 | 24/7 KJØLEVAKTEN AS | 934047419 | OSLO |
| 24/7 RØRLEGGERVAKTEN AVD ØSTFOLD AS | 931077309 | OSLO |
| 3S BYGG AS | 923273891 | OSLO |
| 4B ARKITEKTER AS | 921934092 | OSLO |
| 90 GRADER AS | 928470679 | OSLO |
| AABERG EIENDOMSDRIFT AS | 994066072 | 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 ARKITEKTUR AS | 997912454 | OSLO |
| ABV GRUPPEN AS | 933499014 | OSLO |
| ACT! AS | 926934481 | OSLO |
| ADD ARKITEKTER AS | 979497997 | OSLO |
| ADR ELEKTRO AS | 995981661 | OSLO |
| AF DECOM AS | 992097442 | OSLO |
| AF ENERGI AS | 983480535 | OSLO |
| AF GRUPPEN NORGE AS | 938333572 | OSLO |
| AFRY NORWAY ADVISORY AS | 883889762 | OSLO |
| AFRY NORWAY AS | 915229719 | OSLO |
| AGILITEK AS | 834310252 | OSLO |
| AGNAR BERGO AS | 912723038 | OSLO |
| AGS BYGG AS | 998736226 | OSLO |
| A. HANSEN GRUPPEN AS | 963544731 | OSLO |
| AIP MASKIN AS | 928857964 | OSLO |
| AIR-TECH AS | 889558652 | OSLO |
| AK1 ELEKTRO AS | 922021791 | OSLO |
| AKERSHUS ELEKTRO AS | 976527569 | OSLO |
| AK-GRUPPEN AS | 932121549 | OSLO |
| AKSELL AS | 919996013 | 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 |
| ALLIERO AS | 980920569 | OSLO |
| ALLSTAD AS | 934006127 | OSLO |
| ALNA ELEKTRO AS | 917290970 | OSLO |
| ALT.ARKITEKTUR AS | 989622943 | OSLO |
| ALTIPLAN AS | 914864585 | OSLO |
| ALTMULIGGUTTA TOTALREHABILITERING AS | 987972610 | OSLO |
| AMDAHL STRØM & CAPPELEN ARKITEKTER AS | 974227932 | OSLO |
| A-MEMBRAN AS | 998823951 | OSLO |
| ANDBERG-MOUM AS | 925342831 | OSLO |
| ANDENÆS VVS AS | 963031130 | OSLO |
| ANDERSEN BAD & BOLIG AS | 925193860 | OSLO |
| ANDERSEN OG LARSEN RØRLEGGERBEDRIFT AS | 915223907 | OSLO |
| ANDERS JOHNSEN AS | 934195698 | OSLO |
| ANDERS STIEN AS | 913350162 | OSLO |
| ANDREAS OG SØNN EXPRESS AS | 999086594 | OSLO |
| ANDRESEN OG SØNN AS | 985169136 | OSLO |
| ANNO STUDIO FOR ARKITEKTUR DESIGN OG LANDSKAPSFORMING SIVILARKITEKTER ANS | 941680224 | OSLO |
| APRIL ARKITEKTER AS | 910279009 | OSLO |
| AQUACONSULT AS | 933746623 | OSLO |
| AQUARIUS RØRLEGGERBEDRIFT AS | 992887397 | OSLO |
| AQUARØR AS | 995799715 | OSLO |
| ARA RØR AS | 930335967 | OSLO |
| ARCHI BYGG AS | 915137083 | OSLO |
| ARCHITECTOPIA AS | 997993381 | OSLO |
| ARCHUS ARKITEKTER AS | 943864306 | OSLO |
| ARCON ENTREPRENØR AS | 924771232 | OSLO |
| ARK 19 ARKITEKTKONTOR AS | 978641148 | OSLO |
| ARKITEKT ALBJERK AS | 913405900 | OSLO |
| ARKITEKT ARNE SØDAL | 970309896 | OSLO |
| ARKITEKT AS | 918703330 | OSLO |
| ARKITEKTENE AS | 910242598 | OSLO |
| ARKITEKTENE ASTRUP OG HELLERN AS | 945479965 | OSLO |
| ARKITEKTENE MNAL FOSSE OG AASEN AS | 962385915 | OSLO |
| ARKITEKTGRUPPEN LILLE FRØEN AS | 942100310 | OSLO |
| ARKITEKT HAGEN | 825186212 | OSLO |
| ARKITEKTKONTORET ANNE GRETE SOLSTAD AS | 979867530 | OSLO |
| Arkitektkontoret GASA AS | 940952662 | OSLO |
| ARKITEKTKONTORET LENE FRANK AS | 976006941 | OSLO |
| ARKITEKT LARS LARSEN AS | 920988768 | OSLO |
| ARKITEKT MNAL Ingar Hjelmberg | 979991037 | OSLO |
| Arkitektskap AS | 938214042 | OSLO |
| ARKITEMA AS | 943857644 | OSLO |
| AS Bygghåndverk | 938336776 | OSLO |
| ASC EIENDOMSUTVIKLING AS | 992480645 | OSLO |
| ÅSGÅRD RØR OG ENERGI AS | 928177912 | OSLO |
| ASK ENTREPRENØR AS | 926570897 | OSLO |
| ASKIM LANTTO ARKITEKTER MNAL AS | 980442047 | OSLO |
| AS LINNES | 941870600 | OSLO |
| ASPIRA AS | 916718969 | OSLO |
| AS REALBYGG | 950525932 | OSLO |
| AS RØRLEGGER | 815589602 | OSLO |
| ASSEMBLIN AS | 965808752 | OSLO |
| ASTAD ARKITEKTUR AS | 920575307 | OSLO |
| AT CONSULT LARISA KARTASHEVA | 915712754 | OSLO |
| ATEAM INNEKLIMASERVICE AS | 982175577 | OSLO |
| ATELIER OSLO AS | 994734938 | OSLO |
| ATLAS BYGG AS | 835032302 | OSLO |
| ATOM ELEKTRO AS | 893022392 | OSLO |
| ATP ARKITEKTER AS | 897489422 | OSLO |
| ATT ARKITEKTUR AS | 933210596 | OSLO |
| AUTOMATIKK MONTASJE AS | 933144178 | OSLO |
| AVRA RØR AS | 911577844 | OSLO |