 | NORTHERM SERVICE AS | 920503527 | ASKER |
| NORTHROADS AS | 815644042 | RANA |
| NORTRONIK AS | 993770159 | SUNNFJORD |
| NORVA24 GRAVCO AS | 998586259 | OSLO |
| NORVALD JØRGENSEN AS | 917493111 | SENJA |
| NORWEGIAN PIPELINE DRILLING AS | 966671300 | STAVANGER |
| NORWEGIAN SERVICE TEAM BYGGSERVICE AS | 977222958 | KARMØY |
| NOSSUM RØR AS | 990000077 | OSLO |
| NØSTVOLD ANLEGG AS | 937464746 | SØRREISA |
| NOTODDEN RØRLEGGERFORRETNING AS | 951819174 | NOTODDEN |
| NØTTERØY GRAVESERVICE AS | 911906287 | FÆRDER |
| NØTTERØY RØRSERVICE AS | 982973112 | FÆRDER |
| NOVA BYGG LIER AS | 819421242 | DRAMMEN |
| NOVAFORM AS | 991356959 | SANDNES |
| NOVATEK AS | 973199730 | BODØ |
| NOVA WATER SOLUTIONS AS | 936418198 | BÆRUM |
| NOVETA AS | 964069565 | ASKER |
| NOVI EIENDOM AS | 933115046 | OSLO |
| NOVIUM ENTREPRENØR AS | 922031878 | OSLO |
| NOVO ENTREPRENØR AS | 921688687 | OSLO |
| NOVUS BYGG AS | 934428218 | HARSTAD |
| N P BYGG AS | 942273711 | OSLO |
| NPC GROUP AS | 894906162 | BÆRUM |
| NP CONSULT SP. Z O.O. NUF | 917207798 | |
| NRC KEPT AS | 997710371 | BÆRUM |
| NRC NORGE AS | 914601290 | BÆRUM |
| NRT RØRSERVICE AS | 936631053 | OSLO |
| NSK RØR AS | 935389356 | ØYGARDEN |
| NSW ARKITEKTUR AS | 940716845 | OSLO |
| N-TEK AS | 923477640 | SOGNDAL |
| NTEK TAKST AS | 934221540 | INDRE ØSTFOLD |
| NT ENTREPRENØR AS | 952135422 | TROMSØ |
| NTG AS | 963130007 | ØVRE EIKER |
| NTH AS | 913119304 | VANG |
| NTK BYGGTJENESTER AS | 930163961 | SKIEN |
| NT RØR OG INDUSTRI AS | 930567639 | STORFJORD |
| NT RØRSERVICE TAJIK | 929869249 | DRAMMEN |
| NUMEDAL GRAVING OG TRANSPORT AS | 990131198 | NORE OG UVDAL |
| NUNO ARKITEKTUR AS | 942826400 | OSLO |
| NVG RØR AS | 928335704 | NES |
| NYBOLOFT ENTREPRENØR AS | 985224439 | HAMMERFEST |
| NYBYGGERN AS | 982044537 | LYNGDAL |
| NYDAHL ANLEGG AS | 915199739 | HAMAR |
| NYDALS MASKINSTASJON AS | 853097012 | HARSTAD |
| NYE ARKEL ROMERIKE AS | 931327003 | RÆLINGEN |
| NYE MONTASJESERVICE AS | 931605593 | ASKER |
| NYE NORDLANDTAK AS | 932405342 | VEFSN |
| NYGÅRD ENTREPRENØR AS | 925231363 | ENGERDAL |
| NYGÅRD TAK AS | 990483582 | SVEIO |
| NYHEIM BYGG OG ANLEGG AS | 933902420 | ALSTAHAUG |
| Ny-Hus AS | 931120875 | BERGEN |
| NYLAND BYGGEADMINISTRASJON AS | 934767403 | SANDNES |
| NYMARK VVS AS | 933916545 | SANDNES |
| NYMOE ELEKTRO AS | 986673768 | ALTA |
| NYPAN HAGE & ANLEGG AS | 985264392 | TRONDHEIM |
| NYRØ TEKNOLOGI AS | 924403152 | ØRSTA |
| NYSTED AS | 976074580 | BALSFJORD |
| NYSTØ BYGG AS | 833794302 | KONGSVINGER |
| NYSTØL & FAGERHOL AS | 981463579 | VANYLVEN |
| NY STRUKTUR AS | 918294112 | OSLO |
| NYTTBYGG AS | 913359771 | SARPSBORG |
| NYTT PROSJEKT AS | 974389657 | OSLO |
| NYVOLD INSTALLASJON AS | 957724787 | OPPDAL |
| NYVOLL CONSULT AS | 993172537 | NITTEDAL |
| NZ RØRSERVICE AS | 922129800 | LILLESTRØM |
| Ø.ANTONSEN AS | 964377111 | BERGEN |
| O A SANNE AS | 932521806 | MOLDE |
| OBAS ENTREPRENØR AS | 960018095 | BERGEN |
| OBB AS | 921230125 | BJØRNAFJORDEN |
| OB BRENDEMOEN AS | 965678492 | NORD-FRON |
| ØBE AS | 921863993 | ULLENSAKER |
| OBERRAUTER BYGG OG SPRENGNING AS | 915540813 | VESTBY |
| OBOS BLOCK WATNE ENTREPRENØR AS | 930061212 | OSLO |
| OBOS PROSJEKT AS | 931536532 | OSLO |
| OBRON GRUPPEN AS | 998300665 | TRONDHEIM |
| ØB RØR AS | 936606040 | ØRSTA |
| ØB-TAK AS | 971072830 | OSLO |
| OCAB AS | 916326211 | BÆRUM |
| ODAL ANLEGGSDRIFT AS | 932475057 | NORD-ODAL |
| ODAL BYGG AS | 931933795 | SØR-ODAL |
| ODAL ENTREPRENØR AS | 994449826 | SØR-ODAL |
| O D BYGG AS | 924661399 | HØYANGER |
| ODD ARNE AARSTAD | 977105579 | KONGSVINGER |
| ODD BARTHO-HANSEN & SØNNER AS | 955499697 | FÆRDER |
| ODD BJERKEVOLL AS | 942654723 | VESTNES |
| ODD EINAR KNE AS | 974904535 | STEINKJER |
| ODD ERLING LØVØY | 968174835 | HERØY (MØRE OG ROMSDAL) |
| ODD FARMEN AS | 925415693 | LARVIK |
| ODD HAGERUD AS | 976018192 | EIDSKOG |
| ODD HEIBERG AS | 984556128 | HORTEN |
| ODD MATHISEN AS | 979924410 | ALTA |
| ODDMUND GROVEN AS | 923627804 | ØRLAND |
| Odd-Petter Hosen AS | 947714821 | ÅFJORD |
| ODD SMÅGE AS | 954505170 | AUKRA |
| ODD STENSVOLD AS | 995680084 | LARVIK |
| ODDVAR MELING AS | 980151794 | STAVANGER |
| ODDVAR ØYGARD AS | 985793581 | ÅL |
| ØDEGAARD ANLEGG AS | 992170905 | BRØNNØY |
| ØDEGAARD OG STERTEN AS | 997907116 | BÆRUM |
| ØDEGÅRD BYGG OG MASKIN AS | 919232773 | LUSTER |