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| WALDELAND & VARHAUG AS | 979924313 | HÅ |
| WALHEIM AS | 992078626 | GJØVIK |
| WALLAX AS | 960356705 | BÆRUM |
| WALLENTIN AS | 916072600 | SARPSBORG |
| WALLIN BYGG & EIENDOM AS | 932328992 | RAUMA |
| WALLØE & NILSEN AS | 929114779 | BERGEN |
| WALTER WILHELMSEN AS | 970904468 | TROMSØ |
| WALTHER KARPPINEN & SØNN AS | 913336429 | TØNSBERG |
| WALTHER SÆTHRE & CO AS | 983632963 | SOGNDAL |
| WANDSVIK ROAR | 970538992 | LEVANGER |
| WANGBERG VVS AS | 957474292 | TRONDHEIM |
| WARI HUS AS | 925621897 | GRIMSTAD |
| WARLOFF FJELLSPRENGING AS | 996884309 | ØVRE EIKER |
| WARMBRODT VVS AS | 994501267 | LINDESNES |
| 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 |