 | CASPER HJELL AS | 979802412 | NORDRE FOLLO |
| CASTEL BYGG AS | 928084779 | TØNSBERG |
| CASTOR MEKANISKE AS | 998354137 | OSLO |
| CATO BERNTSEN AS | 991052313 | LILLESTRØM |
| CATOS BETONGSAGING AS | 914117321 | HOLMESTRAND |
| CATO UTBJOA | 995176211 | HÅ |
| CAV AS | 926401823 | MIDT-TELEMARK |
| CAVERION NORGE AS | 959069743 | OSLO |
| CB MULTIDRIFT ENTREPRENØR AS | 927074087 | NITTEDAL |
| CB RØR AS | 924780142 | TRONDHEIM |
| C/C 60 BYGGMESTER BJØRN-ANDRE LANGMO | 976072804 | LARVIK |
| CC BYGGSERVICE AS | 933647285 | VESTBY |
| CCD EIENDOMSTJENESTER AS | 920900984 | STAVANGER |
| CC ENTREPRENØR AS | 920826075 | LILLESTRØM |
| CCL ENGINEERING NORWAY AS | 912660664 | ÅLESUND |
| CENCO AS | 916660480 | KRISTIANSAND |
| CENTER TAKST & PROSJEKT AS | 897869322 | SKIPTVET |
| CENTRUM BYGG HORTEN AS | 965004599 | HORTEN |
| CENTRUM ELEKTRISKE AS | 912609413 | OSLO |
| CENTRUM RØR AS | 937684975 | DRAMMEN |
| CENTRUM RØR AS | 986484248 | STAVANGER |
| 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 |
| 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 |
| CHRISTFAM AB NUF | 986113231 | INDRE ØSTFOLD |
| 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 NORDANG AS | 974353547 | MOLDE |
| CHRISTOFFER ALEX FJELD-EIKEN | 988535842 | MOSS |
| CHRISTOFFER DANIELSEN AS | 926393146 | ØYGARDEN |
| CHR M VESTRHEIM AS | 917154678 | BERGEN |
| CHROST MATI BYGG AS | 812784862 | SØNDRE LAND |
| CH STADLER KFT | 989688030 | |
| CIBES LIFT NORGE AS | 913117972 | ASKER |
| CITY RØR AS | 989714023 | OSLO |
| CITY TAKTEKKING AS | 911065290 | OSLO |
| CIVIL ENGINEERING CONSULTANCY AS | 991851607 | ÅSNES |
| CK NOR BYGG AS | 912418804 | SANDEFJORD |
| C KRISTOFFERSEN & SØNN AS | 985309604 | HORTEN |
| CLAESSEN & JOHNSEN AS | 994593390 | SUNNDAL |
| CLASSIC BAD AS | 929618793 | BERGEN |
| CL BYGG & EIENDOM AS | 917283109 | HOLMESTRAND |
| CLEVE BROCH AS | 998990122 | BÆRUM |
| C&M BRANNSIKRING AS | 912854892 | TROMSØ |
| C&M FORSKALING AS | 914916887 | STAVANGER |
| CM-MASKIN AS | 933217043 | AUSTEVOLL |
| C M MATHIESEN & CO AS | 960007247 | OSLO |
| CMO ENGINEERING AS | 923709088 | FREDRIKSTAD |
| CMT BYGG AS | 935807115 | OSLO |
| CMV HOMES AS | 999524281 | OSLO |
| C MYRLID AS | 915547877 | BJØRNAFJORDEN |
| CO2OLTEC COMMERCIAL REFRIGERATION NORWAY AS | 981495977 | OSLO |
| 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 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 |
| 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 |