 | CATOGEOTEKNIKK SOLBERG | 994244280 | HOLMESTRAND |
| CATOS BETONGSAGING AS | 914117321 | HOLMESTRAND |
| CATO UTBJOA | 995176211 | HÅ |
| CAVERION NORGE AS | 959069743 | OSLO |
| CBA SERVICES AS | 990666342 | OSLO |
| CB MULTIDRIFT ENTREPRENØR AS | 927074087 | NITTEDAL |
| CB RØR AS | 924780142 | TRONDHEIM |
| C/C 60 BYGGMESTER BJØRN-ANDRE LANGMO | 976072804 | LARVIK |
| C/C 60 BYGG OG TAKST AS | 931909649 | SKIEN |
| CCD EIENDOMSTJENESTER AS | 920900984 | STAVANGER |
| CC ENTREPRENØR AS | 920826075 | LILLESTRØM |
| CCL ENGINEERING NORWAY AS | 912660664 | ÅLESUND |
| CELLIN BYGGTJENESTER AS | 920314376 | TROMSØ |
| CENCO AS | 916660480 | KRISTIANSAND |
| CENTER TAKST & PROSJEKT AS | 897869322 | SKIPTVET |
| CENTRUM BYGG HORTEN AS | 965004599 | HORTEN |
| CENTRUM ELEKTRISKE AS | 912609413 | OSLO |
| CENTRUM ELEKTRO AS | 913017579 | ARENDAL |
| CENTRUM RØR AS | 986484248 | STAVANGER |
| CENTRUM RØR AS | 937684975 | DRAMMEN |
| CENTRUM VVS AS | 959198861 | ARENDAL |
| CFA RØRLEGGERBEDRIFT AS | 997749472 | GJERDRUM |
| C.F. MØLLER NORGE AS | 986519963 | OSLO |
| CF SVENDSEN AS | 820553292 | AURSKOG-HØLAND |
| CH BYGG AS | 922337292 | KRISTIANSAND |
| C.HELLING EIENDOM OG TØMRERTJENESTER AS | 925566241 | OSLO |
| CHEM-CON AS | 919305541 | SANDNES |
| CH PROSJEKT AS | 980400956 | OSLO |
| CHRICON AS | 980485013 | KRISTIANSAND |
| CHRISTENSEN CC RØRSERVICE AS | 916005024 | SANDEFJORD |
| CHRISTENSEN RØYR AS | 932742470 | SOGNDAL |
| CHRISTER SUNDSTRØM AS | 913456432 | ALTA |
| CHRISTIANIA BYGG PROSJEKT AS | 917781532 | OSLO |
| CHRISTIANIA ENTREPRENØR AS | 990132747 | OSLO |
| CHRISTIANIA ENTREPRENØR OG MASKIN AS | 915651666 | OSLO |
| CHRISTIANIA RØRLEGGERBEDRIFT AS | 912069370 | OSLO |
| CHRISTIANSEN & CHRISTIANSEN BYGG AS | 997993209 | SKIEN |
| CHRISTIANSEN OG KJENNER AS | 915949665 | ASKER |
| CHRISTIANSEN & ROBERG AS | 934014480 | TØNSBERG |
| CHRISTIAN SUNDBY ARKITEKTER AS | 917445389 | BÆRUM |
| CHRISTIE & OPSAHL AS | 974353547 | MOLDE |
| CHRISTOFFER ALEX FJELD-EIKEN | 988535842 | MOSS |
| CHRISTOFFER DANIELSEN AS | 926393146 | ØYGARDEN |
| CHRISTOFFERSEN BYGG | 931113445 | BÆRUM |
| 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 |