| Nurkal | Baser Orhan | — | (408) 887 2514 | GC, remodel, ADU | Santa Clara · Santa Clara County | — | — |
| Nursery Outlet Incorporated | Kenneth Jay Dufur | — | (408) 201 2911 | Windows, patio, painters | Gilroy · Santa Clara County | — | — |
| Nuvision Construction | Tomio Alexander Izumi | — | (650) 464 2137 | GC, remodel, ADU | Mountain View · Santa Clara County | — | — |
| Nw Sunstars Construction INC | Tu Ngoc Nguyen | — | (408) 717 2003 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| O & J Service LLC | Julio Roberto Jr Juarez | — | (650) 776 8484 | GC, remodel, ADU | East Palo Alto · Santa Clara County | — | — |
| O C Mc Donald Co INC | Matthew Victor Mc Donald | — | (408) 295 2182 | HVAC | San Jose · Santa Clara County | — | — |
| O C Plumbing | O C Plumbing | — | (408) 710 7840 | Other | San Jose · Santa Clara County | — | — |
| O D R Roofing | Ruiz Oscar | odrroofing@yahoo.com | (408) 590 5512 | Other roofers | San Jose · Santa Clara County | — | — |
| O G G Builders INC | Mario Valencia-Perez | — | (408) 210 3520 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| O G Painting | O G Painting | — | (408) 390 3305 | Windows, patio, painters | Sunnyvale · Santa Clara County | — | — |
| O K Contracting | Daniel Cornelius O'keefe | — | (650) 996 9668 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| O Leary Plumbing INC | David Martin O'leary | — | (415) 828 4651 | Other | Sunnyvale · Santa Clara County | — | — |
| O R Builders INC | Osbaldo Jose Romero | — | (650) 938 2222 | GC, remodel, ADU | Palo Alto · Santa Clara County | — | — |
| O R HVAC | O R HVAC | — | (669) 300 6108 | HVAC | San Jose · Santa Clara County | — | — |
| O S O Painitng | O S O Painitng | — | (408) 420 2417 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| O'connor And Son's Electric | Thomas Joseph O'connor | — | (650) 740 1121 | Electricians | Palo Alto · Santa Clara County | — | — |
| O'donnell Plastering INC | Jeffrey Paul O'donnell | eben@eyebytes.com | (408) 988 4965 | Windows, patio, painters | Santa Clara · Santa Clara County | — | — |
| O'grady Paving INC | Craig Edward Young | — | (650) 966 1926 | Other | Mt View · Santa Clara County | — | — |
| O'leary Renovations INC | Mike Brian O'leary | — | (408) 202 7582 | GC, remodel, ADU | Milpitas · Santa Clara County | — | — |
| O'neal Roofing INC | Cary Lee O'neal | — | (408) 848 3958 | Other roofers | Gilroy · Santa Clara County | — | — |
| O'neil's Lock & Key INC | Shari Lynn Taniguchi | — | (408) 946 0522 | Other | Santa Clara · Santa Clara County | — | — |
| O'neill Construction | Philip Christopher O'neill | oneillsusa5@aol.com | (415) 491-4091 | GC, remodel, ADU | Campbell · Santa Clara County | — | — |
| O-m Electrical Service INC Omers Systems Solutions | Miranda Osbaldo | — | (408) 693 7650 | Electricians | San Jose · Santa Clara County | — | — |
| Oak And Willow Construction | Hai Quoc Mac | — | (408) 772 1095 | GC, remodel, ADU | Los Gatos · Santa Clara County | — | — |
| Oak Hammer Construction | Gatica Ortiz Pedro | oakhcinc@gmail.com | (650) 793 7965 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Oak Hammer Construction INC | Ortiz Pedro Gatica | oakhcinc@gmail.com | (650) 793 7965 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Oakes Construction | Timothy Eugene Oakes | — | (650) 346 7012 | GC, remodel, ADU | Sunnyvale · Santa Clara County | — | — |
| Oakridge Construction INC | Roman Sergeevich Rodchenkov | contact@oakridgerenovation.com | (669) 204 2092 | GC, remodel, ADU | Santa Clara · Santa Clara County | — | — |
| Oasis Construction And Painting | Alvarez Daniel Fuentes | — | (650) 722 2376 | GC, remodel, ADU | East Palo Alto · Santa Clara County | — | — |
| Oasis Painting Ii | Abel Alvarez Fuentes | — | (650) 833 9655 | Windows, patio, painters | East Palo Alto · Santa Clara County | — | — |
| Oasis Tree Service | Sergio E Chavez Vargas | — | (408) 401 2096 | Other | San Jose · Santa Clara County | — | — |
| Obb Fences And Custom Gates INC | Bernabe Ruben Onofre | — | (408) 510 0423 | Other | San Jose · Santa Clara County | — | — |
| Obelisk Landscape Irragation Services | Jovanni Avalos | — | (669) 369 9622 | Windows, patio, painters | Campbell · Santa Clara County | — | — |
| Occhipinti Construction | Louis Anthony Occhipinti | — | (408) 386 8891 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Ocean 100 Electric INC | Ervin M Barrientos Trigueros | — | (669) 216 7098 | Electricians | San Jose · Santa Clara County | — | — |
| Ocean General Contractors LLC | Noe Alexis Guzman | bluecollarcorgis@gmail.com | (408) 679 8566 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Ocean View Landscaping Services INC | Toribio Nestor | — | (650) 325 4793 | Windows, patio, painters | Palo Alto · Santa Clara County | — | — |
| Ocegueda Builders INC | Ocegueda Delgado Jose | — | (408) 991 3554 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Ochoa Landscape Services | Franco Yosset Ochoa Carballo | — | (408) 569 0347 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| Ochoa Plumbing Sewers & Drains | Ochoa Plumbing Sewers & Drains | — | (408) 613 6345 | Other | Sunnyvale · Santa Clara County | — | — |