| Alex Goodwin | Alex Goodwin | — | (707) 421 9658 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Alexander Builder | Alexander Builder | — | (707) 334 2225 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Alfa Construction | Zepeda German | — | (707) 373 2546 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Alfaros And Son Roofing LLC - Shingle Roof Installation And Repair | Alfaros And Son Roofing LLC - Shingle Roof Installation And Repair | — | (619) 871-2954 | Other roofers | El Cajon · Solano County | — | — |
| Alfred Conhagen INC Of California | Michael Phillip Petrellese | — | (707) 746 4848 | Other | Benicia · Solano County | — | — |
| Alfredo's Roofing | Alfredo's Roofing | — | (760) 473-2667 | Other roofers | Escondido · Solano County | — | — |
| All About Asphalt | All About Asphalt | interested@domainmarket.com | (916) 899 0229 | Other | Dixon · Solano County | — | — |
| All Access Painting Incorporated | Steven Joseph Iv Tomsic | — | (707) 688 3735 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| All American Concrete | All American Concrete | — | (707) 974 0127 | Other | Fairfield · Solano County | — | — |
| All American Elevator Company INC | Nicholas Leonard Piano | — | (877) 653 5123 | Other | Benicia · Solano County | — | — |
| All American Paving | All American Paving | — | (844) 572 8348 | Other | Vacaville · Solano County | — | — |
| All American Paving | All American Paving | — | (408) 280 1530 | Other | Dixon · Solano County | — | — |
| All Cities Elevator LLC | Cedric Chan | info@allcitieselevator.com | (774) 274 2562 | Other | Vacaville · Solano County | — | — |
| All City Finest Plumbing | Edwin Jose Garcia | — | (415) 424 5359 | Other | Vacaville · Solano County | — | — |
| All County Flooring | Terry Eugene Carroll | sales@allcountyflooring.com | (707) 205 4229 | Other | Benicia · Solano County | — | — |
| All J's Electric | Juan Carmen Carapia | — | (209) 430 3255 | Electricians | Fairfield · Solano County | — | — |
| All N' All Roofing | Robert James Burnett | bobburnett777@gmail.com | (925) 250 9531 | Other roofers | Benicia · Solano County | — | — |
| All Phase Construction | Lindsey Jeff | — | (707) 249 2918 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| All Plumbing | All Plumbing | — | (707) 332 1939 | Other | Vallejo · Solano County | — | — |
| All Pro Construction | Mitchell Leon Abila | — | (707) 421 1514 | GC, remodel, ADU | Suisun City · Solano County | — | — |
| All Season Landscaping | All Season Landscaping | — | (707) 688 4024 | Windows, patio, painters | Fairfield · Solano County | — | — |
| All Seasons Roofing | Perez Vanessa | — | (707) 552 4101 | Other roofers | Vallejo · Solano County | — | — |
| All Size | Charles Wade Saavedra | — | (707) 448 3300 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| All Size Home Remodeling | Anderson Vaz Fernandes | — | (925) 497 1620 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| All Star A/c & Heating Ngov | Henry Hai Ngov | — | (707) 384 2775 | HVAC | Fairfield · Solano County | — | — |
| All Star Fire Protection LLC | Farhad Zebarjadi | — | (415) 596 0410 | Other | Vallejo · Solano County | — | — |
| All Star Plumbing | Toan Chu Nguyen | — | (707) 689 3338 | Other | Fairfield · Solano County | — | — |
| All Trades & Design INC DBA J F Mechanical 3:23 | James Harl Fitchhorn | — | (707) 372 8748 | HVAC | Vacaville · Solano County | — | — |
| All Valley Paving | All Valley Paving | — | (707) 449 1512 | Other | Vacaville · Solano County | — | — |
| All Weather Heating & Air Conditioning INC | Gilbert Richard Jr Medrano | — | (707) 447 9855 | HVAC | Vacaville · Solano County | — | — |
| Allan Michael Ballard | Allan Michael Ballard | — | (925) 788 9061 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Allbay Roofing | Escalante Bernardino | allbayroofing@verizon.net | (707) 333 7252 | Other roofers | Vallejo · Solano County | — | — |
| Alliance Real Estate Inspections | Alliance Real Estate Inspections | — | (818) 353-2885 | Inspectors | Sunland · Solano County | — | — |
| Allied Builders Pro INC | Dennis Patrick Selby | — | (707) 514 7672 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Allied Framers LLC | Jesse A Carter | info@alliedframers.com | (707) 452 7050 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Allsafe Fire Protection | Allsafe Fire Protection | — | (707) 446 5300 | Other | Vacaville · Solano County | — | — |
| Allsizes Construction INC | Jose Dejesus Martinez Ramirez | — | (510) 695 4682 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Allstate Scaffolding INC | Rudy Mendez Guzman | — | (707) 422 2331 | Other | Fairfield · Solano County | — | — |
| Allstate Victor Corp | Victor Jaime Gonzalez | — | (925) 212 0395 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Alonso's Lawncare LLC | Edgardo Alonso | — | (707) 455 7255 | Windows, patio, painters | Vacaville · Solano County | — | — |