| 21st Century Floors | 21st Century Floors | — | (707) 467 0181 | Other | Ukiah · Mendocino County | — | — |
| 5 Stars Painting INC | Nimrod Jacob Oxtecan | — | (707) 813 2077 | Windows, patio, painters | Fort Bragg · Mendocino County | — | — |
| 5K Builder | 5K Builder | — | (707) 327 7613 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| 707 Construction | Ozzie Blondell Bushway | — | (707) 513 5340 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| 8lct Construction Co | Luong Tai Chi | — | (415) 823 8800 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| A B Construction | Bermudez Garcia Alejandro | — | (707) 813 2737 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| A C & R Service Heating & Cooling INC | Vaughn Alan Mobley | — | (707) 462 2021 | HVAC | Ukiah · Mendocino County | — | — |
| A K Lewis Construction Co | Aaron Lewis Katz | — | (707) 357 5674 | GC, remodel, ADU | Elk · Mendocino County | — | — |
| A N G Construction INC | Arthur Nathaniel George | — | (707) 964 1565 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| A P Guerra Construction | Adrian Perez Guerra | — | (707) 367 8214 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| A R Craftworks | A R Craftworks | — | (925) 200 5068 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| A T W Construction | Andrew Tristan Wattenburger | — | (707) 972 7797 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| A-1 Septic Tank Service | Richard Anthony Ricca | — | (707) 937 0496 | Other | Littleriver · Mendocino County | — | — |
| Aaa Loomins Electric INC | Bradley James Loomis | — | (707) 830-4053 | Electricians | Ukiah · Mendocino County | — | — |
| Aaa Organized Plumbing | Willow Eric Stone-Baumann | ap@aaaorganizedplumbing.com | (707) 621 8282 | Other | Ukiah · Mendocino County | — | — |
| Aaron Construction | Aaron Keith Luedemann | interested@domainmarket.com | (707) 489 0296 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Aaron D Dixon General Contracting | Aaron Daniel Dixon | — | (707) 234 9105 | GC, remodel, ADU | Sea Ranch · Mendocino County | — | — |
| Aaron Kirby Construction | Aaron Mitchell Kirby | — | (707) 972 3679 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| Aaron Scovill | Aaron Scovill | — | (707) 357 4173 | GC, remodel, ADU | Mendocino · Mendocino County | — | — |
| Aaron's Plumbing Heating & Cooling | Aaron's Plumbing Heating & Cooling | — | (707) 357 1420 | HVAC | Fort Bragg · Mendocino County | — | — |
| Aban C Construction INC | Marco David Aban | — | (707) 272 8793 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Abbaca Construction | Jesse Clifton Hutchins | — | (707) 391 5645 | Other | Redwood Valley · Mendocino County | — | — |
| Ace Mechanical | Ace Mechanical | info@ace-mechanical.com | (707) 513 6510 | HVAC | Ukiah · Mendocino County | — | — |
| Acree Painting | Acree Painting | — | (707) 492 2830 | Windows, patio, painters | Fort Bragg · Mendocino County | — | — |
| Advanced Security Systems | Advanced Security Systems | — | (707) 464-1975 | Alarm and generators | Crescent City · Mendocino County | — | — |
| Aguilar Built | Aguilar Built | — | (707) 354 8242 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Ajp Construction | Alden Justin Perry | — | (707) 272 5241 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Akeff Construction Services INC | Jeffrey Scott Green | — | (707) 964 7346 | Other | Fort Bragg · Mendocino County | — | — |
| Al's Construction | Camacho Aldo | — | (707) 272 0885 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Alejandro U Huerta | Alejandro U Huerta | — | (707) 357 0483 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| All About Power | All About Power | — | (707) 671 8077 | Electricians | Hopland · Mendocino County | — | — |
| All Around Construction | David Allen Carroll | info@allaroundconstruction.com | (732) 280-6530 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| All In Heating & Cooling | All In Heating & Cooling | — | (707) 242-1191 | HVAC | Redwood Valley · Mendocino County | — | — |
| All In Heating And Cooling LLC | Ronnie Adam Dodd | — | (707) 485 2615 | HVAC | Redwood Valley · Mendocino County | — | — |
| Allred | Timothy Charles Allred | — | (707) 485 0436 | GC, remodel, ADU | Redwood Valley · Mendocino County | — | — |
| Alvarez Construction | Alvarez Francisco | — | (707) 489 3158 | GC, remodel, ADU | Talmage · Mendocino County | — | — |
| Amaral Construction | Dustin Lee Amaral | — | (707) 972 7560 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| American Manufactured Homes Sales INC | Rodney Donald Usher | — | (707) 462 5000 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Amp Electric | Christopher C Reed | — | (707) 272 3476 | Electricians | Covelo · Mendocino County | — | — |
| Andersen Contracting LLC | Amanda Alice Andersen | — | (707) 884 3643 | HVAC | Gualala · Mendocino County | — | — |