| William Bogdan | William Bogdan | — | (805) 543 6571 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| William Foote Construction | William Raymond Foote | — | (805) 674 5529 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| William Gerhardt | William Gerhardt | — | (805) 602 1350 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| William J Faulkner | William J Faulkner | — | (650) 504 8344 | GC, remodel, ADU | Creston · San Luis Obispo County | — | — |
| William Lewis Hurley | William Lewis Hurley | — | (805) 441 0749 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| William Ridino Construction Co INC | William John Ridino | — | (805) 296 4668 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| William Robert Atkinson | William Robert Atkinson | — | (805) 481 1287 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Williams Concrete Construction INC | Stephen Alvis Williams | — | (805) 235 4344 | Other | Los Osos · San Luis Obispo County | — | — |
| Williams Construction Co | Johnny Jay Williams | — | (818) 439 0155 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Williams Engineering | Williams Engineering | — | (805) 772 4807 | Other | Morro Bay · San Luis Obispo County | — | — |
| Williams House Of Carpet INC | Scott Kent Williams | — | (805) 466 9748 | Other | Atascadero · San Luis Obispo County | — | — |
| Wilson Excavating & Grading Incorporated | Douglas Ray Wilson | — | (805) 801 1773 | Other | Oceano · San Luis Obispo County | — | — |
| Wine Country Cabinetry | Wine Country Cabinetry | — | (805) 434 1713 | Other | Paso Robles · San Luis Obispo County | — | — |
| Wine Country Concrete | Wine Country Concrete | — | (805) 610 1552 | Other | Paso Robles · San Luis Obispo County | — | — |
| Wine Country Landscape | Wine Country Landscape | — | (805) 400 0175 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Wine Country Renovations LLC | Scott Anthony Grunow | — | (805) 400 0235 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Wine Country Roofing | William Earl Duggins | — | (805) 391 0596 | Other roofers | Templeton · San Luis Obispo County | — | — |
| Winemech | Fintan Charles Du Fresne | office@winemech.com | (805) 305 7796 | Other | Atascadero · San Luis Obispo County | — | — |
| Wire Run | Wire Run | — | (805) 515 0000 | Electricians | Pismo Beach · San Luis Obispo County | — | — |
| Witrago Painting LLC | Luis Witrago | witragopainting@gmail.com | (805) 536 9376 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Woeste Fence And Gate | Woeste Fence And Gate | — | (805) 431 4658 | Other | Nipomo · San Luis Obispo County | — | — |
| Womack Construction | Terry James Womack | — | (805) 459 9103 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Wommack Electric | Jonathon Alan Wommack | — | (805) 286 1878 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Wood Element | Brian Douglas Budd | — | (805) 234 7656 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Wood Floor Pro | Wood Floor Pro | — | (805) 801 4774 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Woodmans - Fine Cabinets & Furniture | Timothy Edward| Woodman Tim Edward Woodman | — | (805) 801 2981 | Other | Cayucos · San Luis Obispo County | — | — |
| Woodrum Construction INC | Chad Michael Woodrum | — | (805) 610 7990 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Woods Irrigation And Landscape Services LLC | Erik Gregory Jones | — | (805) 779 0166 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Woodtech Cabinet Specialists INC | William Louis Jr Breneman | — | (805) 544 4828 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Woodward Acoustics INC | Michael Kent Woodward | — | (805) 462 0892 | Other | Atascadero · San Luis Obispo County | — | — |
| Woodward Construction | David Michael Woodward | — | (805) 792 2289 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Woodworth Home Builders The Corporation | John Richard Woodworth | — | (805) 748 2847 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Workhorse Custom Builders | Larry Wayne Silveira | — | (805) 286 5789 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Woulbroun Construction INC | John Charles Woulbroun | — | (805) 610 7265 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Wright Electric | Kevin Doyle Wright | — | (805) 400 9309 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Wright Landscape Incorporated | Nathan Allen Wright | — | (805) 423 2541 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| Www Construction Co LLC | Michael Wayne| Woodruff Woody Woodruff | — | (805) 434 2372 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Wyatt Wicks Finish Carpentry INC | Wyatt Kelly Wicks | — | (805) 434 3755 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Wysong Construction Company | Larry M Wysong | darcy@wysongconstruction.com | (805) 466 1038 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Yager Construction | Tyler John Yager | — | (805) 458 2289 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |