 | BRUSLETTO BYGG & ANLEGGSRÅDGIVING AS | 993207233 | HOL |
| BRYHN-MASKIN AS | 930774162 | DRAMMEN |
| BRYN BYGG AS | 996558592 | OSLO |
| BRYN BYGGKLIMA AS | 984005288 | ASKER |
| BRYN BYGGTEKNIKK AS | 932114186 | BÆRUM |
| BRYNE ELEKTRISKE AS | 986397582 | TIME |
| BRYNE RØR AS | 886293372 | TIME |
| BRYNJULV LAUVANG | 976242173 | HOL |
| BRYNTE MÅSTADSKAUG | 992470518 | INDRE ØSTFOLD |
| BS BYGG AS | 911564386 | RÆLINGEN |
| BS ENTREPRENØR AS | 914148731 | NAMSOS |
| B.S. GRAVESERVICE AS | 928722570 | SOKNDAL |
| BSK BYGG AS | 933559335 | BERGEN |
| BSL BYGG AS | 812893602 | STRYN |
| BSS BYGGESERVICE AS | 995172194 | NORDRE FOLLO |
| B STUVEBAKKEN AS | 981452151 | GOL |
| BS VEST AS | 963144881 | ØYGARDEN |
| BSW CONSULT AS | 832054992 | TROMSØ |
| BT ANLEGG AS | 920254055 | LILLESTRØM |
| B TARBERG AS | 944082026 | HERØY (MØRE OG ROMSDAL) |
| BT BYGGSERVICE AS | 925574775 | HOLMESTRAND |
| BTEK DA | 915450733 | KARASJOK |
| BTI KONSULT AS | 998052084 | OSLO |
| 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 AS | 910904019 | TRONDHEIM |
| BUGGE MASKIN OG TRANSPORT AS | 998890934 | MOLDE |
| BUGGE & RAVN ARKITEKTER AS | 997682068 | OSLO |
| 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 ANLEGG AS | 917903735 | KONGSBERG |
| BUSKERUD BETONG BYGG AS | 997836693 | ØVRE EIKER |
| BUSKERUD BETONGVAREFABRIKK AS | 938106916 | ASKER |
| BUSKERUD BLIKK & MONTASJE AS | 984643845 | DRAMMEN |