 | TRIO BYGG AS | 987620552 | VERDAL |
| TRIO-BYGG AS | 942687257 | MELHUS |
| TRIO HUS AS | 977388422 | KRISTIANSUND |
| TRIVO AS | 919281111 | OPPDAL |
| TRODAHL ARKITEKTER AS | 925539937 | SANDNES |
| T RØDSTEN VVS AS | 957644759 | TRONDHEIM |
| TROLL ARKITEKTUR AS | 994973975 | OPPDAL |
| TROLL ENTREPRENØR AS | 997970977 | LEVANGER |
| TROLLVEGG ARKITEKTSTUDIO AS | 991688285 | KRISTIANSAND |
| TROLL VILLMARK AS | 895921912 | ÅSERAL |
| TROMEK SERVICE AS | 918093079 | TRONDHEIM |
| TROMS BLIKKENSLAGER AS | 917338477 | NORDREISA |
| TROMSBYGG ENTREPRENØR AS | 913284836 | BALSFJORD |
| TROMS BYGGMONTERING AS | 985638012 | TROMSØ |
| TROMSDALEN BYGG AS | 922062722 | TROMSØ |
| TROMSDALEN ELEKTRO AS | 995750090 | TROMSØ |
| TROMS MINIMASKINER Knut Magne Olsen | 984242220 | SENJA |
| TROMSØ BERGSPRENGING AS | 920714005 | TROMSØ |
| TROMSØ BETONG TEAM AS | 921440219 | TROMSØ |
| TROMSØ BYGG SERVICE AS | 954480011 | TROMSØ |
| TROMSØ ENTREPRENØR AS | 987248270 | EVENES |
| TROMSØ KOMMUNE BYDRIFT | 974566125 | TROMSØ |
| TROMSØ TAKMONTERING AS | 855528762 | TROMSØ |
| TROMS TAKST AS | 979286015 | TROMSØ |
| TROND ABRAHAMSEN VVS AS | 917650128 | OSLO |
| TROND ARNE JENSEN AS | 930719374 | BAMBLE |
| TROND AUNE MASKINSTASJON AS | 988950173 | ÅFJORD |
| TRØNDELAG BETONG AS | 917255342 | LEVANGER |
| TRØNDELAG BYGGTJENESTER AS | 918865691 | LEVANGER |
| TRØNDELAG ENTREPRENØR AS | 996829286 | VERDAL |
| TRØNDELAG FJELL & ANLEGG AS | 930575771 | MIDTRE GAULDAL |
| TRØNDELAG FORSKALING AS | 971579781 | VERDAL |
| TRØNDELAG FRESESERVICE AS | 829346672 | TRONDHEIM |
| TRØNDELAG MUR OG FLISSERVICE AS | 996350762 | TRONDHEIM |
| TRØNDELAG PIPESENTER AS | 995145960 | ORKLAND |
| TRØNDELAG TAK AS | 920280218 | TRONDHEIM |
| TRONDENES MASKIN AS | 925540358 | HARSTAD |
| TRØNDERBLIKK AS | 961800986 | TRONDHEIM |
| TRØNDERELEMENT AS | 987692472 | FLATANGER |
| TRØNDERMUREREN FRODE EGGEN | 991868712 | TRONDHEIM |
| TRØNDERPLAN AS | 946481599 | NAMSOS |
| TRØNDER-SVEIS AS | 947708597 | MELHUS |
| TROND HEDLAND AS | 951083305 | SANDNES |
| TROND HEGGLAND AS | 982098947 | BERGEN |
| TRONDHEIM BAD OG BYGGTEKNIKK AS | 926641514 | TRONDHEIM |
| TRONDHEIM EL AS | 915492649 | TRONDHEIM |
| TRONDHEIM MURSERVICE AS | 986631305 | TRONDHEIM |
| TRONDHEIM STÅL AS | 952272462 | MELHUS |
| TRONDHEIM TAK AS | 988608343 | TRONDHEIM |
| TRONDHEIM VENTILASJON AS | 928060195 | TRONDHEIM |