| B D Unique Construction Company | Bi Sheng Deng | — | (415) 217 9728 | HVAC | San Francisco · San Francisco County | — | — |
| B Dela Rionda Builders | B Dela Rionda Builders | — | (415) 341 7984 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| B E A M Construction Enterprises INC | Edward Joseph Reilly | — | (650) 302 8600 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| B E I Steel INC | Anne Elizabeth Rocco | admin@beisteel.com | (415) 661 8623 | Other | San Francisco · San Francisco County | — | — |
| B Gil Dowd Iii | B Gil Dowd Iii | — | (415) 986 3889 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| B H Chen INC | Humphrey Yong Hui Chen | — | (415) 401 8257 | HVAC | San Francisco · San Francisco County | — | — |
| B M A Solutions Ltd | William Marci | — | (408) 472 1007 | Electricians | San Francisco · San Francisco County | — | — |
| B N Plumbing | B N Plumbing | — | (415) 298 6262 | Other | San Francisco · San Francisco County | — | — |
| B R J Construction | Richard Lewellyn Johns | — | (415) 515 8453 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| B R S Construction | Bevc Robert | — | (415) 793 0102 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| B&k Construction INC | Bo Zhong Liang | — | (415) 990 9431 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Baa General Builder | Bernabe Arsenio Aguilar | — | (415) 317 7069 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Babcock & Donne | Babcock & Donne | — | (415) 518 4270 | Electricians | San Francisco · San Francisco County | — | — |
| Bac Services INC | Ruairi Patrick Murphy | — | (415) 366 7640 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Backyardz Company | Thales Augusto Dos Nugas | — | (530) 524 9165 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bacon Plumbing Co INC | Shayne David Bacon | — | (628) 867 7575 | HVAC | San Francisco · San Francisco County | — | — |
| Badger Construction | Sean Bernard Badger | — | (415) 731 8614 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Baez Construction | Baez Martinez Jesus | — | (415) 872 2798 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Baf Specialty INC | Troy Allen Geier | — | (415) 874 9840 | Other | San Francisco · San Francisco County | — | — |
| Bahman & Hoch INC | Bahman Foroudian | — | (415) 779 0771 | Other | San Francisco · San Francisco County | — | — |
| Bahubali Shetti | Bahubali Shetti | — | (408) 981 2722 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bai Yuan Li Construction Co | Bai Yuan Li | — | (415) 309 4935 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bail Construction | Rudy Anastacio Bail Navarro | — | (415) 424 6963 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bailey General Contracting Co INC | Matthew Ryan Bailey | — | (415) 592 8888 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Baines - Nibbi J V | Bros Associates INC Nibbi | — | (415) 863 1820 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Baines Group INC | Michael Erwin Baines | — | (510) 206 8558 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Balboa Construction | Omar Suleiman Hijazi | — | (510) 387 5892 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Balistreri Commercial Property Development | Balistreri Commercial Property Development | — | (415) 724 4549 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bana Construction INC | Ahmad Larizadeh | — | (415) 752 2824 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bancal Properties | Bancal Properties | info@bancalsf.com | (415) 397-1044 | Property managers | San Francisco · San Francisco County | — | — |
| Bannerman Security | Bannerman Security | matt@bannerman.com | (415) 697-0610 | Alarm and generators | San Francisco · San Francisco County | — | — |
| Bannon Construction INC | Brendan John Bannon | — | (415) 810 4201 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bao Hengda INC | Bao Long Li | — | (415) 813 8267 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Bao Plumbing | Bao Plumbing | — | (415) 987 7636 | Other | San Francisco · San Francisco County | — | — |
| Barahona Brothers Construction INC | Julio Ricardo Barahona | — | (415) 532 7146 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Baran Painting | Baran Painting | — | (415) 678 0179 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Barcci Builders INC | Reynaldo Antonio Medina-Chavez | info@barccibuilders.com | (310) 990 0325 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Barker - O'donoghue Master Builders | Kieran Terence O'donoghue | — | (650) 270 1879 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Barrett Karber Built LLC | Barrett Mitchell Karber | — | (580) 744 0077 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Barrios Painting INC | Edgar Gioveli Barrios De Leon | barriospainting@yahoo.com | (415) 424 2470 | Windows, patio, painters | San Francisco · San Francisco County | — | — |