 | AL KRISTIANSUND BOLIGBYGGELAG | 948394928 | KRISTIANSUND |
| ALL10 ENTREPRENØR AS | 923594361 | STAVANGER |
| ALLBYGG AS | 918709363 | BERGEN |
| ALLBYGG FLORØ AS | 979953852 | KINN |
| ALLFUG AS | 942322704 | GJESDAL |
| ALLIERO AS | 980920569 | OSLO |
| ALL-RØR AS | 978653677 | TRONDHEIM |
| ALL-RØRFORNYING AS | 923994750 | TRONDHEIM |
| ALL SERVICE BREIM AS | 928573745 | GLOPPEN |
| ALLSIDIG ARKITEKT AS | 916544987 | TRONDHEIM |
| ALLSIDIG BYGG AS | 916635400 | MOLDE |
| ALLSIDIGE VVS AS | 975349128 | RÆLINGEN |
| ALLSTAD AS | 934006127 | OSLO |
| ALLTAK AS | 816561892 | LØRENSKOG |
| ALLTID MILJØ AS | 924861363 | RÆLINGEN |
| ALLUM BYGG AS | 944485368 | LARVIK |
| ALLUM TRANSPORT AS | 858041732 | SILJAN |
| ALMAAS & SVEDAHL BYGGEFIRMA AS | 913856732 | TRONDHEIM |
| ALMA EIK AS | 998876605 | KRISTIANSAND |
| ALMÅS BYGG OG SNEKKERSERVICE | 814401332 | SANDEFJORD |
| ALMÅS MASKIN AS | 951843741 | MIDTRE GAULDAL |
| ALMEDALS RØRSERVICE AS | 924413964 | KRISTIANSAND |
| ALNA ELEKTRO AS | 917290970 | OSLO |
| ALNA RØR AS | 927075024 | LILLESTRØM |
| ALP BYGG AS | 919188111 | KONGSBERG |
| ALPHA ARKITEKTER AS | 976019474 | ARENDAL |
| ALPHA CONSULT AS | 920259472 | STORD |
| ALPHA ELEKTRO AS | 915767362 | NITTEDAL |
| ALPHA ENTREPRENØR AS | 922185239 | NORDRE FOLLO |
| ALPHA RØR SERVICE AS | 935174910 | LILLESTRØM |
| ÅL RØRSERVICE AS | 935894204 | ÅL |
| ALSAKER FJORDBRUK AS | 979494009 | TYSNES |
| ALSAKER STÅL AS | 930405361 | ASKØY |
| ALSTAD ENTREPRENØR AS | 912177211 | STEINKJER |
| ALSTAD MASKIN AS | 915920918 | BODØ |
| ALSTAD PUKK AS | 929417399 | HEIM |
| ALSTEN MASKINSTASJON AS | 959260494 | ALSTAHAUG |
| ALTA BYGGSERVICE AS | 920364667 | ALTA |
| ALTA EL AS | 978632408 | ALTA |
| ALTA GRAVESERVICE AS | 934264398 | ALTA |
| ALT.ARKITEKTUR AS | 989622943 | OSLO |
| ALT A RØR AS | 987216549 | ALTA |
| ALTA STÅL & CNC MASKINERING AS | 993866296 | ALTA |
| ALTBYGG AS | 998742803 | BERGEN |
| ALT HEIS AS | 922758832 | BERGEN |
| ALT I ASFALT AS | 995676605 | GJERDRUM |
| ALTI-EL AS | 928736970 | KONGSBERG |
| ALTIMUR AS | 917145369 | RÅDE |
| ALT INSTALLASJON AS | 979384378 | TØNSBERG |
| ALTIPLAN AS | 914864585 | OSLO |
| ALT I RØR AS | 935000548 | BERGEN |
| ALT KAN MALES AS | 926697080 | ASKER |
| ALT RØRLEGGER & VAKTMESTER AS | 925597260 | HORTEN |
| ALUMINIUM FASADER AS | 975980596 | LARVIK |
| ALU-SERVICE AS | 911574462 | NANNESTAD |
| ALUTEC AS | 941935400 | BJØRNAFJORDEN |
| ALVDAL BYGG AS | 977301890 | ALVDAL |
| ALVDAL GRAVESERVICE AS | 988414352 | TYNSET |
| ALVDAL RØR AS | 918359303 | ALVDAL |
| ALVDAL TAKST AS | 893784292 | ALVDAL |
| ALVER ELEKTRO AS | 928901548 | ALVER |
| ALVER FLIS AS | 933176215 | ALVER |
| ALVER MUR & BYGG AS | 937065086 | ALVER |
| ALVERSUND MASKINSTASJON AS | 937664044 | ALVER |
| ALVØEN SERVICE AS | 918864741 | BERGEN |
| ÄLVSBYHUS NORGE AS | 975955885 | MOSS |
| A MARKUSSEN AS | 835000702 | NARVIK |
| AMBER BYGG AS | 927533146 | INDRE ØSTFOLD |
| AM BYGG AS | 989557580 | ÅFJORD |
| AMDAHL STRØM & CAPPELEN ARKITEKTER AS | 974227932 | OSLO |
| AMDAL ELEKTRO AS | 982122996 | OVERHALLA |
| ÅMDAL MASKIN AS | 990059624 | ØRSTA |
| A-MEMBRAN AS | 998823951 | OSLO |
| AMK BYGG AS | 922660492 | ASKER |
| ÅMLI BYGG AS | 989110233 | ÅMLI |
| AM MUR OG BETONG AS | 930283886 | FREDRIKSTAD |
| AMTEDAL & HANSEN ARKITEKTKONTOR AS | 982193664 | KRISTIANSAND |
| AMUNDSEN BYGG AS | 928625788 | BAMBLE |
| AMUNDSEN TAKST AS | 989658034 | ASKER |
| AMUND VOLEHAUGEN | 898811352 | NORDRE LAND |
| A. M. VIK AS | 977458412 | VANYLVEN |
| A NAGEL ALNE AS | 942265344 | VINDAFJORD |
| A-N-B BYGG AS | 824774692 | BERGEN |
| ANBUDSBYGG.NO DØNNESSEN | 996466485 | ULLENSAKER |
| AN BYGG AS | 997425103 | NANNESTAD |
| ANDÅS BYGG AS | 919441992 | KRISTIANSAND |
| ANDÅS RØR AS | 986085882 | KRISTIANSAND |
| ANDBERG-MOUM AS | 925342831 | OSLO |
| ANDENÆS VVS AS | 963031130 | OSLO |
| ANDERSEN BAD & BOLIG AS | 925193860 | OSLO |
| ANDERSEN & BAKKE ENTREPRENØRFORRETNING AS | 957875580 | FÆRDER |
| ANDERSEN BYGGTEKNISK KONSULENT | 933590046 | TRONDHEIM |
| ANDERSEN FONTANA AS | 848049182 | ASKER |
| ANDERSEN & KNOPH AS | 915987915 | SANDEFJORD |
| ANDERSEN & LJOSHEIM BYGG AS | 998737133 | BERGEN |
| ANDERSEN OG AKSNES RØRLEGGERBEDRIFT AS | 911978261 | ASKER |
| ANDERSEN OG HOFSLUNDSENGEN BYGG AS | 980694437 | SOGNDAL |
| ANDERSEN OG LARSEN RØRLEGGERBEDRIFT AS | 915223907 | OSLO |
| ANDERSEN & SØNN RØRLEGGERFORRETNING AS | 942032846 | ASKØY |
| ANDERS & FRODE BYGG AS | 997655753 | TRYSIL |