| Ring Construction INC | Terence O'donovan Ring | — | (510) 385 0027 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Rios Cabinets | Rios Cabinets | — | (925) 698 5637 | Other | Pittsburg · Contra Costa County | — | — |
| Rios Glass | Rios Glass | — | (925) 639 9414 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Rios Painting | Rios Painting | — | (925) 303 3784 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| Rise Above Stair Company | Shawn Matthew Reed | — | (925) 628 2966 | Other | Brentwood · Contra Costa County | — | — |
| Rite Rooter Plumbing | Rite Rooter Plumbing | riterooter@comcast.net | (925) 516 4525 | Other | Discovery Bay · Contra Costa County | — | — |
| Rivas Concrete INC | Benavidel G Rivas | rci@rivasconcrete.com | (415) 455 8338 | Other | Richmond · Contra Costa County | — | — |
| Rivas Electric | Hector Antonio Lopez Rivas | — | (510) 485 4942 | Electricians | El Sobrante · Contra Costa County | — | — |
| Rivas Landscape Group | Timothy Alan Rivas | — | (925) 586 8992 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Rivas Painting | Rivas Painting | — | (925) 768 3649 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Rivendell Woodworks INC | Alahan Kanda | — | (925) 676 9663 | Other | Concord · Contra Costa County | — | — |
| Rivera Home Service | Hernandez Polo Rivera | — | (925) 705 5069 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Rivera Landscape Construction | Rivera Daniel | — | (925) 691 1024 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Rivera Stoneworks INC | Rafael Rivera Fajardo | — | (925) 212 3252 | Other | Concord · Contra Costa County | — | — |
| Rivera's Garden Landscaping INC | Jose Luis Rivera Huerta | — | (925) 383 2071 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| Rivers Plumbing Heating And Air | Steven Anthony Rivers | — | (925) 846 6000 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Riviera Pools | Heather Tippin | info@poolsbyriviera.com | (925) 736 3800 | Pool | Danville · Contra Costa County | — | — |
| Rj Canclini Construction INC | Robert James Canclini | — | (925) 849 2009 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Rj Landscape LLC | Juan Enrique Mendieta Jimenez | — | (925) 391 6516 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Rja Plumbing | Olga Judith Garibay Sanchez | info@rjaplumbing.com | (510) 925 4593 | Other | Antioch · Contra Costa County | — | — |
| Rjc Construction | Ricardo Josafat Colin Castillo | — | (415) 603 0679 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Rke Construction Corp | Ernesto Benito Jr Pineda | — | (408) 550 4169 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Rkh Constructors INC | Richard Kenneth Jr Humphries | — | (925) 765 6464 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Rl Contracting | Richard Brian Lopez | — | (707) 628 2188 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Rl Landscape | Rl Landscape | — | (925) 727 7691 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Rlt Construction INC | James Richard Pawloski | — | (925) 584 9884 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Rm Construction INC | Ruben Montiel | — | (925) 698 4759 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Rm General Construction | Richard Edward Botsford | — | (925) 207 3407 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Rm Medical INC | Reginald Thomas Pearson | — | (925) 363 3400 | Other | Concord · Contra Costa County | — | — |
| Rm Painting | Rm Painting | — | (510) 672 8321 | Windows, patio, painters | Oakley · Contra Costa County | — | — |
| Rm22 Demolition | Lucas Sky Walker Vieira | — | (510) 372 4662 | Other | Pinole · Contra Costa County | — | — |
| Rmc Home Improvements | Rmc Home Improvements | — | (925) 209 0952 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Rmg Underground Construction INC | Roberto Melena | — | (925) 565 1834 | Other | Oakley · Contra Costa County | — | — |
| Rms Painting INC | Munoz-segovia Rafael | — | (925) 584 6269 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Rmz Engineering | Miguel Ramirez | — | (510) 932 8392 | Other | San Pablo · Contra Costa County | — | — |
| Rnc Door Solutions LLC | Richard Joseph Rapacon | — | (925) 408 7486 | Other | Martinez · Contra Costa County | — | — |
| Rng Construction & Design INC | Rangel Oscar Ramirez | — | (415) 532 7680 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Rnr Drywall INC | Pedro Orozco Ortiz | — | (415) 720 5333 | Other | San Pablo · Contra Costa County | — | — |
| Rob Bowlen Home Inspection INC DBA Rob Bowlen Construction | Norman Robert Bowlen | — | (925) 383 6001 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Robbert Construction Engineering | Roy Harland Robbert | — | (925) 765 3032 | Electricians | Discovery Bay · Contra Costa County | — | — |