| Quality Finish Painting INC | Rios Francisco Sandoval | — | (209) 810 7210 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Quality Glass | Klaus Peter Gruettner | — | (209) 474 6653 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Quality Home Improvement | Quality Home Improvement | — | (209) 481 0380 | GC, remodel, ADU | French Camp · San Joaquin County | — | — |
| Quality Insulation Services INC | Lucatero Javier Ramirez | — | (209) 276 8400 | Other | Tracy · San Joaquin County | — | — |
| Quality Landscape | Quality Landscape | — | (209) 810 2071 | GC, remodel, ADU | Thornton · San Joaquin County | — | — |
| Quality Perfect Painting | Quality Perfect Painting | — | (209) 518 2043 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Quality Plumbers INC | Marty William Galindo | — | (209) 952 0656 | Other | Stockton · San Joaquin County | — | — |
| Quality Pools | Quality Pools | — | (209) 595 3245 | Pool | Escalon · San Joaquin County | — | — |
| Quality Repair & Maintenance | Quality Repair & Maintenance | — | (209) 607 9444 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Quality Service | Thomas Allen Mc Coy | — | (209) 838 7842 | Other | Escalon · San Joaquin County | — | — |
| Quality Sound | Christopher Ian Hyndman | — | (209) 948 2104 | Electricians | Stockton · San Joaquin County | — | — |
| Quaschnick Electric | Todd Forrest Quaschnick | — | (209) 969 4087 | Electricians | Lodi · San Joaquin County | — | — |
| Queirolo's Heating & Air Conditioning INC | David Rodney Queirolo | — | (209) 464 9658 | HVAC | Stockton · San Joaquin County | — | — |
| Quen Commercial Repair And Construction | Wong Quen Quentin | — | (209) 951 4342 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Quezada's Masonry | Quezada's Masonry | ramonquezada.86@gmail.com | (209) 405 4811 | Other | Stockton · San Joaquin County | — | — |
| Quintero & Hakimi Builders | Noorrahman Wais | — | (510) 316 9551 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| R & A Construction | Roger Charles Fibrow | — | (209) 851 0203 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| R & B Protective Coatings INC | Richard Eddie Joaquin | — | (209) 887 2030 | Windows, patio, painters | Linden · San Joaquin County | — | — |
| R & C Electric | Raja Subhi Hamdan | — | (813) 452 0014 | Electricians | Tracy · San Joaquin County | — | — |
| R & M Construction | Robin Christopher Magin | — | (209) 983 8799 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| R & M Mobile LLC | Joshua Ray Cross | — | (209) 932 8747 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| R & R Construction | Robert Richardson Terrell | — | (209) 327 3562 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| R & R Fencing | R & R Fencing | — | (209) 233 4074 | Other | Lodi · San Joaquin County | — | — |
| R & R Mechanical | R & R Mechanical | — | (209) 271 1027 | HVAC | Stockton · San Joaquin County | — | — |
| R & V Refrigeration INC | Raul Cardenas Varela | — | (650) 222 5363 | HVAC | Tracy · San Joaquin County | — | — |
| R + R Campa Construction | Campa Rosendo | — | (209) 406 9311 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| R A Jones Construction | Robert Ashley Jones | — | (925) 525 6311 | GC, remodel, ADU | Thornton · San Joaquin County | — | — |
| R A Venable Tile | R A Venable Tile | — | (209) 405 7313 | Other | Manteca · San Joaquin County | — | — |
| R B HVAC INC | Rahul Bhanot | — | (209) 351 6000 | HVAC | Stockton · San Joaquin County | — | — |
| R C Custom Carpentry | R C Custom Carpentry | info@rccustomcarpentry.com | (209) 400 8279 | Other | Lodi · San Joaquin County | — | — |
| R D Concrete Construction Co INC | Rogelio Avila Diaz | — | (209) 482 2839 | Other | Stockton · San Joaquin County | — | — |
| R E Construction | Ray Royce Jr Ek | — | (510) 917 4546 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| R F Wilson Construction | Raymond Francis Wilson | — | (510) 703 6160 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| R Fernandez Drywall | R Fernandez Drywall | — | (408) 794 9995 | Other | Tracy · San Joaquin County | — | — |
| R G Construction | Sandy Lue Moore | — | (209) 597 4741 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| R General Construction | Herrera Rodriguez Ruben | — | (209) 597 4320 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| R Heritage Renovations INC | Mitchell Haynes Ruiz | — | (209) 855 1921 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| R J Construction Pros INC | Berrelleza Derick Jimenez | — | (510) 200 3096 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| R J Quenzel | R J Quenzel | — | (209) 333 2883 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| R L Electric LLC | Roberto Ortega Lopez | — | (209) 276 6956 | Electricians | Tracy · San Joaquin County | — | — |