| Apex Plumbing | Christian Blaine Rohland | — | (760) 660 5945 | Other | Morongo Valley · San Bernardino County | — | — |
| Apex Tree Care Professionals | Armando Davalos | — | (323) 314 2936 | Tree | San Bernardino · San Bernardino County | — | — |
| Apex Walls Builders INC | Renato Andre Alva Flores | — | (323) 212 6233 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Apex-flooring Co | Torres Edilberto Morales | — | (626) 235 7238 | Other | Adelanto · San Bernardino County | — | — |
| Apexguard Construction | Yaguang He | — | (626) 692 3568 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Aplus Painting LLC | Luis Manuel Montelongo | — | (909) 449 9001 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| Aplus Water Damage Restoration | Aplus Water Damage Restoration | — | (909) 504-4099 | Restoration | San Bernardino · San Bernardino County | — | — |
| Apollo Wood Recovery INC | Shawn Arlen Nutter | — | (909) 371 9510 | Other | Chino · San Bernardino County | — | — |
| Apple Construction | Pedro Andres Rivas | — | (909) 997 0881 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Apple Home Repairs & Construction | Miguel Israel Ruiz Gonzalez | — | (760) 956 0129 | GC, remodel, ADU | Lucerne Valley · San Bernardino County | — | — |
| Apple Valley Garage Door | Apple Valley Garage Door | info@avgaragedoorservice.com | (952) 208-9729 | Other | Apple Valley · San Bernardino County | — | — |
| Apple Valley Glass INC | Daniel Scott Silveroli | info@applevalleyglass.com | (760) 247 8003 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| Applegate's Custom Countertops INC | Lyle David Applegate | applegatestops@yahoo.com | (760) 694 5507 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Applied Urethane Systems INC | Nathan Paul Hughes | — | (909) 422 0800 | Other roofers | Colton · San Bernardino County | — | — |
| Approved Air Conditioning And Heating | Approved Air Conditioning And Heating | — | (909) 393 0182 | HVAC | Chino Hills · San Bernardino County | — | — |
| April Air | April Air | — | (760) 949 1995 | HVAC | Hesperia · San Bernardino County | — | — |
| Aq Reinforcing Steel | Alejandro Quiahua-Anselmo | — | (442) 417 3828 | Other | Barstow · San Bernardino County | — | — |
| Aqs Mechanical INC | Ruben Flores | info@aqsmechanical.com | (951) 966 2499 | HVAC | Colton · San Bernardino County | — | — |
| Aqua Fence | Aqua Fence | — | (909) 800 6412 | Other | Redlands · San Bernardino County | — | — |
| Aqua Investments | Aqua Investments | — | (909) 625 1125 | Other | Montclair · San Bernardino County | — | — |
| Aqua Reflections Custom Pools | Aqua Reflections Custom Pools | — | (909) 557 3755 | Pool | Yucaipa · San Bernardino County | — | — |
| Aqua-q INC | In Sung Lee | — | (909) 591 0802 | Other | Chino Hills · San Bernardino County | — | — |
| Aqua-serv Engineers INC | Geoffrey Karl Leader | — | (951) 727 4429 | Other | Fontana · San Bernardino County | — | — |
| Aquadry Plumbing And Restoration INC | Ted Michael Bisceglia | — | (909) 380 4494 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Aquamarine Pool Construction | Hernandez Andy | — | (760) 713 9004 | Pool | Oak Hills · San Bernardino County | — | — |
| Aquarius Plumbing | Aquarius Plumbing | — | (909) 721 7041 | Other | Alta Loma · San Bernardino County | — | — |
| Aquatic Horizon Pools & Spas | Oscar Orozco | — | (626) 367 6571 | Pool | Fontana · San Bernardino County | — | — |
| Aquatic Luxuries Pools | Aquatic Luxuries Pools | — | (442) 230 7065 | Pool | Hesperia · San Bernardino County | — | — |
| Ar & Sons | Luis Alberto Jr Garcia | — | (909) 670 6829 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Ar Cabinets Countertops INC | Jose Alberto Rivera Garcia | — | (909) 815 7852 | Other | Fontana · San Bernardino County | — | — |
| Ar Cooling And Heating LLC | Ramirez Cardenas Adrian | — | (909) 953 5661 | HVAC | Bloomington · San Bernardino County | — | — |
| Aragon Construction INC | Joseph Ernest Aragon | info@aragonconstruction.com | (909) 621 2200 | GC, remodel, ADU | Montclair · San Bernardino County | — | — |
| Aragon HVAC | Aragon HVAC | — | (760) 406 3049 | HVAC | Apple Valley · San Bernardino County | — | — |
| Aragon Landscape And Maintenance | Aragon Landscape And Maintenance | — | (760) 694 2004 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| Arana Roofing Corp DBA Arana Roofing | Arana Carlos | — | (323) 376 0624 | Other roofers | Fontana · San Bernardino County | — | — |
| Aranda's Sanitation Systems | Joseph Rudy Aranda | — | (909) 721 5006 | Other | Ontario · San Bernardino County | — | — |
| Arandas General Contractor | Norberto Octavio Aranda | — | (760) 605 5974 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| Arbat Construction INC | Jaswinder Singh Toor | — | (909) 224 5465 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Arborpro | Michael Phillip Murphy | — | (760) 275 4660 | Windows, patio, painters | Yucca Valley · San Bernardino County | — | — |
| Arc Electrical Contractors INC | Haq Mujahid Ul | — | (909) 516 8696 | Electricians | Ontario · San Bernardino County | — | — |