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| TRAPPETEKNIKK AS | 986646841 | TIME |
| TRATEC TEKNIKKEN AS | 990518831 | FARSUND |
| TRB AS | 923737731 | BERGEN |
| TR-BYGGUTVIKLING AS | 976533186 | NORDRE FOLLO |
| TRE ALLSERVICE AS | 920283667 | DYRØY |
| TREARKITEKTER AS | 826915242 | OSLO |
| TRE B BYGG AS | 987234156 | STAVANGER |
| TREBETONG ENTREPRENØR AS | 952899686 | MELHUS |
| TREBO AS | 925500631 | DRAMMEN |
| TREBYGG VEST AS | 817131352 | KARMØY |
| TREBYGNING AS | 930679240 | OSLO |
| TRECO AS | 988621684 | STJØRDAL |
| TREHUS BYGGFORNYELSE AS | 927298880 | STAVANGER |
| TREHUSEKSPERTEN AS | 987814284 | VÅGÅ |
| TREHUSPARTNER AS | 868236612 | GOL |
| TRE I BYGG AS | 860147572 | NORDRE FOLLO |
| T.R EIENDOM AS | 924632763 | SARPSBORG |
| TRE INN AS | 994338625 | HEMNES |
| TREKON AS | 981943023 | NÆRØYSUND |
| TRE OG BETONG AS | 836839552 | RANA |
| 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 |