 | INTERIØRFAGHUSET T. LUND AS | 820500482 | STAVANGER |
| INTERNO BYGG & INTERIØR AS | 922885621 | OSLO |
| INTER RØR AS | 932559331 | SULA |
| INTO ELEKTRO AS | 859028012 | KVINNHERAD |
| INTO RØYR AS | 990977631 | KVINNHERAD |
| INVENT AS | 986464352 | BERGEN |
| IPEC MILJØ AS | 935235618 | BIRKENES |
| IPOA AS | 997039297 | MOSS |
| IR BETONGARBEID AS | 913194020 | SIRDAL |
| IRBYGG ENTREPRENØR AS | 920405746 | OSLO |
| IRPA AS | 999609384 | HALDEN |
| ISACHSEN ANLEGG AS | 970999507 | DRAMMEN |
| ISAKSEN EIENDOM AS | 984255969 | SØRREISA |
| ISAKSEN NYBYGG OG RESTAURERING | 974987007 | BÅTSFJORD |
| ISBANETEKNIKK AS | 929802667 | HOLMESTRAND |
| ISDALSTØ ANLEGGSERVICE AS | 978654363 | ALVER |
| ISHAVSBYEN ELEKTRO AS | 931596039 | TROMSØ |
| ISOMUR AS | 984571941 | TØNSBERG |
| ISOTAK BYGG AS | 947185039 | BÆRUM |
| Isoteks Miljø AS | 943842353 | GJØVIK |
| ISOVENT AS | 999578837 | KINN |
| ISTAND AS | 932206048 | SUNNFJORD |
| ITECH AS | 959686017 | OSLO |
| ITEK AS | 873194472 | LILLESAND |
| IVAN & KJETIL RØR AS | 984357117 | STAVANGER |
| IVAR AAMBAKK AS | 948776901 | ØRSTA |
| IVAR ALMROTH TRANSPORT & GRAVING AS | 941675417 | LØRENSKOG |
| IVAR BRÅTHEN MEKANISKE AS | 979901925 | STANGE |
| IVAR GRÆNDSEN | 985857075 | OPPDAL |
| IVAR HAUGEN | 980070336 | SUNNDAL |
| IVAR HORSGÅRD | 967986534 | MOLDE |
| IVAR IKS | 871035032 | STAVANGER |
| IVAR ØDEGAARD GRAVING OG TRANSPORT | 926087169 | EIDSVOLL |
| IVAR TANUM ENTREPRENØR AS | 987837969 | DRAMMEN |
| IVCON AS | 927083485 | NESSEBY |
| IVERK AS | 928719863 | HAUGESUND |
| IVEST CONSULT AS | 993456721 | KINN |
| IVRE ANLEGGSSERVICE AS | 980404889 | ARENDAL |
| IVRE SPORT OG ANLEGG AS | 980585689 | ARENDAL |
| JA ARKITEKTER AS | 928238385 | LINDESNES |
| JACOBSEN BYGG AS | 927456575 | RISØR |
| JACOBSEN & CO AS | 913035801 | HERØY (MØRE OG ROMSDAL) |
| JACOBSEN ENTREPRENØR AS | 923060146 | TØNSBERG |
| JACOBSEN SNEKKERSERVICE AS | 975858847 | TRONDHEIM |
| JADARHUS BYGG AS | 991478442 | STAVANGER |
| JÆGER BRUDVIK ARKITEKTER AS | 920379664 | OSLO |
| JÆRBYGG AS | 925350281 | TIME |
| JÆRCONSULT AS | 889958022 | TIME |
| JÆREN GRAVESERVICE AS | 916524927 | KLEPP |
| JÆRENTREPRENØR ANLEGG AS | 930022837 | HÅ |