| 4th Dimension Painting | 4th Dimension Painting | — | (209) 496 7422 | Windows, patio, painters | Santa Clara · Santa Clara County | — | — |
| 4th Gen Flooring | 4th Gen Flooring | — | (530) 598 5817 | Other | Yreka · Siskiyou County | — | — |
| 4th Gen Painting | 4th Gen Painting | — | (661) 809 4012 | Windows, patio, painters | Bakersfield · Kern County | — | — |
| 4th Gen Remodeling | Lawrence Anthony Jr Gomez | — | (916) 996 4141 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |
| 4th Generation Tree | Morgan Clay Scovell | — | (805) 462 2020 | Tree | Templeton · San Luis Obispo County | — | — |
| 4th Generation Tree | Morgan Clay Scovell | — | (805) 462 2020 | Windows, patio, painters | Templeton · San Luis Obispo County | — | — |
| 4U Global Construction | Abdalrahman Abdalhaq | — | (714) 696 2314 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| 4wall Entertainment INC | William Warren Pursell | — | (916) 652 8575 | Electricians | West Sacramento · Yolo County | — | — |
| 5 - Star Construction | Petru G Verhovetchi | — | (916) 800 5555 | Other | North Highlands · Sacramento County | — | — |
| 5 - Star Construction | Cesar Arturo Perdomo | — | (213) 591 1174 | GC, remodel, ADU | Lancaster · Los Angeles County | — | — |
| 5 - Star Interior Services INC | Ginger Chapin Chrupcala | — | (818) 845 4518 | Other | Paramount · Los Angeles County | — | — |
| 5 Alarm Fire Corporation | Bernadette Rae Merrill | — | (714) 632 8646 | Electricians | Orange · Orange County | — | — |
| 5 Brother's Painting & General Construction INC | Rafael Perez | — | (909) 648 0408 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| 5 Brothers Best Construction INC | Gonzalo Quiroz | — | (408) 859 2320 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| 5 C Holdings INC | Cami Nichole Hogg | — | (661) 438 8392 | Other | Bakersfield · Kern County | — | — |
| 5 C's Landscaping INC | Elias Monge Torres | — | (661) 345 9562 | Windows, patio, painters | Tehachapi · Kern County | — | — |
| 5 Cities Builders INC | Joel Bradley Smith | — | (805) 809 3444 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| 5 H Garage Doors INC | Mahmoud Mike Ghais | — | (310) 567 2123 | Other | Torrance · Los Angeles County | — | — |
| 5 In 1 Construction INC | Victor Manuel Carrasco | guy@infinitydesignbuild.com | (619) 874 0406 | GC, remodel, ADU | San Ysidro · San Diego County | — | — |
| 5 M Contracting,inc. | Ronald Ray Mc Daniel | — | (714) 730 6760 | GC, remodel, ADU | Tustin · Orange County | — | — |
| 5 North Media | Robert Thomas Jr Bobuk | — | (858) 621 2155 | Other | San Diego · San Diego County | — | — |
| 5 Olague Construction INC | Marco Antonio Olague-Rivera | — | (619) 372 3105 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 5 Points Sash & Doors | Robert Fernando Acuna | — | (310) 326 4141 | GC, remodel, ADU | Torrance · Los Angeles County | — | — |
| 5 Rivers Construction | Amit Kumar Sharma | arielle.pennington@riversconstruction.com | (530) 519 7227 | GC, remodel, ADU | Rancho Cordova · Sacramento County | — | — |
| 5 Rivers Contractors | Gursher Singh Bajwa | — | (516) 757 1831 | GC, remodel, ADU | Bakersfield · Kern County | — | — |
| 5 S Contracting INC DBA Landmark Mechanical | Gary Ray Seelinger | — | (858) 279 1222 | HVAC | San Diego · San Diego County | — | — |
| 5 Star Best Plumbing | Raymond Earl Jackson | — | (855) 999 4417 | HVAC | Newhall · Los Angeles County | — | — |
| 5 Star Builder | 5 Star Builder | — | (949) 678 0763 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| 5 Star Builders INC | Kayumba Kanama | — | (818) 687 3113 | Electricians | West Hills · Los Angeles County | — | — |
| 5 Star Building Maintenance LLC | Jace Deron Mcbee | — | (650) 533 4595 | Other | San Bruno · San Mateo County | — | — |
| 5 Star Construction | Jose Alfredo Sr Rosales | — | (213) 273 4454 | GC, remodel, ADU | Gardena · Los Angeles County | — | — |
| 5 Star Construction | Bryan Lee Davis | — | (209) 518 6139 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| 5 Star Construction And Remodeling INC | Juan Francisco Sanchez Campos | — | (562) 833 4088 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| 5 Star Construction INC | Munguia Jose | — | (214) 475 2664 | Other roofers | Woodland Hills · Los Angeles County | — | — |
| 5 Star Construction Pros | George Lanning | — | (310) 439 0316 | GC, remodel, ADU | Studio City · Los Angeles County | — | — |
| 5 Star Drywall Services | Hernandez Hugo Ruiz | — | (424) 394 7549 | Other | Inglewood · Los Angeles County | — | — |
| 5 Star Electric | Edwin Narciso Merino | — | (323) 377 8228 | Electricians | Los Angeles · Los Angeles County | — | — |
| 5 Star Electrical Services INC | Bruce John Singh | clayton@starelectricalservices.com | (805) 215 4503 | Electricians | Los Osos · San Luis Obispo County | — | — |
| 5 Star Flooring INC | Dustin Lee Garrett | — | (951) 616 9373 | Other | Canyon Lake · Riverside County | — | — |
| 5 Star Gc INC | Peter Kim | — | (714) 794 9404 | GC, remodel, ADU | Buena Park · Orange County | — | — |