 | NÆRBYGG AS | 994545116 | ÅLESUND |
| NÆRINGSBYGG AS | 920205968 | TRONDHEIM |
| NÆRINGSHUS AS | 998145201 | BERGEN |
| NÆRMILJØ HAGE OG ANLEGG AS | 986563407 | BERGEN |
| NÆRØYSUND ENTREPRENØR AS | 992421541 | NÆRØYSUND |
| NÆSSET MEK. VERKSTED AS | 991425276 | JEVNAKER |
| NÆSS RØR & INTERIØR AS | 959483671 | SURNADAL |
| NAGELSEN RØR AS | 980392376 | BERGEN |
| NÅ MASKIN AS | 912176932 | ULLENSVANG |
| NAMDAL ELEKTRO AS | 994510789 | NAMSOS |
| NAMDALGRUPPEN AS | 825589562 | NAMSOS |
| NAMDALSLAFT ENTREPRENØR AS | 989006142 | RØYRVIK |
| NAMDAL VVS TEKNIKK AS | 978594085 | SNÅSA |
| NAMSOS RØR AS | 918637931 | NAMSOS |
| NAMSSKOGANBYGG AS | 922173540 | NAMSSKOGAN |
| NAMSSKOGAN RØR AS | 937155352 | NAMSSKOGAN |
| NANNESTAD BYGDESERVICE SA | 974470535 | NANNESTAD |
| NANNESTAD GRØNTMILJØ AS | 915892272 | NANNESTAD |
| NANNESTAD/RÅHOLT RØRLEGGERBEDRIFT AS | 927551365 | LILLESTRØM |
| NARO RØR OG FLIS AS | 831703512 | SARPSBORG |
| NARVIK EL AS | 920408133 | NARVIK |
| NARVIK RØR AS | 922918198 | NARVIK |
| NATHANIEL HANSEN AS | 918887938 | ÅMLI |
| NATLAND GRAVESERVICE AS | 918063005 | HJELMELAND |
| NATURBASERT AS | 925610356 | HAMAR |
| NATURBYGG ENTREPRENØR AS | 976714237 | GJERDRUM |
| NATURMUR AS | 989877372 | GRIMSTAD |
| NATURSTEINSMURING AS | 925880175 | KLEPP |
| NATURSTEIN SØR AS | 927454254 | LINDESNES |
| Naustdal Blikkenslagerverksted A/S | 946551651 | SUNNFJORD |
| NAVAREN ANALYSE AS | 951846856 | VADSØ |
| NB BETONG AS | 915039065 | LIER |
| NBBO BYGGTEK AS | 976815653 | DRAMMEN |
| NB BOLIGER AS | 924823100 | ÅLESUND |
| N. B. BYGGTEAM AS | 990780501 | STAVANGER |
| NBN FLORØ AS | 923160388 | KINN |
| NBN NAUSTDAL AS | 916522800 | SUNNFJORD |
| NC BYGG AS | 911572095 | ALTA |
| NCC INDUSTRY AS | 984884176 | OSLO |
| NCC NORGE AS | 911274426 | OSLO |
| NCGS AS | 998418127 | ØVRE EIKER |
| NCO AS | 995905949 | OSLO |
| ND BYGG AS | 924792043 | OSLO |
| NEA ENTREPRENØR AS | 926623818 | SELBU |
| NEBBENES BYGG AS | 998859042 | LILLESTRØM |
| NEC AS | 898438422 | BERGEN |
| NEDIG AS | 979394179 | ARENDAL |
| NEDREBØ MASKIN & TRANSPORT AS | 816823692 | BOKN |
| NEDRE ROMERIKE BYGG AS | 997517288 | LILLESTRØM |
| NEDRE ROMERIKE RØR OG VEDLIKEHOLD AS | 927324423 | LILLESTRØM |