| Ronald Construction | Greg Steven Ronald | — | (530) 378 1604 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Ronald H Stickney | Ronald H Stickney | — | (530) 515 1958 | Electricians | Redding · Shasta County | — | — |
| Ronald Munoz Jr | Ronald Munoz Jr | — | (530) 776 8941 | Other | Redding · Shasta County | — | — |
| Roof Redding INC | Cole Alan Wagner | — | (530) 515 6788 | Other roofers | Palo Cedro · Shasta County | — | — |
| Rooter Scooter | Rooter Scooter | — | (530) 244 7357 | Other | Redding · Shasta County | — | — |
| Rossie Electrical Controls And Consulting | John Richard Rossie | — | (530) 339 2842 | Electricians | Cottonwood · Shasta County | — | — |
| Rother Construction LLC | Paul Andrew Rother | — | (530) 224 1572 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Roto-rooter Shasta County | Roto-rooter Shasta County | — | (530) 221 7686 | Other | Redding · Shasta County | — | — |
| Round Rock Construction INC | Adam Christopher Whelen | — | (530) 945 8914 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Roy Reid Construction INC DBA Roybuilt | Leroy John Reid | — | (650) 454 4605 | GC, remodel, ADU | Shingletown · Shasta County | — | — |
| Royal Crown Construction | Guy Stacy Stansberry | — | (530) 356 7324 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Royal Plumbing | Royal Plumbing | — | (530) 356 8512 | Other | Redding · Shasta County | — | — |
| Rph & H Enterprises INC | Russell Raymond Savard | — | (530) 223 6833 | HVAC | Redding · Shasta County | — | — |
| Rqc INC | Kelly J Rhodes | — | (530) 348 2073 | Other | Cottonwood · Shasta County | — | — |
| Rsc | Robert Laurence Salyer | — | (530) 604 3500 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Rta Construction INC | Allen Eugene Toney | — | (530) 223 1100 | Electricians | Redding · Shasta County | — | — |
| Rubio Painting | Jesus Aaron Rubio | — | (530) 221 1419 | Windows, patio, painters | Redding · Shasta County | — | — |
| Rush Relief Reconstruction | Rush Relief Reconstruction | — | (530) 560 5832 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Rush Relief Restoration Services | Daniel Douglas Lockwood | — | (530) 720 1120 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Russ Chancellor General Building Contractor | Russ Chancellor General Building Contractor | — | (530) 515 6747 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Russ Turley Refrigeration | Russ Turley Refrigeration | — | (530) 688 2012 | HVAC | Lakehead · Shasta County | — | — |
| Russell Construction | Eddie Joe Russell | — | (530) 921 0700 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Russell Roberts Backflow | Russell Roberts Backflow | — | (530) 209 1542 | Other | Redding · Shasta County | — | — |
| Russo Construction Company | John Rocco Russo | — | (530) 347 6750 | GC, remodel, ADU | Cottonwood · Shasta County | — | — |
| Rutherford General Contractor | Rutherford General Contractor | — | (510) 847 7105 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Ryan Devarso | Ryan Devarso | — | (530) 768 3010 | Windows, patio, painters | Redding · Shasta County | — | — |
| Ryan Houchins Construction | Ryan Eugene Houchins | — | (530) 366 1644 | GC, remodel, ADU | Cottonwood · Shasta County | — | — |
| Ryan James Electric INC | Ryan Tyler James | — | (530) 355 9363 | Electricians | Redding · Shasta County | — | — |
| Ryan Shaw Construction | Ryan Thomas Shaw | — | (530) 221 1733 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Ryan Vollmer Construction LLC | Ryan Lee Vollmer | — | (503) 753 4876 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Ryjen Construction | Ryan Mitchell Lehman | — | (530) 764 7399 | GC, remodel, ADU | Shasta Lake · Shasta County | — | — |
| S & H Dunbar Enterprises INC | Robert Shane Lurtsema | — | (530) 351 5153 | Windows, patio, painters | Cottonwood · Shasta County | — | — |
| S & J Development INC | Sue Ying Tsai | — | (530) 222 8585 | GC, remodel, ADU | Redding · Shasta County | — | — |
| S & K Paving Sealing & Striping INC DBA Parking Improvement | Kevin Charles Schafer | — | (530) 549 3823 | Other | Bella Vista · Shasta County | — | — |
| S & L Concrete Construction | Shannon Eugene Loker | — | (530) 275 9105 | Other | Redding · Shasta County | — | — |
| S E B Engineering INC DBA Stewart Engineering INC | Keith Douglas Stewart | — | (530) 244 8464 | GC, remodel, ADU | Redding · Shasta County | — | — |
| S I R S | S I R S | — | (530) 355 7768 | GC, remodel, ADU | Redding · Shasta County | — | — |
| S K Construction | Brian Paul Kamisky | — | (530) 378 5317 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| S M G P Construction | Spencer Michael Gray Park | — | (530) 605 6927 | GC, remodel, ADU | Redding · Shasta County | — | — |
| S P Construction | Steven Brien Puckett | — | (530) 949 8650 | GC, remodel, ADU | Shasta Lake · Shasta County | — | — |