| 1 Solorio INC | Solorio Alex | — | (714) 578 4709 | GC, remodel, ADU | Orange · Orange County | — | — |
| 168cad Construction INC | Gao Peng | — | (626) 777 7757 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| 1st Action Restoration | 1st Action Restoration | — | (855) 379 9257 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| 1st Affordable Contractor.com | 1st Affordable Contractor.com | — | (714) 931 1776 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| 1st Choice Builders Group INC | Richard Roy Hayden | — | (951) 378 5639 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| 1st Choice Construction Solutions | Sean Franklin Dooley | — | (949) 290 9462 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| 1st Choice Home Improvement | 1st Choice Home Improvement | — | (714) 288 1888 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| 1st Line Construction | Robert Manuel Delgado | — | (949) 632 0170 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| 1st Solution Construction Service | James Joseph Palmeri | — | (888) 988 8337 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| 1st Step Restoration INC | Richard Karl Mccracken | — | (949) 600 8331 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| 2 By 4 Construction Company | Chalabi-hajkarim Kasra | — | (714) 791 6381 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| 2 The Point Construction | Walid Louis Makhlouf | — | (714) 305 9894 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| 22 Builders Co | Luis Reynaldo Pacheco | — | (562) 547 3409 | GC, remodel, ADU | La Habra · Orange County | — | — |
| 24 Hour Bath Enterprises INC | Daniel Guy Liechty | — | (949) 263 0779 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| 24 Hour Restoration & Construction | Bobby Mahmud Ameen | — | (949) 407 6800 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| 2by4 Construction & Remodeling INC | Amirabbas Anvari | — | (714) 552 0949 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| 2E Design & Development | 2E Design & Development | — | (949) 439 8260 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| 2vm Socal Construction | Victor Manuel Martinez | 2vmhome@2vmsocalconstruction.com | (562) 355 0602 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| 2x4 Renovation & Remodel | Garcia Fernando Diaz | — | (714) 955 3587 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| 3 Brothers Construction Services | Abelardo Ivan Valenzuela-Cardenas | interested@domainmarket.com | (949) 510 2834 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| 3 S Network INC | Gholam Hossein Taghipoor | — | (949) 916 4561 | GC, remodel, ADU | Tustin · Orange County | — | — |
| 3-d Construction Services INC | Robert Camargo | — | (714) 488 8700 | GC, remodel, ADU | Orange · Orange County | — | — |
| 320 Grit INC | Brett Tyler Smith | — | (844) 320 4748 | GC, remodel, ADU | Irvine · Orange County | — | — |
| 360 Construction Group INC | Russell Heath Cheverton | — | (310) 567 0348 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| 3gm Construction | Miranda-duran Gerardo | enquiry@3gmconstruction.com | (949) 813 7620 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| 3J Company | James Joseph Ongaro | — | (951) 588 7277 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| 3J Construction LLC | Joseph Adel Zaky | impallari@gmail.com | (714) 402 7550 | GC, remodel, ADU | La Habra · Orange County | — | — |
| 3jc Construction INC DBA Oc Flooring | Byung Kil Kim | — | (909) 896 8467 | GC, remodel, ADU | Irvine · Orange County | — | — |
| 3lite Construction INC | Uriel A Rodriguez Silva | — | (714) 200 7530 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| 3M Construction Corporation | Mahmoud Anis Merzi | — | (949) 898 9595 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| 4:13 Gc Services | Michael Shawn Johnson | — | (714) 450 2367 | GC, remodel, ADU | Orange · Orange County | — | — |
| 4U Global Construction | Abdalrahman Abdalhaq | — | (714) 696 2314 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| 5 M Contracting,inc. | Ronald Ray Mc Daniel | — | (714) 730 6760 | GC, remodel, ADU | Tustin · Orange County | — | — |
| 5 Star Gc INC | Peter Kim | — | (714) 794 9404 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| 5 Star Improvement And Repair Services | Sadeghian Arash | — | (951) 236 8804 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| 55 Flooring Tile & Stone Ebrahim Ezzati | Ezzati Ebrahim | — | (714) 300 0700 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| 5G Builder | 5G Builder | — | (562) 233 1111 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| 5gold Construction INC | Yuanyuan Xiao Estrada | — | (828) 655 6789 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| 689 Construction Master | Antwoine Demetrius Turner | — | (714) 293 0393 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| 7 Millenium Construction & Services | Chavero Edgar | — | (949) 836 1679 | GC, remodel, ADU | Santa Ana · Orange County | — | — |