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| NG BYGG AS | 998182409 | ØRLAND |
| NGS MASKIN AS | 998516854 | SVEIO |
| NH MASKIN AS | 976594967 | ASKØY |
| NH MELHUSBYGG AS | 891111932 | MELHUS |
| N.H. TAKST & BYGGRÅDGIVNING AS | 928651703 | VÅLER (ØSTFOLD) |
| NIC JACOBSEN ENTREPRENØR AS | 959524297 | ØYGARDEN |
| NICO BLIKK AS | 913146212 | KRISTIANSAND |
| NICOLAYSEN ANLEGG OG TRANSPORT AS | 964694583 | RÅDE |
| NIDAROS BYGGKOMPETANSE AS | 918629025 | TRONDHEIM |
| NIDAROS OPPMÅLING AS | 984430299 | TRONDHEIM |
| 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 |