 | BTEK DA | 915450733 | KARASJOK |
| BTI KONSULT AS | 998052084 | OSLO |
| BT RØRSYSTEM PRODUKSJON AS | 970980792 | SARPSBORG |
| BTS-CONSULTING AS | 995673622 | SANDNES |
| BTU BYGG AS | 915019056 | LIER |
| BUBBLEDECK CONSULTING AS | 988456578 | BÆRUM |
| BUCCI ARKITEKTUR & DESIGN AS | 994495585 | ULSTEIN |
| BUCKEN ENTREPRENØR AS | 994325906 | BERGEN |
| BUCK OG BEYER ARKITEKTER AS | 984668430 | LARVIK |
| BUEN BYGG AS | 965745718 | KRAGERØ |
| BUER BYGNINGSVERN AS | 921694032 | LILLESTRØM |
| BUGGE MASKIN OG TRANSPORT AS | 998890934 | MOLDE |
| BUILT ARKITEKTER AS | 931668676 | OSLO |
| BUILT ENTREPRENØR AS | 928594491 | TROMSØ |
| BULLDOZER MASKINLAG ENTREPRENØR AS | 979473524 | SORTLAND |
| BULLDOZER MASKINLAG GEOPRO AS | 920014518 | SORTLAND |
| BULLDOZER MASKINLAG PRODUKSJON AS | 976091701 | SORTLAND |
| BULLS AS | 976212665 | MALVIK |
| BUMA AS | 919565187 | RÆLINGEN |
| BUNDEBYGG AS | 962383149 | OSLO |
| BUNNYS MURERSERVICE FREDRIKSTAD AVD.FLISELEGGNING&BIRØKT ULRICH BANG | 947775464 | RÅDE |
| BURANDT BYGGSERVICE AS | 996617777 | SARPSBORG |
| BUSENGDAL AS | 935426243 | FJORD |
| BUSET AS | 980413241 | MOLDE |
| BUSKERUD BETONG BYGG AS | 997836693 | ØVRE EIKER |
| BUSKERUD BETONGVAREFABRIKK AS | 938106916 | ASKER |
| BUSKERUD BLIKK & MONTASJE AS | 984643845 | DRAMMEN |
| BUSKERUD BYGG & ELEKTRO AS | 999191231 | MODUM |
| BUSKERUD BYGGSERVICE AS | 881088932 | ØVRE EIKER |
| BUSKERUD GJENVINNING AS | 983784186 | ØVRE EIKER |
| BUSKERUD KULDE AS | 982795044 | ØVRE EIKER |
| BUSKERUD RØR & FLIS AS | 998037700 | KONGSBERG |
| BUSKERUD SNEKKERSERVICE AS | 921603851 | RINGERIKE |
| BUSKERUD SPRENGING OG GRAVING AS | 892559252 | DRAMMEN |
| BUSKERUD VA AS | 925893161 | KONGSBERG |
| BUSKERUD VVS AS | 913835905 | KONGSBERG |
| BUSY AS | 912007553 | DRAMMEN |
| BUVIK ELEKTRO AS | 944978682 | TRONDHEIM |
| BV BYGG AS | 818780672 | BERGEN |
| BVH BYGG AS | 925008656 | BIRKENES |
| BVP BYGG AS | 926401750 | ULLENSAKER |
| BVS JOHANSEN | 983484433 | SARPSBORG |
| BWT BIRGER CHRISTENSEN AS | 911031329 | ASKER |
| BY AKUSTIKK AS | 995167808 | OSLO |
| BYÅSEN TREVARE AS | 961393183 | TRONDHEIM |
| BYBERG HAGE OG ANLEGG AS | 981875982 | KLEPP |
| BYBERG & LARSEN MUR & FLIS AS | 998079047 | SOLA |
| BYBERG MASKIN AS | 988350087 | RANDABERG |
| BY BYGG VERDAL AS | 918633162 | VERDAL |
| BYE BERG ELEKTRO AS | 928251985 | SALANGEN |