| Cassady And Associates INC | Daniel Bryant Cassady | — | (760) 580 2112 | Electricians | San Marcos · San Diego County | — | — |
| Cassell Glass | Cassell Glass | — | (760) 930 9966 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Cassidy & Associates Property Maintenance & Development | Timothy James Cassidy | — | (619) 275 2525 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Cast Build INC | Daniel Steven Meeh | guy@infinitydesignbuild.com | (858) 754 6060 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Cast Glass Images INC | Christopher Ellis Asselmann | — | (760) 744 7082 | Windows, patio, painters | Escondido · San Diego County | — | — |
| Cast Plumbing | Cast Plumbing | — | (619) 757 3957 | Other | San Diego · San Diego County | — | — |
| Cast Remodeling INC | Miguel Angel Castro Bojorquez | — | (619) 250 6388 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Castaneda Floor Company | Jose Alberto Castaneda | info@castanedafloorco.com | (619) 227 9373 | Other | Chula Vista · San Diego County | — | — |
| Castellanos Glazing | Castellanos Glazing | — | (760) 908 7439 | Windows, patio, painters | Vista · San Diego County | — | — |
| Castellini | Philip Charles Castellini | — | (619) 454 7408 | GC, remodel, ADU | Lakeside · San Diego County | — | — |
| Castello Stone Installation INC | John Arthur Williams | — | (619) 920 1878 | Other | San Diego · San Diego County | — | — |
| Caster Civil INC | Joshua David Caster | — | (619) 312 2022 | Other | El Cajon · San Diego County | — | — |
| Caster Properties INC | Thomas Joseph Kearney | — | (619) 287 8873 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Castillo Construction Sc | Juan Manuel Castillo | — | (619) 723 4593 | GC, remodel, ADU | Imperial Beach · San Diego County | — | — |
| Castillo Contracting Company INC | Castillo Armando | info@castillocontracting.com | (619) 283 2587 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Castillo Hardscape | Castillo Manrique Medrano | — | (760) 979 8171 | Windows, patio, painters | Fallbrook · San Diego County | — | — |
| Castillo Works | Castillo Works | aqremodeling2@gmail.com | (619) 549 3591 | HVAC | Chula Vista · San Diego County | — | — |
| Castillo's Drywall INC | Faustino Escontrias Castillo | — | (619) 994 9145 | Other | National City · San Diego County | — | — |
| Castle Comfort | Juan Carlos Castillo | customerservice@castlecomfort.com | (619) 491 7010 | HVAC | San Diego · San Diego County | — | — |
| Castle Construction & Contracting | Philip John Cabuzzi | — | (760) 521 9555 | GC, remodel, ADU | Fallbrook · San Diego County | — | — |
| Castle Construction And Renovation | Darren William Myhovich | — | (619) 415 3012 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Castle Electric Company INC | Bourque Gregory | goev@castleelectric.com | (858) 775 8105 | Electricians | San Diego · San Diego County | — | — |
| Castle Electric Sd INC | Jose Adan Castillo-torres | — | (619) 337 4138 | Electricians | San Diego · San Diego County | — | — |
| Castle Garage INC | Adam Charles Chertkow | info@castlegarage.com | (760) 746 0128 | Other | Escondido · San Diego County | — | — |
| Castle Steel Buildings INC | Jose Castillo | — | (619) 589 1856 | Other | Spring Valley · San Diego County | — | — |
| Castle Stone & Tile | Castle Stone & Tile | — | (619) 894 4561 | Other | El Cajon · San Diego County | — | — |
| Castlerock Construction INC | Chet Robert Travis | — | (619) 540 9338 | GC, remodel, ADU | Ramona · San Diego County | — | — |
| Castorena Painting | Castorena Painting | — | (619) 901 5852 | Windows, patio, painters | El Cajon · San Diego County | — | — |
| Castrejon Concrete LLC | Richard Anthony Castrejon | castrejonconcrete@gmail.com | (619) 820 9923 | Other | Spring Valley · San Diego County | — | — |
| Castro Electric | Edward John Anthony Castro | — | (619) 561 6122 | Electricians | Lakeside · San Diego County | — | — |
| Castro Painting Company | Cesar Castro | — | (619) 616 1559 | Windows, patio, painters | National City · San Diego County | — | — |
| Catalano Grading INC | Catalano Ronni | — | (760) 533 8844 | Other | Valley Center · San Diego County | — | — |
| Catalina Build & Design INC | Audrey Susan Fitzgerald | — | (619) 314 5444 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Catalina Pools INC | Joseph Warren Marsh | — | (619) 821 2086 | Pool | National City · San Diego County | — | — |
| Catching H2o INC | Brook Leigh Sarson | sales@catchingh2o.com | (760) 206 3175 | GC, remodel, ADU | Valley Center · San Diego County | — | — |
| Cats Excavating INC | Stephen Groves | — | (619) 264 4125 | Other | San Diego · San Diego County | — | — |
| Cats General Engineering | Groves S H | — | (619) 264 4125 | Other | San Diego · San Diego County | — | — |
| Catspaw Design-build INC | Anthony Gregory Pawlowski | — | (760) 716 0595 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Caudillo's Landscape | Caudillo's Landscape | — | (760) 802 2585 | Windows, patio, painters | Oceanside · San Diego County | — | — |
| Cavanaugh Construction Corp | Dana Paul Cavanaugh | — | (619) 435 6155 | GC, remodel, ADU | Coronado · San Diego County | — | — |