| Rab-com Limited | Stephen Thomas Wyszomirski | — | (510) 537 8601 | Electricians | Hayward · Alameda County | — | — |
| Rabboni Mechanical INC | Ojeda Jose | services@rabbonimechanical.com | (510) 682 8449 | HVAC | Union City · Alameda County | — | — |
| Racks & Shelving | Racks & Shelving | — | (510) 785 3624 | Other | Hayward · Alameda County | — | — |
| Radiant Construction Company | Chi Thang Tran | interested@domainmarket.com | (415) 250 4218 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Radius Construction | Gonzalez Eduardo Reynaga | — | (503) 679 0357 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Radman Electric | Radmanovic Nenad | — | (510) 755 8369 | Electricians | Hayward · Alameda County | — | — |
| Radvand Construction INC | Radvand Shahin | — | (669) 666 0838 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Ragadan Painting Company | Daniel De Jesus Ramirez Galvez | — | (415) 724 4450 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Rago Neon INC | Antone F Ii Rago | — | (510) 537 1903 | Other | Hayward · Alameda County | — | — |
| Rahebi Construction Company | Bob Babak Rahebi | — | (510) 792 1727 | Other | Oakland · Alameda County | — | — |
| Rahi Construction Services | David Lee Haynes | — | (510) 651 2205 | Other | Fremont · Alameda County | — | — |
| Rain Defense | Jose Antonio Farias | info@raindefense.com | (510) 769 0102 | Other roofers | Hayward · Alameda County | — | — |
| Rainbow Construction LLC | Rongchang Huang | — | (510) 517 2117 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Raingarden Tile And Design | Raingarden Tile And Design | — | (510) 206 6481 | Other | Berkeley · Alameda County | — | — |
| Raisig Construction | Peter Edward Raisig | — | (510) 409 9369 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Raito INC | Thomas Chris Mc Ghee | — | (510) 259 9900 | Other | Union City · Alameda County | — | — |
| Raj Construction | Raj Sukhdev | — | (510) 750 4212 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Raj Design And Construction | Chatterjee Pallav | — | (925) 209 0329 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Ralph J Nice | Ralph J Nice | — | (510) 935 9129 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Ralph V Fernandez | Ralph V Fernandez | — | (925) 487 3934 | Other | Pleasanton · Alameda County | — | — |
| Ralston Design Build | Bennett C Ralston | — | (510) 240 2003 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ram West INC | Michael Pui Hung | — | (415) 828 2216 | Other | Oakland · Alameda County | — | — |
| Ramar Plumbing | Martinez Rafael Ramirez | ramar5440@yahoo.com | (925) 337 5440 | Other | Livermore · Alameda County | — | — |
| Ramirez Floor Covering | Ramirez Floor Covering | — | (510) 258 3628 | Other | Oakland · Alameda County | — | — |
| Ramirez Painting | Ramirez Painting | — | (415) 637 4879 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Ramirez Remodeling | Ramirez Remodeling | — | (510) 830 9963 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ramlochan Construction | Ramlochan Ramkumar | — | (510) 390 4880 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Ramon's Landscaping Service INC | Gurrola Ramon Sanchez | — | (510) 680 9392 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Ramos Construction | Juan Manuel Ramos | interested@domainmarket.com | (510) 301 6271 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Ramos Remodeling | Ramos Remodeling | jmr@ramos-remodeling.com | (510) 395 0838 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Randall Alan Wolf | Randall Alan Wolf | — | (510) 490 1115 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Randazzo Constructions INC | John Vincent Leo Randazzo | — | (510) 304 7116 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Randy Colosky Design | Randy Colosky Design | — | (415) 370 3969 | Other | Oakland · Alameda County | — | — |
| Randy Laubhan Contractor | Randy Laubhan Contractor | — | (916) 730 0784 | Electricians | Pleasanton · Alameda County | — | — |
| Rangel Concrete | Rangel Concrete | — | (510) 314 4263 | Other | San Lorenzo · Alameda County | — | — |
| Ranks Construction LLC | Jose Luis Jr Becerra | — | (510) 827 6618 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ransome Company | Peter Winchester Knuth | — | (510) 686 9900 | Electricians | San Leandro · Alameda County | — | — |
| Ranulfo Dorantes | Ranulfo Dorantes | — | (510) 472 7466 | Other | Hayward · Alameda County | — | — |
| Raphael's Tree Service | Raphael Francisco Vieira | — | (510) 282 9375 | Other | Oakland · Alameda County | — | — |
| Rapid Services LLC DBA Rapid Grading Services | Jeet Kaur | — | (510) 980 0102 | Other | Hayward · Alameda County | — | — |