 | 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 PIPESENTER AS | 995145960 | ORKLAND |
| TRØNDELAG TAK AS | 920280218 | TRONDHEIM |
| TRONDENES MASKIN AS | 925540358 | HARSTAD |
| TRØNDERBLIKK AS | 961800986 | TRONDHEIM |
| TRØNDERBLIKK INNEKLIMA AS | 919440937 | 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 |
| TRONDHEIM VVS AS | 998027160 | 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 |
| 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 |