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| CHRISTOFFERSEN BYGG | 931113445 | DRAMMEN |
| CHR M VESTRHEIM AS | 917154678 | BERGEN |
| CH STADLER KFT | 989688030 | |
| CIBES LIFT NORGE AS | 913117972 | ASKER |
| CIRKELBYGG AS | 991632735 | ASKER |
| CITY RØR AS | 989714023 | OSLO |
| CIVIL ENGINEERING CONSULTANCY AS | 991851607 | ÅSNES |
| CK NOR BYGG AS | 912418804 | SANDEFJORD |
| CLAESSEN & JOHNSEN AS | 994593390 | SUNNDAL |
| CLASSIC BAD AS | 929618793 | BERGEN |
| CLAUSSEN ARKITEKTER | 997861949 | OSLO |
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| Combi Hus A/S | 947266594 | SANDNES |
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| COMFORT BJØRN SEEM AS | 916340796 | GRONG |
| COMFORT BRYN AS | 985160759 | OSLO |
| COMFORTBUTIKKEN RØRSENTERET AS | 977362407 | OPPDAL |
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| COMFORT HARSTAD AS | 992985151 | HARSTAD |
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| CONCRETI AS | 929046552 | LILLEHAMMER |
| CON-FORM AS | 931419323 | OSLO |
| CON-FORM BERGEN AS | 978650783 | ØYGARDEN |
| CONKRET AS | 929798945 | TRONDHEIM |
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| CONRAD BYGG AS | 912282570 | VÅGAN |
| CONSEM ENTREPRENØR AS | 987474742 | RÅDE |