| Rays Tub Refinish | Heinar Alexis Pech-Ku | — | (805) 807 7686 | Other | Moorpark · Ventura County | — | — |
| Razi Design & Build | Karapet Halajian | — | (818) 800 1666 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Rb Construction | Retana Batrez Isidro | — | (805) 844 3955 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Rb Landscaping | Rb Landscaping | — | (805) 827 5457 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Rb Mega Hardscape INC | Rony Alexander Blanco Garcia | — | (805) 209 9656 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Rb Tree Service | Beltran Arellano Rogelio | — | (805) 272 5509 | Tree | Ojai · Ventura County | — | — |
| Rbw Plumbing | Leah Rae Knoll | — | (760) 272 7090 | Other | Simi Valley · Ventura County | — | — |
| Rc Construction | Cara Marie Hollenbeck | — | (805) 300 9109 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Rc Debris Hauling | Rc Debris Hauling | — | (805) 328 1068 | Other | Simi Valley · Ventura County | — | — |
| Rc Landscape Services | Adrian Johnatann Cardona | info@rclandscapeservices.com | (805) 236 6922 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Rc Repair And Maintenance LLC | Flores Rodolfo Cerna | — | (805) 901 7100 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Rci Builders INC | Therese Louise Rice | — | (818) 865 0200 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Rdaj Construction | Ryan Major Port | — | (310) 709 6772 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Re-viv West Painting | Re-viv West Painting | — | (805) 312 2193 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Re/max Gold Coast Property Management 2-106 | Re/max Gold Coast Property Management 2-106 | — | (805) 832-4075 | Property managers | Oxnard · Ventura County | — | — |
| Ready Restoration INC | Brian Dixon Sweetland | — | (805) 984 3344 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Real Fence | Real Fence | — | (805) 428 9676 | Other | Moorpark · Ventura County | — | — |
| Real Mechanical Solutions LLC | Leo Anthony Jr Realivasquez | — | (805) 558 9648 | HVAC | Newbury Park · Ventura County | — | — |
| Real Model Solutions INC | Riffat Maqbool Qadir | — | (949) 279 7747 | Other | Ventura · Ventura County | — | — |
| Real Natives Landscape Design Corporation | Bryan Anthony Richards | — | (310) 694 7636 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Real Property Management Core | Real Property Management Core | — | (805) 507-5065 | Property managers | Ventura · Ventura County | — | — |
| Real Tite Waterproofing Coatings | Real Tite Waterproofing Coatings | — | (805) 630 5966 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Rebar Supply INC | Rex Lee Lanning | — | (805) 649 4526 | GC, remodel, ADU | Oak View · Ventura County | — | — |
| Reborn Tile And Stone | Reborn Tile And Stone | — | (818) 836 2250 | Other | Simi Valley · Ventura County | — | — |
| Rec Electric INC | Robert Elmo Chaney | — | (805) 797 2717 | Electricians | Ventura · Ventura County | — | — |
| Recycled Base Materials INC | Michael Lea Mattivi | — | (818) 362 9400 | Other | Westlake Village · Ventura County | — | — |
| Red - Tail Ground Water Solutions INC | Pedro Burciaga Munoz | — | (805) 797 0320 | Other | Santa Paula · Ventura County | — | — |
| Red Canyon Tile & Stone | Red Canyon Tile & Stone | — | (805) 908 1195 | Other | Ojai · Ventura County | — | — |
| Red Cat Painting | Red Cat Painting | — | (805) 338 8052 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Red Jacket Shaft Construction | Brandon David Arend | — | (805) 849 9773 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Red Line Builders | Red Line Builders | info@redlinebuilders.com | (208) 849-2800 | GC, remodel, ADU | Somis · Ventura County | — | — |
| Red Lion Construction Company | Rogelio Jesus Salazar | — | (805) 512 4277 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Red White & Blue Builders LLC DBA Red White & Blue Framers | Skyler Mark Strom | — | (805) 766 0400 | Other | Camarillo · Ventura County | — | — |
| Reda Labib Construction | Reda Labib Rezk Soliman | — | (818) 590 3939 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Redemptive Sales DBA Window & Door Solutions | Window & Door Solutions | — | (818) 521 9833 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Reder Construction INC | Andrew James Reder | — | (805) 498 1999 | Electricians | Westlake Village · Ventura County | — | — |
| Redit Construction | Wayne Nigel Redit | — | (805) 815 6596 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Redm Tile & Slab | Dmitrii Ivanov | — | (805) 870 9910 | Other | Westlake Village · Ventura County | — | — |
| Redman Custom Garage Doors | Redman Custom Garage Doors | — | (805) 484 0458 | Other | Camarillo · Ventura County | — | — |
| Redwood Constructors INC | Gabriel Allen Dilworth | — | (310) 753 3555 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |