 | WATNCONSULT AS | 915679110 | TRONDHEIM |
| WATZEK BYGG WACLAW SLIWA | 990972338 | BÆRUM |
| WAX HUS AS | 971220953 | DRAMMEN |
| W&B ARKITEKTER AS | 847647132 | FÆRDER |
| WB. BYGG KOMPETANSE AS | 928706869 | FROGN |
| WBL AS | 914110653 | ØRLAND |
| WEBERG AS | 928785890 | OSLO |
| WEDDES RØRSERVICE AS | 998517915 | NÆRØYSUND |
| WEDUM & CO AS | 981187601 | GAUSDAL |
| WEDUM ELEKTRO AS | 982921554 | LILLEHAMMER |
| WEENBO PROSJEKTLEDELSE AS | 996546969 | ULLENSAKER |
| WEGLO DESIGN, PLAN & LANDSKAP AS | 993814946 | BERGEN |
| WEIDER RØR AS | 994079867 | NAMSOS |
| WEL-BYGG AS | 975336468 | VESTBY |
| WELHAVEN RØR OG ELEKTRO AS | 925847097 | LIER |
| WELTZ PROSJEKTLEDELSE AS | 993148962 | OSLO |
| WENCHE MEYER-OLSEN ARKITEKTKONTOR | 986167862 | BÆRUM |
| 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 |
| WEST ELEKTRO AS | 956889057 | KRISTIANSUND |
| 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 |
| WEUM RØRSERVICE AS | 976530195 | DRAMMEN |
| WHITE ARKITEKTER AB | 997021924 | OSLO |
| WICKSTRØM AS | 980404285 | VADSØ |
| WIDAR LINDGREN TRANSPORT AS | 989323237 | SKIEN |
| WIEN BYGG AS | 918848053 | NORDRE LAND |
| WIGGEN VVS AS | 994347896 | TRONDHEIM |
| WIIK ENTREPRENØR AS | 917367612 | SANDEFJORD |
| 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 |