 | KARLSEN & NORDSETH ENTREPRENØR AS | 985214034 | NITTEDAL |
| KARLSEN VVS AS | 997023277 | LILLESTRØM |
| KARLSHUSGARASJENE AS | 970601635 | RÅDE |
| KARLSSONS GRAVE OG VEDLIKEHOLD AS | 984064713 | NITTEDAL |
| KARLSSON & SVARTEDAL TØMRERMESTERFORRETNING ANS | 868602422 | NITTEDAL |
| KARLSTADS RØR & VARME / Bjørn H.Karlstad | 989475428 | RINGEBU |
| KARMØY RØRTEKNIKK AS | 993234532 | KARMØY |
| KARMSUND BYGG AS | 925720860 | KARMØY |
| KARSTEIN KRISTIANSEN ENTREPRENØR AS | 962231551 | ANDØY |
| KARTEVOLL AS | 913338383 | KRISTIANSAND |
| KARTVEIT & HEGGØY BRANNSIKKERHET AS | 819546622 | OSLO |
| KÅSA & RINGHUS ENTREPRENØR AS | 891336802 | VINJE |
| KASPAR STRØMME AS | 916369824 | KRISTIANSAND |
| KATO BYGG SERVICE AS | 913158296 | BERGEN |
| KAUTOMASKIN AS | 983168272 | KAUTOKEINO |
| KAY BETONGSAGING AS | 980246930 | HÅ |
| KB ARKITEKTER AS | 982795710 | TØNSBERG |
| KB BLIKK AS | 914341922 | NITTEDAL |
| KB BYGG AS | 812055372 | GILDESKÅL |
| KB ELEKTRO AS | 948625563 | STANGE |
| K.B ENTREPRENØR OG EIENDOM AS | 917716234 | ØSTRE TOTEN |
| KB MASKIN AS | 990477493 | SKIEN |
| K.BØ MASKIN AS | 913577019 | RANDABERG |
| K.B.S AS | 912378233 | OSLO |
| KBS KLIMA OG BYGGSERVICE AS | 886416962 | NORDRE FOLLO |
| KB SPENNTEKNIKK AS | 966074035 | KONGSVINGER |
| KB TAKST AS | 814787192 | PORSGRUNN |
| KC BYGG AS | 988807494 | LILLESAND |
| KD BETONGBYGG AS | 925852570 | NORD-FRON |
| KEBA CONSULT AS | 827011592 | ÅSNES |
| KEIL | 988729329 | BÆRUM |
| KELLER GEOTEKNIKK AS | 922736340 | OSLO |
| KELVIN AS | 966777001 | BÆRUM |
| KEM PROSJEKT AS | 827589772 | STEINKJER |
| KENNETH A.V. HILAN | 911928043 | STJØRDAL |
| KENNETH EGGAN AS | 911953633 | TRONDHEIM |
| KENNETH LUNDE | 916541562 | SARPSBORG |
| KENNETH NORMANN HANSEN | 977187826 | LARVIK |
| KENT ERICHSEN AS | 925262331 | SARPSBORG |
| KEPLA AS | 983792685 | BERGEN |
| KEROC AS | 912380912 | OSLO |
| KESS VVS AS | 928099946 | ASKØY |
| KES-TEKNIKK AS | 913279557 | SURNADAL |
| KETIL ANDRE ASBJØRNSEN | 970932062 | FREDRIKSTAD |
| KFKPROSJEKT AS | 932373386 | FÆRDER |
| KG BYGGKONSULT AS | 911945118 | HVALER |
| KG BYGG OG BETONG AS | 994241613 | HOL |
| KGC NORWAY AS | 827902632 | OSLO |
| KG ELEKTRO AS | 991882979 | ALVER |
| KG SNEKKERSERVICE AS | 912306542 | BRØNNØY |