 | TRONDHEIM MURSERVICE AS | 986631305 | TRONDHEIM |
| TRONDHEIM STÅL AS | 952272462 | MELHUS |
| TRONDHEIM TAK AS | 988608343 | TRONDHEIM |
| TRONDHEIM VENTILASJON AS | 928060195 | TRONDHEIM |
| TRONDHEIM WORKS AS | 929555120 | TRONDHEIM |
| TRONDHJEM BOLIG AS | 926592939 | TRONDHEIM |
| TROND MARTENS SIVILARKITEKT | 984702906 | DRAMMEN |
| TROND M RUUD OLSEN | 970464506 | STANGE |
| TROND WEAN | 974398575 | INDRE FOSEN |
| TRONES MASKIN AS | 818697902 | VESTVÅGØY |
| TRONFJELL MASKIN AS | 914103509 | ALVDAL |
| TRØNNES BYGG AS | 912155455 | FOLLDAL |
| TRONRUD BETONG AS | 923581421 | HOLMESTRAND |
| TRONRUD EIENDOM AS | 942984154 | RINGERIKE |
| TRONSLIEN AS | 966026294 | OSLO |
| T-RØR AS | 918281460 | LEVANGER |
| TROSVIK ENERGY AS | 920451314 | RISØR |
| TR-SERVICE AS | 911792389 | KRISTIANSAND |
| T.R SUNDLI | 927055945 | RINGSAKER |
| TRULS & PETTER RØRLEGGERSERVICE AS | 985820872 | BERGEN |
| TRULS TØRRISPLASS AS | 990021945 | NESBYEN |
| TRYGG BYGG&RØR AS | 930579890 | OSLO |
| TRYGG ELEKTRO AS | 922409692 | OSLO |
| TRYGG ENTREPRENØR AS | 925957054 | BÆRUM |
| TRYGG RØRSERVICE AS | 929783832 | KONGSBERG |
| TRYGG VVS AS | 998380448 | OSLO |
| TRYGVE ESPELAND MURARFORRETNING AS | 965853944 | SOGNDAL |
| TRYGVE RYE-JOHNSON AS | 913181271 | SANDEFJORD |
| TRYGVE ULLALAND AS | 979734689 | KINN |
| TRYM ANLEGG AS | 925751189 | TRONDHEIM |
| TRYM BYGG AS | 925751170 | TRONDHEIM |
| TRY RØR AS | 981957075 | KRISTIANSAND |
| TRYSIL ENTREPRENØR AS | 921005121 | TRYSIL |
| TRYSIL FLIS & MALERSENTER AS | 977165539 | TRYSIL |
| TRYSIL PUKKVERK AS | 995976285 | TRYSIL |
| TRYSIL RØRLEGGERBEDRIFT AS | 931264745 | TRYSIL |
| TS BOLIG AS | 929465261 | ØVRE EIKER |
| T.S.B. SNEKKER AS | 919166274 | MOSS |
| T&S BYGG AS | 931978047 | NORDRE FOLLO |
| TS BYGG MODUM AS | 996467023 | MODUM |
| TS ELEMENTER AS | 918070028 | LARVIK |
| TS HÅNDVERK AS | 998580781 | ASKER |
| TST MASKIN AS | 812303902 | SUNNFJORD |
| TS TØMRERSERVICE AS | 820988132 | INDRE ØSTFOLD |
| TT ANLEGG AS | 916687435 | LINDESNES |
| T & T BYGG AS | 990057222 | HORTEN |
| TT BYGG AS | 994830236 | SANDNES |
| TT BYGGDRIFT AS | 926370502 | SANDNES |
| TT KABEL & ANLEGG AS | 995986655 | ÅSNES |
| TTM AS | 921154194 | LIER |