 | RØRSENTERET KONGSBERG AS | 914481333 | KONGSBERG |
| RØRSENTERET RØDBERG AS | 976803760 | NORE OG UVDAL |
| RØRSERVICE AS | 925818542 | RINDAL |
| RØRSERVICE NESBYEN AS | 993121339 | NESBYEN |
| RØRSERVICE ØRSTA AS | 929262670 | ØRSTA |
| RØRSPESIALIST 1 AS | 994069144 | AVERØY |
| RØR & SPRINKLER COMPANIET AS | 985475822 | RÆLINGEN |
| RØRSTAD BYGG AS | 994264478 | VOLDA |
| RØR & SVEISESERVICE AS | 929470494 | SARPSBORG |
| RØR SYSTEM AS | 996754316 | OSLO |
| RØR SYSTEM RENKAW | 932842041 | OSLO |
| Rørteam AS | 931046233 | GJERDRUM |
| RØRTEAMET AS | 932433745 | MOSS |
| RØRTEC AS | 937560753 | RAKKESTAD |
| RØRTEFT AS | 975983862 | LILLESTRØM |
| Rør Tek A/S | 946279900 | STEINKJER |
| RØRTEK HAMMERFEST AS | 930067571 | HAMMERFEST |
| RØRTEKNIKK AS | 984047673 | STJØRDAL |
| RØRTEKNIKK VVS AS | 974281023 | OSLO |
| RØRTEK SØR AS | 931118889 | KRISTIANSAND |
| RØRTEMA AS | 914622077 | LILLESTRØM |
| RØRTEMA PROSJEKT AS | 931352725 | LILLESTRØM |
| RØRTJENESTEN AS | 998185823 | MELHUS |
| RØRTJENESTE NORD AS | 991534903 | NORDREISA |
| RØR & VARME AS | 956517397 | OSLO |
| RØRVERKET AS | 991845771 | OSLO |
| ROSBACH & FORSLAND BYGG AS | 930829382 | SKIEN |
| RØSBJØRGEN BYGG AS | 921422393 | MELHUS |
| ROSENDAL BYGG AS | 926969730 | TRONDHEIM |
| ROSENENG MASKIN AS | 919187093 | PORSANGER |
| ROSENGREN BYGG AS | 995209888 | STAVANGER |
| ROSENMEYER AS | 923119426 | NARVIK |
| ROSER BOLIG AS | 921142358 | TØNSBERG |
| ROSER RØR | 969958651 | NESODDEN |
| RØSET AS | 997327837 | SELBU |
| ROSLAND BYGG | 997768493 | BAMBLE |
| ROSMEK AS | 986680829 | NITTEDAL |
| ROSMO AS | 989188488 | TRONDHEIM |
| RØSSNES MASKIN AS | 918852883 | FÆRDER |
| ROSS SNEKKERTJENESTER AS | 986994653 | MELHUS |
| RØSTAD ENTREPRENØR AS | 963199724 | VERDAL |
| RØTA AS | 988937509 | HOL |
| ROVIK BYGG AS | 930855480 | SANDNES |
| RØVIK MULTISERVICE AS | 921715595 | STJØRDAL |
| ROX MASKIN AS | 922877610 | ALTA |
| ROYAL RØRLEGGER SERVICE AS | 923803416 | OSLO |
| ROY KENNETH BYBERG | 970361030 | KLEPP |
| RØYNSTRAND ENTREPRENØR AS | 987020075 | ULLENSVANG |
| ROY PAULSEN | 976290690 | ARENDAL |
| RØYRLEGGJAR INGMAR FIMREITE AS | 965112170 | SOGNDAL |