 | NORTEK ELEKTRO AS | 977076153 | ÅFJORD |
| NORTEKK AS | 963772459 | LILLESTRØM |
| NORTEK SECURITY & TECHNOLOGY AS | 995173743 | DRAMMEN |
| NORTHERM SERVICE AS | 920503527 | ASKER |
| NORTHROADS AS | 815644042 | RANA |
| NORTRONIK AS | 993770159 | SUNNFJORD |
| NORVALD JØRGENSEN AS | 917493111 | SENJA |
| NORWEGIAN PIPELINE DRILLING AS | 966671300 | STAVANGER |
| NORWEGIAN SERVICE TEAM BYGGSERVICE AS | 977222958 | KARMØY |
| NOSSUM RØR AS | 990000077 | OSLO |
| NØSTETANGEN ENTREPRENØR AS | 998454980 | ØVRE EIKER |
| NOTODDEN BYGGENTREPRENØR AS | 925924598 | NOTODDEN |
| NOTODDEN RØRLEGGERFORRETNING AS | 951819174 | NOTODDEN |
| NØTTERØY GRAVESERVICE AS | 911906287 | FÆRDER |
| NØTTERØY RØRSERVICE AS | 982973112 | FÆRDER |
| NOVA BYGG LIER AS | 819421242 | LIER |
| NOVAFORM AS | 991356959 | SANDNES |
| NOVATEK AS | 973199730 | BODØ |
| NOVE AS | 923223754 | STORD |
| NOVETA AS | 964069565 | ASKER |
| NOVI EIENDOM AS | 933115046 | OSLO |
| NOVIRA BYGG AS | 919039094 | ALTA |
| NOVIUM ENTREPRENØR AS | 922031878 | OSLO |
| NOVO ARKITEKTER AS | 999641792 | KRISTIANSAND |
| NOVO ENTREPRENØR AS | 921688687 | OSLO |
| N P BYGG AS | 942273711 | OSLO |
| NPC GROUP AS | 894906162 | BÆRUM |
| NP CONSULT NORGE NUF | 917207798 | |
| NRA ØST AS | 999094368 | LØRENSKOG |
| NRC KEPT AS | 997710371 | BÆRUM |
| NRC NORGE AS | 914601290 | BÆRUM |
| NR MASKIN AS | 920446108 | BJØRNAFJORDEN |
| NS MASKIN AS | 923070354 | AURSKOG-HØLAND |
| NS SERVICE PLUS AS | 929082524 | RÆLINGEN |
| NSW ARKITEKTUR AS | 940716845 | OSLO |
| NTE ELEKTRO AS | 992090006 | STEINKJER |
| N-TEK AS | 923477640 | SOGNDAL |
| NTEK TAKST AS | 934221540 | INDRE ØSTFOLD |
| NT ENTREPRENØR AS | 952135422 | TROMSØ |
| NTG AS | 963130007 | ØVRE EIKER |
| NTK BYGGTJENESTER AS | 930163961 | SKIEN |
| NT RØRSERVICE TAJIK | 929869249 | DRAMMEN |
| NUMEDAL GRAVING OG TRANSPORT AS | 990131198 | NORE OG UVDAL |
| NUNO ARKITEKTUR AS | 942826400 | OSLO |
| NUPEN AS | 916067623 | HARSTAD |
| NVG RØR AS | 928335704 | NES |
| NYBOLOFT ENTREPRENØR AS | 985224439 | HAMMERFEST |
| NYBYGGERN AS | 982044537 | LYNGDAL |
| NYDAHL ANLEGG AS | 915199739 | HAMAR |
| NYDALS MASKINSTASJON AS | 853097012 | HARSTAD |