 | AT BYGGSERVICE AS | 912737489 | KRISTIANSUND |
| AT CONSULT LARISA KARTASHEVA | 915712754 | OSLO |
| ATEAM INNEKLIMASERVICE AS | 982175577 | OSLO |
| ATE AS | 998196310 | PORSGRUNN |
| ATECCO AS | 924813423 | AURSKOG-HØLAND |
| A-TECH BYGGMONTERING AS | 930951293 | BAMBLE |
| ATEC VOSS AS | 987309547 | VOSS |
| ATELIER GRØSTAD ARKITEKTUR AS | 943885486 | NOTODDEN |
| ATELIER LORENTZEN LANGKILDE APS | 813431602 | |
| ATELIER OSLO AS | 994734938 | OSLO |
| ATH BYGGSERVICE AS | 911742063 | NORDRE FOLLO |
| ATI ELEKTRO AS | 927452979 | ARENDAL |
| A TIL Å ENTREPRENØR AS | 972416533 | TINN |
| ATI VVS AS | 927992523 | ARENDAL |
| ATLANT ENTREPRENØR AS | 918270116 | TØNSBERG |
| ATLANTERBYGG OG EIENDOM AS | 927302306 | KRISTIANSUND |
| ATLANTERPRODUKTER AS | 968651242 | VESTVÅGØY |
| ATLAS BYGG AS | 835032302 | OSLO |
| ATL BYGG AS | 932695030 | TRONDHEIM |
| ATOM ELEKTRO AS | 893022392 | OSLO |
| ATOM RØRLEGGERBEDRIFTS AS | 924201746 | BÆRUM |
| ATP ARKITEKTER AS | 897489422 | OSLO |
| ATRACK ENTREPRENØR AS | 983380921 | LIER |
| ATRI BYGGPROSJEKTERING AS | 957563104 | SARPSBORG |
| AT RØRTEK AS | 936233791 | KINN |
| ATT ARKITEKTUR AS | 933210596 | OSLO |
| ATVB MONTASJE AS | 933022609 | BÆRUM |
| AUDEN SENDERUD GRAVEMASKINDRIFT AS | 979940084 | ELVERUM |
| AUDUN NORDBØ AS | 925732826 | KVITSØY |
| AUENSEN MASKINENTREPRENØR AS | 997890930 | HALDEN |
| AUGLA AS | 932373009 | STEINKJER |
| AUKE RØR AS | 813458942 | NITTEDAL |
| AUNE BYGG & VVS AS | 933568512 | BJØRNAFJORDEN |
| AUNE MASKIN AS | 997020332 | MIDTRE GAULDAL |
| AURLAND ELEKTRISKE AS | 929008596 | AURLAND |
| AURLIEN AS | 994264427 | VOLDA |
| AURSKOG BYGG AS | 993979732 | AURSKOG-HØLAND |
| AURSKOG ELEKTRISKE INSTALLASJON AS | 918595317 | AURSKOG-HØLAND |
| AURSKOG VENTILASJON OG BLIKKENSLAGERVERKSTED AS | 934907817 | AURSKOG-HØLAND |
| AURSTAD AS | 885349552 | ØRSTA |
| AURVOLL OG FURESUND AS | 882937402 | HERØY (MØRE OG ROMSDAL) |
| 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 |
| AVARN SECURITY TEKNIKK SØR AS | 979276141 | TØNSBERG |
| AVARTEKT AS | 916583907 | DRAMMEN |
| AVE SYSTEMER AS | 997812905 | HÅ |
| AVITELL AS | 910405004 | KRISTIANSAND |
| AVLØP OG UTEMILJØ AS | 918834729 | SKAUN |
| A. VOLD ARKITEKTUR AS | 933464563 | HAMAR |
| AVRA RØR AS | 911577844 | OSLO |
| AVSHOP AS | 988897833 | OSLO |
| AV SPRINKLER AS | 918717560 | INDRE ØSTFOLD |
| AV TAKST & CONSULT Arild Leif Valle | 985685983 | ÅLESUND |
| A. WAAGE BYGG AS | 925747173 | AUSTRHEIM |
| 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 |
| BAAR-DAHL RØRSERVICE AS | 937006217 | SANDEFJORD |
| BAARDSEN ARKITEKTER AS | 931754270 | LILLESAND |
| 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 |
| BACKE SØR AS | 930656526 | KRISTIANSAND |
| BACKE STOR-OSLO AS | 910380044 | BÆRUM |
| BACKE TRONDHEIM AS | 952228609 | TRONDHEIM |
| BACKE VESTFOLD TELEMARK AS | 914821606 | SANDEFJORD |
| BACKLUND & SØNN AS | 935763614 | ÅLESUND |
| BAD & BYGG PARTNER AS | 995933853 | ÅS |
| BAD & BYGG VVS OSLO AS | 834928892 | OSLO |
| BADEROMSPAKKEN AS | 931542672 | LILLESTRØM |