| J Cellar Construction | Jason Howard Cellar | — | (805) 748 1200 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| J D Construction | Jeremy Lane Dortch | — | (805) 440 6927 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| J D Enterprises | James William Martin | hello@jdenterpises.com | (559) 381 0413 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| J D M Construction | Joel Dean Martinez | — | (805) 801 6669 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| J D Moody Construction | Joshua David Moody | — | (805) 316 1217 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| J D R Electric | Justin David Rodgers | — | (805) 801 9231 | Electricians | Morro Bay · San Luis Obispo County | — | — |
| J D S Construction | James Donald Jr Schmidt | — | (805) 550 1087 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| J D's Painting | J D's Painting | — | (805) 423 6485 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| J Davis Drywall | J Davis Drywall | — | (805) 471 4315 | Other | Atascadero · San Luis Obispo County | — | — |
| J Doyle Landscaping Co | John Jay Doyle | — | (805) 748 7190 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| J E Marett | J E Marett | — | (805) 458 4597 | GC, remodel, ADU | Santa Margarita · San Luis Obispo County | — | — |
| J E Y Construction Co | James Edward Young | — | (805) 402 5979 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| J Ferreira Construction INC | Justin Matthew Ferreira | — | (805) 423 8513 | Other | Templeton · San Luis Obispo County | — | — |
| J G Construction A Partnership | John Gilbert King | — | (805) 541 3333 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| J G Contracting | Jeffrey Dean Gamble | — | (805) 723 5067 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| J Garcia Earthworks INC | Joseph D Garcia | — | (805) 459 1683 | Other | Atascadero · San Luis Obispo County | — | — |
| J Henson | J Henson | — | (805) 528 9532 | Other | Los Osos · San Luis Obispo County | — | — |
| J Herbstreith Electric | Jeffrey Lynn Herbstreith | — | (805) 440 1789 | Electricians | Nipomo · San Luis Obispo County | — | — |
| J Herrera Construction INC | Jerome Frank Jr Herrera | — | (805) 863 4674 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| J House Electric | Cliff Ivan Juretich | — | (805) 358 4806 | Electricians | Shandon · San Luis Obispo County | — | — |
| J J David Construction | Jebediah James David | — | (805) 748 3503 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| J J Development Co | James Jerome Bednar | — | (805) 341 6680 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| J J Fisher Construction INC | Jayson James Fisher | — | (805) 723 5220 | Other | Nipomo · San Luis Obispo County | — | — |
| J J Leon Construction INC | Johnny Joseph Leon | johnny@jjleonconstruction.com | (805) 489 8925 | Other roofers | Grover Beach · San Luis Obispo County | — | — |
| J J Wills Construction INC | Joshua John Wills | josh@jjwillsconstruction.com | (805) 423 1871 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| J K Ames Construction | Joseph Kevin Ames | — | (805) 235 5171 | GC, remodel, ADU | Santa Margarita · San Luis Obispo County | — | — |
| J L Fasulo Drywall | J L Fasulo Drywall | — | (805) 441 5646 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| J L Peterson | J L Peterson | — | (805) 481 2345 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| J L R Flooring | J L R Flooring | jlrfloorandwall@gmail.com | (805) 458 9646 | Other | Oceano · San Luis Obispo County | — | — |
| J L S Construction & Home Repair INC | Johnny Lee Skaggs | — | (805) 801 3678 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| J L S Flooring | J L S Flooring | — | (805) 888 1552 | Other | Paso Robles · San Luis Obispo County | — | — |
| J Lovato Property Maintenance | J Lovato Property Maintenance | — | (805) 440 9730 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| J M C S Construction Co INC | Shari Doss-Teixeir Luis | — | (805) 305 0645 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| J M Howell INC | James Morgan Howell | — | (805) 423 5479 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| J M Wilson Development Corp | John Michael Wilson | — | (805) 441 4873 | GC, remodel, ADU | Avila Beach · San Luis Obispo County | — | — |
| J Moore Construction Company | Joshua Brandon Moore | — | (805) 464 9451 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| J Moore Painting | J Moore Painting | — | (805) 423 5730 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| J Murphy Construction INC | James Nicholas Murphy | contacts@jmurphyconstruction.com | (805) 748 3708 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| J N J Doorz | Jeffery Dean Conover | — | (805) 440 2565 | Other | Paso Robles · San Luis Obispo County | — | — |
| J P Electric | Jesse James Pacheco | — | (559) 733 8313 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |