| R M A Company | Mendoza Raul | — | (209) 751 9386 | Other | Stockton · San Joaquin County | — | — |
| R M Builders Construction | Manuel Reyes | — | (925) 420 3740 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| R M C Plumbing | R M C Plumbing | — | (209) 612 0456 | Other | Manteca · San Joaquin County | — | — |
| R M D Woodworking | R M D Woodworking | — | (408) 390 5684 | Other | Lodi · San Joaquin County | — | — |
| R M Flooring INC | Rogelio Valencia Morales | — | (209) 810 5709 | Other | Lodi · San Joaquin County | — | — |
| R Mendoza Drywall | R Mendoza Drywall | — | (209) 608 6338 | Other | Stockton · San Joaquin County | — | — |
| R N Cleaning Service | Ranviv Sanjay Singh | — | (925) 961 9077 | Other | Tracy · San Joaquin County | — | — |
| R P Painting Specialists | R P Painting Specialists | — | (209) 271 1765 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| R Routon INC | Robert Anthony Routon | — | (209) 943 5156 | Other | Stockton · San Joaquin County | — | — |
| R Sandoval Landscaping INC | Roberto Sandoval | — | (209) 570 1150 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| R T T Construction | Robert Tugadi Tacsion | — | (209) 610 1713 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| R Terry Construction | Richard Allan Terry | — | (209) 479 6205 | GC, remodel, ADU | Lockeford · San Joaquin County | — | — |
| R Vargas Construction INC | Torres Ricardo Vargas | — | (408) 425 8811 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| R Vega Plastering | R Vega Plastering | — | (209) 640 5323 | Other | Stockton · San Joaquin County | — | — |
| R Villa Flooring INC | Escalante Raul Villa | — | (510) 282 2451 | Other | Tracy · San Joaquin County | — | — |
| R W E Industrial Company | James Lowry Epperson | — | (209) 887 2216 | GC, remodel, ADU | Linden · San Joaquin County | — | — |
| R W S Tile | R W S Tile | — | (209) 483 0269 | Other | Stockton · San Joaquin County | — | — |
| R Watkins Construction | Robert Lee Watkins | eben@eyebytes.com | (209) 329 2531 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| R&s Electric & Builders INC | Julio Cesar Romero | info@rselectricbuilders.com | (323) 633 7074 | Electricians | Tracy · San Joaquin County | — | — |
| R's Tree Care INC | Rosario Angel Garcia | rstreecare209@aol.com | (209) 346 8443 | Tree | Manteca · San Joaquin County | — | — |
| R-line Insulation Incorporated | Rafael Chavez | — | (209) 470 4494 | Other | Stockton · San Joaquin County | — | — |
| R-pro Painting | R-pro Painting | — | (209) 224 1984 | Windows, patio, painters | Woodbridge · San Joaquin County | — | — |
| R4 Electric Co INC | Rodolfo R Rodriguez | — | (209) 608 0093 | Electricians | Stockton · San Joaquin County | — | — |
| Rachelle Marie Souza | Rachelle Marie Souza | — | (209) 825 0825 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Rafael Iniguez Jr | Rafael Iniguez Jr | — | (209) 670 5514 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Rafael Reynoso Ruvalcaba | Rafael Reynoso Ruvalcaba | — | (510) 427 0540 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Ragsdale's Heat & Air LLC | Adam Scott Ragsdale | — | (209) 633 6332 | HVAC | Escalon · San Joaquin County | — | — |
| Rainbow General Construction Co | Tony Phuoc Do | — | (408) 691 2921 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Rainforest Nursery Construction Landscaping | Schambeck Jonas | — | (209) 910 1903 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Raj Roofing Co | Ramirez Garcia Rafael | — | (209) 817 7739 | Other roofers | Stockton · San Joaquin County | — | — |
| Rakesh Singh | Rakesh Singh | — | (209) 487 3343 | Other | Stockton · San Joaquin County | — | — |
| Ram Concrete INC | Juan Luis Castaneda Santoyo | — | (209) 445 4512 | Other | Manteca · San Joaquin County | — | — |
| Rama Builders INC | Manuel De Jesus Alaniz | — | (209) 915 2016 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Ramirez Flooring Design & Install INC | Juan Jesus Ramirez | — | (510) 575 5167 | Other | Tracy · San Joaquin County | — | — |
| Ramiz General Building | Ramiz General Building | — | (209) 598 8078 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Ramon Garcia Roofing | Ramon Garcia Cruz | — | (510) 798 6624 | Other roofers | Tracy · San Joaquin County | — | — |
| Ramos Granite & Quartz Installations | Ramos Granite & Quartz Installations | — | (925) 339 0374 | Other | French Camp · San Joaquin County | — | — |
| Randall Mark Dockery | Randall Mark Dockery | — | (925) 383 0487 | Other | Lodi · San Joaquin County | — | — |
| Range & Associates | James Edward Range | — | (209) 367 8552 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |
| Rango Roofing Company | Juan Manuel Franco | rangoroofingco@gmail.com | (209) 513 4187 | Other roofers | Stockton · San Joaquin County | — | — |