| Ron Grove Construction | Ronald Arthur Grove | — | (805) 674 1827 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Ron Jordan Concrete Pumping INC | Ronald Eston Jordan | — | (805) 772 1781 | Other | Paso Robles · San Luis Obispo County | — | — |
| Ron Reis Construction | Ronald Allen Reis | — | (805) 440 0970 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Ron Shoffeitt Masonry | Ron Shoffeitt Masonry | — | (805) 888 9972 | Other | Shell Beach · San Luis Obispo County | — | — |
| Ronald H Murrell | Ronald H Murrell | — | (805) 835 6911 | Windows, patio, painters | Cambria · San Luis Obispo County | — | — |
| Ronco Air INC | Michelle Rae Boyd | roncoair@hotmail.com | (805) 474 9537 | HVAC | Grover Beach · San Luis Obispo County | — | — |
| Rorrer And Olson Flooring | Patricia Dannie Rorrer | — | (805) 481 1425 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Rosas Painting Company LLC | Teodoro Jr Rosas | justin@rosaspainting.com | (805) 904 8085 | Windows, patio, painters | Grover Beach · San Luis Obispo County | — | — |
| Ross Construction | Ross William De Chambeau | — | (805) 801 0174 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Ross System Services | Lawrence Charles Ross | — | (805) 458 9544 | Electricians | Los Osos · San Luis Obispo County | — | — |
| Rossi & Carr Electrical INC | Russell Harold Sterner | — | (805) 238 3502 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Rountree & Associates | Nicholas Marr Rountree | — | (805) 238 4594 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Rovall Welding & Fabrication | Ryan Mitchell Rovenstine | — | (805) 296 0519 | Other | Paso Robles · San Luis Obispo County | — | — |
| Rowles Construction | Charles Joseph Rowles | — | (805) 215 5758 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Rowley Engineering | Rowley Engineering | — | (805) 714 2580 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Royal Gate & Fence INC | Salvador Valencia Gonzalez | — | (805) 720 4065 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Royal Stone Masonry | Royal Stone Masonry | offers@johns.domains | (805) 270 8081 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Royale Tile Company | Ryan Randolph Miles | — | (805) 712 1184 | Other | Atascadero · San Luis Obispo County | — | — |
| Royalty Construction | Timothy Michael Moscardi | interested@domainmarket.com | (805) 698 2765 | Electricians | Atascadero · San Luis Obispo County | — | — |
| Royce Construction | Royce Dean Eddings | — | (805) 423 5850 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Rs Landscape Maintenance | Rs Landscape Maintenance | — | (805) 550 6740 | Windows, patio, painters | Oceano · San Luis Obispo County | — | — |
| Rs Painting | Rs Painting | — | (805) 801 9776 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Rspaul Company INC | Richard Herman Jr Paul | — | (805) 544 2400 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Ruben Blanco Glass Services | Ruben Anthony Blanco | — | (805) 712 2565 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| Rudy B Stowell Construction | Rudy Benton Stowell | — | (805) 709 1339 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Ruffoni Appliance Repair | Daniel Bernell Ruffoni | — | (805) 451 5000 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Ruggles Construction | Spencer James Ruggles | — | (805) 591 0394 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Ruiz 805 Builder | Ruiz 805 Builder | — | (805) 835 3292 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Ruiz Painting Repair A Partnership | Steven Robert Digrazia | — | (805) 674 8256 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| Russell Family Plastering Ventures INC | Christopher Curtis Russell | — | (805) 931 0898 | Other | Nipomo · San Luis Obispo County | — | — |
| Russell Scholl Construction | Russell David Scholl | — | (805) 674 1288 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Rutledge INC | Daniel King Rutledge | — | (805) 543 6819 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Ryan Heschke Finish Carpentry | Ryan Heschke Finish Carpentry | — | (805) 975 5249 | Other | Templeton · San Luis Obispo County | — | — |
| Ryno Building Company | Ryan Wesley Pope | — | (805) 610 0304 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| S & M Fire Protection | Matthew Bryant Andahl | — | (805) 541 4566 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| S & S Homes | Warren Lee Sanders | — | (805) 994 1822 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| S C Dunn Drywall INC | Heath Steven Dunn | — | (805) 237 1606 | Other | Paso Robles · San Luis Obispo County | — | — |
| S C S Communications | S C S Communications | sales@scscommunications.com | (805) 543 7799 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| S Carlson's Plumbing INC | Steven Richard Carlson | impallari@gmail.com | (805) 591 0978 | Other | Atascadero · San Luis Obispo County | — | — |
| S Chaves Construction INC | Steven Manuel Chaves | — | (805) 543 9340 | Other | Arroyo Grande · San Luis Obispo County | — | — |