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| IFORM BYGG AS | 999325025 | TRONDHEIM |
| IGANG TOTALENTREPRENØR AS | 922987106 | KLEPP |
| IGLAND GARASJEN AS | 970953302 | GRIMSTAD |
| IGNIST AS | 927386259 | OSLO |
| IGN VVS AS | 914743834 | OSLO |
| I HELMEN UTEMILJØ AS | 926460110 | GRAN |
| IHUGA AS | 911874571 | OSLO |
| IK BYGG AS | 927159295 | NES |
| IKM OCEAN DESIGN AS | 987818638 | SANDNES |
| IKM SAFE CONTROL AS | 976515501 | TVEDESTRAND |
| IKON ARKITEKT & INGENIØR AS | 992869631 | SMØLA |
| IKR INGENIØRKONTOR AS | 991326278 | STAVANGER |
| IKT-ELEKTRO AS | 987218452 | OSLO |
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| I LIE & SØNNER AS | 945786728 | SØR-AURDAL |
| IMC DIVING AS | 932624036 | BERGEN |
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| IMTAS PROSJEKT AS | 987309113 | RANA |
| IMVIK AS | 923756280 | NORDRE FOLLO |
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| INCUBE AS | 999114954 | OSLO |
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| INDERGÅRD BAD AS | 989582070 | ORKLAND |
| INDIAN BYGG AS | 979923953 | LILLESTRØM |
| INDIGO ARKITEKTER AS | 988579165 | BÆRUM |
| INDIRA AS | 912270440 | NARVIK |
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