| 4 Brother's Sheet Metal INC | Isayan Vardan | — | (818) 468 2060 | Other | Glendale · Los Angeles County | — | — |
| 4 Brothers Drywall INC | Candelario Larios | — | (619) 642 1941 | Other | Ramona · San Diego County | — | — |
| 4 C Development | 4 C Development | — | (562) 355 2245 | GC, remodel, ADU | Long Beach · Los Angeles County | — | — |
| 4 Cals Concrete Pumping | 4 Cals Concrete Pumping | — | (916) 548 3283 | Other | Roseville · Placer County | — | — |
| 4 Clover Landscaping | 4 Clover Landscaping | — | (949) 201 8199 | Windows, patio, painters | Trabuco Canyon · Orange County | — | — |
| 4 Com Incorporated | Francisco Cruz Paz | — | (951) 742 8006 | Other | Riverside · Riverside County | — | — |
| 4 Corners Construction And Remodeling | Glen Harlen Thomas | — | (916) 912 0923 | GC, remodel, ADU | North Highlands · Sacramento County | — | — |
| 4 Corners Flooring | Khatchig Archie Titizian | — | (818) 612 2575 | GC, remodel, ADU | Granada Hills · Los Angeles County | — | — |
| 4 Corners Flooring INC | Jurasek Srecko | — | (408) 781 8718 | Other | Campbell · Santa Clara County | — | — |
| 4 Corners INC | Ronald Arthur Johnson | — | (818) 855 6722 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| 4 Craftsmen Construction INC | Michael Stanton Riter | — | (925) 245 8900 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| 4 D Industries INC | Brian Peter Dongelmans | info@d-industries.com | (209) 745 0500 | HVAC | Galt · Sacramento County | — | — |
| 4 Diamond Construction INC | Vincent Mario Franco | todd@diamond-construction.com | (513) 519-7766 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| 4 Duces Painting | 4 Duces Painting | — | (805) 286 0864 | Windows, patio, painters | Porterville · Tulare County | — | — |
| 4 G Heating & Air | 4 G Heating & Air | — | (209) 594 5392 | HVAC | Manteca · San Joaquin County | — | — |
| 4 Granite INC | Joe Webb | — | (760) 403 3376 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| 4 Guys Remodeling INC | Lugo Alejandro Alamilla | — | (925) 785 4216 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| 4 J Construction | Jesse Derwin Simeroth | — | (760) 533 0586 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 4 J Drywall Corp | Retana Hugo Sanchez | — | (909) 539 8108 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| 4 J Sectional Doors | 4 J Sectional Doors | — | (925) 383 8428 | Other | Ripon · San Joaquin County | — | — |
| 4 J's Plumbing And Drain Cleaning | Jeremy Edward Duncan | — | (805) 302 9564 | Other | Oxnard · Ventura County | — | — |
| 4 Jay's Construction Services INC | Jesus Andres Ordaz Estala | — | (619) 576 1279 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| 4 K Construction | Eliseo Castro Jr Garcia | — | (707) 704 9860 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| 4 Kings Construction Site Services | Alberto Zaragoza | — | (323) 559 4945 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| 4 L & L INC DBA The Outside Edge | Carolyn Joy Corwin | — | (805) 277 9638 | Windows, patio, painters | Newbury Park · Ventura County | — | — |
| 4 Lakes Landscape | Obregon Pedro Valdez | — | (626) 202 3211 | Windows, patio, painters | South El Monte · Los Angeles County | — | — |
| 4 Less Plumbing | 4 Less Plumbing | — | (661) 742 0300 | Other | Bakersfield · Kern County | — | — |
| 4 Link Electric | Hany Reyad Metry | — | (310) 210 6524 | Electricians | Santa Clarita · Los Angeles County | — | — |
| 4 Long Term Construction | Nieves Reyes Longino | — | (831) 840 4293 | GC, remodel, ADU | Watsonville · Santa Cruz County | — | — |
| 4 M Mechanical INC | Michael Anthony Foutch | — | (619) 944 4822 | HVAC | San Diego · San Diego County | — | — |
| 4 N B Construction | Mark Anthony Hernandez | — | (909) 643 6654 | GC, remodel, ADU | Pomona · Los Angeles County | — | — |
| 4 Nu Construction | Larry Marven Grigsby | — | (310) 344 8989 | GC, remodel, ADU | Beverly Hills · Los Angeles County | — | — |
| 4 Over Electric INC | Tarverdians Ara | — | (818) 437 4515 | Electricians | Glendale · Los Angeles County | — | — |
| 4 Pals INC | Gary Knox Powell | — | (714) 375 1227 | Other | Huntington Beach · Orange County | — | — |
| 4 Point Contracting INC | Jazzet Husai Castellanos Morales | — | (951) 254 8494 | GC, remodel, ADU | Corona · Riverside County | — | — |
| 4 Point Contractors INC | Kelli Catherine Boles | — | (661) 978 7016 | GC, remodel, ADU | Bakersfield · Kern County | — | — |
| 4 Point Electric | Louis Vincent Herrera | — | (408) 331 7617 | Electricians | Milpitas · Santa Clara County | — | — |
| 4 Point Plumbing | 4 Point Plumbing | — | (760) 920 4123 | Other | Bishop · Inyo County | — | — |
| 4 Points A/c And Heating | Abelar Lopez Martin | — | (909) 280 3318 | HVAC | San Bernardino · San Bernardino County | — | — |
| 4 Real Construction INC | Edward John Tallman | — | (510) 773 4490 | GC, remodel, ADU | Hayward · Alameda County | — | — |