| 2 Scorpio Communications | 2 Scorpio Communications | — | (916) 412 2446 | Other | Lincoln · Placer County | — | — |
| 24 Seven Tile | 24 Seven Tile | — | (916) 218 9805 | Other | Roseville · Placer County | — | — |
| 2C General Engineering | Shannon Dean Criss | — | (530) 230 3861 | Tree | Roseville · Placer County | — | — |
| 3 D Plumbing | 3 D Plumbing | — | (650) 714 7692 | Other | Auburn · Placer County | — | — |
| 3 Feathers Construction | Ronald Frederick Ii Montez | — | (702) 339 2964 | GC, remodel, ADU | Loomis · Placer County | — | — |
| 3 Forks Construction | Chad Lee Gardner | — | (916) 295 3690 | GC, remodel, ADU | Lincoln · Placer County | — | — |
| 3 Mountain Construction | James Harold Huss | glenng@mountain-construction.com | (913) 207-5937 | GC, remodel, ADU | Lincoln · Placer County | — | — |
| 316 Builder | 316 Builder | — | (916) 869 0022 | Electricians | Newcastle · Placer County | — | — |
| 3D Built | Omar Mohammad Abu Afifeh | — | (916) 399 3575 | Electricians | Roseville · Placer County | — | — |
| 3G Electric | Chad Steven Gaytan | — | (916) 461 9009 | Electricians | Lincoln · Placer County | — | — |
| 4 Cals Concrete Pumping | 4 Cals Concrete Pumping | — | (916) 548 3283 | Other | Roseville · Placer County | — | — |
| 4 Schoer Construction | Steven Paul Schoer | — | (916) 826 8218 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| 4 Seasons Construction Services | Thomas Russell Allison | — | (916) 832 9449 | GC, remodel, ADU | Roseville · Placer County | — | — |
| 4 X 4 Construction | Justin Thomas Foxworthy | — | (530) 305 4464 | GC, remodel, ADU | Foresthill · Placer County | — | — |
| 4H Construction | Hayder Ali Radhi | — | (925) 788 1718 | GC, remodel, ADU | Roseville · Placer County | — | — |
| 5 Star Roofing LLC | Michael James Andrew Sperling | — | (916) 474 4531 | Other roofers | Rocklin · Placer County | — | — |
| 530 Pipe Flow | 530 Pipe Flow | info@pipeflow.com | (530) 906 1226 | Other | Auburn · Placer County | — | — |
| 5P Iron | 5P Iron | — | (916) 293 1130 | Other | Newcastle · Placer County | — | — |
| 5th Generation Plumbing | 5th Generation Plumbing | — | (916) 470 3132 | Other | Rocklin · Placer County | — | — |
| 747 Construction | Jeremy Dean Callison | — | (916) 872 0726 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| 9 Elevate | 9 Elevate | — | (916) 607 7663 | Other | Auburn · Placer County | — | — |
| 916 Floors INC | Pavlo Pavliouk | — | (916) 303 3731 | Other | Roseville · Placer County | — | — |
| A & A Electric LLC | Anatoliy Jr Oleshko | — | (916) 895 4942 | Electricians | Auburn · Placer County | — | — |
| A & A Group Services INC | Ronald Paul Ii Ashlock | — | (530) 368 6258 | Electricians | Lincoln · Placer County | — | — |
| A & J Construction | Anthony Lee Pizarro | — | (530) 613 0527 | GC, remodel, ADU | Applegate · Placer County | — | — |
| A - R Smit & Associates | Ronald Clemens Smit | — | (916) 997 4600 | GC, remodel, ADU | Lincoln · Placer County | — | — |
| A 1 Quality Flooring | A 1 Quality Flooring | — | (916) 821 3329 | Other | Rocklin · Placer County | — | — |
| A A A National Electric | Duane Elliott Gorbet | — | (530) 844 4811 | Electricians | Colfax · Placer County | — | — |
| A A A Painting | A A A Painting | — | (916) 873 5907 | Windows, patio, painters | Roseville · Placer County | — | — |
| A A Fire Systems INC | Manuel Neftali Valdez Perez | — | (916) 933 0800 | Other | Granite Bay · Placer County | — | — |
| A A Glass Shop INC | Robert Allen Weitzel | robert@aaglassshop.com | (530) 885-7211 | GC, remodel, ADU | Loomis · Placer County | — | — |
| A And A Electric | Raymond Richard Anderson | — | (916) 344 1019 | Electricians | Roseville · Placer County | — | — |
| A B Morton Construction LLC | Andre Blaine Morton | — | (916) 960 9513 | GC, remodel, ADU | Roseville · Placer County | — | — |
| A B Sandoval Landscaping & Maintenance INC | Cruz Enrique Romero | — | (916) 284 6928 | Windows, patio, painters | Lincoln · Placer County | — | — |
| A B T Plumbing & Drain Service INC | Andrew Bennett Twidwell | — | (530) 272 9120 | HVAC | Bowman · Placer County | — | — |
| A Better Door Co | Nikitin Sergey | — | (916) 275 7099 | Other | Roseville · Placer County | — | — |
| A C Dike Co | Paul Floyd Mc Clain | — | (916) 645 7747 | Other | Lincoln · Placer County | — | — |
| A C Enterprises | Frank Douglas Bell | — | (530) 368 2240 | GC, remodel, ADU | Auburn · Placer County | — | — |
| A C Painting | A C Painting | — | (530) 368 4429 | Windows, patio, painters | Auburn · Placer County | — | — |
| A C W Construction INC | Richard Brian Andrews | — | (530) 581 2292 | GC, remodel, ADU | Olympic Valley · Placer County | — | — |