 | 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 |
| WARI HUS AS | 925621897 | GRIMSTAD |
| WARLOFF FJELLSPRENGING AS | 996884309 | ØVRE EIKER |
| WARMBRODT VVS AS | 994501267 | LINDESNES |
| WATNCONSULT AS | 915679110 | TRONDHEIM |
| WAX HUS AS | 971220953 | DRAMMEN |
| 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 |
| WEIDER RØR AS | 994079867 | NAMSOS |
| WEL-BYGG AS | 975336468 | VESTBY |
| WELDONE AS | 989127624 | SAUDA |
| WELHAVEN BYGG AS | 927402262 | LIER |
| WELHAVEN RØR OG ELEKTRO AS | 925847097 | ASKER |
| WELTZ PROSJEKTLEDELSE AS | 993148962 | OSLO |
| WENCHE MEYER-OLSEN ARKITEKTKONTOR | 986167862 | HALDEN |
| 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 |
| WESTLAND VVS AS | 933242234 | ALVER |
| WESTRA ENGINEERING AS | 977558395 | BÆRUM |
| WEST-TEAM AS | 993369993 | BERGEN |
| WETHAL ELEKTROENTREPRENØR AS | 984802730 | OSLO |
| WETTERGREN FASADE AS | 964864683 | OSLO |
| WIDAR LINDGREN TRANSPORT AS | 989323237 | SKIEN |
| WIEN BYGG AS | 918848053 | NORDRE LAND |
| WIERSHOLM BYGG | 997946456 | SARPSBORG |
| WIGGEN VVS AS | 994347896 | TRONDHEIM |
| 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 |
| WK POL BYGG AS | 920883478 | GRAN |
| 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 |
| WOODSTOCK NATURLIGE BYGG AS | 826644222 | FROGN |
| WOODSTYLE AS | 925877115 | FROGN |
| WOODWORKS AS | 830176152 | INDRE ØSTFOLD |
| WORKINN AS | 966432578 | TROMSØ |
| WORKMAN AS | 997306503 | OSLO |
| WR MASKIN AS | 889195452 | ÅMOT |
| WS MASKIN OG EIENDOM AS | 932384027 | ASKØY |
| WS MASKIN & TRANSPORT AS | 984337647 | HARSTAD |
| WSP NORGE AS | 881894742 | OSLO |
| WT BYGG AS | 915855849 | LØRENSKOG |
| WWRØRLEGGER AS | 834137852 | ULLENSAKER |
| WWW.KONSTRUKSJON.COM TØRSET | 987032758 | SKAUN |
| X5 ELEKTRO AS | 979705883 | ALTA |
| X BETONG AS | 912156494 | ÅLESUND |
| XBO EIENDOMSUTVIKLING AS | 927716232 | STAVANGER |
| XBYGG V/LUND | 919798262 | FARSUND |
| XFORM AS | 992186909 | SUNNFJORD |
| XK ENTREPRENØR AS | 995109409 | OSLO |
| XL-BYGG MATHISEN & CO AS | 997645359 | ALTA |
| XPERT INSTALLASJON AS | 981574036 | TØNSBERG |
| XPLAN AS | 934995260 | ÅLESUND |
| XTM DESIGN AS | 924119039 | ÅLESUND |
| XYLEM WATER SOLUTIONS NORGE AS | 918088067 | LILLESTRØM |
| YC AMUNDRUD AS | 925552550 | ELVERUM |
| YDSTEBØ BYGGTJENESTER AS | 914800919 | KVITSØY |
| YJ BYGG AS | 930871575 | ASKØY |
| YM CONSULT AS | 823242832 | OSLO |
| YMRO AS | 927210142 | OSLO |
| YOUNG AS | 990650705 | ÅLESUND |
| YRAN & DAHLE ARKITEKTER AS | 926515608 | OSLO |
| YR ARKITEKTER AS | 818946422 | BERGEN |
| YSSEN AS | 898803902 | LILLESTRØM |
| YTRELAND AS | 933731855 | KARMØY |
| YTTERDAHL AS | 929572912 | FARSUND |
| YTTERLI MASKIN AS | 829513722 | RAUMA |