| NORSK SPENNBETONG AS | 980884953 | SANDNES |
| NORSK SPRINKLER AS | 911817454 | OSLO |
| NORSK SPRINKLERTEKNIKK AS | 919847816 | PORSGRUNN |
| NORSKTECH AS | 915336361 | OSLO |
| NORSK TEKNISK INSTALLASJON AS | 996099881 | LIER |
| NORSK VVS EKSPERT AS | 916583729 | LILLESTRØM |
| NORST AS | 911755084 | ÅLESUND |
| NORSURVEY AS | 927720310 | TROMSØ |
| NOR TEAM ENTREPRENØRFORRETNING AS | 929079272 | SENJA |
| 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 |
| NORUM PER Ø TØMRERMESTER | 969954265 | NORDRE FOLLO |
| 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 |
| 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 | OSLO |
| NP CONSULT NORGE | 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 |
| NTC ARKITEKTER AS | 824809852 | STAD |
| NTE ELEKTRO AS | 992090006 | STEINKJER |
| N-TEK AS | 923477640 | SOGNDAL |
| NT ENTREPRENØR AS | 952135422 | TROMSØ |
| NTG AS | 963130007 | ØVRE EIKER |
| NTK BYGGTJENESTER AS | 930163961 | SKIEN |