 | G. S. BYGG AS | 990336857 | DRAMMEN |
| GS BYGG OG ANLEGG AS | 917636850 | HOLMESTRAND |
| GS BYGGTECH AS | 916642741 | MIDT-TELEMARK |
| GS-DRIFT AS | 933466728 | HJELMELAND |
| GS MASKIN AS | 918912320 | DRANGEDAL |
| GS-MASKIN AS | 990555125 | KINN |
| GSN GRAVESERVICE NORD AS | 926055917 | KVÆNANGEN |
| GS STÅLBYGG AS | 929359658 | PORSGRUNN |
| GST BYGGMONTERING AS | 823672462 | ASKER |
| G-TAKK AS | 826091312 | FARSUND |
| GT-BYGG AS | 995079917 | NOTODDEN |
| GT MUR & FLIS AS | 914154677 | FREDRIKSTAD |
| GTS AS | 991238034 | HOL |
| GUDMUNDSVEEN AS | 998303036 | VESTRE TOTEN |
| GUDØY GRAVESERVICE AS | 925263443 | RÅDE |
| GUERICKE ENGINEERING AS | 917411492 | FÆRDER |
| GULBRANDSEN BYGG | 999639623 | FREDRIKSTAD |
| GULBRANDSEN & OLIMB AS | 879296242 | OSLO |
| GULCON AS | 922128693 | ASKER |
| GULEN BLIKK OG VEDLIKEHOLD AS | 922347883 | GULEN |
| GULLHAGEN ANLEGGSDRIFT AS | 988415472 | ÅL |
| GULLICHSEN AS | 925884359 | ENEBAKK |
| GULLI MASKIN AS | 927547244 | LØRENSKOG |
| GULVBETONG AS | 992699612 | TRONDHEIM |
| GULV OG MAL AS | 985185042 | HEIM |
| GULV OG TAK AS | 936130364 | SANDNES |
| GUNDERSEN & GRIMSMO AS | 933763927 | HALDEN |
| GUNDERSEN MASKINSERVICE AS | 989234706 | LILLEHAMMER |
| GUNDERSEN MASKIN & TRANSPORT AS | 980882500 | TROMSØ |
| GUNDERSEN SVEN | 870371772 | BERGEN |
| GUNGE VVS AS | 918777520 | TROMSØ |
| GUNNAR BAKKEN | 919451890 | LARVIK |
| GUNNAR BROVIG | 959404062 | LILLESAND |
| GUNNAR DAHLE | 970295070 | TOKKE |
| GUNNAR FOSSLI | 913302060 | SANDEFJORD |
| GUNNAR HOGNERUD AS | 982894638 | HOL |
| GUNNAR JAKOBSEN AS | 998366380 | LINDESNES |
| GUNNAR KIND AS | 983762433 | OSLO |
| GUNNAR LEIKVOLD AS | 974470667 | NESODDEN |
| GUNNAR L HANSEN OG SØNN DA | 952947885 | OSLO |
| GUNNAR RESE AS | 987884959 | ASKER |
| GUNNERUD ENTREPRENØR AS | 924957670 | SIGDAL |
| GUNNLEIF FJOGSTAD MASKIN AS | 913854934 | KLEPP |
| GUNVALD JOHANSEN BYGG AS | 987597887 | BODØ |
| GUNVALD JOHANSEN BYGG LOFOTEN AS | 934809874 | VESTVÅGØY |
| GUNVALDSEN & SØNN AS | 911639130 | NORDRE FOLLO |
| GUSTAD AS | 995223074 | AVERØY |
| GUSTAV EIENDOM DRIFT AS | 912099849 | OSLO |
| GUSTAV OLSEN ENTREPRENØRFORRETNING AS | 927958910 | LINDESNES |
| GUSTAVSEN RØR AS | 923842829 | LARVIK |