 | JENS TREIDER SIVILARKITEKT MNAL | 970145214 | OSLO |
| JERNBETONG AS | 980835855 | MELHUS |
| JERSTAD VVS AS | 929395492 | KRISTIANSAND |
| JESS-BYGG AS | 912048039 | TYNSET |
| JESSEN RØR AS | 927345315 | HAMARØY |
| JESSHEIM VVS & VARMESERVICE AS | 922412839 | ULLENSAKER |
| JEVNE BYGG AS | 918119515 | VANG |
| J FINSTAD & Ø TEIG ANS | 980809331 | INDRE ØSTFOLD |
| J.H. BYGG OG EIENDOM AS | 932910594 | MOSS |
| J H NÆVDAL BYGG AS | 952971352 | BERGEN |
| JHS CONSTRUCTION AS | 990768617 | LARVIK |
| JIBO CONSULT JOHN INGVALD ØKLAND | 994820419 | BERGEN |
| JI BYGG AS | 971066571 | VESTBY |
| JIM HÅRE BYGGTJENESTER AS | 943512000 | SIGDAL |
| JIN MASKIN AS | 890128572 | BREMANGER |
| JJ BT AS | 928601242 | TØNSBERG |
| J JOHNSEN & SØNNER AS | 913206339 | STAVANGER |
| JK ANLEGG AS | 916723091 | GJØVIK |
| JK.ARKITEKTUR AS | 988287644 | STORD |
| JK BYGG AS | 911824779 | HARSTAD |
| JK ENTREPRENØR AS | 925752401 | OSLO |
| J & K JOHNSEN AS | 980482332 | GAUSDAL |
| J & K MASKIN AS | 995685051 | KONGSBERG |
| J K PEDERSEN BYGG OG VEDLIKEHOLD | 891133502 | STAD |
| JKR JAN KIHM RØRMONTASJE AS | 945401532 | OSLO |
| J. KVALVÅGNES AS | 992551631 | SVEIO |
| JL HYTTEBYGGEREN AS | 998376394 | NESBYEN |
| JM ANLEGG AS | 818445962 | HUSTADVIKA |
| JM ANLEGGSERVICE AS | 926880012 | SULA |
| JM FØRE AS | 928461904 | NARVIK |
| JM HANSEN AS | 995306433 | TROMSØ |
| JM JENSSEN MASKIN AS | 995198789 | SALANGEN |
| JM NORGE AS | 829350122 | OSLO |
| JMS MASKIN AS | 954466132 | TROMSØ |
| J-M SVENDSEN AS | 925263311 | MÅLSELV |
| JMT BYGG OG ANLEGG AS | 916944225 | VESTVÅGØY |
| JN RØRSERVICE AS | 998727855 | ASKER |
| JOAKIM JOHANSEN AS | 943425787 | SANDEFJORD |
| JOAR HELGE FORSAA | 990196001 | HARSTAD |
| JOB ARKITEKTER AS | 964500002 | STAVANGER |
| JODA AS | 915800424 | VESTBY |
| JØDAHL BYGG ROAR JØDAHL AS | 927027003 | ULLENSAKER |
| JØDAHL ENTREPRENØR AS | 971201916 | LILLESTRØM |
| JOHAN BREKKA ENTREPRENØRFIRMA AS | 951067660 | KRAGERØ |
| JOHAN EEK-LARSEN AS | 925786470 | BERGEN |
| JOHANNESSEN AS | 922636761 | TRONDHEIM |
| JOHANNESSEN OG HAGEN AS | 976203453 | TRONDHEIM |
| JOHANSEN BAD OG RØRSERVICE AS | 990718245 | OSLO |
| JOHANSEN BYGG & EIENDOM AS | 923143629 | FROGN |
| JOHANSEN BYGG & REHABILITERING AS | 917886679 | TRONDHEIM |