 | ULVERSØY AS | 998895332 | RANDABERG |
| ULVESUND ELEKTRO AS | 981400224 | KINN |
| ULVIK KLIMAENTREPRENØR | 832515922 | BÆRUM |
| ULVIK VVS AS | 992106948 | ULVIK |
| ULVSVÅG MASKIN OG TRANSPORT AS | 988336947 | HAMARØY |
| UMBRA PRODUKTER AS | 941527272 | SANDEFJORD |
| UNDAL AS | 996399109 | HÅ |
| UNDERVERK BYGG AS | 918198946 | OSLO |
| UNDHEIM MASKIN AS | 896079212 | EIGERSUND |
| UNIGRAV AS | 818597002 | ØVRE EIKER |
| UNIHEIS AS | 936980058 | OSLO |
| UNIHOUSE SPOLKA AKCYJNA | 923351426 | |
| UNIK FILTERSYSTEM AS | 943578990 | BJØRNAFJORDEN |
| UNIK VVS AS | 977051932 | BERGEN |
| UNIMASKIN AS | 912162788 | RANA |
| UNION BYGG AS | 915048056 | OSLO |
| UNION EIENDOMSUTVIKLING AS | 935711320 | DRAMMEN |
| UNION VVS AS | 930755869 | TRONDHEIM |
| UNIQON AS | 925704172 | STORD |
| UNI RØRSERVICE AS | 925810452 | OSLO |
| UNISPORT SALTEX AS | 928176703 | INDRE ØSTFOLD |
| UNI TAK AS | 912235319 | PORSGRUNN |
| UNITEK AS | 925470449 | TRONDHEIM |
| UNNESTAD BYGG AS | 921027702 | SKIPTVET |
| UNO BYGG AS | 980620328 | KRISTIANSAND |
| UNO DESIGN & ARKITEKTUR AS | 920499902 | BODØ |
| UNU ÅLESUND AS | 931707744 | ÅLESUND |
| UNU AS | 944830642 | KINN |
| UPPSTAD VVS AVDELING HOVDEN AS | 926698435 | BYKLE |
| URBA AS | 912180921 | OSLO |
| URBAN BYGGKONSULT AS | 825048642 | OSLO |
| URBAN ELEKTRO AS | 915448887 | STRANDA |
| URBANHUS KJEDEDRIFT AS | 917791686 | HAUGESUND |
| URBANHUS SØRVEST AS | 814425312 | SANDNES |
| URBAN JUNGLE CONSULTING AS | 920221866 | OSLO |
| URD KLIMA OPPDAL AS | 980520560 | OPPDAL |
| URD KLIMA SANDNES AS | 980608646 | SANDNES |
| UREIST AS | 922171769 | BÆRUM |
| URHEIMS ELEKTROKOMPANI AS | 917027781 | BERGEN |
| URKE MASKINSERVICE AS | 914856191 | ULSTEIN |
| URLAUB IN NORWEGEN AS | 925891002 | BØMLO |
| U & S ENTREPRENØR AS | 928971279 | RINGERIKE |
| UTEANLEGG AS | 988044105 | FROGN |
| UTEROM ENTREPRENØR AS | 926136933 | LILLESTRØM |
| UTGARD ENTREPRENØR AS | 916783361 | NORD-AURDAL |
| UTNE ELEKTRO AS | 922041016 | SARPSBORG |
| UTPOST AS | 998321115 | PORSANGER |
| UTSIKT ARKITEKT OG DESIGN AS | 997234650 | TROMSØ |
| VAARDAL AS BLIKK OG VENTILASJON | 953436892 | KINN |
| VAB ARKITEKTER AS | 927642379 | INDRE ØSTFOLD |