| R Meier Construction | Richard Allen Meier | — | (805) 207 5592 | Other | Ojai · Ventura County | — | — |
| R Meyer Associates INC | Roger William Meyer | — | (805) 551 7285 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| R P Barricade INC | Richard Ii Penhallow | — | (805) 499 6605 | Other | Newbury Park · Ventura County | — | — |
| R P Construction | Parga Robert | — | (805) 760 2992 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| R P Painting | R P Painting | — | (805) 816 0521 | Windows, patio, painters | Fillmore · Ventura County | — | — |
| R Pace Construction | Ronald Jay Pace | — | (805) 624 2561 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| R R Bartley Associates INC | Richard Randolph Bartley | — | (510) 502 5556 | Windows, patio, painters | Westlake Village · Ventura County | — | — |
| R R Electric Heating & Air | Ricardo Antonio Rogero | — | (800) 510 4740 | HVAC | Moorpark · Ventura County | — | — |
| R S Busch Construction | Ronald Steven Busch | — | (805) 750 1944 | Other | Ventura · Ventura County | — | — |
| R S Electric Service | Sandoval Ronald | — | (323) 273 2988 | HVAC | Simi Valley · Ventura County | — | — |
| R S Jagoe Construction | Ryan Scott Jagoe | — | (805) 341 9525 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| R S Masonry | R S Masonry | — | (805) 497 4455 | Other | Thousand Oaks · Ventura County | — | — |
| R Stephenson & Sons INC | Ronald Roy Stephenson | — | (805) 490 4907 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| R T Abbott Construction INC | Roy Terence Abbott | — | (805) 581 9043 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| R T C Plastering | R T C Plastering | — | (805) 368 9702 | Other | Ventura · Ventura County | — | — |
| R T Framing Corporation | Raymond Albert Fuess | — | (805) 496 3985 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| R W Construction | Robert Ulysses White | — | (805) 732 4089 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| R W Shattuck INC | Robin William Shattuck | — | (805) 499 3400 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| R W Shattuck Millworks Etc | R W Shattuck Millworks Etc | — | (805) 499 3400 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| R Works | R Works | — | (805) 843 9247 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| R-land Construction INC | Ricardo Jimenez Esparza | julioroa@rlandconstruction.com | (805) 331 4984 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| R.e.g Electric LLC | Ronald Andrew Steven Jr Nelinger | — | (805) 529 8802 | Electricians | Thousand Oaks · Ventura County | — | — |
| R2ros Plumbing | R2ros Plumbing | — | (805) 680 9546 | Other | Santa Paula · Ventura County | — | — |
| R3 Electric INC | Ryan Lewis Myers | — | (714) 330 2240 | Electricians | Camarillo · Ventura County | — | — |
| Ra General Contractors | Robert Simon Ashjian | — | (619) 535 5981 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Rabin General Construction INC | Richard Alan Rabin | — | (818) 445 1524 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Radiant Communications | John Daniel Martin | — | (805) 304 7636 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Radiant Home Automation | Benjamin Charles Lustgarten | — | (818) 610 9054 | Other | Westlake Village · Ventura County | — | — |
| Radiant Ridge Roofing INC | Sergio Armando Salguero | — | (805) 587 9652 | Other roofers | Simi Valley · Ventura County | — | — |
| Radon Solutions California LLC | Edward Frank Huchingson | — | (805) 908 9274 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Rafael Rj Custom Painting | Rafael Rj Custom Painting | rafarjcustompainting@gmail.com | (805) 236 9107 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Rafael's Artistic Construction | Joshua Rafael Juarez | — | (805) 469 6722 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Rafi Khardalian | Rafi Khardalian | — | (818) 515 3421 | Other | Westlake Village · Ventura County | — | — |
| Raiden Electric INC | Carlos Roberto Rauda Rivera | — | (805) 914 3502 | Electricians | Santa Paula · Ventura County | — | — |
| Railworks INC | Paul Herbert Ostrow | — | (805) 492 8058 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Rainbow Landscape | Rainbow Landscape | — | (805) 443 1952 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Rainbow Painting | Rainbow Painting | — | (805) 208 1194 | Windows, patio, painters | Santa Paula · Ventura County | — | — |
| Ralph Ray Construction Corporation | Ralph Lee Ray | — | (805) 624 7717 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Ram - Aire | Ram - Aire | wacareyna@mac.com | (818) 706 3358 | HVAC | Westlake Village · Ventura County | — | — |
| Ram - Z Construction INC | Jose Estrada Ramirez | daniel@ramzconstruction.com | (805) 526 3684 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |