| Jimmy Roofing Contractor Slo | Jimmy Roofing Contractor Slo | — | (805) 221-4799 | Other roofers | San Luis Obispo · San Luis Obispo County | — | — |
| Jj Building | Jj Building | — | (805) 627 2098 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Jm Builders | Jm Builders | — | (805) 377 2018 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Jm Construction | Mark Kenneth Marshall | info@jmconstruction.com | (805) 472 2400 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Jm Plumbing | Lisa Maria Malkin | — | (805) 748 3290 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Jmm Construction Solutions | Joseph Michael Mariscal | — | (805) 406 3774 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| Jne Concrete INC | Edward Alexander Williams | quote@concreteslo.com | (805) 668 2059 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Joe Cameron Construction | Joseph Justin Cameron | — | (805) 440 2233 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Joe Davis Plumbing | Joe Davis Plumbing | — | (805) 792 2233 | Other | Templeton · San Luis Obispo County | — | — |
| Joe De La Rosa Electric | De La Rosa Joe | — | (661) 203 6327 | Electricians | Grover Beach · San Luis Obispo County | — | — |
| Joe Mc Alexander Electric | Marvin Joe Mc Alexander | — | (805) 481 7990 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Joe Rayle Drywall | Joe Rayle Drywall | — | (805) 801 6686 | Other | Cambria · San Luis Obispo County | — | — |
| Joel Bishop Construction | Joel Christian Bishop | — | (805) 748 4079 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Joel G Martinez | Joel G Martinez | — | (805) 704 2601 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Joel Garcia DBA Garcia Bros Construction | Garcia Joel | — | (805) 235 1103 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Joel Timothy Davis | Joel Timothy Davis | — | (415) 260 5414 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| John A Dollinger | John A Dollinger | — | (805) 471 3685 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| John Birk | John Birk | — | (818) 424 3031 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| John C Aldridge | John C Aldridge | — | (408) 726 1452 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| John Construction | Michael Anthony John | — | (805) 461 0458 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| John Dallaire Excavating | John Dallaire Excavating | — | (805) 466 0300 | Other | Atascadero · San Luis Obispo County | — | — |
| John Dekorte Construction | William John Dekorte | — | (805) 400 5276 | GC, remodel, ADU | Creston · San Luis Obispo County | — | — |
| John Diercks Marble & Tile | John Diercks Marble & Tile | — | (805) 712 0992 | Other | Atascadero · San Luis Obispo County | — | — |
| John Dittenhoefer | John Dittenhoefer | — | (805) 305 0645 | HVAC | Nipomo · San Luis Obispo County | — | — |
| John Elwood Masonry | John Elwood Masonry | — | (805) 466 2869 | Other | Atascadero · San Luis Obispo County | — | — |
| John Godfrey Construction | John Daniel Godfrey | — | (805) 471 5496 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| John Hendry Construction | John William Hendry | — | (805) 441 2287 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| John Heystee Construction | John Lawrence Heystee | — | (805) 748 1679 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| John Hogan Construction | John Joseph Hogan | — | (925) 357 1343 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| John J Corr | John J Corr | — | (661) 373 6107 | GC, remodel, ADU | Shell Beach · San Luis Obispo County | — | — |
| John Joseph O'brien | John Joseph O'brien | — | (805) 466 3148 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| John L Balderson Protective Coatings | John L Balderson Protective Coatings | — | (805) 543 2280 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| John L Jensen Painting | John L Jensen Painting | — | (805) 458 6297 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| John Madonna Construction Company INC | John Paul Madonna | — | (805) 543 7751 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| John Marta Construction | John Steven Marta | — | (805) 556 5400 | Other | Los Osos · San Luis Obispo County | — | — |
| John Mc Kently | John Mc Kently | — | (818) 247 3209 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| John Patterson Construction | John Slatin Patterson | — | (805) 423 3783 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| John R Kilpelainen | John R Kilpelainen | — | (805) 440 4033 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| John Rodney Stafford Construction | John Rodney Stafford | — | (805) 466 8667 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| John Scott Graham | John Scott Graham | — | (805) 400 8143 | Electricians | Paso Robles · San Luis Obispo County | — | — |