| R H Quality Painting | R H Quality Painting | — | (408) 836 9934 | Windows, patio, painters | Patterson · Stanislaus County | — | — |
| R J Commercial Flooring Company | Robert Stephen Jr White | — | (209) 408 0198 | Other | Modesto · Stanislaus County | — | — |
| R J L Construction INC | Robert Jerry Lutz | — | (209) 649 0950 | HVAC | Oakdale · Stanislaus County | — | — |
| R J Sutherland | R J Sutherland | — | (209) 524 7730 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| R M Electric | Ruben Sanchez Martinez | rme@rmelectric.com | (604) 299-0281 | Electricians | Ceres · Stanislaus County | — | — |
| R M H Construction | Ryan Michael Haynes | — | (209) 541 7972 | GC, remodel, ADU | Riverbank · Stanislaus County | — | — |
| R O W Custom Enterprise INC DBA Custom Pools & Remodeling | Roger Owen Whaley | — | (209) 537 6500 | Pool | Ceres · Stanislaus County | — | — |
| R P Landscaping | R P Landscaping | — | (209) 410 8617 | Windows, patio, painters | Waterford · Stanislaus County | — | — |
| R P Wilson Drilling | R P Wilson Drilling | — | (209) 495 7379 | Other | Riverbank · Stanislaus County | — | — |
| R Q I R Quality Installation | Arturo Lopez Robles | — | (209) 529 2980 | Other | Modesto · Stanislaus County | — | — |
| R V Concrete LLC | Roberto Carlos Vasquez | — | (209) 587 6149 | Other | Turlock · Stanislaus County | — | — |
| R Y Pro Painting | R Y Pro Painting | — | (209) 552 5630 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| R&g Drywall INC | Reyes Ramiro Orozco | — | (209) 481 4483 | Other | Patterson · Stanislaus County | — | — |
| R&t Painting Services LLC | Alexander Perry Rodriguez | — | (209) 681 6096 | Windows, patio, painters | Salida · Stanislaus County | — | — |
| R/c Solution Plumbing & Drain INC | Edgar Omar Rojo | — | (408) 460 3817 | Other | Modesto · Stanislaus County | — | — |
| R5 Group INC | Naresh Channaveerappa | — | (209) 846 9148 | Other | Modesto · Stanislaus County | — | — |
| Ra Construction | Robert Allen Alford | — | (209) 662 5100 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Radius Energy | Garrett Richard Brandt | — | (209) 550 1287 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| Ragsdale & Son INC | Robert Leon Ragsdale | — | (209) 874 2365 | Other | Waterford · Stanislaus County | — | — |
| Rainbow Restoration Of Mid Central Valley | Navdeep Singh Sandhu | — | (209) 284 6400 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Raintree Landscape | Raintree Landscape | — | (209) 575 3929 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Ralphs Fence And Supply | Ralphs Fence And Supply | — | (209) 416 2039 | Other | Modesto · Stanislaus County | — | — |
| Ram Mechanical INC | Luis Felipe Castaneda | info@ram-mechanical.com | (209) 531 9155 | Other | Ceres · Stanislaus County | — | — |
| Ram Pools & Spa Corp | Justo Avalos-Palacios | — | (916) 201 5852 | Pool | Modesto · Stanislaus County | — | — |
| Ramirez Flooring | Ramirez Flooring | — | (209) 614 7756 | Other | Salida · Stanislaus County | — | — |
| Ramsey Air | Ramsey Air | — | (209) 554 8100 | HVAC | Hughson · Stanislaus County | — | — |
| Ramson Piro Construction & Development INC | Piro Ramson | — | (209) 634 5700 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Rancano Construction | David Cuadra Rancano | — | (209) 324 9277 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Randal B Hurlburt | Randal B Hurlburt | — | (209) 602 4200 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Randy's Quality Roofing | Randy Allen Pachilis | — | (209) 918 4307 | Other roofers | Modesto · Stanislaus County | — | — |
| Rangel Fence Company | Rangel Samuel | — | (209) 535 4238 | Other | Denair · Stanislaus County | — | — |
| Raul's Glass Plus | Raul's Glass Plus | — | (559) 786 8655 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Ray's Radio Shop | Raymond Sabastian Iii Gada | — | (209) 521 9270 | Electricians | Modesto · Stanislaus County | — | — |
| Rayco Industrial Supply | Karen Jean Bostrom | — | (209) 529 8984 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Raynor Drywall | Raynor Drywall | — | (209) 404 8138 | Other | Hughson · Stanislaus County | — | — |
| Rays Carpet One Floor & Home | David Anthony Verissimo | — | (209) 577 5642 | Other | Modesto · Stanislaus County | — | — |
| Rb Construction | Richard Ernest Jr Buhl | — | (209) 499 0039 | GC, remodel, ADU | Riverbank · Stanislaus County | — | — |
| Rci Roofing Co | Bradley Scott Peterson | — | (209) 968 8990 | Other roofers | Modesto · Stanislaus County | — | — |
| Ready Air INC | Trae Matthew Sousa | — | (209) 345 7979 | HVAC | Modesto · Stanislaus County | — | — |
| Realty Design & Construction | Leslie Elizabeth Onsager | — | (209) 848 8728 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |