| Randy Dutton Construction | Randell Carvel Dutton | — | (209) 256 4535 | Other | Jackson · Amador County | — | — |
| Randy Ilich | Randy Ilich | — | (209) 245 3295 | GC, remodel, ADU | Ione · Amador County | — | — |
| Rasmussen Construction | Peter Emil Rasmussen | — | (209) 614 9339 | GC, remodel, ADU | Ione · Amador County | — | — |
| Real Environmental Products LLC | Rodney Cameron Peoples | — | (209) 296 7900 | Other | Jackson · Amador County | — | — |
| Reilly Protective Coatings | Reilly Protective Coatings | — | (209) 217 6082 | Other | Ione · Amador County | — | — |
| Reuter Brothers Construction INC | Nathaniel Josiah Reuter | — | (209) 304 3390 | GC, remodel, ADU | Plymouth · Amador County | — | — |
| Rich Wright Construction | Richard Jeffery Wright | admin@richwrightconstruction.com | (209) 304 9139 | GC, remodel, ADU | Ione · Amador County | — | — |
| Rich's Carpets | Rich's Carpets | — | (209) 304 9739 | Other | Ione · Amador County | — | — |
| Richard Keels Construction | Richard Lee Keels | — | (831) 246 0007 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Right Angle Renovation | Right Angle Renovation | — | (209) 283 3326 | GC, remodel, ADU | Sutter Creek · Amador County | — | — |
| Rio Vista Electric | Gary Gene Schlager | — | (209) 482 2159 | Electricians | Jackson · Amador County | — | — |
| Ritson Roofing | David John Ritson | — | (209) 304 2040 | Other roofers | Pioneer · Amador County | — | — |
| Rlk Construction | Robert Paul Stevens | — | (209) 217 7635 | GC, remodel, ADU | Ione · Amador County | — | — |
| Rlk INC | Robert Paul Stevens | — | (209) 296 5666 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Roa's Plumbing | Aun Anna Roa | — | (209) 479 9587 | Other | Ione · Amador County | — | — |
| Rob Cowan Construction INC | Robert Thomas Cowan | — | (209) 245 4509 | Other | Plymouth · Amador County | — | — |
| Robert Perez | Robert Perez | — | (209) 327 5822 | GC, remodel, ADU | Ione · Amador County | — | — |
| Robinson Masonry | Robinson Masonry | — | (916) 666 8944 | Other | Sutter Creek · Amador County | — | — |
| Rocking G Builders | Rocking G Builders | — | (209) 304 9449 | GC, remodel, ADU | Amador City · Amador County | — | — |
| Rocky's Landscaping | Rocky's Landscaping | — | (209) 304 4097 | Windows, patio, painters | Ione · Amador County | — | — |
| Rodman Construction | Michael David Rodman | — | (209) 419 0670 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Romayor Renovations | Romayor Renovations | — | (209) 296 7419 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| Roof Roofing INC | Henry Wade Olocki | — | (408) 655 5843 | Other roofers | Sutter Creek · Amador County | — | — |
| Rrt Seamless Gutters | Rrt Seamless Gutters | rrtseamlessgutters@gmail.com | (209) 781 6001 | Other | Volcano · Amador County | — | — |
| Rubini Tree Service INC | Nicholas Joseph Rubini | — | (209) 223 2056 | Tree | Volcano · Amador County | — | — |
| Russ Wenke Construction INC | Russ Wenke | — | (408) 206 3928 | GC, remodel, ADU | Pioneer · Amador County | — | — |
| S C Construction | Stephen Allyn Christman | — | (916) 337 6728 | GC, remodel, ADU | Ione · Amador County | — | — |
| S C Electric | Richard Bryan Murphy | — | (209) 256 2545 | Electricians | Sutter Creek · Amador County | — | — |
| S D K Electric | Dana Scott Krulee | — | (408) 691 7922 | Electricians | Sutter Creek · Amador County | — | — |
| S R Builder | S R Builder | — | (415) 488 3943 | GC, remodel, ADU | Ione · Amador County | — | — |
| S R Howe Construction | Scott Randall Howe | — | (805) 722 4205 | GC, remodel, ADU | Pine Grove · Amador County | — | — |
| S T H Finish Carpentry | S T H Finish Carpentry | — | (916) 837 9793 | Other | Pine Grove · Amador County | — | — |
| Santinelli David & Associates Well Drilling | Fredric Eugene Waters | — | (209) 768 0327 | Other | Amador City · Amador County | — | — |
| Schafer Construction | Charles Harold Schafer | — | (209) 304 3645 | GC, remodel, ADU | Sutter Creek · Amador County | — | — |
| Scott Thompson Construction | Scott Douglas Thompson | — | (209) 256 9694 | GC, remodel, ADU | Volcano · Amador County | — | — |
| Scottys Painting | Scottys Painting | — | (209) 256 5062 | Windows, patio, painters | Jackson · Amador County | — | — |
| Sean St Clair Construction | Sean Thomas St Clair | — | (707) 689 2848 | GC, remodel, ADU | Fiddletown · Amador County | — | — |
| Serge's Plumbing | Sergei Chaika | — | (209) 304 2157 | Other | Ione · Amador County | — | — |
| Servpro Of Amador / Calaveras Counties | Servpro Of Amador / Calaveras Counties | — | (209) 912-9205 | HVAC | Amador · Amador County | — | — |
| Shane Evans | Shane Evans | — | (530) 919 5595 | GC, remodel, ADU | Pioneer · Amador County | — | — |