 | NH MELHUSBYGG AS | 891111932 | MELHUS |
| NIC JACOBSEN ENTREPRENØR AS | 959524297 | ASKØY |
| NICO BLIKK & TAK AS | 913146212 | KRISTIANSAND |
| NICOLAYSEN ANLEGG OG TRANSPORT AS | 964694583 | RÅDE |
| NICOLE TORGERSEN RÅDGIVNING AS | 933580598 | MODUM |
| NIDAROS BYGGKOMPETANSE AS | 918629025 | TRONDHEIM |
| NIDAROS GLASS OG MONTASJE AS | 825194282 | TRONDHEIM |
| NIDAROS MURSYSTEM AS | 916320191 | SKAUN |
| NIDAROS OPPMÅLING AS | 984430299 | TRONDHEIM |
| NIDARVOLL BYGGSERVICE AS | 992893079 | TRONDHEIM |
| NIDELVEN BYGG AS | 913732979 | TRONDHEIM |
| NIDER AS | 930761737 | FREDRIKSTAD |
| NIELSEN CONSULT AS | 935269253 | NORDREISA |
| NIELS TORP+ ARKITEKTER AS | 922748705 | OSLO |
| NIKLAS ERIKSEN AS | 826676892 | AURSKOG-HØLAND |
| NIKOLAISEN MASKIN AS | 934380312 | HOLE |
| Nils Aksnes & Co AS | 931669559 | KVAM |
| NILS BROEN | 977098254 | ELVERUM |
| NILS BURUM | 976052153 | ÅS |
| NILSENBYGG EIENDOM AS | 991780939 | BAMBLE |
| NILSEN & CO AS | 921260296 | GRIMSTAD |
| NILSEN ELEKTRO AS | 956338948 | HORTEN |
| NILSEN FLIS OG HÅNDVERKSERVICE AS | 920438504 | BODØ |
| NILSEN HARRY A | 970337954 | RANA |
| NILSEN MASKIN AS | 874433292 | VEGÅRSHEI |
| NILSEN & STURE BETONG AS | 986481729 | ASKØY |
| NILSEN VENTILASJON AS | 995234548 | ARENDAL |
| NILSEN VVS AS | 913509811 | ASKØY |
| NILS INGE TJELTA AS | 863233062 | SOLA |
| NILS JR FREY | 970326170 | KRISTIANSUND |
| NILS KALDAHL ANLEGG & TRANSPORT AS | 886833172 | NAMSOS |
| NILS LØFF AS | 983976956 | KONGSBERG |
| NILS OMA MASKIN AS | 920734170 | TIME |
| NILS REIME MASKIN AS | 987709111 | HÅ |
| NILSSON AS | 983494226 | BODØ |
| NILSSON HARAS AS | 919546646 | SORTLAND |
| NILSSON MO AS | 986444327 | RANA |
| NILS TORE AAMODT | 970156097 | HAMAR |
| NIMBUS GOTELE AS | 895204862 | OSLO |
| NINO RØRLEGGER AS | 923843175 | OSLO |
| NIPEDAL TAK OG MEMBRAN AS | 932481588 | VENNESLA |
| NITTEDAL RØRLEGGERBEDRIFT AS | 916998767 | LILLESTRØM |
| NIVAA AS | 835781372 | OSLO |
| NIVÅBYGG AS | 919290757 | LILLESTRØM |
| NJS BYGGSERVICE AS | 916538235 | RINGERIKE |
| NK ENTREPRENØR AS | 821095352 | OSLO |
| NL ARKITEKTUR AS | 931120174 | RINGERIKE |
| NLI ELEKTROSYSTEMER AS | 989042335 | TØNSBERG |
| NLI ENGINEERING AS | 887994722 | TØNSBERG |
| NMC RØRSERVICE AS | 933639711 | OSLO |
| NM RØR AS | 996798011 | OSLO |
| NMS EIENDOM BERGEN AS | 922179611 | BERGEN |
| NO ARKITEKTER AS | 935632625 | OSLO |
| NOA VVS AS | 915448941 | STORD |
| NOBEL RØR INSTALLASJON AS | 992139633 | VÅGAN |
| NOBERG ENTREPRENØR AS | 935338077 | ULLENSAKER |
| NOBI BYGG OG BETONG AS | 931491865 | VOSS |
| NO BYGG AS | 814968502 | SKIEN |
| NODDELAND BYGG | 984607245 | FROLAND |
| NODE RÅDGIVENDE INGENIØRER AS | 919853557 | BERGEN |
| NO DIG VESTFOLD AS | 921359721 | LARVIK |
| NOG ENTREPRENØR AS | 930512524 | VOLDA |
| NØKKEL-FERDIG DRIFT AS | 933592499 | HOLMESTRAND |
| NØKLAND BYGGSERVICE | 933617882 | LINDESNES |
| NØKLAND RØRLEGGERSERVICE AS | 915514758 | LYNGDAL |
| NOLA HUS AS | 998501288 | TRONDHEIM |
| NOMELAND MASKIN AS | 988044946 | VALLE |
| NOPEK ELEKTRO AS | 968958356 | LIER |
| NORACTOR AS | 930846589 | LILLESTRØM |
| NORALF REILSTAD | 970386203 | STAVANGER |
| NOR-ANDREW BYGG AS | 924542705 | MOSS |
| NORAVIND BYGG AS | 928823695 | ØYGARDEN |
| NORAX TYNSET AS | 984697082 | TYNSET |
| NORBECK ENTREPRENØR AS | 933455211 | OPPDAL |
| NORBYGG AS | 923728902 | SARPSBORG |
| NORBYGG TRONDHEIM AS | 920335772 | TRONDHEIM |
| NORCONSULT NORGE AS | 962392687 | BÆRUM |
| NORDAL BYGG AS | 936957781 | GLOPPEN |
| NORDAL BYGGSERVICE AS | 917698953 | TØNSBERG |
| NORDAL MASKIN AS | 990800421 | LOM |
| NORDAN RUBICON AS | 971112298 | KLEPP |
| NORD ARKITEKTUR AS | 986692959 | BÆRUM |
| NORDÅS BETONGFORM AS | 917109524 | EIGERSUND |
| NORDASFALT AS | 950501480 | BODØ |
| NORDÅS TØMRERSERVICE AS | 922339090 | VEFSN |
| NORDAVIND ARKITEKTUR AS | 924489235 | TRONDHEIM |
| NORDBÆK BYGG AS | 820978382 | OSLO |
| NORDBALTIC AS | 935329167 | ÅLESUND |
| NORD-BERG AS | 959618267 | ULSTEIN |
| NORDBØ BYGG AS | 912792730 | STAVANGER |
| NORDBOHUS ASKER OG BÆRUM AS | 979222793 | ASKER |
| NORDBOHUS BYGGSERVICE AS | 838064132 | VERDAL |
| NORDBOHUS INNLANDET AS | 996600319 | GJØVIK |
| NORDBOHUS KONGSVINGER AS | 969041006 | KONGSVINGER |
| NORDBOHUS MODUM AS | 989717588 | MODUM |
| NORDBOHUS ROMERIKE AS | 921744099 | LILLESTRØM |
| NORDBOHUS SKIEN AS | 934541715 | SKIEN |
| NORDBOHUS SOGN AS | 982725216 | SOGNDAL |
| NORDBOHUS TG BYGG AS | 913459555 | TYSVÆR |
| NORDBØ MASKIN AS | 969042088 | ASKER |