 | HYTTESERVICE- AS | 925301310 | ARENDAL |
| IAC VESTCOLD AS | 877301702 | SANDEFJORD |
| IAM EIENDOM AS | 992651679 | ØYGARDEN |
| 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 |
| IDAR NESE AS | 989082108 | ASKØY |
| IDÉHUS ÅLESUND AS | 991569405 | ÅLESUND |
| IDEHUS ASKER OG BÆRUM AS | 914922259 | ASKER |
| IDEHUSGRUPPEN AS | 980879798 | TRONDHEIM |
| IDEHUS MODUM AS | 996467023 | MODUM |
| 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 |
| I.E. CONSULT AS | 929564847 | HORTEN |
| IELEKTRO AS | 980887995 | MOLDE |
| 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 |
| IKOVENT AS | 833412922 | BÆRUM |
| IKR INGENIØRKONTOR AS | 991326278 | STAVANGER |
| IKT-ELEKTRO AS | 987218452 | OSLO |
| I LIE & SØNNER AS | 945786728 | SØR-AURDAL |
| IMC DIVING AS | 932624036 | BERGEN |
| IMEM LIFTS NORWAY AS | 935986648 | NANNESTAD |
| IMPERIUM SUMMA AS | 926597922 | FÆRDER |
| IMPLENIA NORGE AS | 980332977 | BÆRUM |
| IMTAS HARSTAD AS | 933870855 | HARSTAD |
| IMTAS PROSJEKT AS | 987309113 | RANA |
| IMVIK AS | 923756280 | NORDRE FOLLO |
| IN BY AS | 858261082 | OSLO |
| INCEPTIO AS | 927060345 | OSLO |
| INCUBE AS | 999114954 | OSLO |
| INDERGÅRD BAD AS | 989582070 | ORKLAND |
| INDIAN BYGG AS | 979923953 | LILLESTRØM |
| INDIGO ARKITEKTER AS | 988579165 | BÆRUM |
| INDIRA AS | 912270440 | NARVIK |
| INDRE ØSTFOLD BYGG AS | 921571399 | INDRE ØSTFOLD |
| INDUSTRIRØRLEGGERN AS | 911972433 | SØNDRE LAND |
| INE HAUGER AS | 934049365 | EIDSVOLL |
| INFLUIT AS | 929303822 | ØYGARDEN |
| INFRA ANLEGG AS | 990549931 | FAUSKE |
| INFRAKON AS | 925918946 | RANA |
| INFRANORD NORGE AS | 996230007 | OSLO |
| INFRATEK NORGE AS | 984277032 | OSLO |
| INGARD LANGSHOLDT AS | 932106450 | SARPSBORG |
| ING. ASBJØRN DANIELSEN AS | 924300094 | BERGEN |
| ING. ATIF AKRAM | 994739778 | MOSS |
| INGEBO MASKIN AS | 927979055 | ØVRE EIKER |
| INGE BYBERG AS | 916338651 | EIGERSUND |
| ING. EGIL CHRISTIANSEN AS | 932139677 | BÆRUM |
| INGE HAUGAN BYGG AS | 987038489 | TRONDHEIM |
| INGE JENSEN MASKIN AS | 988412597 | SORTLAND |
| INGEMANN AS | 995696770 | SULDAL |
| INGENIØR ANN-THERES LØCHEN | 999548903 | FREDRIKSTAD |
| INGENIØR BJARNE AARDAL AS | 980260380 | BERGEN |
| INGENIØR BYGG AS | 931773194 | STANGE |
| INGENIØRFIRMA BIG AS | 976721144 | FREDRIKSTAD |
| INGENIØRFIRMAET L S SOLLAND AS | 918160922 | STAVANGER |
| INGENIØRFIRMAET R. TORGERSEN AS | 987396245 | ASKØY |
| INGENIØRFIRMAET SVENDSEN & CO AS | 975950530 | SARPSBORG |
| INGENIØRFIRMA LAUGTUG AS | 922324956 | STJØRDAL |
| INGENIØRFIRMA STEPHENSEN AS | 929553403 | SARPSBORG |
| INGENIØRFIRMA T JESPERSEN AS | 983190553 | NARVIK |
| INGENIØRGEOLOG LEIV PEDERSEN AS | 899162722 | LIER |
| INGENIØR GUNNAR JOHANSSON AS | 997701305 | OSLO |
| INGENIØR HANS BECKER AS | 812013742 | OSLO |
| INGENIØR IVAR PETTERSEN AS | 961773490 | DRAMMEN |
| INGENIØR KNUT LARSEN AS AUT RØRLEGGERMESTER | 984883730 | OSLO |
| INGENIØRKONTORET INGENIA AS | 968142739 | OSLO |
| INGENIØR LAURITZ NES AS | 944875174 | ÅLESUND |
| INGENIØR- OG MURFIRMA LARS AARUM AS | 975843793 | SARPSBORG |
| INGENIØR OG TØMRERMESTER FAYE AS | 916160542 | OSLO |
| INGENIØR SERVICE AS | 979749651 | OSLO |
| INGENIØRSERVICE AS | 879982502 | TØNSBERG |
| INGENIØR SVEIN BONNEGOLT | 981817680 | LARVIK |
| INGENIØRTEKNIKK AS | 971157682 | NORDRE FOLLO |
| INGENIØR TIDEMAND AS | 916758391 | OSLO |
| INGENIØR TOM NORENG | 988752304 | RINGSAKER |
| INGENIØR TORE VESTLAND | 979921861 | TØNSBERG |
| INGENIUM AS | 935122147 | RINGERIKE |
| INGE VAAGA AS | 989276239 | HAUGESUND |
| ING F WICKSTRØM AS | 963978197 | OSLO |
| ING. HANSEN AS | 935970520 | FREDRIKSTAD |