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| KLAUSENGRUPPEN AS | 937808623 | SORTLAND |
| KLAVESTAD-ENTREPRENØR AS | 997887085 | SARPSBORG |
| KL-BYGG AS | 922164460 | SANDEFJORD |
| K.L.BYGG & HÅNDVERKERTJENESTER AS | 920972861 | SØNDRE LAND |
| KLEIVDAL TAKSERING AS | 916271654 | ALVER |
| KLEIVEN SOGN AS | 945647922 | ÅRDAL |
| KLEIVO NÆRING AS | 988927325 | STORD |
| KLEPPE BYGGSERVICE AS | 919312874 | ØYGARDEN |
| KLEPPSETER ANLEGG AS | 921069693 | BAMBLE |
| K LERVIK AS | 970943188 | HEIM |
| KLEVELAND AS | 976925122 | KRISTIANSAND |
| KLEVELAND'S UTEMILJØ AS | 989376357 | TRONDHEIM |
| KLEVEN BYGG OPPDAL AS | 916038046 | OPPDAL |
| KLEVSTAD RØRSERVICE AS | 921054971 | BERGEN |
| KLIMABYGG AS | 923829962 | BERGEN |
| KLIMA ENERGI OG VENTILASJON AS | 915109632 | MOLDE |
| KLIMA EXPERTEN AS | 993271160 | KINN |
| KLIMA OG BYGG AS | 988106542 | OSLO |
| KLIMA OG ENERGITEKNIKK AS | 950086122 | SAUDA |
| KLIMASERVICE AS | 939275150 | BARDU |
| KLIMASERVICE AS | 933956075 | SANDNES |
| KLIMASERVICE MODUM AS | 999235948 | MODUM |
| KLIMASERVICE OSLO AS | 915440622 | OSLO |
| KLIMATEKNIKK AS | 970982221 | BERGEN |
| KLINGEN MASKINENTREPRENØR AS | 912027228 | NAMSOS |
| KLINGSHEIM MASKIN AS | 990027765 | KLEPP |
| KLOPHUS BYGG AS | 922569460 | GAUSDAL |
| K LUND AS | 917810346 | TRONDHEIM |
| KLUNGTVEIT MASKIN AS | 914735882 | SULDAL |
| KLW AS | 989477927 | KARMØY |
| KM ANLEGG AS | 915099165 | SANDEFJORD |
| KM BYGG ENTREPRENØR AS | 912026353 | TRONDHEIM |
| KM GRUNNMUR AS | 915076718 | ØVRE EIKER |
| KMK ENTREPRENØR AS | 917316783 | LILLESTRØM |
| KM PROFF BYGG AS | 927988798 | SENJA |
| KM RØRSERVICE AS | 999509819 | LØRENSKOG |
| KMS ARKITEKTER AS | 938984263 | HORTEN |
| KM VENTILASJON AS | 933098427 | BERGEN |
| KNAPPEN SJØ AS | 882104192 | ØYGARDEN |
| KNEM OG NÆSVIK AS | 982409829 | OSLO |
| KN ENTREPRENØR AS | 990944377 | HITRA |
| KN MASKIN AS | 990311684 | LØDINGEN |
| KNOPH VVS & GASSTEKNIKK AS | 984305451 | SOLA |
| K. NORDANG AS | 936574696 | STRANDA |
| KNU BYGG OG RENOVERING AS | 824461732 | BÆRUM |
| KNUT AARUM AS | 839093322 | INDRE ØSTFOLD |
| KNUT BJERKE AS | 910611879 | VÅLER (ØSTFOLD) |
| KNUT EINAR HELGELAND | 982850657 | LARVIK |
| KNUT ERIK GJERDE | 969080303 | VINDAFJORD |