 | COMFORT BRYN AS | 985160759 | OSLO |
| COMFORTBUTIKKEN RØRSENTERET AS | 977362407 | OPPDAL |
| COMFORTBUTIKKEN SKØYEN AS | 963173784 | OSLO |
| COMFORT EGERSUND AS | 990474303 | EIGERSUND |
| COMFORT ELEKTRO AS | 830946152 | OSLO |
| COMFORT HARSTAD AS | 992985151 | HARSTAD |
| COMFORT STORO AS | 985470871 | OSLO |
| COMMON GROUND AS | 916053959 | OSLO |
| COMPLETT MUR OG FLIS AS | 899588142 | BJØRNAFJORDEN |
| COMSAFE AS | 898507092 | FREDRIKSTAD |
| CONBYGG AS | 816973732 | KONGSVINGER |
| CONCRETE DESIGN AS | 911641720 | OSLO |
| CONCRETE STRUCTURES AS | 995981742 | BÆRUM |
| CONCRETI AS | 929046552 | LILLEHAMMER |
| CON-FORM AS | 931419323 | OSLO |
| CON-FORM BERGEN AS | 978650783 | ØYGARDEN |
| CONKRET AS | 929798945 | TRONDHEIM |
| CONNECT ELECTRO AS | 898010112 | OSLO |
| CONPLAN AS | 987895276 | ULSTEIN |
| CONRAD BYGG AS | 912282570 | VÅGAN |
| CONSEM ENTREPRENØR AS | 987474742 | RÅDE |
| CONSISU AS | 998317649 | BÆRUM |
| CONSOLVO AS | 944024875 | LIER |
| CONSTA AS | 931556444 | OSLO |
| CONSTANT BYGG AS | 821572282 | KONGSBERG |
| CONSTO ANLEGG NORD AS | 917330069 | BODØ |
| CONSTO ANLEGG ØST AS | 916505000 | LILLESTRØM |
| CONSTO ANLEGG SØR AS | 922203652 | ARENDAL |
| CONSTO ANLEGG VEST AS | 926327542 | BERGEN |
| CONSTO AS | 995754606 | TROMSØ |
| CONSTO BERGEN AS | 987769580 | BERGEN |
| CONSTO DAMBYGG AS | 918481613 | KVINNHERAD |
| CONSTO ØST AS | 997558146 | ASKER |
| CONSTRAVIA AS | 919534370 | OSLO |
| CONSTRO AS | 816696852 | ASKER |
| CONSTRUCTION TEAM NORWAY AS | 915449476 | FREDRIKSTAD |
| CONSTRUCTUM AS | 916263406 | FREDRIKSTAD |
| CONSULT1 AS | 916538804 | SANDNES |
| CONSULT GRUPPEN AS | 925747424 | KRISTIANSAND |
| CONTEXT AS | 987545151 | TINN |
| CONTRACTOR BYGG AS | 911644835 | ALSTAHAUG |
| CONTRE AS | 928997944 | GAUSDAL |
| CONTUR AS | 927612372 | KRISTIANSAND |
| CONTURO AS | 931081705 | TØNSBERG |
| CONVA AS | 931051857 | HORTEN |
| CON-WOOD-STEEL AS | 925407399 | ASKØY |
| COOLTEAM AS | 988373354 | OSLO |
| COOLTEAM BERGEN AS | 915619878 | BERGEN |
| COPLAN AS | 916139101 | BERGEN |
| CORE ARKITEKTUR AS | 925075345 | BERGEN |