| Hz Floors | Hz Floors | — | (831) 419 7982 | Other | Santa Cruz · Santa Cruz County | — | — |
| I Build Construction | Eugene John Chaput | — | (831) 535 3976 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| I F Tile | I F Tile | — | (408) 438 8583 | Other | Watsonville · Santa Cruz County | — | — |
| I Paint Co Decorative Finishing Services | Lawrence Lee Iii Ingram | — | (831) 888 6468 | Windows, patio, painters | Aptos · Santa Cruz County | — | — |
| Ian Keeler Construction | Ian Christopher Keeler | — | (831) 818 5897 | GC, remodel, ADU | Felton · Santa Cruz County | — | — |
| Iberia Woodworks | Iberia Woodworks | — | (650) 868 2572 | Other | Santa Cruz · Santa Cruz County | — | — |
| Imperial Construction Services Crc INC | Jose Miguel Salgado | — | (831) 345 0176 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| Impression Painting | Impression Painting | contactus@impressionpainting.com | (831) 288 4699 | Windows, patio, painters | Watsonville · Santa Cruz County | — | — |
| In 2 Building Construction | Charles Manuel Soares | — | (831) 296 9763 | GC, remodel, ADU | Freedom · Santa Cruz County | — | — |
| Incal Construction | Amolak Singh Sarai | — | (831) 706 6212 | GC, remodel, ADU | Freedom · Santa Cruz County | — | — |
| Industrial Control Systems | Industrial Control Systems | — | (831) 970 1931 | Electricians | Aptos · Santa Cruz County | — | — |
| Infinite Home Solutions INC | Jakub Kalinowski | interested@domainmarket.com | (845) 332 7029 | Windows, patio, painters | Santa Cruz · Santa Cruz County | — | — |
| Infrastructure Technology Systems INC | Kelly Ryan Hurst | — | (831) 427 1355 | Other | Scotts Valley · Santa Cruz County | — | — |
| Innovative Management And Design INC | Mark Beecher Smith | — | (408) 335 3560 | GC, remodel, ADU | Capitola · Santa Cruz County | — | — |
| Inspired Building And Renovation | Inspired Building And Renovation | — | (831) 750 2754 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Inspired Electrical | Sardina Salvatore | — | (831) 750 2754 | Electricians | Santa Cruz · Santa Cruz County | — | — |
| Inspiring Designs Construction | Jesse James Jarvie | — | (808) 214 3218 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| Integra Builder INC | Shane Dylan-Townse Endsley | — | (831) 331 0815 | GC, remodel, ADU | Scotts Valley · Santa Cruz County | — | — |
| Integra Builders INC | Jeffery Dean Murray | — | (831) 566 6739 | GC, remodel, ADU | Boulder Creek · Santa Cruz County | — | — |
| Integrated Ecological Services | John Edmund Pritchard | — | (831) 254 2767 | Windows, patio, painters | Watsonville · Santa Cruz County | — | — |
| Integrated Residential Electrical Systems | William Harold Ii Kingsley | — | (831) 246 0045 | Electricians | Santa Cruz · Santa Cruz County | — | — |
| Intellifac Services LLC | Robert J Dills | — | (650) 444 4504 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| Intelligent Electronic Solutions | Intelligent Electronic Solutions | — | (831) 728 1999 | Electricians | Aptos · Santa Cruz County | — | — |
| Interface Builders | Interface Builders | — | (831) 419 6330 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| Interior Vision Flooring & Design | Deborah Marie Cypert | — | (831) 476 8780 | Other | Soquel · Santa Cruz County | — | — |
| Interlite INC | Dale William Paris | — | (831) 462 1700 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| Intermountain Slurry Seal INC | Ashley Marie Stinson | — | (831) 768 4086 | Other | Watsonville · Santa Cruz County | — | — |
| Ironback Construction | Kenneth Dean Dore | — | (831) 888 7579 | GC, remodel, ADU | La Selva Beach · Santa Cruz County | — | — |
| Iverson Tile & Stone | Iverson Tile & Stone | — | (831) 359 8176 | Other | Felton · Santa Cruz County | — | — |
| J & R Custom Painting | Elizabeth Ann Marani-Schaefer | — | (408) 489 5806 | Windows, patio, painters | Scotts Valley · Santa Cruz County | — | — |
| J And S Professional Painting Co. | Gerald Francis Shanahan | — | (831) 334 9341 | Windows, patio, painters | Aptos · Santa Cruz County | — | — |
| J B Building | J B Building | — | (831) 588 6674 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| J B Construction | Basilio Jesus | — | (831) 539 1724 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| J C Builders | J C Builders | — | (831) 325 1289 | GC, remodel, ADU | Aptos · Santa Cruz County | — | — |
| J C Heating & Air Conditioning INC | Richard Allen Forno | — | (831) 475 6538 | HVAC | Soquel · Santa Cruz County | — | — |
| J Fisher Plumbing | J Fisher Plumbing | — | (831) 345 5316 | Other | Felton · Santa Cruz County | — | — |
| J G Pro Painting | Jesse Ray Gullings | jgpainting619@gmail.com | (831) 278 1588 | Windows, patio, painters | Capitola · Santa Cruz County | — | — |
| J Hamilton Construction INC | Justin Joseph Hamilton | — | (831) 440 8020 | GC, remodel, ADU | Soquel · Santa Cruz County | — | — |
| J Herting Construction | Justin Henry Herting | — | (831) 566 1475 | Other | Felton · Santa Cruz County | — | — |
| J Johnson & Company Incorporated | James Jeffrey Johnson | — | (831) 722 8452 | Other | Watsonville · Santa Cruz County | — | — |