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| IAC VESTCOLD AS | 877301702 | SANDEFJORD |
| IBENHOLT CONSULT AS | 820579542 | TROMSØ |
| IBETONG AS | 916604580 | TIME |
| I BJØRØ KOBBER & BLIKK AS | 921524005 | BJØRNAFJORDEN |
| IB MASKIN AS | 994550144 | VOSS |
| IBO ARKITEKTUR AS | 933924114 | OSLO |
| I-BOLIG AS | 976746996 | ULLENSAKER |
| IBR INNSTALLASJON OG BYGGSERVICE AS | 981648196 | NORDRE FOLLO |
| IB RØRSERVICE AS | 931145274 | ELVERUM |
| I BYGG AS | 996013081 | TØNSBERG |
| ICC NORDEN AS | 821277302 | OSLO |
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| IDEHUSGRUPPEN AS | 980879798 | TRONDHEIM |
| IDEHUS MODUM AS | 996467023 | MODUM |
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| IDEHUS ØSTFOLDBYGG AS | 990092966 | INDRE ØSTFOLD |
| IDEHUS ROMERIKE AS | 989384899 | EIDSVOLL |
| IDÉHUS TRONDHEIM AS | 885832202 | TRONDHEIM |
| IDLAND BYGG & BETONG AS | 994340972 | GJESDAL |
| IDLAND VVS AS | 912609170 | SANDNES |
| ID RØR AS | 928806782 | OSLO |
| I.E. CONSULT AS | 929564847 | HORTEN |
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| IGANG TOTALENTREPRENØR AS | 922987106 | KLEPP |
| IGLAND GARASJEN AS | 970953302 | GRIMSTAD |
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| IHUGA AS | 911874571 | OSLO |
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| IMTAS PROSJEKT AS | 987309113 | RANA |
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