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| NIDARVOLL BYGGSERVICE AS | 992893079 | TRONDHEIM |
| NIDELVEN BYGG AS | 913732979 | TRONDHEIM |
| NIDER AS | 930761737 | FREDRIKSTAD |
| NIELS TORP+ ARKITEKTER AS | 922748705 | OSLO |
| NIKLAS ERIKSEN AS | 826676892 | AURSKOG-HØLAND |
| Nils Aksnes & Co AS | 931669559 | KVAM |
| NILS BURUM | 976052153 | ÅS |
| NILSEN BYGG | 970043950 | BAMBLE |
| 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 & SOLBERG BYGGSERVICE AS | 913150848 | BERGEN |
| 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 FIBER AS | 895204862 | OSLO |
| NINO RØRLEGGER AS | 923843175 | OSLO |
| NIPEDAL TAK OG MEMBRAN AS | 932481588 | VENNESLA |
| NIRO BYGG AS | 927328852 | VERDAL |
| NITEK AS | 983437273 | ALTA |
| NITREX AS | 991853529 | SALTDAL |
| NITTEDAL RØRLEGGERBEDRIFT AS | 916998767 | LILLESTRØM |
| NIVÅBYGG AS | 919290757 | OSLO |
| NJÆRHEIM RØR AS | 996324958 | SANDNES |
| NJS BYGGSERVICE AS | 916538235 | RINGERIKE |
| NK PRO BYGG AS | 898632032 | KRISTIANSUND |
| NKTR HOLDING AS | 922529116 | MODUM |
| NL ARKITEKTUR AS | 931120174 | RINGERIKE |
| NLI ELEKTROSYSTEMER AS | 989042335 | TØNSBERG |
| NLI ENGINEERING AS | 887994722 | TØNSBERG |
| NM RØR AS | 996798011 | OSLO |
| NMS EIENDOM BERGEN AS | 922179611 | BERGEN |
| NMT NORDMARK MASKIN & TRANSPORT AS | 948469049 | HARSTAD |
| NOA VVS AS | 915448941 | STORD |
| NOBEL RØR INSTALLASJON AS | 992139633 | VÅGAN |
| NOBI BYGG OG BETONG AS | 931491865 | VOSS |