 | TREPRO AS | 911601990 | MELHUS |
| TRESBYGG AS | 998396751 | TRONDHEIM |
| TRESCON AS | 918943358 | SKIEN |
| TRESTANDARD BYGG AS | 994495461 | OSLO |
| TRE TEAM ENTREPRENØR AS | 966419482 | VÅGAN |
| TRE TOMMER AS | 925047589 | INDRE ØSTFOLD |
| TRETTEN BLIKKENSLAGER OG RØRLEGGER AS | 967418153 | ØYER |
| TRETTEN BYGGSERVICE AS | 918311610 | ØYER |
| TRETTSVEEN BYGG AS | 917458219 | GJØVIK |
| TREVERKET AS | 921463529 | STAVANGER |
| TRG-ELEKTRO AS | 921785062 | OSLO |
| TRH UTVIKLING AS | 912715825 | TRONDHEIM |
| TRIBO AS | 948651262 | BÆRUM |
| TRICO BYGG AS | 997134435 | SANDNES |
| TRIFOLIA AS | 998098688 | OSLO |
| TRINN FOR TRINN ENTREPRENØR AS | 918524843 | DRAMMEN |
| TRIO BETONG AS | 922689830 | LIER |
| 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 |