 | TRADISJONSBYGG ENTREPRENØR AS | 980685357 | RINGEBU |
| TRADISJONSHÅNDVERK AS | 924775807 | ARENDAL |
| TRADISJONSLAFT AS | 884784492 | ØYSTRE SLIDRE |
| TRAFO ARKITEKTUR AS | 895844942 | ARENDAL |
| TRAKTOR & GRAVEMASKINDRIFT AS | 986719709 | ØSTRE TOTEN |
| TRAKTOR OG VAKTMESTERTJENESTER AS | 920925480 | DOVRE |
| TRAKTOR TERJE AS | 915342051 | TANA |
| TRANBY AS | 986358722 | BÆRUM |
| TRANBY TØMRERNE AS | 922047944 | LIER |
| TRANGVIK MASKIN AS | 988131121 | TOLGA |
| TRANSBORDER STUDIO AS | 990530327 | OSLO |
| TRANSGRAV AS | 968777408 | ENEBAKK |
| TRANSTEMA G-TRENCH AS | 923136398 | LØRENSKOG |
| TRANSTEMA MOBILE AS | 998839440 | BÆRUM |
| 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 |
| 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 |