| 5 Alarm Fire Corporation | Bernadette Rae Merrill | — | (714) 632 8646 | Electricians | Orange · 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 | — | — |
| 5 Stars Flooring Installers INC | Albino Jose Garcia | — | (562) 612 8013 | Other | Cypress · Orange County | — | — |
| 502 Concrete INC | Elvis Udeni Navarro Paz | — | (949) 278 1254 | Other | Mission Viejo · Orange County | — | — |
| 548 Group INC | Timothy Perry Free | — | (949) 861 1881 | Other | San Clemente · Orange County | — | — |
| 55 Flooring Tile & Stone Ebrahim Ezzati | Ezzati Ebrahim | — | (714) 300 0700 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| 55 Property Services INC | Roman Henry Nunez | — | (866) 586 2626 | Other roofers | Fullerton · Orange County | — | — |
| 57 Heating And Air Conditioning | 57 Heating And Air Conditioning | — | (323) 479 3048 | HVAC | Fullerton · 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 | — | — |
| 6A Audio Video | Chance Kent Longworth | — | (714) 345 8107 | Other | Fountain Valley · Orange County | — | — |
| 7 Electrical Contractor | Matthew Mark Perez | — | (714) 331 8399 | Electricians | Garden Grove · Orange County | — | — |
| 7 Millenium Construction & Services | Chavero Edgar | — | (949) 836 1679 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| 7 Millennium Construction & Services INC | Edgar Chavero | — | (714) 818 6987 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| 7 Planning Construction And Development INC | Adan Madrid | — | (714) 519 3399 | GC, remodel, ADU | La Habra · Orange County | — | — |
| 7's Tear Off Roofing INC | Sergio Ramos | — | (714) 331 9052 | Other roofers | La Habra · Orange County | — | — |
| 714 Concrete Services INC | Jeffrey Dean Mc Clard | — | (714) 646 9816 | Other | Placentia · Orange County | — | — |
| 714 Garage Doors | 714 Garage Doors | — | (714) 815 5688 | Other | Yorba Linda · Orange County | — | — |
| 714 Landscaping LLC | Gabriel Joseph Terrones | — | (714) 317 0357 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| 714 Plumbing INC | Edgar Joevany Estrada | — | (714) 362 7948 | Other | Anaheim · Orange County | — | — |
| 75 Electric INC | Alonso Rivas | — | (562) 844 2654 | Electricians | Los Alamitos · Orange County | — | — |
| 77 Construction Group INC | Ariou Hooshmand | — | (949) 278 2219 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| 770 Local Garage Door & Gate INC | Richard Jr Santillan | — | (714) 600 1664 | Other | Santa Ana · Orange County | — | — |
| 7designs + Development | 7designs + Development | — | (714) 724 1902 | GC, remodel, ADU | Irvine · Orange County | — | — |
| 8 Plumbing | 8 Plumbing | — | (714) 860 0234 | Other | Garden Grove · Orange County | — | — |
| 8pt Electrical Services INC | David Michael Scott | — | (562) 510 0110 | Electricians | Seal Beach · Orange County | — | — |
| 911 Drain Lines And Plumbing | Christopher James Cline | — | (562) 810 1965 | HVAC | Orange · Orange County | — | — |
| 911 Restoration Of Orange County | Waldman Doron | — | (949) 502 0002 | GC, remodel, ADU | Orange · Orange County | — | — |
| 911 Restoration Of Socal | Doron Waldman | — | (562) 335 5965 | GC, remodel, ADU | Orange · Orange County | — | — |
| A & A Pool Services | Kim Dong Bok | — | (714) 351 0532 | Pool | Buena Park · Orange County | — | — |
| A & A Refrigeration | A & A Refrigeration | interested@domainmarket.com | (714) 541 8988 | HVAC | Santa Ana · Orange County | — | — |
| A & A Stone Works INC | Houman Mike Ala'i | — | (714) 602 1011 | Other | Santa Ana · Orange County | — | — |
| A & A's Construction INC | Eric Sanchez Vega | — | (714) 270 7574 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A & B Concrete Service INC | Bryan Maynard Weber | — | (714) 393 2256 | Other | Yorba Linda · Orange County | — | — |
| A & B Construction INC | Aiman Ourabi Berouti | — | (949) 830 1103 | GC, remodel, ADU | Irvine · Orange County | — | — |
| A & B Heating And Air Conditioning | Brian Jeffrey Lenhart | — | (424) 328 0695 | HVAC | Westminster · Orange County | — | — |
| A & B Home Remodeling & Design INC | Ali Ghominejad | — | (951) 427 0987 | GC, remodel, ADU | Irvine · Orange County | — | — |