| Adapt & Design Construction | Abel Acosta | — | (310) 290 2070 | GC, remodel, ADU | Downey · Los Angeles County | — | — |
| Adapt Dwellings INC | Steven Micah Edrington | — | (510) 749 4880 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Adapt Heating & AC | Adapt Heating & AC | — | (559) 360 6614 | HVAC | Fresno · Fresno County | — | — |
| Adapt Plumbing | Adapt Plumbing | adaptplumbing21@yahoo.com | (209) 922 3706 | Other | Manteca · San Joaquin County | — | — |
| Adaptive Controls Services | Alberto Andres Perez | — | (909) 851 2364 | HVAC | Ontario · San Bernardino County | — | — |
| Adaptive Home Hardening LLC | Kenneth Louis Jr Bagwell | nigel@adaptivehomehardening.com | (775) 762 9328 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Adaptive Networks LLC | Joel David Gutierrez | — | (650) 345 8000 | Other | Millbrae · San Mateo County | — | — |
| Adaptive Plumbing INC | Sergio Adan Avila | — | (714) 489 3205 | Other | Whittier · Los Angeles County | — | — |
| Adaptive Power Company INC | Scott Alan Curaba | — | (626) 324 0057 | Electricians | Glendora · Los Angeles County | — | — |
| Adaptive Systems INC | Christopher Daniel Smith | — | (408) 206 2875 | Other | Morgan Hill · Santa Clara County | — | — |
| Adar Builders INC | Amit Adar | office@adarbuilders.com | (818) 938 3260 | Other roofers | Winnetka · Los Angeles County | — | — |
| Adar Electric Corporation | Daryoush Ostad Asadollahi | — | (619) 846 0085 | Electricians | San Diego · San Diego County | — | — |
| Adar Homes | Haiem Orit | — | (310) 999 2999 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Adara Landscapes INC | Valdivia Martin Gonzalez | — | (408) 775 9160 | Windows, patio, painters | Mountain View · Santa Clara County | — | — |
| Adary Electric INC | Nadav Adary | — | (650) 577 1100 | Electricians | Foster City · San Mateo County | — | — |
| Adato Roofing | Robert Isaac Adato | — | (818) 203 8228 | Other roofers | Stevenson Ranch · Los Angeles County | — | — |
| Adatto Security + Communications DBA Fremont Alarm | Fremont Alarm | — | (510) 576 7099 | Electricians | Fremont · Alameda County | — | — |
| Adavco INC | Harry Arthur Davis | postbox@adavco.de | (661) 327 0067 | GC, remodel, ADU | Bakersfield · Kern County | — | — |
| Adaza Electric INC | Wright Charles Adaza | — | (310) 634 9901 | Electricians | Redondo Beach · Los Angeles County | — | — |
| Adb Construction Group | Alan| Alavizade H Yazd Sayedali Alavi | — | (714) 714 7070 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Adb Electric INC | Armando Daniel Banuelos Soria | — | (714) 310 3717 | Electricians | Orange · Orange County | — | — |
| Adb Enterprise | Angel Leduann Anderson | — | (323) 243 7795 | GC, remodel, ADU | Long Beach · Los Angeles County | — | — |
| Adbz Construction | Zamhir Osman Davila | — | (818) 418 9120 | Electricians | North Hollywood · Los Angeles County | — | — |
| Adc | Anthony Daniel Iii Coiro | — | (951) 204 4134 | Other | Riverside · Riverside County | — | — |
| Adc Construction Company | Yong Chao Kuang | — | (213) 880 9659 | GC, remodel, ADU | Temple City · Los Angeles County | — | — |
| Adc Corp | Daniel Lee Stradford | — | (323) 704 6674 | GC, remodel, ADU | Altadena · Los Angeles County | — | — |
| Adc Installation | Adc Installation | — | (916) 835 4207 | Other | Citrus Heights · Sacramento County | — | — |
| Adc Management INC | Deborah Berta Harris | — | (323) 577 3138 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Adco Drywall And Metal Framing INC | Santiago Gabriel Monestier | — | (916) 631 7010 | GC, remodel, ADU | Gold River · Sacramento County | — | — |
| Adco Roofing And Waterproofing | Dmitri Jacob Triphon | — | (818) 505 9272 | Other roofers | North Hollywood · Los Angeles County | — | — |
| Adco Services INC | Joseph Michael Addante | — | (323) 725 2581 | Windows, patio, painters | Montebello · Los Angeles County | — | — |
| Adco South Roofing And Waterproofing INC | Andrew Jacob Triphon | — | (714) 543 7663 | Other roofers | Orange · Orange County | — | — |
| Adcom Electrical | Pedro Antonio Martinez | — | (619) 386 5132 | Electricians | Chula Vista · San Diego County | — | — |
| Adcon | Mohammad Reza Adib | — | (415) 615 2342 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Add A Garage INC | Kenneth Dean Bloch | info@addagarage.com | (415) 760 9565 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Add A Jack Company | Miller Christopher | — | (916) 747 1520 | Other | Rancho Cordova · Sacramento County | — | — |
| Add Color Painting Corp | Acevedo Victor Benavides | — | (510) 750 9410 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Add Construction | Kenneth Vo | — | (408) 314 0760 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Add New Construction | Peter Allen Bowden | — | (916) 628 0924 | GC, remodel, ADU | Carmichael · Sacramento County | — | — |
| Add Plumbing INC | Clive Adler | — | (818) 760 9418 | Other | San Fernando · Los Angeles County | — | — |