 | JR ANLEGG AS | 934763505 | OSLO |
| J&R BYGG AS | 921682808 | SELBU |
| JR BYGG AS | 930600954 | KRISTIANSAND |
| JR RØRSERVICE AS | 917321884 | NORDRE FOLLO |
| J S BYGG V/JAN STRØMMEGJERDE | 970452885 | SYKKYLVEN |
| JSG RØR AS | 923171401 | OSLO |
| JSI INSTALLASJON AS | 993129038 | SØR-VARANGER |
| JS MASKIN JAN SVELA AS | 829797402 | TIME |
| JSM RØRSERVICE AS | 983583830 | BERGEN |
| JSN TAKST OG VVS AS | 926432648 | EIDSVOLL |
| J S SERVICE JAN SVELA AS | 981454723 | TIME |
| JSTARKITEKTER AS | 991181369 | TRONDHEIM |
| J TANGERÅS MURERSERVICE AS | 989114778 | OSTERØY |
| J T BRATTLI BYGGSERVICE AS | 984113102 | RANA |
| J&T BYGG AS | 924467320 | TROMSØ |
| JT BYGG JAHN-TERJE NILSEN | 913025067 | BERGEN |
| JTK RØRSERVICE AS | 914950910 | TØNSBERG |
| JTM BYGG AS | 930641383 | NAMSOS |
| J. TUFTELAND AS | 941931790 | STORD |
| JULE INDUSTRIER AS | 918473076 | INDERØY |
| JULE MASKIN & SKOGSDRIFT AS | 983158749 | SKAUN |
| JULIAN KOBUS ARKITEKTKONTOR | 914330165 | BERGEN |
| JUULS RØRSERVICE AS AUT RØRLEGGERFIRMA | 943919607 | OSLO |
| JV ANLEGG AS | 912123049 | SARPSBORG |
| J&V SNEKKERE AS | 915244882 | OSLO |
| K10 BYGG KENNETH LAVIK | 911779854 | BERGEN |
| K2 ELEKTRO AS | 912110117 | OSLO |
| K3 MONTASJE AS | 919579226 | OSLO |
| KAARBY TORGER | 970150900 | TØNSBERG |
| KAARE MORTENSEN AS | 956813301 | LARVIK |
| KAARE MORTENSEN BUSKERUD AS | 993417270 | DRAMMEN |
| KAARE MORTENSEN OSLO/AKERSHUS AS | 990892229 | DRAMMEN |
| KAARUD AS | 913068920 | OSLO |
| KAASA MASKIN AS | 936537960 | MIDT-TELEMARK |
| KAAS BYGG AS | 916815166 | MALVIK |
| KAASE BYGG AS | 930341622 | TØNSBERG |
| KAAS STAALBYGG NORGE AS | 996835510 | ARENDAL |
| KÅBULAND OG STOKKELAND ELEKTRO AS | 990689660 | VENNESLA |
| KA EIENDOMSSERVICE AS | 927547244 | LØRENSKOG |
| KAHOLMEN AS | 924519401 | FREDRIKSTAD |
| KAI NOVAK | 970305122 | INDRE ØSTFOLD |
| KAI OG ANLEGG ENTREPRENØR AS | 966335645 | SORTLAND |
| KAI TORE NÆSS | 912769321 | AURSKOG-HØLAND |
| KAKKEL & PEIS SPESIALISTEN AS | 963809506 | FROGN |
| KALAND BYGG AS | 915709060 | SYKKYLVEN |
| KALAND VVS AS | 925928526 | ASKØY |
| KÅLÅS BYGG AS | 940215897 | ALVER |
| KALD & VARM INSTALLASJON AS | 917848645 | LILLESTRØM |
| KALEIDOSCOPE NORDIC AS | 914609283 | BERGEN |
| KALLAND AS | 989864882 | HAUGESUND |