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| WELTZ PROSJEKTLEDELSE AS | 993148962 | OSLO |
| WENCHE MEYER-OLSEN ARKITEKTKONTOR | 986167862 | BÆRUM |
| WENT AIR SOLUTIONS AS | 933190293 | STORD |
| WERNER BARTH BADEMILJØ AS | 976148983 | SANDEFJORD |
| WESEK BYGG ZBIGNIEW WESEK | 897254662 | LILLESTRØM |
| WESPI AS | 911914298 | SENJA |
| WESSEL ENTREPRENØR AS | 991422110 | AURE |
| WESTAD MASKIN | 879951682 | AVERØY |
| WESTGAARD FRANK | 970223657 | NORDRE FOLLO |
| WESTGAARD VVS AS | 827493562 | INDRE ØSTFOLD |
| WEST INDUSTRI SERVICE AS | 980034852 | KINN |
| WESTRA ENGINEERING AS | 977558395 | BÆRUM |
| WEST-TEAM AS | 993369993 | BERGEN |
| WETHAL ELEKTROENTREPRENØR AS | 984802730 | OSLO |
| WETTERGREN FASADE AS | 964864683 | OSLO |
| WHITE ARKITEKTER AB | 997021924 | OSLO |
| WIDAR LINDGREN TRANSPORT AS | 989323237 | SKIEN |
| WIEN BYGG AS | 918848053 | NORDRE LAND |
| WIGGEN VVS AS | 994347896 | TRONDHEIM |
| WIIK ENTREPRENØR AS | 917367612 | SANDEFJORD |
| WILHELMSEN ARKITEKTUR | 995069466 | STAVANGER |
| WILHELMSEN MUR & FLIS AS | 927387379 | BERGEN |
| WILH. KOLSTAD AS | 928972658 | DRAMMEN |
| WILLY HESTØ | 969602881 | NÆRØYSUND |
| WILLY MELBYE AS | 928644960 | EIDSKOG |
| WILSKOG BYGG AS | 989921320 | NITTEDAL |
| WILSON EIENDOM AS | 899020642 | FROGN |
| WINCON AS | 922687048 | LILLESAND |
| WINGE GRAVESERVICE AS | 920038964 | VÅLER (ØSTFOLD) |
| WINGEREID MASKIN AS | 923110186 | DRANGEDAL |
| WINGES SERVICE AS | 998100178 | FROSTA |
| WINSNES AS | 922043973 | MIDTRE GAULDAL |
| WISLAN RØR AS | 999104355 | NORDRE FOLLO |
| WITSØ MASKIN AS | 979952228 | HEIM |
| WK ENTREPRENØR AS | 980535053 | TØNSBERG |
| W.M. BYGG Wojciech Tomasz Marcinek | 986923659 | OSLO |
| WOJTEK BYGG RENOVERING AS | 996644324 | VESTBY |
| WOLDEN BYGG AS | 922601674 | ORKLAND |
| WOLDENGEN AS | 925700657 | OSLO |
| WOLDEN MASKIN AS | 989077279 | BODØ |
| WOLLVIK AS | 921792697 | EIDSVOLL |
| WOOD ARKITEKTUR + DESIGN AS | 996454819 | OSLO |
| WOODCON AS | 812177192 | RINGSAKER |
| WOODSTOCK NATURLIGE BYGG AS | 826644222 | FROGN |
| WOODSTYLE AS | 925877115 | FROGN |
| WORKINN AS | 966432578 | TROMSØ |
| WORKMAN AS | 997306503 | OSLO |
| WR MASKIN AS | 889195452 | ÅMOT |
| WS MASKIN OG EIENDOM AS | 932384027 | ASKØY |