| Robert A Marzo | Robert A Marzo | — | (925) 234 2702 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Robert Brosamer | Robert Brosamer | — | (925) 932 7900 | Other | Walnut Creek · Contra Costa County | — | — |
| Robert Burtt | Robert Burtt | — | (925) 528 8081 | Electricians | Orinda · Contra Costa County | — | — |
| Robert Cushing | Robert Cushing | — | (925) 785 5109 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| Robert Fry Horticultural Services | Robert Jacob Fry | — | (510) 219 7315 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Robert Gardner Company | Robert Edward Gardner | — | (925) 933 6929 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Robert Gray Construction | Robert Sidney Gray | — | (510) 798 3712 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Robert J Chorak Ii | Robert J Chorak Ii | — | (510) 812 8911 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Robert J Freitas | Robert J Freitas | — | (925) 634 9500 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Robert J Porter Const | Robert J Porter Const | — | (209) 986 1622 | GC, remodel, ADU | Byron · Contra Costa County | — | — |
| Robert J Williamson | Robert J Williamson | — | (510) 813 1318 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Robert John Ferreira | Robert John Ferreira | — | (925) 683 6623 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Robert L Brown Construction INC | Eric Mitchell Eisen | — | (925) 228 4944 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Robert L Dias DBA Rd's Service Contractor | Robert Leonard Dias | — | (925) 680 1161 | HVAC | Concord · Contra Costa County | — | — |
| Robert L Turner Construction | Robert Lucius Turner | — | (925) 594 0955 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Robert Mills | Robert Mills | — | (925) 872 4444 | Electricians | Clayton · Contra Costa County | — | — |
| Robert Mills Construction | Robert David Mills | — | (925) 872 4444 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Robert P Scott Construction | Robert Philip Scott | — | (925) 658 2281 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Robert Salazar Construction | Robert Joseph Salazar | — | (925) 383 5208 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Robert Weltz Electric | Robert Lee Weltz | — | (925) 383 5390 | Electricians | Pleasant Hill · Contra Costa County | — | — |
| Robert Williamson General Contractor | Robert Williamson General Contractor | — | (925) 818 0233 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Robert Zaste Sr | Robert Zaste Sr | — | (925) 826 6684 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Robert's Cabinet And Wood Restoration | Robert's Cabinet And Wood Restoration | — | (925) 978 9859 | Restoration | Antioch · Contra Costa County | — | — |
| Robert's Landscaping | Robert's Landscaping | — | (925) 300 8014 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Robert's Lawn And Garden Care Service | Robert Salazar Avila | — | (925) 381 5842 | Windows, patio, painters | Pacheco · Contra Costa County | — | — |
| Robin Scott Caulfield | Robin Scott Caulfield | — | (702) 308 1250 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Roble Builders | Mario Barajas-Ochoa | — | (415) 350 4646 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Robs Landscaping | Robs Landscaping | — | (925) 783 1087 | Windows, patio, painters | El Sobrante · Contra Costa County | — | — |
| Roc Drywall INC | Reid Allen Ochs | — | (925) 258 0434 | Other | Orinda · Contra Costa County | — | — |
| Roca Fuerte Landscaping | Roca Fuerte Landscaping | — | (510) 677 3483 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Rock & Smooth Drywall | Rock & Smooth Drywall | — | (801) 641 9642 | Other | Bay Point · Contra Costa County | — | — |
| Rock Solid Development | Elvira Sandulyak | — | (925) 548 7453 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Rockford Plumbing LLC | Jose Brian Jimenez Calzadilla | — | (510) 942 5242 | Other | Antioch · Contra Costa County | — | — |
| Rockstars | Dustin Steven Lakin | — | (925) 382 0814 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Rockstone Tile INC | Roxana Beatriz Calero | — | (415) 577 2724 | Other | San Pablo · Contra Costa County | — | — |
| Rod Burkholder Construction | Rodney George Burkholder | — | (925) 323 5201 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Rod Stucco & Plastering | Rod Stucco & Plastering | — | (925) 698 4843 | Other | Pittsburg · Contra Costa County | — | — |
| Rodd Olson Painting | Rodd Olson Painting | — | (925) 705 1499 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Rodda Electric INC | Raymond Thomas Rodda | — | (925) 240 6024 | Electricians | Brentwood · Contra Costa County | — | — |
| Rodde Construction INC | Jonathan Williams Rodde | — | (925) 588 8511 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |