| Robert S Dunn Construction | Robert Stephen Dunn | — | (415) 518 2964 | GC, remodel, ADU | Novato · Marin County | — | — |
| Robert Scott | Robert Scott | — | (415) 740 0185 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Robert Simkins General Contractor | Robert Simkins General Contractor | — | (415) 497 4494 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Robert Walther Painting | Robert Walther Painting | — | (415) 233 3519 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Robinson Landscaping INC | Brian Laurance Robinson | — | (415) 382 7933 | Windows, patio, painters | Novato · Marin County | — | — |
| Robinson Renovations | Jason Lane Robinson | — | (415) 636 2240 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Rock Solid Electrical | James Bradley Urquhart | — | (707) 338 5006 | Electricians | Novato · Marin County | — | — |
| Rocket Cabinet | Emmet Fall Kauffman | — | (415) 706 0639 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Rockwood Commercial Builders LLC | Russell Rocky Catelli | — | (415) 794 6003 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Rocky Hill Electric INC | Bengiamino Ernesto Ielmorini | office@rockyhillelectric.com | (415) 523 5201 | Electricians | Nicasio · Marin County | — | — |
| Rocky Montero Remodels And Repairs | Rocky Montero Remodels And Repairs | — | (415) 748 4430 | GC, remodel, ADU | Novato · Marin County | — | — |
| Rocky Soil Landscaping INC | Joseph Louis Santangelo | — | (415) 250 4104 | Windows, patio, painters | Novato · Marin County | — | — |
| Rodas Construction INC | Victor Alberto Sanchez | info@rodas-construction.com | (415) 637 3018 | GC, remodel, ADU | Novato · Marin County | — | — |
| Rodas Elite Surfaces LLC | Marcos Jr Hernandez | — | (415) 312 8724 | Other | Novato · Marin County | — | — |
| Rodas Trucking Service INC DBA Rodas Brothers Engineering | Steven William Hansen | — | (415) 497 5933 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Roderick Smith Design/build | Roderick Smith Design/build | — | (415) 847 1253 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Rodero Landscaping Design | Leyla Jahanbanoo Butero | — | (925) 575 1136 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Rodriguez Fire Protection | Rodriguez Fire Protection | — | (415) 912 7082 | Other | Novato · Marin County | — | — |
| Roger H Evje | Roger H Evje | rhevje@gmail.com | (707) 490 9591 | GC, remodel, ADU | Point Reyes Station · Marin County | — | — |
| Roger S Peacock Jr | Roger S Peacock Jr | — | (415) 275 4454 | GC, remodel, ADU | Bolinas · Marin County | — | — |
| Rolovich Electrical Construction Co. | Michael Vincent Rolovich | — | (415) 328 6746 | Electricians | Novato · Marin County | — | — |
| Romez Painting Decorating | Romez Painting Decorating | — | (415) 235 7464 | Windows, patio, painters | Novato · Marin County | — | — |
| Romo Builder | Romo Builder | — | (415) 717 3877 | GC, remodel, ADU | Novato · Marin County | — | — |
| Romo Construction | Romo Padilla Alejandro | — | (707) 704 2537 | GC, remodel, ADU | Novato · Marin County | — | — |
| Ron's Pool Service | Ronald Alan Rosson | — | (415) 897 3311 | Pool | Novato · Marin County | — | — |
| Ronald J Poppe | Ronald J Poppe | — | (415) 250 6373 | GC, remodel, ADU | San Geronimo · Marin County | — | — |
| Roots Construction Co INC | Joe Shekou | interested@domainmarket.com | (415) 453 0212 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Rortech Electric | Rory Mark Ward | — | (415) 499 7704 | Electricians | San Rafael · Marin County | — | — |
| Ros Plumbing LLC | Niall Patrick Dolan | — | (415) 505 2180 | HVAC | Novato · Marin County | — | — |
| Rosama Contractors INC | Rodrigo Alberto Carranza Martin Del Campo | — | (415) 769 6599 | GC, remodel, ADU | Novato · Marin County | — | — |
| Roseann Dal Bello Design | Roseann Dal Bello Design | — | (415) 297 4364 | Windows, patio, painters | Woodacre · Marin County | — | — |
| Rosenbach Construction INC | Frank Richardson Iii Rosenbach | info@rosenbachconstruction.com | (415) 897 8374 | GC, remodel, ADU | Novato · Marin County | — | — |
| Ross Building | Ross Building | — | (415) 717 1742 | GC, remodel, ADU | Bolinas · Marin County | — | — |
| Ross Painting | Daniel Franklin Ross | — | (415) 455 0766 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Ross Plumbing | Ross Plumbing | — | (415) 924 3646 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Ross Valley Electric | Richard Allen Carbine | — | (415) 479 3136 | Electricians | San Rafael · Marin County | — | — |
| Ross Valley Hardwood Floors | Ross Valley Hardwood Floors | — | (415) 342 5131 | Other | Fairfax · Marin County | — | — |
| Roto Rooter Plumbers | Patsy Sue Calegari | — | (415) 898 2700 | Other | Novato · Marin County | — | — |
| Royal Construction | Eugene Kenneth Royal | — | (415) 435 6244 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Royoco Construction & Development Corporation | Paris Enrique Ii Royo | — | (415) 925 8585 | GC, remodel, ADU | Ross · Marin County | — | — |