| No Limit Hauling & Demolition | No Limit Hauling & Demolition | — | (209) 818 8979 | Other | Turlock · Stanislaus County | — | — |
| Noble Concrete Co LLC | Jonathan Leon Rhodes | asolomatin@nobleconcrete.com | (403) 732-5628 | Other | Ceres · Stanislaus County | — | — |
| Noble Plumbing INC | Jonathan Roberto Trujillo | — | (209) 566 5420 | Other | Modesto · Stanislaus County | — | — |
| Noel's Electrical Contracting Services | Noel St John Christy | — | (209) 236 1030 | Electricians | Modesto · Stanislaus County | — | — |
| Nor-cal Air Conditioning | James David Ii Fernandes | — | (209) 847 3030 | HVAC | Oakdale · Stanislaus County | — | — |
| Nor-cal Drywall Solutions | Mario Alberto Lira Lopez | — | (209) 289 1813 | Other | Ceres · Stanislaus County | — | — |
| Nor-cal Infrastructure Co | Hung Duc Tran | — | (209) 581 5388 | Other | Patterson · Stanislaus County | — | — |
| Nor-cal Overhead Doors | Nor-cal Overhead Doors | — | (209) 495 9555 | Other | Hughson · Stanislaus County | — | — |
| Nor-cal Steel Structures | Tony Hernandez | — | (209) 589 9958 | Other | Modesto · Stanislaus County | — | — |
| Norberto Carlos Cardoso | Norberto Carlos Cardoso | — | (209) 892 5831 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| Norcal Construction Poultry Specialist INC | Gilbert Leroy Junstrom | — | (209) 667 2400 | Other | Turlock · Stanislaus County | — | — |
| Norcal Landscapes | Norcal Landscapes | — | (209) 840 0968 | Windows, patio, painters | Oakdale · Stanislaus County | — | — |
| Norcal Mechanical | Norcal Mechanical | shawn@norcalmechanical.com | (209) 324 8979 | HVAC | Ceres · Stanislaus County | — | — |
| Norcal Pools INC | Alexander Lopez | — | (209) 808 4947 | Pool | Turlock · Stanislaus County | — | — |
| Norman Eric Shepherd | Norman Eric Shepherd | — | (209) 298 2789 | Other | Modesto · Stanislaus County | — | — |
| North Bay Equipment Service & Sales INC | James Leroy O'connell | — | (707) 585 0100 | Other | Modesto · Stanislaus County | — | — |
| North Cali Flooring | North Cali Flooring | northcaliflooring@gmail.com | (209) 214 3523 | Other | Modesto · Stanislaus County | — | — |
| North Valley Construction | North Valley Construction | — | (209) 605-9589 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| North Valley Electric LLC | Joshua Jeremy Hayes | anapbm@gmail.com | (209) 652 4452 | Electricians | Turlock · Stanislaus County | — | — |
| Northern California Framing & Carpentry INC DBA Nor - Cal Buildin | Juan Hernandez Zambrano | — | (916) 825 9756 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Northern Drywall INC | Michael Anthony Enriquez | — | (209) 602 3190 | Other | Modesto · Stanislaus County | — | — |
| Northern Glass Co | Michael John Peadon | — | (650) 868 6894 | Windows, patio, painters | Riverbank · Stanislaus County | — | — |
| Northern Steel INC | Eugene A Thiel | — | (209) 527 7934 | Other | Modesto · Stanislaus County | — | — |
| Northstar Construction & Restoration Services Corp | Jonathan Jay Fisher | — | (888) 959 9460 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Northstar Construction Group INC | Fred Bernardino Quilantang | info@northstarconstruction.org | (888) 959 9460 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Northwest Industrial Engine & Compressor Co | Gavin Deon Yates | — | (209) 847 2299 | Other | Riverbank · Stanislaus County | — | — |
| Nova Building & Design | Nova Building & Design | — | (949) 413 1800 | Electricians | Turlock · Stanislaus County | — | — |
| Nova Master Builders Group Limited Liability Company | Josue Isay Delgado Lopez | — | (209) 449 5807 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Nt Electric LLC | Neil Ryan Teague | — | (209) 534 1446 | Electricians | Turlock · Stanislaus County | — | — |
| Nu Exteriors | Christopher Phillip Maxwell | — | (209) 481 0946 | Windows, patio, painters | Waterford · Stanislaus County | — | — |
| Nx Stage Security LLC | Matthew James Mcnulty | — | (209) 495 8536 | GC, remodel, ADU | Riverbank · Stanislaus County | — | — |
| O R Construction Innovations | Orozco Jose | — | (209) 450 7424 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| O R Enterprises INC DBA O'leary Rowan Data Systems | Roger Ryann Rowan | — | (209) 530 1700 | Other | Modesto · Stanislaus County | — | — |
| O.h. Builders INC | Herrera Urbano Oscar | — | (209) 853 1320 | GC, remodel, ADU | Waterford · Stanislaus County | — | — |
| Oa Cabinets LLC | Oscar Jr Alvarez | — | (209) 226 8526 | Other | Turlock · Stanislaus County | — | — |
| Oak Valley Construction | Edgar Donald Snider | — | (209) 613 3424 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Oak Valley Excavating INC | James Joseph Arhontes | — | (209) 602 5709 | Other | Oakdale · Stanislaus County | — | — |
| Oakdale Fence Co | Robert Sterling Sehl | contact@oakdalefence.com | (209) 841-4151 | Other | Oakdale · Stanislaus County | — | — |
| Oakdale Glass INC | Santiago Lumahan Robillos | — | (209) 322 2099 | Windows, patio, painters | Oakdale · Stanislaus County | — | — |
| Oakdale Refrigeration Heating & Air Conditioning | Eddie Ray Eagleton | — | (209) 847 3935 | HVAC | Oakdale · Stanislaus County | — | — |