 | ING MORTEN FURE AS ELEKTROENTREPRENØREN | 950739126 | OSLO |
| INGMUND SANDRØD | 974499215 | STANGE |
| INGOLF VIKEN AS | 912797554 | FJALER |
| ING ØYVIND JØRGENSEN AS | 936921736 | STORD |
| ING PAAL LEFDAHL ENTREPRENØRFORRETNING AS | 958693303 | BÆRUM |
| ING P NOME AS | 924368020 | HORTEN |
| ING. RASMUSSEN & STRAND AS | 999173217 | OSLO |
| ING S D BAASTAD AS | 836946162 | OSLO |
| ING./TAKSTMANN ASLE THOMASSEN | 980231135 | SORTLAND |
| ING. TAULE AS | 988103381 | ALVER |
| ING. TRYGVE JENSEN AS | 997019466 | ARENDAL |
| INGVALD ROGNALDSEN AS MURMESTERFORRETNING | 932092050 | BERGEN |
| INGVALDSEN SERVICE AS | 927808420 | STRAND |
| ING. VIDAR NILSEN AS | 915183964 | ALTA |
| INJEKSJONSTEKNIKK AS | 957688020 | OSLO |
| INKA ENTREPRENØR AS | 982714737 | OSLO |
| INNEKLIMAXPERTEN - BKM AS | 913136276 | KRISTIANSAND |
| INNHAVET TRANSPORT AS | 972409979 | HAMARØY |
| INNHERRED ANLEGG OG UTEMILJØ AS | 931072951 | INDERØY |
| INNHERRED ENTREPRENØR AS | 916761856 | LEVANGER |
| INNLANDET BYGG AS | 925075140 | SEL |
| INNLANDET BYGGETEKNIKK AS | 927585952 | GAUSDAL |
| INNLANDET ELEKTRO AS | 925732567 | HAMAR |
| INNLANDET ENTREPRENØRSUPPORT AS | 923704523 | NORD-AURDAL |
| INNLANDET FLIS & MUR AS | 925794813 | GJØVIK |
| INNLANDET GEOTEKNIKK AS | 924789778 | KONGSVINGER |
| INNLANDET LANDSKAPSUTFORMING AS | 916818122 | LILLEHAMMER |
| INNLANDET SERVICE AS | 924413948 | LOM |
| INNLANDET TAKSTFORRETNING AS | 929007751 | RINGSAKER |
| INNLANDET TAKTEKKING AS | 931996835 | RINGSAKER |
| INNLANDET TRE & BETONG AS | 999311709 | SØR-ODAL |
| INNLANDSCONSULT AS | 986469028 | HAMAR |
| INNMÅLINGSTJENESTER AS | 979927703 | BERGEN |
| INNOMHUS AS | 985806063 | BERGEN |
| INNORE AS | 819337772 | LILLESTRØM |
| INNOVA BYGG AS | 858529972 | BÆRUM |
| INNTRE KJELDSTAD AS | 986044019 | STEINKJER |
| INNVÆR MUR & BETONG AS | 923084851 | VINDAFJORD |
| INNVEST MONTASJE AS | 932422999 | HAREID |
| INOR AS | 986594124 | TROMSØ |
| INRIGO AS | 921474431 | TRONDHEIM |
| INSENTI AS | 996043851 | OSLO |
| IN SITU AS | 992355212 | MOSS |
| INSTALL AS | 911853914 | LIER |
| INSTALLATØRENE AS | 997781694 | OSLO |
| INSTALLATØREN FREDRIKSTAD AS | 912645177 | FREDRIKSTAD |
| INSTALLATØR PER ØVERLAND AS | 919811714 | PORSGRUNN |
| INSTALLATØR STIG LIND AS | 875971832 | ØKSNES |
| INSTANES AS RÅDGIVENDE INGENIØRER | 934485378 | BERGEN |
| INSTANT VVS AS | 916914067 | LILLESTRØM |