 | 24/7 RØRLEGGERVAKTEN AS | 926819828 | OSLO |
| 2 RØRLEGGERE AS | 986512551 | OSLO |
| 3S BYGG AS | 923273891 | OSLO |
| 4B ARKITEKTER AS | 921934092 | OSLO |
| 90 GRADER AS | 928470679 | OSLO |
| AABERG EIENDOMSDRIFT AS | 994066072 | OSLO |
| AANERUD ENTREPRENØR AS | 966168838 | OSLO |
| A-ARK AS | 921897782 | OSLO |
| AARSRUD BYGG AS | 931151053 | OSLO |
| AART ARCHITECTS NO AS | 879423392 | OSLO |
| AASE PROSJEKT AS | 990238316 | OSLO |
| ABC RØR AS | 948744805 | OSLO |
| ABILDSØ ELEKTRISKE AS | 937794878 | OSLO |
| ABSOLUTT RØRSERVICE Terje Vidar Rød | 883846532 | OSLO |
| ACCIONA CONSTRUCCION S.A. | 914890519 | OSLO |
| ACT! AS | 926934481 | OSLO |
| ADAM BYGG AS | 922036896 | OSLO |
| ADD ARKITEKTER AS | 979497997 | OSLO |
| AD OPPUSSING AS | 916619766 | OSLO |
| ADVANSIA AS | 883889762 | OSLO |
| AF DECOM AS | 992097442 | OSLO |
| AF ENERGI AS | 983480535 | OSLO |
| AF GRUPPEN NORGE AS | 938333572 | OSLO |
| AFRY NORWAY AS | 915229719 | OSLO |
| AGNAR BERGO AS | 912723038 | OSLO |
| AGS BYGG AS | 998736226 | OSLO |
| A. HANSEN GRUPPEN AS | 963544731 | OSLO |
| A. HOKHOLT ARKITEKTER AS | 989388061 | OSLO |
| AIM DESIGN AS | 968140329 | OSLO |
| AJL - ANDRESEN, JACOBSEN & LØYNING AS | 988427047 | OSLO |
| AK1 ELEKTRO AS | 922021791 | OSLO |
| AKER RØRLEGGERBEDRIFT AS | 961109515 | OSLO |
| AKER RØRSERVICE AS | 929643143 | OSLO |
| AKERSHUS ELEKTRO AS | 976527569 | OSLO |
| AK-GRUPPEN AS | 932121549 | OSLO |
| AKSJESELSKAPET ELEKTRO GRUPPEN | 989373560 | OSLO |
| AKTIV BYGG AS | 882457672 | OSLO |
| A-LAB AS | 982165105 | OSLO |
| AL ELEKTRO AS | 915078990 | OSLO |
| ALFA OG OMEGA BYGG AS | 923594876 | OSLO |
| ALFA OLIS GASS & VVS AS | 885415962 | OSLO |
| ALL10 ENTREPRENØR AS | 923594361 | OSLO |
| ALLIANCE ARKITEKTURSTUDIO AS | 988437433 | OSLO |
| ALLIERO AS | 980920569 | OSLO |
| ALNA ELEKTRO AS | 917290970 | OSLO |
| ALRØR SERVIS VVS ALEKS CARKAJ | 923544798 | OSLO |
| ALT.ARKITEKTUR AS | 989622943 | OSLO |
| ALTIPLAN AS | 914864585 | OSLO |
| ALTMULIGGUTTA TOTALREHABILITERING AS | 987972610 | OSLO |
| AMDAHL STRØM & CAPPELEN ARKITEKTER AS | 974227932 | OSLO |