 | BETONMAST ØSTFOLD AS | 993110906 | SARPSBORG |
| BETONMAST ROMERIKE AS | 993925314 | LILLESTRØM |
| BETONMAST RØSAND AS | 918510532 | AVERØY |
| BETONMAST TRØNDELAG AS | 859739822 | TRONDHEIM |
| BETONORTE NORGE AS | 918287833 | LILLESTRØM |
| BETTIKON AS | 928180921 | TIME |
| BETTUM AS | 997897587 | SANDEFJORD |
| BEVERN ANLEGG AS | 991342400 | KONGSBERG |
| BF BYGG ALVDAL AS | 981099621 | ALVDAL |
| B FONDENES AUT RØRLEGGERFIRMA AS | 954623718 | BERGEN |
| B&G BETONGENTREPRENØR AS | 924366346 | LINDESNES |
| BG BRAATEN OG GRANBERG BYGG AS | 931036955 | ÅL |
| BG BYGG SERVICE AS | 918764402 | NANNESTAD |
| BGG ENTREPRENØR AS | 919728752 | ASKER |
| BGM ARKITEKTER AS | 968776614 | GRIMSTAD |
| BGO ELEKTRO AS | 914466016 | BERGEN |
| BG SULDAL AS | 937550987 | SULDAL |
| B&G TUNNEL AS | 920036376 | EIGERSUND |
| BH MASKIN AS | 990264155 | LEIRFJORD |
| BICO BYGG OG INNREDNING AS | 929918487 | KRISTIANSAND |
| BI ELEKTRO AS | 993517534 | BERGEN |
| BIELSKIS BYGG AS | 915940935 | RÆLINGEN |
| BIGERA AS | 993140554 | HAUGESUND |
| BILET'S RØRLEGGERSERVICE | 990706840 | FREDRIKSTAD |
| BILFINGER NORWAY AS | 988996564 | PORSGRUNN |
| BILLKVAM & FAGERHAUG AS | 933692817 | OSLO |
| BILSTAD BYGG AS | 986487549 | LUND |
| BIMTEK HANSEN | 921655258 | SARPSBORG |
| BINAKU BYGG&ANLEGG ENTREPRENØR | 929256018 | RINGERIKE |
| BINTO AS | 986053840 | MELHUS |
| BIOCLEANER RENS AS | 915641784 | BODØ |
| BIOLAND AS | 990832684 | GRAN |
| BIOS ARKITEKTER AS | 995193671 | OSLO |
| BIOVAC ENVIRONMENTAL TECHNOLOGY AS | 985660492 | LILLESTRØM |
| BIOWATER TECHNOLOGY AS | 991422374 | TØNSBERG |
| BIRGER MIETINEN AS | 891289162 | VADSØ |
| BIRGER PEDERSEN AS | 948638177 | NAMSOS |
| BIRGER POLLEN & CO AS | 980490963 | MOSS |
| BIRI RØRSERVICE AS | 931819011 | GJØVIK |
| BIRKELAND AS | 996662292 | SVEIO |
| BIRKELAND BYGG OG ANLEGG AS | 928909905 | BIRKENES |
| BIRKELAND ENTREPRENØRFORRETNING AS | 958848641 | GULEN |
| BIRKEN & CO AS | 988251437 | SANDNES |
| BISC AS | 914962048 | LIER |
| BI SERVICE AS | 914599911 | VESTRE TOTEN |
| BISLET RØR AS | 974400413 | OSLO |
| BISLET SNEKKER AS | 974380838 | NITTEDAL |
| BIT KONSEPT AS | 976937422 | ASKER |
| BITS ARKITEKT OG INGENIØR AS | 913079205 | TØNSBERG |
| BITUMARK BYGG AS | 818347642 | VINJE |