| 1 Call Flood & Construction Specialist LLC | Shawn Bush | — | (619) 954 5162 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| 101 Mobility Of San Diego | Todd Robert Girouard | — | (858) 800 2820 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| 1015 Construction | Arthur Charles Mansir | — | (760) 415 4245 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| 10ten Construction LLC | Jessica Marie Gilmour | — | (760) 712 7840 | GC, remodel, ADU | Fallbrook · San Diego County | — | — |
| 10x33 Construction Consulting | Zakar Gamaliel Jayne | — | (619) 995 1023 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 123 Remodeling Ca INC | David Lavi | dreamsrenovationca@gmail.com | (858) 240 1123 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 13zero3 Construction | Gaetano Gino Giacalone | eben@eyebytes.com | (619) 731 4242 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 1904 Construction | Reid Michael Schneider | — | (619) 550 6384 | GC, remodel, ADU | Lakeside · San Diego County | — | — |
| 1M Enterprises INC | Nicholas Ryan Fleming | — | (760) 697 6999 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| 1quality Construction Corp | Jose Luis Hernandez Tellez | — | (760) 310 6308 | GC, remodel, ADU | Vista · San Diego County | — | — |
| 1st Choice Backflow And Construction | Henry George Kohlmann | — | (760) 468 4026 | GC, remodel, ADU | Bonsall · San Diego County | — | — |
| 2 Bros Construction INC | Aispuro Jonathan Guerrero | jordan@bros-construction.com | (619) 496 1364 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 2 Brothers Construction INC | Mike Iloski | — | (760) 802 5539 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| 2 Minds Design Construction | Gonzalo Flores-Mayorga | — | (619) 721 7537 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| 21 Degrees Construction | Martinez Hernandez Sergio | — | (760) 519 7414 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| 21M Construction Co | Francisco Javier Oseguera | — | (619) 215 3335 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 21st Century Design | 21st Century Design | — | (619) 708 6725 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| 24 / 7 Pro Construction INC | Zeena George Alsheikh | — | (619) 607 2507 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| 3 | Farid Andres Ayoubzadeh-Reyes | — | (619) 879 4105 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 3 D Environmental INC | Drew Paul Castro | — | (619) 546 0105 | GC, remodel, ADU | Spring Valley · San Diego County | — | — |
| 3 Day Kitchen & Bath | Oved Yakir | info@3day-kitchenbath.com | (619) 558 6950 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 3 Lopez Brother's Construction Corp | Alejandro Gomez | — | (442) 245 9705 | GC, remodel, ADU | San Marcos · San Diego County | — | — |
| 3 Peaks Construction LLC | Christopher Michael Rice | guy@infinitydesignbuild.com | (760) 212 5484 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| 3-points Design+build INC | Lisa Ann Molgren | hello@rfuenzalida.com | (310) 513 5453 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 360 Community Management | Geremy Alan Robenolt | — | (408) 559-1977 | GC, remodel, ADU | Santee · San Diego County | — | — |
| 360 Windows And Doors | Zachary Kayem Morrison | buildzoomsupport@blockrenovation.com | (619) 331 5246 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 365 Cleaning & Restoration | Leif Aaron Riley | jamil@symonsfp.com | (858) 652 9927 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 3677 Columbia LLC | Ahmed Samih Eldahmy | — | (619) 313 1061 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 3B Construction Company LLC | Brandon Gene Madeira Wilcox | guy@infinitydesignbuild.com | (760) 473 7125 | GC, remodel, ADU | Encinitas · San Diego County | — | — |
| 3js Construction INC | Jose D Jacobo | buildzoomsupport@blockrenovation.com | (858) 688 8247 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 3p's Home Improvement INC | Pedro Gabriel Maldonado Santiago | — | (760) 717 6230 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| 3sixty Innovation INC | Mohamad Ismieal Muhsin | — | (858) 304 1093 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 4 J Construction | Jesse Derwin Simeroth | — | (760) 533 0586 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 4 Jay's Construction Services INC | Jesus Andres Ordaz Estala | — | (619) 576 1279 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| 4 X 8 Construction INC | Vincent Joseph Posada | — | (619) 279 2941 | GC, remodel, ADU | Poway · San Diego County | — | — |
| 4dream Builders INC | Alfonso Sr Mendez | aqremodeling2@gmail.com | (619) 416 4430 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| 4mar Construction INC | Marco Tulio Ramos Segura | guy@infinitydesignbuild.com | (619) 955 3207 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 5 In 1 Construction INC | Victor Manuel Carrasco | guy@infinitydesignbuild.com | (619) 874 0406 | GC, remodel, ADU | San Ysidro · San Diego County | — | — |
| 5 Olague Construction INC | Marco Antonio Olague-Rivera | — | (619) 372 3105 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| 568 Construction INC | Daniel So | — | (619) 995 4172 | GC, remodel, ADU | San Diego · San Diego County | — | — |