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| CORRECT BYGG AS | 913042344 | BÆRUM |
| COSMIC BYGG AS | 939429794 | SANDEFJORD |
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| COWI AS | 979364857 | OSLO |
| CP ENTREPRENØR AS | 932160102 | ULLENSAKER |
| CRAFT ENTREPRENØR AS | 919827270 | ØYGARDEN |
| CREATIV BYGG AS | 998450179 | FÆRDER |
| CREDO BOLIG AS | 990832587 | HAMAR |
| CRESCO EIENDOM AS | 987579900 | NORDRE FOLLO |
| CRITICAL INFRASTRUCTURE SERVICES AS | 927454939 | LØRENSKOG |
| CRS ELEKTRO AS | 928180034 | MOSS |
| CRUX ARKITEKTUR AS | 922252556 | OSLO |
| CS BYGGPARTNER AS | 979218249 | TØNSBERG |
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| CURVE STUDIO AS | 928603180 | FÆRDER |
| CV SERVICE AS | 929637275 | NORDRE FOLLO |
| CW RØR AS | 825346392 | NITTEDAL |
| CZECH PRO TEAM AS | 913259122 | OSLO |
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| DAGESTAD MEKANISKE VERKSTED AS | 970975969 | RINGSAKER |
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| DAHLMANN BYGGTEKNIKK | 912282627 | ØVRE EIKER |
| DAHL-SUNDAL INGENIØRTJENESTER AS | 998182824 | ØVRE EIKER |
| DAKARK AS | 976598407 | GISKE |
| DAK & INGENIØRTJENESTER AS | 998902134 | ASKER |
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