| Rodrigues Construction | Joseph Mathew Rodrigues | contact@rodriguesconstruction.com | (707) 208 2342 | Electricians | Fairfield · Solano County | — | — |
| Rodriguez Construction | Rodriguez Avelino Hugo | — | (707) 803 9710 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rogar Plumbing INC | Rogelio Cardenas Garcia | kgarrett@rogarplumbing.com | (707) 761 0097 | Other | Fairfield · Solano County | — | — |
| Roger Incorporated Painting | Claudio Roberto De Leon Ortiz | — | (415) 464 7921 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rojas Plumbing Company | Ivan J Rojas Ramirez | — | (510) 932 3184 | Other | Vallejo · Solano County | — | — |
| Rom's Painting | Rom's Painting | — | (510) 604 5035 | Windows, patio, painters | Benicia · Solano County | — | — |
| Romak Iron Works | Steve Earle Romak | — | (707) 751 2420 | Other | Benicia · Solano County | — | — |
| Ron Hogan Drywall | Ron Hogan Drywall | — | (925) 791 9099 | Other | Fairfield · Solano County | — | — |
| Ron Phillips Painting | Ron Phillips Painting | — | (707) 374 5954 | Windows, patio, painters | Rio Vista · Solano County | — | — |
| Ron Roe | Ron Roe | — | (707) 365 9404 | Other | Vacaville · Solano County | — | — |
| Ron Steven Fucchi General Contractor | Ron Steven Fucchi General Contractor | — | (707) 479 3934 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Roof Proofing | Roof Proofing | — | (707) 641 9628 | Other roofers | Vallejo · Solano County | — | — |
| Roof Solutions INC | Raymond Eugene Ragsdale | — | (707) 449 7663 | Other roofers | Vacaville · Solano County | — | — |
| Roofing Craftsmen | Jose David Escalante | jose@roofingcraftsmen.com | (415) 342 5544 | Other roofers | Fairfield · Solano County | — | — |
| Roofing Craftsmen & Solar | Solar Sales And Services Tsp | — | (415) 342 5544 | Other roofers | Fairfield · Solano County | — | — |
| Roofmasters | Aaron Douglas Weiss | roofmasters@att.net | (707) 447 7663 | Other roofers | Suisun City · Solano County | — | — |
| Rooftop Roofing INC | Perez Salvador Rios | estimates@rooftoproofing.com | (707) 334 1503 | Other roofers | Vallejo · Solano County | — | — |
| Rooter Cowboy Plumbing | Rooter Cowboy Plumbing | — | (707) 720 9750 | Other | Vallejo · Solano County | — | — |
| Roroman Plumbing INC | Jose Ascencion Rodriguez | — | (707) 863 1621 | Other | Vacaville · Solano County | — | — |
| Roschen Construction Consulting | Ethan Blair Roschen | — | (707) 592 8366 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Rowlands Construction | Aaron Ray Rowlands | — | (707) 365 3979 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Royal Home Builder | Royal Home Builder | — | (707) 580 1800 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Rozco Construction Co | Edgardo Gerardo Orozco | — | (510) 837 0777 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rp Construction | Rivera Peralta Alonso | — | (707) 732 1511 | GC, remodel, ADU | Suisun City · Solano County | — | — |
| Rsvn Lath & Plaster | Rsvn Lath & Plaster | rsvn1lathplaster@gmail.com | (707) 365 5394 | Other | Vacaville · Solano County | — | — |
| Ruben D Lopez | Ruben D Lopez | — | (707) 592 1109 | Other | Vacaville · Solano County | — | — |
| Ruben Enriquez Venegas - Enriquez's Masonry | Ruben Enriquez Venegas | — | (707) 249 4972 | Other | Vacaville · Solano County | — | — |
| Rubio Construction | Erwin Timothy Rubio | frubio@rubioconstruction.com | (510) 825 5773 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Rudy's Green Service | Rodolfo Gutierrez | — | (707) 853 1777 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Rui Xiong Ye | Rui Xiong Ye | — | (415) 238 0206 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Ruiz Construction | Ruiz Francisco | ruiz@ruiz-construction.com | (707) 344 5543 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Russell's Custom Electric | Richard James Russell | rich@russellscustomelectric.com | (707) 693 5109 | Electricians | Vallejo · Solano County | — | — |
| Ryan James Crawford DBA Finishing Touch Home - Commercial Service | Ryan James Crawford | — | (707) 694 3089 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Ryan Morgan | Ryan Morgan | — | (707) 718 0053 | Other | Vacaville · Solano County | — | — |
| Rzn Electric | Rickey Devel Jr Dial | — | (707) 273 7131 | Electricians | Vallejo · Solano County | — | — |
| S & P Mechanical | S & P Mechanical | — | (707) 334 0201 | HVAC | Vallejo · Solano County | — | — |
| S & W Paving INC | Pamela Christine Spering | — | (707) 429 1900 | GC, remodel, ADU | Suisun City · Solano County | — | — |
| S A S Paving INC | Randy Steve Stanley | — | (707) 628 0476 | Other | Vacaville · Solano County | — | — |
| S A Schmidt Construction | Scott Andrew Schmidt | — | (530) 219 4016 | GC, remodel, ADU | Dixon · Solano County | — | — |
| S Agustin Construction | Saul Eduardo Agustin | — | (510) 253 7305 | GC, remodel, ADU | Vallejo · Solano County | — | — |