| Redwood Restoration INC | Michael Thomas Hoover | — | (707) 472 7447 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Redwood Ridge Construction | Santacruz Orozco Gerardo | — | (707) 272 4706 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Redwood Roofers | Lavery Murray | info@redwoodroofers.com | (707) 937 1700 | Other roofers | Mendocino · Mendocino County | — | — |
| Redwood Valley Gravel Products INC | Melvin Webster Ford | — | (707) 485 8585 | Other | Redwood Valley · Mendocino County | — | — |
| Reid Construction | Thomas Noel Reid | info@reidconstruction.com | (707) 391 3221 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Reliance Enterprises HVAC | Blake Joseph Bader | — | (707) 462 7279 | HVAC | Ukiah · Mendocino County | — | — |
| Rem Excavating | Rem Excavating | — | (707) 734 3031 | Other | Fort Bragg · Mendocino County | — | — |
| Rent A Man Handyman | Rent A Man Handyman | — | (707) 489 0486 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Renteria Construction | Renteria Valenzuela Jesus | — | (707) 409 4027 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Restoration Contractors | Mark Allan Heath | — | (415) 235 0987 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Rey Construction | Reynoso Mora Ismael | — | (707) 621 0356 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Reymar Villanueva | Reymar Villanueva | — | (707) 237 1231 | Windows, patio, painters | Ukiah · Mendocino County | — | — |
| Rg Construction | Gaona Cristian Rauda | — | (707) 941 1005 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Rg Electric | Rauda Gaona Cristian | impallari@gmail.com | (707) 357 1402 | Electricians | Fort Bragg · Mendocino County | — | — |
| Riboli & Sons General Contractor | Riboli & Sons General Contractor | — | (707) 292 6855 | GC, remodel, ADU | Point Arena · Mendocino County | — | — |
| Riccio Landscape Construction | Leonard John Riccio | — | (707) 272 7286 | Windows, patio, painters | Point Arena · Mendocino County | — | — |
| Rich Wilson Builders | Rich Wilson Builders | — | (707) 239 6755 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Richter's Tile | Richter's Tile | — | (707) 272 8375 | GC, remodel, ADU | Hopland · Mendocino County | — | — |
| Ricks Home Maintenance | Ricks Home Maintenance | — | (916) 224 2601 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Ridge Construction | Noah Kirti Sheppard | info@ridge-construction.com | (707) 813 8138 | GC, remodel, ADU | Mendocino · Mendocino County | — | — |
| Ridge Construction Company | Michael Peter Starr | info@ridge-construction.com | (707) 785 3850 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Ridge Walker Roofing | Juan Carlos Rodriguez Hurtado | — | (707) 548 9011 | Other roofers | Redwood Valley · Mendocino County | — | — |
| Ridgeline Construction And Management INC | Bryce Roger Poehlmann | — | (707) 513 6428 | GC, remodel, ADU | Albion · Mendocino County | — | — |
| Rigo's Best Roofing Services | Hernandez Martinez Rodrigo | — | (707) 621 9169 | Other roofers | Ukiah · Mendocino County | — | — |
| Rigoberto Medina | Rigoberto Medina | info@medinapaitingca.com | (707) 813 0887 | Windows, patio, painters | Fort Bragg · Mendocino County | — | — |
| Rob's Repair & Restoration | Rob's Repair & Restoration | — | (415) 300 7291 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Robert Allen Farley | Robert Allen Farley | — | (707) 272 7929 | Other | Gualala · Mendocino County | — | — |
| Robert Holyoake | Robert Holyoake | — | (707) 799 3952 | Electricians | Ukiah · Mendocino County | — | — |
| Robert's Flooring | Robert's Flooring | — | (707) 391 8426 | Other | Redwood Valley · Mendocino County | — | — |
| Robertson Enterprises | John Vergil Robertson | — | (707) 884 4924 | Other | Gualala · Mendocino County | — | — |
| Robin Bird | Robin Bird | — | (707) 895 9155 | Other | Philo · Mendocino County | — | — |
| Robinson Building INC | Kerry Loren Robinson | — | (707) 489 2778 | GC, remodel, ADU | Redwood Valley · Mendocino County | — | — |
| Robinson Plumbing | Robinson Plumbing | — | (707) 459 3212 | Other | Willits · Mendocino County | — | — |
| Roderick B Dewitt | Roderick B Dewitt | — | (707) 272 3183 | HVAC | Boonville · Mendocino County | — | — |
| Rodney Donald Usher | Rodney Donald Usher | — | (707) 462 5000 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Roger Fites | Roger Fites | — | (707) 964 0366 | Other | Fort Bragg · Mendocino County | — | — |
| Ron Pearson Landscaping | Ron Pearson Landscaping | — | (707) 462 3168 | Windows, patio, painters | Ukiah · Mendocino County | — | — |
| Ron's Quality Construction INC | Ronald Albert Valente | — | (707) 485 5688 | GC, remodel, ADU | Redwood Valley · Mendocino County | — | — |
| Ronald C Bostwick DBA Bostwick Electric | Ronald Christopher Bostwick | — | (707) 972 1583 | Electricians | Redwood Valley · Mendocino County | — | — |
| Ronald George Schultz | Ronald George Schultz | — | (707) 489 4430 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |