | Nestor Jaime Sanchez | — | (831) 227 0393 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| Maggiora Bros Drilling INC | David Thomas Maggiora | — | (831) 724 1338 | Other | Watsonville · Santa Cruz County | — | — |
| Magnolia Gardening Incorporated | Fabian Ramirez Cortez | — | (831) 400 8065 | Windows, patio, painters | Watsonville · Santa Cruz County | — | — |
| Magnum Engineering Construction Corporation | Steven Roe | — | (650) 969 7700 | Other | Capitola · Santa Cruz County | — | — |
| Main Construction | Jason Daniel Main | — | (831) 428 4357 | GC, remodel, ADU | Scotts Valley · Santa Cruz County | — | — |
| Malibu Painting | Malibu Painting | — | (831) 688 7400 | Windows, patio, painters | Aptos · Santa Cruz County | — | — |
| Mallory's Landscape | Mallory's Landscape | — | (831) 338 2689 | Windows, patio, painters | Boulder Creek · Santa Cruz County | — | — |
| Malmin Construction INC | Troy Louis Malmin | — | (831) 345 6830 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| Mandella Construction | John Jacob Mandella | — | (831) 246 0651 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Manning Development INC | Garrett James Manning | info@manningdevelopment.com | (831) 689 0400 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| Mans Construction Co | Keith Allen Mans | — | (831) 332 2214 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Mar Monte Vista Corporation | Todd Eric Baird | — | (831) 840 0292 | Windows, patio, painters | La Selva Beach · Santa Cruz County | — | — |
| Maragos Millwork & Design | Maragos Millwork & Design | — | (831) 419 9700 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Marathon Landscape Services | Dan Alan Johnson | — | (831) 462 3767 | Windows, patio, painters | Soquel · Santa Cruz County | — | — |
| Maravilla Plumbing | Maravilla Plumbing | — | (831) 254 0210 | Other | Watsonville · Santa Cruz County | — | — |
| Marc Dexel | Marc Dexel | — | (831) 406 0620 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| Marcus J Muccilli | Marcus J Muccilli | — | (831) 334 4716 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Marcus Marty Home Improvements | Marcus Marty Home Improvements | — | (831) 818 0514 | GC, remodel, ADU | Scotts Valley · Santa Cruz County | — | — |
| Marcus Wesley Leavitt | Marcus Wesley Leavitt | — | (831) 580 6002 | Windows, patio, painters | Aptos · Santa Cruz County | — | — |
| Marcus Zelmon Stone Work | Marcus Zelmon Stone Work | — | (831) 818 4892 | Other | Watsonville · Santa Cruz County | — | — |
| Mardeen Gordon | Mardeen Gordon | — | (831) 457 0115 | Other | Felton · Santa Cruz County | — | — |