 | AUSEN AS | 989506080 | LILLESTRØM |
| AUSTAD & BJERKNES AS | 969032678 | HEIM |
| AUSTAD MASKINSTASJON AS | 969026244 | INDERØY |
| AUSTDAL GRUNNMUR OG GRAVESERVICE AS | 914802970 | RINGSAKER |
| AUSTENAA TRANSPORT AS | 995721910 | EVJE OG HORNNES |
| AUSTERDALEN BYGG AS | 998015812 | KVINESDAL |
| AUSTEVOLL BYGG AS | 987606002 | AUSTEVOLL |
| AUSTEVOLL TRELAST AS | 963651430 | AUSTEVOLL |
| AUSTRA BYGG OG REHABILITERING AS | 911633256 | ØRLAND |
| AUT MASKINENTREPRENØR OLAV MARTIN SØRLI AS | 979389523 | KRISTIANSAND |
| AUTOMATIKK MONTASJE AS | 933144178 | OSLO |
| AUTRONICA FIRE AND SECURITY AS | 979975503 | TRONDHEIM |
| AUT-RØRLEGGER BRØDRENE JOHNSEN AS | 922305412 | HOLE |
| A VÅGE AS | 999654126 | VOLDA |
| AVARTEKT AS | 916583907 | DRAMMEN |
| AVE SYSTEMER AS | 997812905 | HÅ |
| AVITELL AS | 910405004 | KRISTIANSAND |
| AVITRON NORGE AS | 917457999 | BERGEN |
| AVLØP OG UTEMILJØ AS | 918834729 | SKAUN |
| A. VOLD ARKITEKTUR AS | 933464563 | HAMAR |
| AVSHOP AS | 988897833 | OSLO |
| AV SPRINKLER AS | 918717560 | INDRE ØSTFOLD |
| AV TAKST & CONSULT Arild Leif Valle | 985685983 | ÅLESUND |
| A. WAAGE BYGG AS | 925747173 | BERGEN |
| AWAT-RØR AS | 925382930 | DRAMMEN |
| AWER NORGE AS | 929608496 | ASKER |
| A W KARLSEN AS | 991831495 | HOLMESTRAND |
| AWS BYGG OG BOLIG AS | 942810792 | FÆRDER |
| AXA BYGGSNEKKER AS | 925738417 | OSLO |
| AXELSSONS TAKSERVICE AS | 933037231 | RANA |
| AXEN ENTREPRENØR AS | 930702501 | HOLMESTRAND |
| AXNES BYGG AS | 918852786 | VANYLVEN |
| AXOR VVS AS | 822995462 | HOLMESTRAND |
| AZ BYGG OG FLISLEGGER AS | 928538257 | BÆRUM |
| AZ GARTNER AS | 992542462 | FROSTA |
| B2 ELEKTRO AS | 924386525 | OSLO |
| B45 ANLEGG AS | 926376918 | NOME |
| BAARDSEN ARKITEKTER AS | 931754270 | LILLESAND |
| BA ARKITEKTER AS | 940203899 | OSLO |
| BAASLAND AS | 987622237 | ARENDAL |
| BAASTAD MEKANISKE AS | 913890523 | INDRE ØSTFOLD |
| BAAX BOLIG AS | 927809753 | KLEPP |
| BACAS AS | 984912471 | SANDEFJORD |
| BACH JOHANSEN HÅNDVERK AS | 912124398 | LARVIK |
| BACKE BERGEN AS | 995144425 | BERGEN |
| BACKE IDRETTSBYGG AS | 917612064 | BÆRUM |
| BACKE OPPLAND AS | 938034087 | GJØVIK |
| BACKE ØSTFOLD AS | 980369897 | FREDRIKSTAD |
| BACKE ROGALAND AS | 992352612 | STAVANGER |
| BACKE ROMERIKE AS | 835751252 | ULLENSAKER |