| Jesus J Rodriguez | Jesus J Rodriguez | — | (831) 801 8946 | HVAC | Hollister · San Benito County | — | — |
| Jg Builder Construction Services INC | Joseph Anthony Jr Guerrero | — | (831) 265 9696 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Jim Giancola Concrete | Jim Giancola Concrete | — | (831) 801 6230 | Other | San Juan Bautista · San Benito County | — | — |
| Jim's Backhoe Service | James Farnsworth Stoner | — | (408) 422 2946 | Other | Hollister · San Benito County | — | — |
| Jimenez & Baltazar Lathing And Plastering | Luis Eduardo Baltazar Jimenez | — | (408) 910 7729 | Other | Hollister · San Benito County | — | — |
| Jj's Plumbing & Rooter | Jj's Plumbing & Rooter | — | (831) 664 6110 | Other | Hollister · San Benito County | — | — |
| Jnd Construction | Jorge Carrillo Garcia | — | (408) 406 2635 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Joe Adams Cabinetry | Joe Adams Cabinetry | — | (831) 345 3713 | Other | San Juan Bautista · San Benito County | — | — |
| Joe Hayward | Joe Hayward | — | (831) 801 7054 | Other | Hollister · San Benito County | — | — |
| Joe Telles Construction | Joseph Quint Telles | — | (831) 801 5481 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Joey Vallejo | Joey Vallejo | joey@joeyvallejo.com | (831) 801 0998 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| John Baker Construction | John Everett Baker | — | (831) 801 2047 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| John Casalegno Concrete Construction | John J Casalegno | — | (408) 279 8036 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| John Durden | John Durden | — | (831) 750 5521 | Other | San Juan Bautista · San Benito County | — | — |
| John Patrick Montgomery DBA Patrick Flooring | Patrick Flooring | — | (650) 678 8904 | Other | Hollister · San Benito County | — | — |
| John Williams | John Williams | — | (831) 578 6036 | Electricians | Hollister · San Benito County | — | — |
| Johnson Pump Company | Karl Thomas Johnson | — | (831) 596 8881 | Other | Hollister · San Benito County | — | — |
| Jon Bartz Construction | Jon Karyl Jeffrey Laurie-bartz | — | (456) 806 0228 | GC, remodel, ADU | San Juan Bautista · San Benito County | — | — |
| Jose H Talavera | Jose H Talavera | — | (408) 316 2693 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Josh Watt Electric INC | Josh Watt | — | (831) 637 1000 | Electricians | Hollister · San Benito County | — | — |
| Jp Grewell Plumbing | Jp Grewell Plumbing | — | (831) 392 5304 | Other | Hollister · San Benito County | — | — |
| Js HVAC Service | Js HVAC Service | — | (858) 387-6549 | HVAC | Del Mar · San Benito County | — | — |
| Just Green Landscaping Inc. | Just Green Landscaping Inc. | justgreenlandscaping@gmail.com | (442) 278-9758 | Tree | San Marcos · San Benito County | — | — |
| K C J Welding | Carlos Aispuro | — | (831) 320 3359 | Other | San Juan Bautista · San Benito County | — | — |
| Keen Electric | James Robert Keen | — | (831) 419 1651 | Electricians | Tres Pinos · San Benito County | — | — |
| Kerry Maroney | Kerry Maroney | — | (831) 801 8583 | Other | Tres Pinos · San Benito County | — | — |
| Kings Flooring And Installation INC | Crispin Reyes-Cruz | — | (805) 253 6325 | Other | San Juan Bautista · San Benito County | — | — |
| Klines Plumbing | Klines Plumbing | — | (805) 305 1781 | Other | Hollister · San Benito County | — | — |
| Ko B Cooper | Ko B Cooper | — | (831) 801 3149 | Other | San Juan Bautista · San Benito County | — | — |
| Kraig Klauer INC | Kraig Thomas Klauer | — | (831) 801 5950 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Kustom Cal Plumbing INC | Antonio Esquivel Jr Hernandez | — | (831) 207 7930 | Other | Hollister · San Benito County | — | — |
| Lawrence M Willis | Lawrence M Willis | — | (831) 623 2900 | GC, remodel, ADU | San Juan Bautista · San Benito County | — | — |
| Lee Landscaping | Lee Landscaping | — | (831) 636 4810 | Windows, patio, painters | Hollister · San Benito County | — | — |
| Lerma Contruction INC | Gregory Wayne Stanich | — | (831) 664 6287 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Lindgren Construction | Eric Alexander Lindgren | — | (408) 639 7310 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Lisle Tile And Stone INC | Austin Matthew Lisle | — | (831) 717 9933 | Other | Hollister · San Benito County | — | — |
| Llano INC | Robert Foster Enz | — | (831) 801 0060 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| Lloyd Pest & Termite Control | Lloyd Pest & Termite Control | — | (760) 744-3030 | Pest, tile roofs | San Marcos · San Benito County | — | — |
| Lobos Drywall | Antonio Villalobos Cadena | info@lobosdrywall.com | (831) 297 6395 | Other | Hollister · San Benito County | — | — |
| Lopez Plastering INC | Vera Alan Lopez | — | (408) 836 0462 | Other | Hollister · San Benito County | — | — |