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| C&M BRANNSIKRING AS | 912854892 | TROMSØ |
| C&M FORSKALING AS | 914916887 | STAVANGER |
| CM-MASKIN AS | 933217043 | AUSTEVOLL |
| C M MATHIESEN & CO AS | 960007247 | OSLO |
| CMS BYGG OG ANLEGG AS | 923107975 | OSLO |
| CMV HOMES AS | 999524281 | OSLO |
| C MYRLID AS | 915547877 | BJØRNAFJORDEN |
| CODE ARKITEKTUR AS | 979395175 | OSLO |
| COERA AS | 932615223 | OSLO |
| COLOSS BYGG AS | 918449175 | VENNESLA |
| Combi Hus A/S | 947266594 | SANDNES |
| COMFORT AKERSHUS RØR AS | 984028865 | LILLESTRØM |
| COMFORT BJØRN SEEM AS | 916340796 | GRONG |
| 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 |
| 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 |
| CONSTRAVIA AS | 919534370 | OSLO |
| CONSTRUCTION TEAM NORWAY AS | 915449476 | FREDRIKSTAD |
| CONSTRUCTUM AS | 916263406 | FREDRIKSTAD |
| CONSULT1 AS | 916538804 | SANDNES |