| Roso Roofing LLC | Roberto Soria-Ayala | — | (209) 696 2634 | Other roofers | Stockton · San Joaquin County | — | — |
| Roterts Appl Repair | Roterts Appl Repair | — | (209) 943 2755 | HVAC | Stockton · San Joaquin County | — | — |
| Route 99 Floors | Route 99 Floors | — | (323) 945 8044 | Other | Lodi · San Joaquin County | — | — |
| Royal Dirt Works | Royal Dirt Works | — | (209) 607 7702 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Royal General Construction INC | Allen Ousip | — | (510) 921 0550 | GC, remodel, ADU | Mountain House · San Joaquin County | — | — |
| Rpg Electric LLC | Ronald Peter Glenn | — | (650) 930 6469 | Electricians | Stockton · San Joaquin County | — | — |
| Rs & S Construction LLC | Salinas Rodrigo | — | (209) 622 5044 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| Rs Property Services | Sherrill Ann Root | — | (510) 366 4378 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Rsa Construction & Renovation | Richard Paul St Angelo | — | (510) 480 7393 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Rt Western INC | Troy Anthony Saunders | — | (415) 677 9202 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Rube Electric | Salgado Villa Ruben | — | (510) 921 0114 | Electricians | Tracy · San Joaquin County | — | — |
| Ruben Alvarado Topete | Ruben Alvarado Topete | — | (408) 472 0076 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Rubio Communications INC | Luis Miguel Quintero Rubio | — | (209) 851 0104 | Other | Manteca · San Joaquin County | — | — |
| Rudy Arvizu Construction | Rodolfo Arvizu | — | (209) 747 7102 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Rudy's Electric | Rudy's Electric | — | (858) 353-2933 | Electricians | Solana Beach · San Joaquin County | — | — |
| Ruff Construction Company | Patrick William Ruff | — | (209) 609 8158 | GC, remodel, ADU | Lockeford · San Joaquin County | — | — |
| Ruff Plumbing | Patrick William Ruff | — | (209) 747 1694 | Other | Lockeford · San Joaquin County | — | — |
| Ruggaber Drywall INC | Freddie Dean Ruggaber | — | (209) 481 3491 | Other | Stockton · San Joaquin County | — | — |
| Ruiz Air | Ruiz Air | — | (707) 770 4243 | HVAC | Stockton · San Joaquin County | — | — |
| Ruiz Roofing Services INC | Ruiz-jaramillo Javier | — | (209) 910 1365 | Other roofers | Stockton · San Joaquin County | — | — |
| Runley Landscape Company | Jon Louis Runley | — | (925) 594 2974 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Rupp Construction INC | Zhongri Liu | mail@ruppconstruction.com | (408) 316 6074 | Electricians | Lathrop · San Joaquin County | — | — |
| Russ Air Conditioning & Heating Services | Russell Rudy Felix | — | (209) 513 8521 | HVAC | Stockton · San Joaquin County | — | — |
| Russell D Harris | Russell D Harris | — | (209) 481 4066 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Russell Heating & Air Conditioning INC | Nicholas Conrad Russell | — | (209) 407 2884 | HVAC | Tracy · San Joaquin County | — | — |
| Russell Lawrence Ray | Russell Lawrence Ray | — | (209) 931 9740 | HVAC | Stockton · San Joaquin County | — | — |
| Russell Wilson Construction | Russell Owen Wilson | — | (530) 828 2480 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Russo's Heating & Air Conditioning Company | Guy Anthony Russo | — | (209) 952 8647 | HVAC | Stockton · San Joaquin County | — | — |
| Ruth Exteriors Construction INC | Jonathan Martin Ruth | — | (209) 406 5016 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Ruvalcabo Paving INC | Rafael Orozco | — | (510) 200 3788 | Other | Tracy · San Joaquin County | — | — |
| Ryan's Plumbing | Ryan's Plumbing | — | (209) 688 6950 | Other | Stockton · San Joaquin County | — | — |
| Rz Flooring Systems INC | Daniel Antonio Rodriguez-Martell | — | (209) 456 0780 | Other | Stockton · San Joaquin County | — | — |
| S & S Concrete | S & S Concrete | — | (209) 603 7686 | Other | Lodi · San Joaquin County | — | — |
| S & T Appliance Installations LLC | Terry Joseph Murphy | — | (209) 614 8523 | Other | Ripon · San Joaquin County | — | — |
| S & W Electric | Stephen Alan Watson | — | (925) 998 2183 | Electricians | Stockton · San Joaquin County | — | — |
| S E A Company | Nunez Armando | — | (209) 649 5928 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| S F Builders | S F Builders | — | (209) 275 4748 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| S G Electric | Steve E Granlees | — | (209) 649 4696 | Electricians | Lockeford · San Joaquin County | — | — |
| S J S Const | S J S Const | — | (209) 612 1326 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| S M F Construction | Salesi Mafileo Foketi | — | (408) 600 7160 | Other | Manteca · San Joaquin County | — | — |