| Rocky Mountain Drywall INC | Patrick Oswin Mackie | — | (916) 660 3404 | Other | Roseville · Placer County | — | — |
| Rocky Road Construction | Steven Robert Fenton | — | (916) 543 6543 | HVAC | Newcastle · Placer County | — | — |
| Rocon Development | Rocon Development | — | (916) 276 7429 | GC, remodel, ADU | Loomis · Placer County | — | — |
| Rodell D Boston | Rodell D Boston | — | (916) 538 4818 | Electricians | Lincoln · Placer County | — | — |
| Rodney West Painting | Rodney West Painting | — | (916) 289 8408 | Windows, patio, painters | Colfax · Placer County | — | — |
| Roger Allen Bahrke | Roger Allen Bahrke | — | (530) 525 1010 | GC, remodel, ADU | Homewood · Placer County | — | — |
| Roger And Sons Painting | Roger And Sons Painting | rogersonspainting@gmail.com | (530) 320 6735 | Windows, patio, painters | Foresthill · Placer County | — | — |
| Roger Cornwell | Roger Cornwell | — | (916) 624 1481 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| Rogers Landscape | Andrew Nickolas Rogers | — | (916) 844 8828 | Windows, patio, painters | Loomis · Placer County | — | — |
| Rogers Plumbing | Rogers Plumbing | — | (530) 269 9548 | Other | Auburn · Placer County | — | — |
| Rohr Mechanical | Rohr Mechanical | — | (916) 699 0374 | HVAC | Lincoln · Placer County | — | — |
| Rollin Electric | Rollin Travis Brown | — | (916) 257 0974 | Electricians | Loomis · Placer County | — | — |
| Rolling Along Painting | Rolling Along Painting | ron@rollingalongpainting.com | (919) 473-6993 | Windows, patio, painters | Foresthill · Placer County | — | — |
| Rolling Garage Doors & Gates INC | William Shane Dalton | — | (530) 320 8879 | Other | Alta · Placer County | — | — |
| Roman Electric Services INC | Roman Vasilyevich Bogach | — | (916) 206 8173 | Electricians | Loomis · Placer County | — | — |
| Romana INC | Ursulescu Claudiu | — | (916) 825 0094 | GC, remodel, ADU | Granite Bay · Placer County | — | — |
| Romana Modular INC | Claudiu Ursulescu | — | (916) 825 0094 | GC, remodel, ADU | Granite Bay · Placer County | — | — |
| Romano HVAC Incorporated | Juliano Romano Galanti | — | (916) 274 9021 | HVAC | Roseville · Placer County | — | — |
| Romero Landscaping | Romero Landscaping | — | (530) 906 1495 | Windows, patio, painters | Auburn · Placer County | — | — |
| Romik Builds | Roman Kislyanka | — | (916) 955 8153 | GC, remodel, ADU | Auburn · Placer County | — | — |
| Romo Construction | Thomas Frank Romo | — | (916) 206 3474 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Ron Burns Construction | Ronald Raymond Burns | — | (530) 320 6808 | GC, remodel, ADU | Meadow Vista · Placer County | — | — |
| Ron Stivers Construction | Ronald Michael Stivers | — | (916) 837 5986 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| Ronald D Bettencourt | Ronald D Bettencourt | — | (530) 745 9990 | GC, remodel, ADU | Auburn · Placer County | — | — |
| Ronald T Curtis Plumbing | Ronald T Curtis Plumbing | — | (916) 759 6680 | Other | Lincoln · Placer County | — | — |
| Roof Recovery INC | Aurel Rosiu | — | (916) 678 9786 | Other roofers | Rocklin · Placer County | — | — |
| Roof Rx | Roof Rx | — | (714) 581-9576 | Other roofers | Auburn · Placer County | — | — |
| Rory Bain Glass | Rory Bain Glass | — | (510) 583 7350 | Windows, patio, painters | Loomis · Placer County | — | — |
| Rose Electric | David Lee Rose | — | (530) 268 2728 | Electricians | Auburn · Placer County | — | — |
| Rose Roofing | Janet Lynn Rose | — | (530) 823 3812 | Other roofers | Newcastle · Placer County | — | — |
| Rose Roofing & Supply INC | Janet Lynn Rose | — | (530) 823 3812 | Tile distributors | Newcastle · Placer County | — | — |
| Rosene Classics | Rosene Classics | roseneclassics80@gmail.com | (530) 308 2740 | GC, remodel, ADU | Auburn · Placer County | — | — |
| Rosene Electric | David John Rosene | — | (530) 906 1047 | Electricians | Auburn · Placer County | — | — |
| Roseville Carpet One | Kelly Eugene Mann | — | (916) 782 1188 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Roseville Electric Utility | Roseville Electric Utility | webpageupdate_subscribers@revize.com | — | EV chargers | Roseville · Placer County | — | — |
| Roseville Equipment Service | Joseph Marshall Silvia | — | (916) 616 7319 | Electricians | Roseville · Placer County | — | — |
| Roseville Fence Company INC | Robert Roy La Joie | — | (916) 727 6236 | Other | Roseville · Placer County | — | — |
| Roseville Floors & More LLC | Enis Dzapo | — | (916) 617 6035 | Other | Roseville · Placer County | — | — |
| Roseville Glass INC | Daniel Patrick Campbell | — | (916) 783 4116 | Windows, patio, painters | Roseville · Placer County | — | — |
| Roseville Kitchen & Bath | Roseville Kitchen & Bath | — | (916) 865 6808 | GC, remodel, ADU | Roseville · Placer County | — | — |