| Rodriguez Custom Building INC | Josue Gregorio Rodriguez | — | (805) 612 1601 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Rodriguez Paint & Finish INC | Juan Rodriguez | — | (805) 668 1118 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Roger L Smith INC | Roger Linn Smith | — | (805) 482 6009 | Pool | Camarillo · Ventura County | — | — |
| Roger Specter - Landscape Contractor Turfscapes Unlimited | Roger D Specter | — | (805) 646 6708 | Windows, patio, painters | Ojai · Ventura County | — | — |
| Roger Walker Floorcovering | Roger Walker Floorcovering | — | (805) 558 2844 | Other | Ojai · Ventura County | — | — |
| Roger Young | Roger Young | — | (818) 437 7949 | Electricians | Thousand Oaks · Ventura County | — | — |
| Roger's Painting | Roger's Painting | — | (805) 746 4110 | Windows, patio, painters | Moorpark · Ventura County | — | — |
| Roger's Plumbing | Roger's Plumbing | — | (805) 486 1005 | Other | Oxnard · Ventura County | — | — |
| Rogers Tile And Stone INC | James Scott Rogers | — | (805) 732 9102 | Other | Newbury Park · Ventura County | — | — |
| Rogers Tub Refinish | Jose Ariel Negron Lopez | — | (805) 279 7266 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Rohman Builders INC | Erick Joseph Rohman | — | (805) 490 8222 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Rokk Plumbing INC | Ochoa Ricardo | — | (661) 644 8116 | Other | Piru · Ventura County | — | — |
| Rolas Affordable Tree Service | Andres Negrete | — | (805) 236 0690 | Tree | Port Hueneme · Ventura County | — | — |
| Rolls Scaffold & Equipment INC | Michael Anthony Rolls | — | (805) 988 8825 | Other | Ventura · Ventura County | — | — |
| Rolls Scaffold INC | Michael Anthony Rolls | — | (805) 988 8825 | Other | Ventura · Ventura County | — | — |
| Roman Signs | Roman Signs | — | (805) 371 9470 | Other | Newbury Park · Ventura County | — | — |
| Romanson Concrete INC | Oliviera Fernando De | — | (310) 502 8996 | Other | Simi Valley · Ventura County | — | — |
| Rome Imperial Construction INC | Humberto Romero | — | (805) 840 9898 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Romma Electric INC | Juan Carlos Romero Cardenas | — | (805) 905 1579 | Electricians | Moorpark · Ventura County | — | — |
| Ron Briant Heating And Air Conditioning | Ronald Louis Briant | — | (805) 579 8014 | HVAC | Simi Valley · Ventura County | — | — |
| Ron Buccieri | Ron Buccieri | — | (818) 522 4900 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Ron Construction | Ronald Gordon Merkes | — | (805) 377 5443 | GC, remodel, ADU | Oak View · Ventura County | — | — |
| Ron Freibrun DBA Moorea Builders | Ron Freibrun DBA Moorea Builders | — | (805) 479 6751 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Ron Johnson Construction | Ronald Steven Johnson | — | (805) 559 5561 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Ron Poulson Associates INC | Jonathan Michael Ceurvorst | — | (805) 496 7400 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Ron Riazi | Ron Riazi | — | (805) 358 2130 | Electricians | Thousand Oaks · Ventura County | — | — |
| Ron's Custom Hardwood Flooring | Ron's Custom Hardwood Flooring | — | (805) 559 5888 | Other | Simi Valley · Ventura County | — | — |
| Ron's Electric | Lombardo Ron | — | (818) 426 4290 | Electricians | Newbury Park · Ventura County | — | — |
| Ron's Fence And Gate | Ron's Fence And Gate | — | (805) 218 0797 | Other | Ventura · Ventura County | — | — |
| Ronald Falat | Ronald Falat | — | (818) 266 0258 | HVAC | Simi Valley · Ventura County | — | — |
| Ronald James Padilla | Ronald James Padilla | — | (805) 814 3802 | Other | Oxnard · Ventura County | — | — |
| Roof Repair Ventura | Roof Repair Ventura | info@roofrepairventuraca.com | (805) 866-0860 | Other roofers | Ventura · Ventura County | — | — |
| Roofing By Ruiz | Rogelio Murillo Ruiz | — | (805) 205 3200 | Other roofers | Oxnard · Ventura County | — | — |
| Rooter Solutions | Fernando Galicia | — | (619) 870 6000 | Other | Ventura · Ventura County | — | — |
| Rooter Solutions | Sean Carl Collins | — | (408) 290 9553 | Other | Ventura · Ventura County | — | — |
| Roots And Branches Landscaping | Francisco Ronaldo Valencia | — | (805) 657 9508 | Windows, patio, painters | Moorpark · Ventura County | — | — |
| Roque's Plumbing | Roque's Plumbing | — | (805) 793 3786 | Other | Oxnard · Ventura County | — | — |
| Rory O'reilly Construction | Rory Thomas O'reilly | — | (805) 570 0091 | GC, remodel, ADU | Santa Paula · Ventura County | — | — |
| Rosales Bros Roofing INC | Oscar B Rosales | — | (805) 341 5876 | Other roofers | Camarillo · Ventura County | — | — |
| Rose Masonry | Rose Masonry | — | (805) 340 4010 | Other | Ventura · Ventura County | — | — |