| Bailer Hill Construction INC | William Arthur Jr Wennerholm | — | (760) 580 9685 | GC, remodel, ADU | Cardiff By The Sea · San Diego County | — | — |
| Bailey Bros Construction | Douglas Adam Bailey | — | (619) 540 0181 | GC, remodel, ADU | Imperial Beach · San Diego County | — | — |
| Bailey Electric And Supply | Kenneth Alan Bailey | contact@claycoelectric.org | (619) 749 6714 | Electricians | Ramona · San Diego County | — | — |
| Bailey Refrigeration Heating & Air - Conditioning INC | Harold William Bailey | — | (619) 442 0723 | HVAC | El Cajon · San Diego County | — | — |
| Bain And Co | Mitchell James Bain Scott-Fell | — | (858) 999 1144 | GC, remodel, ADU | Encinitas · San Diego County | — | — |
| Bair Hand Construction INC | Christopher Thomas Bair | — | (760) 846 4368 | GC, remodel, ADU | San Marcos · San Diego County | — | — |
| Baird Painting & Decorating | Baird Painting & Decorating | — | (760) 978 7732 | Windows, patio, painters | Carlsbad · San Diego County | — | — |
| Baja Coast Construction | Dana Fukuyama Silberman | — | (818) 209 6424 | GC, remodel, ADU | San Ysidro · San Diego County | — | — |
| Baja Construction Ii INC | Donate Ruiz Jaime | buildzoomsupport@blockrenovation.com | (619) 571 3166 | GC, remodel, ADU | San Ysidro · San Diego County | — | — |
| Baja Design & Construction INC | Josue Efrain Reynoso Jimenez | — | (619) 495 3453 | GC, remodel, ADU | Imperial Beach · San Diego County | — | — |
| Baja Door & Lock | Baja Door & Lock | — | (619) 933 7403 | Other | El Cajon · San Diego County | — | — |
| Baja Electrical Technologies | De La Pena Roberto | — | (619) 361 6972 | Electricians | National City · San Diego County | — | — |
| Baja Exploration | Baja Exploration | — | (760) 743 7678 | Other | Escondido · San Diego County | — | — |
| Baja Fence Co | Adolfo Cosme Ortiz Lizola | info@bajafence.com | (619) 250 4449 | Other | San Diego · San Diego County | — | — |
| Baja Glass & Mirrors | Esteban Rafael Rodriguez Nieto | — | (619) 322 5203 | Windows, patio, painters | Chula Vista · San Diego County | — | — |
| Baja Landscape Design | Herrera Emmanuel Sanchez | — | (760) 975 6835 | Windows, patio, painters | Escondido · San Diego County | — | — |
| Baja Pool & Spa Service | Gabriel William Clum | — | (760) 815 2522 | Pool | Cardiff · San Diego County | — | — |
| Baja Rooter INC | Silvano Aguilar Covarrubias | — | (619) 265 6834 | Other | San Diego · San Diego County | — | — |
| Baja Signs | Baja Signs | — | (619) 653 7310 | Other | Chula Vista · San Diego County | — | — |
| Baja Steel Erectors INC | Garcia David Duran | — | (619) 739 1847 | Other | Imperial Beach · San Diego County | — | — |
| Bajastone INC | Mayra Patricia Chavez | — | (619) 759 8477 | Other | San Diego · San Diego County | — | — |
| Bak - Re - Pair INC | Filipo Gilbert | — | (858) 658 0630 | Other | San Diego · San Diego County | — | — |
| Baker Air Conditioning | Baker Air Conditioning | bakerairconditioning1@gmail.com | (619) 776-6200 | HVAC | Oceanside · San Diego County | — | — |
| Baker Design & Build | Baker Design & Build | — | (760) 533 8137 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Baker Electric | Brian Francis Brown | — | (760) 745 2001 | Electricians | Escondido · San Diego County | — | — |
| Baker Home Energy | Teressa Anne Wickham | — | (760) 546 6000 | Other roofers | Escondido · San Diego County | — | — |
| Baker Iron Works INC | Susan Ash Bruun | — | (858) 755 2255 | Other | Solana Beach · San Diego County | — | — |
| Baker Pool Service INC | Daniel Stewart Baker | — | (760) 212 4553 | Pool | Oceanside · San Diego County | — | — |
| Baker Renovations | Baker Renovations | — | (619) 735 0283 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Balam Roofing | Anwar Donicety Del Villar Hernandez | balamroof@gmail.com | (760) 224 6077 | Other roofers | Fallbrook · San Diego County | — | — |
| Balance America INC | Krikor Babayan | — | (760) 798 9255 | Other | San Marcos · San Diego County | — | — |
| Balanced Heating & Cooling | Balanced Heating & Cooling | — | (714) 488 0980 | HVAC | Carlsbad · San Diego County | — | — |
| Balanced Pool And Spa Care LLC | Devin Duarte Garcia | — | (619) 920 7645 | Pool | San Diego · San Diego County | — | — |
| Balazs Electrical Service | Mark Michael Balazs | — | (858) 380 7311 | Electricians | San Diego · San Diego County | — | — |
| Balboa Built INC | Justin Lord Santos | justin@balboabuilt.com | (619) 384 9797 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Balboa Construction INC | Fia Yuen Dowsing | — | (760) 598 2160 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Balboa Electric | Dennis George Gittens | info@balboaelectric.com | (619) 928 9894 | Electricians | La Mesa · San Diego County | — | — |
| Balboa Fence Company LLC | Brett Gilliland Kidder | — | (858) 740 6286 | Other | Santee · San Diego County | — | — |
| Balcazar Electric INC | Balcazar Armando | — | (858) 663 0659 | Electricians | San Diego · San Diego County | — | — |
| Balcazar Tile And Marble | Balcazar Tile And Marble | — | (619) 339 2336 | Other | Chula Vista · San Diego County | — | — |