 | NORGESHUS TVEDESTRAND AS | 914812267 | VEGÅRSHEI |
| NORGES RØRLEGGERBEDRIFT AS | 993770000 | ENEBAKK |
| NORGES TAK & BLIKK AS | 832738662 | OSLO |
| NORGESTAK TRØNDELAG AS | 915320813 | VERDAL |
| NORGESTAK VEST AS | 833995642 | VERDAL |
| NORGES VASSDRAGS- OG ENERGIDIREKTORAT (NVE) | 970205039 | OSLO |
| NORGE TEK AS | 936792200 | MOSKENES |
| NORGE VVS AS | 935019249 | MOSKENES |
| NORHAGEN MUR AS | 913666712 | BÆRUM |
| NORHEAT AS | 917733953 | RINGSAKER |
| NORHEIM ENTREPRENØR AS | 933954692 | BERGEN |
| NORHEIMS HUS AS | 928569055 | MODUM |
| NORHEIMSUND ELEKTRO AS | 981187474 | KVAM |
| NORMA GEOSYSTEMS AS | 825831622 | JEVNAKER |
| NOR-MAK BYGG AS | 919822473 | INDRE ØSTFOLD |
| NORMAN BYGG AS | 999506771 | BERGEN |
| NORM AS | 991131752 | RINGERIKE |
| NORNEBYGG AS | 927665875 | LYNGDAL |
| NORNES BETONG AS | 928724166 | VOSS |
| NORØR AS | 936343120 | BJØRNAFJORDEN |
| NOROVENT AS | 955521668 | HAUGESUND |
| NORPRO ENTREPRENØR AS | 933058204 | SARPSBORG |
| Norprosjekt A.S. | 946351032 | OSLO |
| NORPROTAK AS | 837045142 | SVEIO |
| NORRMAN SPRINKLERKONTROLL AS | 926088734 | SKIEN |
| NORSIA RØR AS | 985633797 | GILDESKÅL |
| NORSJØ ARKITEKTER AS | 995711664 | MIDT-TELEMARK |
| NORSKAND PROSJEKT AS | 912785920 | MOSS |
| NORSK BADEROM AS | 927341913 | STAVANGER |
| NORSK BETONGREHABILITERING AS | 836126882 | KONGSBERG |
| NORSK BOLIGVENTILASJON V PER SNOPESTAD | 982132886 | INDRE ØSTFOLD |
| NORSK BRANN & ISOLERING AS | 934965329 | DRAMMEN |
| NORSK BRANNKONSEPT AS | 929514874 | ULLENSAKER |
| NORSK-BYGG AS | 918753133 | HJARTDAL |
| NORSK BYGG CONSULT AS | 916592477 | RÆLINGEN |
| NORSK BYGGEKONTROLL AS | 923419241 | ÅS |
| NORSK BYGGSERVICE AS | 980381587 | LARVIK |
| NORSKE BÆRESYSTEMER AS | 996808548 | OSLO |
| NORSKE FJELLHUS AS | 984280696 | FLESBERG |
| NORSKE HALLSYSTEMER AS | 991300813 | STANGE |
| NORSK EL-ENTREPRENØR AS | 956109426 | OSLO |
| NORSKE METALLFASADER AS | 876933322 | STANGE |
| NORSK ENERGI | 945469277 | OSLO |
| NORSK ENERGIANALYSE AS | 998562619 | STRAND |
| NORSK KONSTRUKSJONSRÅDGIVNING AS | 922231176 | VERDAL |
| NORSK MASSIVTRE AS | 992416440 | SØR-AURDAL |
| NORSK MILJØSERVICE AS | 912524698 | SYKKYLVEN |
| NORSK MODUL AS | 918716505 | BAMBLE |
| NORSK PUMPESERVICE AS | 934814185 | LILLESTRØM |
| NORSK RØRKOMPETANSE AS | 834792192 | MODUM |
| NORSK RØRSERVICE AS | 913529979 | OSLO |
| NORSK SPENNBETONG AS | 980884953 | SANDNES |
| NORSK SPRINKLERTEKNIKK AS | 919847816 | PORSGRUNN |
| NORSK TEKNISK INSTALLASJON AS | 996099881 | LIER |
| NORSK VVS EKSPERT AS | 916583729 | LILLESTRØM |
| NORST AS | 911755084 | ÅLESUND |
| NORSURVEY AS | 927720310 | TROMSØ |
| NORTAKST AS | 984536518 | NES |
| 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 |
| 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 |