| Nop Pantichpakdi | Nop Pantichpakdi | — | (831) 251 1907 | Windows, patio, painters | Aptos · Santa Cruz County | — | — |
| Nor - Cal Iron Works | Nor - Cal Iron Works | — | (831) 435 6516 | Other | Watsonville · Santa Cruz County | — | — |
| Nor - Cal Refrigeration | Nor - Cal Refrigeration | — | (831) 334 6618 | HVAC | Santa Cruz · Santa Cruz County | — | — |
| Norcal Builders | Chaz Sumner Schuck | — | (831) 900 8254 | Electricians | Felton · Santa Cruz County | — | — |
| Norcal Coast Construction INC | Joel Phillip Tavera-Ortiz | — | (831) 247 5302 | GC, remodel, ADU | Freedom · Santa Cruz County | — | — |
| Normington Builders INC | David Andrew Normington | — | (831) 325 3269 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| North Cal Engineering INC | Rene Rico Cardona | — | (831) 212 4556 | Other | Watsonville · Santa Cruz County | — | — |
| North Coast Remediation INC | David Clifton Getchell | — | (831) 621 2400 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| North Glass Windows & Doors INC | Elizabeth Karen North | — | (831) 336 2288 | Windows, patio, painters | Ben Lomond · Santa Cruz County | — | — |
| North Harbor Construction INC | Lewis Ray-bacigalu Piona | lew@northharborcon.com | (831) 334 3773 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| North Polo Builders | North Polo Builders | — | (831) 332 4505 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| North Shore Builders INC | Justin John O'brien | — | (831) 600 6337 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| North West Signs INC | Jeffery Thomas Frank | cody@northwestsigns.com | (831) 469 8208 | Other | Santa Cruz · Santa Cruz County | — | — |
| Northbay Electric | Noel Eugene Scott-behrends | northbayelectric@charter.net | (310) 456-7076 | Electricians | Soquel · Santa Cruz County | — | — |
| Northern Pacific Painting | Northern Pacific Painting | — | (831) 262 8707 | Windows, patio, painters | Freedom · Santa Cruz County | — | — |
| Northridge Construction | Alec David Roberts | info@northridgeconstruction.com | (408) 355 3012 | GC, remodel, ADU | Scotts Valley · Santa Cruz County | — | — |
| Northwest Construction | Kirk Thomas Wienenga | — | (831) 251 0691 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| Northwest Point Construction | Mendoza Mendoza Arturo | — | (831) 750 4449 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| Novak Plumbing LLC | Timothy Christopher Rudolph | — | (831) 818 7082 | Other | Boulder Creek · Santa Cruz County | — | — |
| Novin Construction | Abdol Hossein Novin | — | (831) 768 8373 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| Ns Construction | Silva Josue | — | (831) 566 4152 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| Nv Construction | Nathaniel Valentin Belenky | — | (831) 435 0737 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| O G Construction | Garcia Rodriguez Omar | — | (831) 262 2611 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| O M Builders INC | Richmond Curtis Furnish | — | (831) 325 7052 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| O2 Termite INC | O2 Termite INC | — | (831) 359-4627 | Pest, tile roofs | Santa Cruz · Santa Cruz County | — | — |
| Oakleaf Woodworks LLC | Hector Jesus Guerrero | — | (831) 247 9571 | Other | Watsonville · Santa Cruz County | — | — |
| Oca Builders | Construction Company & Adu Contractor | Oca Builders | Construction Company & Adu Contractor | — | (831) 266-5915 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Oca Builders: Adu Construction | Oca Builders: Adu Construction | — | (831) 425-9183 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Old Coast Construction | Alexander Martin Budka | — | (831) 521 6976 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Old Gold Sheetmetal | Old Gold Sheetmetal | — | (831) 212 1305 | Other | Capitola · Santa Cruz County | — | — |
| Oliveira & Sons | Oliveira & Sons | — | (831) 239 9655 | GC, remodel, ADU | Felton · Santa Cruz County | — | — |
| Oliveira Plastering Lathing & Drywall INC | Jason James Souza | — | (831) 722 5561 | Other | Watsonville · Santa Cruz County | — | — |
| Olmeda Painting | Olmeda Painting | — | (831) 706 0611 | Windows, patio, painters | Santa Cruz · Santa Cruz County | — | — |
| Olson Electric | Edwin Orville Jr Olson | — | (408) 406 2004 | Electricians | Bonny Doon · Santa Cruz County | — | — |
| Om Anand | Om Anand | — | (831) 479 3590 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| On Point Design And Build | Tobias Luke Chapman | — | (415) 302 8355 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| On The Level Construction | Gabreal Patsel Pogrowski | — | (760) 310 9987 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| One To One Landscape Design | One To One Landscape Design | — | (831) 359 1228 | Windows, patio, painters | Watsonville · Santa Cruz County | — | — |
| One Way Electric | Hernandez Cesar | — | (831) 254 4158 | Electricians | Watsonville · Santa Cruz County | — | — |
| Onenorth Security Camera Service | Onenorth Security Camera Service | — | (831) 334-5712 | Alarm and generators | Santa Cruz · Santa Cruz County | — | — |