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| TRESPOR AS | 935821959 | LILLEHAMMER |
| 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 |
| TRIO BETONG AS | 922689830 | LIER |
| TRIO BYGG AS | 987620552 | VERDAL |
| TRIO-BYGG AS | 942687257 | TRONDHEIM |
| TRIO HUS AS | 977388422 | KRISTIANSUND |
| TRIVELIG HJEM BYGG OG EIENDOM AS | 935213908 | HARSTAD |
| TRIVO AS | 919281111 | OPPDAL |
| TR NÆRINGSBYGG AS | 924632763 | SARPSBORG |
| TRØAN VVS AS | 935348498 | TRONDHEIM |
| TRODAHL ARKITEKTER AS | 925539937 | SANDNES |
| T RØDSTEN VVS AS | 957644759 | TRONDHEIM |
| TROFOS - TRONDHEIM FLIS OG SNEKKER AS | 934491467 | TRONDHEIM |
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| TROLLBYGG AS | 833909622 | GRONG |
| TROLL ELEMENTER AS | 934817559 | LARVIK |
| TROLL ENTREPRENØR AS | 997970977 | LEVANGER |
| TROLLHEIMEN BYGG AS | 933611981 | ALVER |
| TROLLVEGG ARKITEKTSTUDIO AS | 991688285 | KRISTIANSAND |
| TRØMBORG ARKITEKTER FRANK ANDRE BJØRNSEN | 985624917 | DRAMMEN |
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| TROMSBYGG ENTREPRENØR AS | 913284836 | BALSFJORD |
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| TROMSØ BERGSPRENGING AS | 920714005 | TROMSØ |
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| TROMSØ BRANNKONSULT AS | 835678172 | VESTVÅGØY |
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| TROMSØ KOMMUNE BYDRIFT | 974566125 | TROMSØ |
| TROMS TAKST AS | 979286015 | TROMSØ |
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| TRØNDELAG TAK AS | 920280218 | TRONDHEIM |
| TRONDENES MASKIN AS | 925540358 | HARSTAD |
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| 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 | 935505836 | 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 |
| TROSTEN CONSULT AS | 928779289 | TANA |
| TR-SERVICE AS | 911792389 | KRISTIANSAND |
| TRUDE NORDDAL ARKITEKTUR AS | 931628607 | TRONDHEIM |
| TRULS & PETTER RØRLEGGERSERVICE AS | 985820872 | BERGEN |
| TRULSSEN MASKIN AS | 996454037 | MÅLSELV |
| TRULS TØRRISPLASS AS | 990021945 | NESBYEN |
| TRYCM AS | 936603866 | KRISTIANSAND |
| TRYGGBYGG AS | 836095812 | VESTRE TOTEN |
| TRYGG BYGG&RØR AS | 930579890 | OSLO |
| TRYGG ELEKTRO AS | 922409692 | OSLO |
| TRYGG PÅ BYGG AS | 935663512 | KRISTIANSAND |
| TRYGG VVS AS | 998380448 | OSLO |
| TRYGVE ESPELAND MURARFORRETNING AS | 965853944 | SOGNDAL |
| TRYGVE RYE-JOHNSON AS | 913181271 | SANDEFJORD |
| TRYGVE ULLALAND AS | 979734689 | KINN |
| TRY RØR AS | 981957075 | KRISTIANSAND |
| TRYSIL ENTREPRENØR AS | 921005121 | TRYSIL |
| TRYSIL FLIS & MALERSENTER AS | 977165539 | TRYSIL |
| TRYSIL PUKKVERK AS | 995976285 | TRYSIL |