| R Gonzalez Painting Co | Reyes Raul Gonzalez Alonzo | — | (510) 847 4267 | Windows, patio, painters | Oakland · Alameda County | — | — |
| R H S Construction | Ryan Henry Stuart | — | (510) 943 2466 | GC, remodel, ADU | Newark · Alameda County | — | — |
| R I Best Construction | Tudzinovic Izet | — | (510) 381 9362 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| R J Building Contractor | R J Building Contractor | — | (510) 907 0144 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| R J Construction | Ruan Jiajun | — | (510) 289 0081 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| R J H Construction | Robert John Harmola | — | (510) 566 0353 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| R J Heating & Air Conditioning | Robert Jason Lovely | — | (510) 821 4162 | HVAC | Fremont · Alameda County | — | — |
| R J Morrow Painting And Decorating | Ronald John Morrow | — | (510) 841 9605 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| R J S & Associates INC | David G Holley | — | (510) 670 9111 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| R K Electric INC | Richard George Skibinski | info@rkelectric.com | (510) 770 5660 | Electricians | Fremont · Alameda County | — | — |
| R K Roofing & Construction INC | Richard Seunghyok Kang | — | (510) 385 9518 | Other roofers | San Leandro · Alameda County | — | — |
| R L Construction | Lamberto Baz Jr Ramonal | — | (510) 461 2848 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| R L Stevens Company | David Bryan Stevens | — | (510) 823 9010 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| R L Western INC | Robert Len Law | — | (925) 551 7171 | Other roofers | Dublin · Alameda County | — | — |
| R O C Construction | Matthew Gene Muchnick | — | (510) 910 7321 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| R P Coatings INC | Julie Kim Nemeth | — | (510) 429 5940 | Other | Hayward · Alameda County | — | — |
| R P Russell Electric | Ronald Penrose Russell | — | (925) 628 4730 | Electricians | Hayward · Alameda County | — | — |
| R P S Teledata | R P S Teledata | — | (510) 706 3211 | Other | San Lorenzo · Alameda County | — | — |
| R Perez General Contractor INC | Edwin Rolando Perez | — | (510) 472 3905 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| R Powala Corporation | Powala Remigiusz | — | (510) 368 2289 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| R Powell Mechanical | R Powell Mechanical | — | (510) 406 1550 | HVAC | Oakland · Alameda County | — | — |
| R Pringle Construction | Richard Alan Pringle | — | (925) 606 0795 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| R Pringle Construction INC | Richard Alan Pringle | — | (925) 606 0795 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| R Pro Electric INC | Richard Earl Jr Dickinson | office@rproelectric.com | (510) 876 3522 | Electricians | Fremont · Alameda County | — | — |
| R Q S Concrete INC | Rafael Galindo Sr Quiroga | jaime@rqsconcrete.com | (510) 780 9553 | Other | Hayward · Alameda County | — | — |
| R Quality Painting INC | Jose Humberto Ramirez-felix | — | (510) 431 3053 | Windows, patio, painters | Union City · Alameda County | — | — |
| R S Construction Co | Ronald Gary Silva | — | (510) 785 9099 | Electricians | Hayward · Alameda County | — | — |
| R S General Construction | Liu Zhongmin | — | (408) 569 6688 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| R S M Custom Overhead Garage Doors | Raymond Anthony Martinez | — | (408) 509 2023 | Other | Fremont · Alameda County | — | — |
| R S V P Development & Construction | Robert Steven Paul Martinez | — | (510) 755 7834 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| R Scott Johnson Building Co | Robert Scott Johnson | — | (510) 604 2883 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| R T Construction Co | Ronald Theodore Lundgren | — | (510) 410 3780 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| R T L Construction And Development | Robert Theodore Lewis | — | (925) 395 6164 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| R Valencia Landscape LLC | Mata Claudia | — | (925) 337 1287 | Windows, patio, painters | Livermore · Alameda County | — | — |
| R W Company | Ritchie King Yu | — | (510) 470 0142 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| R Y Pacific Plumbing INC | Robert Yang | — | (415) 830 0825 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| R Zaballos & Sons Incorporated | Steven Michael Zaballos | — | (510) 581 5993 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| R&l Maintenance & Janitorial INC | Saul Enrique Zelaya | — | (415) 996 4577 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| R&s General Construction INC | Roberto Jr Solorzano | — | (510) 362 9727 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| R&s Paving INC | Ricardo Flores | — | (510) 708 7444 | Other | Hayward · Alameda County | — | — |