| Mrc Construction & Remodeling INC | Mark Anthony Cervantes | — | (949) 307 4754 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Mrc Construction INC | Chaidez Marisol Ramos | — | (714) 204 6188 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Mrd Painting INC | Mauricio Jr Bobadilla | — | (714) 300 5361 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Mrj Construction INC | Jose Juan Mendoza Reyes | — | (909) 518 7478 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Mrkd Group | Michael Robert Van Marel | — | (949) 209 7055 | Other | Wildomar · Riverside County | — | — |
| Mrls Plastering INC | Castillo Jorge Morales | — | (951) 836 3655 | Other | Riverside · Riverside County | — | — |
| Mrp Plumbing INC | Gutierrez Martin Olvera | — | (951) 259 5053 | Other | San Jacinto · Riverside County | — | — |
| Ms Concept Construction Pools | Marco Antonio Vela | — | (760) 702 1931 | Pool | Indio · Riverside County | — | — |
| Ms General Contractor LLC | Oscar Jr Hernandez Uscanga | — | (951) 420 4122 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Ms Painting | Ms Painting | — | (909) 496 3888 | Windows, patio, painters | Calimesa · Riverside County | — | — |
| Ms Quality Construction INC | Michael Jerrod Sevilla | — | (951) 816 5469 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Msg Construction INC | Gerzain Andaya-Pineda | — | (951) 213 9784 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Msm Patio & Rain Gutters INC | Michael Thomas Gray | — | (951) 296 7789 | Other | Murrieta · Riverside County | — | — |
| Msp Contractors | Jose Angel Martinez Sanchez | — | (760) 708 8148 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Msp Heating And Air LLC | Daniel Lee Contreras | — | (951) 255 9381 | HVAC | Riverside · Riverside County | — | — |
| Mt Construction | Michael Glenn Trembly | — | (909) 214 2614 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Mt Fencing INC | Misael Omar Trujillo Rojo | — | (951) 229 2019 | Other | Beaumont · Riverside County | — | — |
| Mtm INC DBA Valley Pacific Concrete | Kristi Marie Russo | — | (951) 672 6151 | Other | Menifee · Riverside County | — | — |
| Mtr Builder | Mtr Builder | — | (951) 530 6926 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Mts Landscape | Mts Landscape | — | (909) 782 5958 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Mtz Electric LLC | Marco Martinez | info@mtzelectric.com | (703) 819-9486 | Electricians | Corona · Riverside County | — | — |
| Mtz Renovations | Pita Brandon Martinez | — | (951) 623 4961 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Mufrance Professional Quality Flooring Installation | Mufrance Professional Quality Flooring Installation | — | (951) 529 6161 | Other | Perris · Riverside County | — | — |
| Muhlhauser Steel INC | Terry Camille Gibboney | — | (909) 877 2792 | Other | Murrieta · Riverside County | — | — |
| Mulch Masters | Patrick O'malley Mahoney | — | (951) 545 1662 | Windows, patio, painters | Corona · Riverside County | — | — |
| Mullaney Landscape | Mullaney Landscape | — | (714) 396 7388 | Windows, patio, painters | Temecula · Riverside County | — | — |
| Mullen Construction Company | Michael Scott Mullen | ed@mullenconstruction.com | (951) 428 6780 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Multi Colors Painting | Multi Colors Painting | — | (714) 391 5685 | Windows, patio, painters | Beaumont · Riverside County | — | — |
| Multiwire Electric | Ramon Villegas Farias | — | (626) 664 6327 | Electricians | Riverside · Riverside County | — | — |
| Munford Electric | Thomas Schon Munford | — | (619) 733 8732 | Electricians | Murrieta · Riverside County | — | — |
| Mungula's Masonry | Mungula's Masonry | — | (951) 348 2442 | Other | Riverside · Riverside County | — | — |
| Munoz Woodworks INC | Devyn Leigh Munoz | — | (951) 230 5102 | Other | Temecula · Riverside County | — | — |
| Murdica Electric INC | Gonzalez Gary | gary@murdicaelectric.com | (760) 565 3600 | Electricians | Palm Desert · Riverside County | — | — |
| Murillo Brothers Landscape INC | Jorge Armando Murillo | — | (760) 620 3272 | Windows, patio, painters | La Quinta · Riverside County | — | — |
| Murillos Nursery Landscaping Design INC | Antranik Krikor | — | (951) 293 0168 | Windows, patio, painters | Perris · Riverside County | — | — |
| Murphy Beds Of California INC | Susan Marie Lienau | — | (760) 776 5772 | Other | Palm Desert · Riverside County | — | — |
| Murphys Plumbing & Rooter | Murphys Plumbing & Rooter | — | (714) 606 8531 | Other | Riverside · Riverside County | — | — |
| Murr Co Plumbing | Michael Joseph Murr | — | (951) 487 1964 | Other | San Jacinto · Riverside County | — | — |
| Murrieta Development Company INC | Christene Close | — | (951) 719 1680 | Other | Temecula · Riverside County | — | — |
| Murrieta Glass And Shower | Murrieta Glass And Shower | — | (951) 973 1021 | Windows, patio, painters | Murrieta · Riverside County | — | — |