 | BLOMDALS MASKIN AS | 942947240 | LIERNE |
| BLUETECH VVS AS | 924528125 | DRAMMEN |
| BMA HEISTEKNISK RÅDGIVNING AS | 974411709 | OSLO |
| BM ANLEGG AS | 998824842 | VENNESLA |
| BMBA ENTREPRENØR AS | 980378640 | ALTA |
| BMDE AS | 997814436 | HOLMESTRAND |
| BME JOHNSEN AS | 998065011 | TROMSØ |
| BMF ENTREPRISE AS | 920317405 | LILLESTRØM |
| BMH BYGG AS | 917262640 | VOLDA |
| BM MASKIN AS | 988106593 | NES |
| BMO ENTREPRENØR AS | 976098412 | KONGSBERG |
| BMP DRIFT AS | 821576032 | LOM |
| BM RØRSERVICE AS | 822970052 | SULA |
| BM UTEMILJØ AS | 911799960 | MALVIK |
| BN BYGG AS | 999610137 | TRONDHEIM |
| BN ENTREPRENØR AS | 985671230 | TRONDHEIM |
| BNK CONSULT AS | 930160938 | OSLO |
| BOA ENTREPRENØR AS | 927169185 | SØR-AURDAL |
| BO ANDREN NORGE AS | 967281247 | KARMØY |
| Boarch Arkitekter AS | 942937563 | BODØ |
| BO ARKITEKTER AS | 985696241 | BERGEN |
| BOASSON AS | 938309183 | BERGEN |
| BOBYGG ENTREPRENØR AS | 927034786 | SANDEFJORD |
| BOBYGG JÆREN AS | 986394826 | HÅ |
| BØ BYGGTEAM AS | 989255371 | MIDT-TELEMARK |
| BØCON AS | 994968769 | SANDNES |
| BO DESIGN VEST AS | 990024200 | ØYGARDEN |
| BODØ BOLIGTAKST OG KONTROLL AS | 932008130 | BODØ |
| BODØ ELEKTRISKE AS | 915894259 | BODØ |
| BODØ RØR & EIENDOM AS | 925154083 | BODØ |
| BODØ VVS J WILLUMSEN AS | 933629015 | BODØ |
| BØE & BRUVIK ENTREPRENØRSERVICE AS | 976506367 | OSTERØY |
| BOE BYGG AS | 924952016 | BERGEN |
| BØE MASKIN AS | 890831702 | HERØY (MØRE OG ROMSDAL) |
| BØEN GRAVING OG TRANSPORT AS | 992287926 | HJARTDAL |
| B & O FORBERG AS | 911754215 | EIDSVOLL |
| BOGER BYGG AS | 923241280 | RAKKESTAD |
| BOGL NORGE AS | 924678380 | OSLO |
| BOH BYGG AS | 997947568 | KRISTIANSAND |
| BOHLIN MASKIN & TRANSPORT AS | 914232201 | RANA |
| BØHN ANLEGG AS | 899222512 | RAKKESTAD |
| BØHN & HAMAR VVS AS | 925484911 | SØR-AURDAL |
| BØIFOT ELEKTRO AS | 980379191 | KRISTIANSUND |
| BØ INSTALLASJON AS | 984971109 | MIDT-TELEMARK |
| BOIT AS | 914391768 | OSLO |
| BOKANDER RØRTEKNIKK AS | 917592810 | DRAMMEN |
| BOKEMO AS | 931901877 | OSLO |
| BØLE BYGG AS | 988240087 | SIGDAL |
| BØLGEBLIKK ARKITEKTER AS | 939975012 | OSLO |
| BØLGEN VVS AS | 931907581 | SKIEN |