| Norcal Fence | Norcal Fence | — | (209) 747 6134 | Other | Lodi · San Joaquin County | — | — |
| Norcal Integration INC | Albert Torres Sunglao | — | (209) 513 7498 | Other | Stockton · San Joaquin County | — | — |
| Norcal Petroleum Tank Testing | David Anthony Winkler | — | (209) 712 6366 | Other | Acampo · San Joaquin County | — | — |
| Norcal Property Preservation General Construction | Daniel Steven Perez | — | (209) 237 6575 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Norcal Specialties LLC | Peter Christian Anderson | eben@eyebytes.com | (209) 475 8296 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Norcal Sun Control - Window Treatments | Miguel Joao Freitas | — | (408) 515 0222 | Other | Tracy · San Joaquin County | — | — |
| Norcal Welding INC | Karl Vincent Wall | service@norcalwelding.com | (209) 597 8265 | Other | Tracy · San Joaquin County | — | — |
| Noriega Plumbing Systems | Noriega Plumbing Systems | — | (209) 229 0250 | Other | Stockton · San Joaquin County | — | — |
| Normandy Heating & Air INC | Norman John Jr Provost | — | (510) 470 8878 | HVAC | Stockton · San Joaquin County | — | — |
| Norris Landscaping | Norris Landscaping | — | (209) 639 8432 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| North California Rebar | North California Rebar | — | (209) 505 5913 | Other | Manteca · San Joaquin County | — | — |
| North Star Drilling INC | Peter Fidencio Hernandez | — | (209) 484 5485 | Other | Escalon · San Joaquin County | — | — |
| North State Construction INC | Jeremy Ray Gann | — | (209) 858 9766 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| North Valley Installation | North Valley Installation | — | (209) 481 2958 | Other | Lodi · San Joaquin County | — | — |
| North West Framer | North West Framer | northwestframer@gmail.com | (925) 775 9151 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Northern California Image Flooring INC | Shatona Lewis Thornton | — | (510) 472 3219 | Other | Tracy · San Joaquin County | — | — |
| Northern California Roofing And Waterproofing INC | Dann Richard Heath | — | (510) 867 8772 | Other roofers | Manteca · San Joaquin County | — | — |
| Northern Industries INC | Ivan Gutierrez | — | (669) 252 6821 | Other | Manteca · San Joaquin County | — | — |
| Northern Valley Flooring | Northern Valley Flooring | — | (916) 286 9899 | Other | Stockton · San Joaquin County | — | — |
| Northline Builders LLC | Randy Jacob James | — | (209) 819 0002 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Norymar Maintenance INC | Manuel Fonseca Razo | — | (209) 951 1777 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Ntel Networks | Reynaldo Picardal Gacad | — | (408) 687 1499 | Other | Tracy · San Joaquin County | — | — |
| Nu Visions | Nu Visions | — | (209) 298 0299 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Nunez Landscape Services INC | Valdivia Rafael Nunez | — | (510) 289 3594 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Nushake Roofing | Brian Miguel Espindola | office@nushake.com | (209) 253 0506 | Other roofers | Ripon · San Joaquin County | — | — |
| O & C Custom Painting INC | Ricardo Ochoa Torres | — | (209) 810 2765 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| O A R Heating & Air | Hassem Mohammad Samara | — | (209) 271 3262 | HVAC | Stockton · San Joaquin County | — | — |
| O H Construction | Huerta Hernandez Osbaldo | — | (209) 298 4915 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| O M A Drywall & Renovations | Kurt Allen Voorhies | — | (209) 747 1871 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| O River Construction | Nadine A Hutton | — | (510) 325 1754 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| O'brien Crane & Rigging INC | Gerald Edward Shipman | — | (209) 462 7372 | Other | Stockton · San Joaquin County | — | — |
| O'brien Steel Erectors INC | Randy Neil Shipman | — | (209) 462 7377 | Other | Stockton · San Joaquin County | — | — |
| O'reilly's Construction | Randall Michael O'reilly | hello@rfuenzalida.com | (707) 245 3135 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Oak Valley Landscape | Oak Valley Landscape | — | (925) 518 3801 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Oakland Trenchless & Rooter | Jauregui Antonio | — | (510) 867 0756 | Other | Tracy · San Joaquin County | — | — |
| Oc Drywall | Oc Drywall | — | (510) 754 6698 | Other | Stockton · San Joaquin County | — | — |
| Ocegueda Mechanical INC | William Ocegueda | — | (510) 566 5741 | HVAC | Manteca · San Joaquin County | — | — |
| Odyssey Construction | Dimitrios Karapanos | — | (209) 727 7042 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Ofield Electrical INC | Salazar Christian Ocampo | — | (323) 532 1120 | Electricians | Stockton · San Joaquin County | — | — |
| Ojeda Construction | Daniel Victor Ojeda | ojedaconstructionll@gmail.com | (209) 321 7855 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |