| Rodriguez Construction | Adan Jr Rodriguez | — | (510) 731 4442 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Rodriguez Construction | Luis Antonio Rodriguez | — | (510) 388 6736 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Rodriguez Electric INC | Jorge Rene Rodriguez | — | (415) 828 4551 | Electricians | Hayward · Alameda County | — | — |
| Rodriguez Excel Painting INC | Oscar Omar Rodriguez | — | (510) 828 6968 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Rodriguez Hardwood Floors INC | Rodriguez Alvaro | — | (510) 727 0734 | Other | Castro Valley · Alameda County | — | — |
| Rodriguezelectric510 LLC | Carlos Alberto Rodriguez Rodas | — | (510) 682 1225 | Electricians | Oakland · Alameda County | — | — |
| Rodz Painting | Rodz Painting | — | (650) 222 1120 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Rogers Electric Corp | Aaron Daniel Rogers | — | (650) 346 0981 | Electricians | Union City · Alameda County | — | — |
| Rohan Construction INC | Hector Villeda Hernandez | — | (408) 679 5171 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Rohit Pratap | Rohit Pratap | — | (510) 909 8597 | HVAC | Hayward · Alameda County | — | — |
| Rojas Painting | Rojas Painting | — | (510) 914 0410 | Windows, patio, painters | Pleasanton · Alameda County | — | — |
| Rojo Const | Rojo Const | — | (510) 552 7717 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Rojos Fences LLC | Torres Rogelio Paredes | — | (925) 339 5564 | Other | Livermore · Alameda County | — | — |
| Roland Zoller Construction | Roland Dominic Zoller | rolandzollerconstruction@gmail.com | (510) 491 3699 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Rolander Construction Company | Archimedes Bradley Robinson | — | (510) 339 3655 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Roldan Construction INC | Jeffrey James Jr Roldan | — | (510) 490 1395 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Rollin' Along INC | David Mitchell Lincer | — | (510) 215 0625 | Other | Oakland · Alameda County | — | — |
| Roman Cerny | Roman Cerny | — | (510) 384 6224 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Roman Hunt Restoration | Roman Hunt Restoration | — | (415) 948 7178 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Romano's Painting And Paperhanging Co INC | Jody O Chahine | — | (510) 670 1790 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Romanov Painting | Romanov Painting | — | (650) 867 6077 | Windows, patio, painters | Castro Valley · Alameda County | — | — |
| Romarts - Marble & Granite | Romarts - Marble & Granite | — | (510) 667 0857 | Other | San Leandro · Alameda County | — | — |
| Romeo Tile And Stone | Romeo Tile And Stone | — | (925) 216 9669 | Other | Pleasanton · Alameda County | — | — |
| Romero Glass Studios | Romero Glass Studios | — | (510) 533 1109 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Romo Home Improvement INC | Raymundo Azael Romo Martinez | — | (510) 760 2905 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ron Perez Construction LLC | Jeepreel Ronaldo Perez | — | (650) 814 2993 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Ron West Welding & Fabrication | Ron West Welding & Fabrication | — | (510) 710 5594 | Other | Oakland · Alameda County | — | — |
| Ron's Window Center | Ron's Window Center | — | (510) 410 3039 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Ronald F Picchi | Ronald F Picchi | — | (510) 387 6755 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ronbow Corporation | C King Hu | — | (510) 857 7138 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Rongjin Du | Rongjin Du | — | (626) 200 6772 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Ronson Shower Glass & Mirror INC | Kevin James Ebel | — | (510) 783 8510 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Rony's Electric | Cruz Rony | — | (510) 689 3467 | Electricians | Oakland · Alameda County | — | — |
| Roof Masters INC | Martinez Evictor Fajardo | — | (510) 860 6078 | Other roofers | Oakland · Alameda County | — | — |
| Roofing Logistics INC | Jose Rene Guerrero | — | (510) 878 2561 | Other roofers | San Leandro · Alameda County | — | — |
| Roofing Solutions INC | Ivan Maldonado | — | (510) 756 8782 | Other roofers | Hayward · Alameda County | — | — |
| Roofline Builders INC | David Stuart Lander | info@rooflinebuilders.com | (925) 201 1924 | Other roofers | Pleasanton · Alameda County | — | — |
| Rooflow INC | Erick Figueroa | — | (415) 425 5414 | Other roofers | Pleasanton · Alameda County | — | — |
| Roofology 101 INC | Armando Martinez-Sanchez | — | (510) 677 0959 | Other roofers | Hayward · Alameda County | — | — |
| Root Volume | Nicholas Gregory Grgurevic | dante@rootvolume.com | (510) 764 3169 | Windows, patio, painters | Alameda · Alameda County | — | — |