| Black Mountain Plumbing INC | Walter Scott Ferrell | hcp@blackmountainplumbing.com | (858) 536 4161 | Other | San Diego · San Diego County | — | — |
| Black Rock Pools INC | Daniel Harding Ii Dougherty | dan@blackrockpools.com | (760) 802 6359 | Pool | San Marcos · San Diego County | — | — |
| Black Sage Environmental INC | Roberto Luis Bejar | — | (619) 876 0745 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Blackburn Drainage & Construction INC | Sydney Scott Blackburn | — | (619) 933 4564 | Other | Boulevard · San Diego County | — | — |
| Blacked Out Tint Home & Office | Matthew Michael Mcdonough | blackedouttinthomeoffice@gmail.com | (619) 885 0186 | Other | Dulzura · San Diego County | — | — |
| Blackheart Building Solutions | Daniel Reid Coon | dan@blackheartbuilding.com | (760) 805 3038 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Blackipo | Wendell Ray Stemley | — | (613) 527 1668 | Other | San Diego · San Diego County | — | — |
| Blackmon Plumbing | Blackmon Plumbing | — | (619) 261 4539 | Other | San Diego · San Diego County | — | — |
| Blackstar Facility Solutions INC | Jeffrey Donald Miller | — | (800) 591 0055 | Other | Fallbrook · San Diego County | — | — |
| Blackstone Granite & Marble INC | Samuel David Cunha Goncalves | — | (760) 295 8883 | Other | Vista · San Diego County | — | — |
| Blackwell Satellite Systems | Blackwell Satellite Systems | — | (619) 589 8964 | Other | San Diego · San Diego County | — | — |
| Blackwood Electric | Travis Christopher Tompkins | info@blackwoodelectric.com | (760) 575 4031 | Electricians | Oceanside · San Diego County | — | — |
| Blaine's Quality Carpets | Blaine's Quality Carpets | — | (619) 654 0126 | Other | El Cajon · San Diego County | — | — |
| Blair Sign Programs INC | Bilbrey Scott | — | (619) 792 1600 | Other | Santee · San Diego County | — | — |
| Blake & Sons INC | Justin Lloyd Blake | — | (619) 414 7495 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| Blake Vasek DBA Artisan Construction | Blake Patrick Vasek | — | (619) 997 9251 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Blake's Electric | Charles Edward Blake | eddie.haro@electricare.com | (760) 525 2074 | Electricians | San Marcos · San Diego County | — | — |
| Blanco Remodeling & Construction Company | Larry Nathan Krasnow | — | (619) 889 1557 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Blatt Wallcovering | Blatt Wallcovering | elishablatt@gmail.com | (619) 582 4449 | Other | San Diego · San Diego County | — | — |
| Blaze Tile And Stone | Blaze Tile And Stone | — | (760) 518 8726 | Other | Valley Center · San Diego County | — | — |
| Blazek Electric | Blazek Laddie | blazekelectric@cox.net | (760) 745 5398 | Electricians | Escondido · San Diego County | — | — |
| Blazeshield Fire | Blazeshield Fire | — | (619) 818 1995 | Other | El Cajon · San Diego County | — | — |
| Bldg Creative Company | Jesse William Lyons | info@bldgcreative.com | (619) 796 2560 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Blessed | Mark Anthony Eldridge | — | (858) 665 9250 | Other | San Diego · San Diego County | — | — |
| Blessent Building LLC | Daniel Jeffery Blessent | dan@blessentbuilding.com | (619) 787 6050 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Bliss Construction Company | Christopher Shucri Yaghi | — | (714) 267 5116 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Bloc Construction INC | Aman Dian | — | (858) 539 3516 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Block 33 LLC | Kaled Hasanagic | — | (617) 386 3528 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Block Framing INC | Solis Gil Armando | — | (760) 884 6108 | Other | Poway · San Diego County | — | — |
| Block Island Remodeling | Block Island Remodeling | buildzoomsupport@blockrenovation.com | (858) 668 6021 | GC, remodel, ADU | Poway · San Diego County | — | — |
| Block's Locks INC | Larry Dean Block | — | (619) 429 5625 | Other | Imperial Beach · San Diego County | — | — |
| Blooming Gardens Landscape Maintenance | Castro Gustavo Marquez | — | (619) 913 3330 | Windows, patio, painters | Chula Vista · San Diego County | — | — |
| Blore's Contracting | Joshua Rolland Blore | — | (619) 985 1515 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Blossom Landscape INC | Carreno Bueno Benancio | — | (760) 978 4195 | Windows, patio, painters | Vista · San Diego County | — | — |
| Blossom Valley Grading INC | Ricky Neil Horn | — | (619) 200 5966 | Other | El Cajon · San Diego County | — | — |
| Blu Heating And Air | Blu Heating And Air | steved@precision-ac.com | (619) 380 0921 | HVAC | National City · San Diego County | — | — |
| Blue Agave Landscape Management & Design INC | Jose Jesus Tapia Tejeda | — | (619) 343 4372 | Windows, patio, painters | El Cajon · San Diego County | — | — |
| Blue Balance Pool Service | Marc Joseph Impastato | — | (619) 596 2583 | Pool | El Cajon · San Diego County | — | — |
| Blue Belt Construction INC | Roberto Emiliano Ayala | constructionbluebelt@gmail.com | (619) 674 2802 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Blue Bridge Building & Construction | Jose Pedro Jr Estrada | guy@infinitydesignbuild.com | (858) 910 1199 | GC, remodel, ADU | San Diego · San Diego County | — | — |