 | ELEKTRO-SIVERT INSTALLASJON AS | 958955073 | OSLO |
| ELEMENT ARKITEKTER AS | 981319656 | OSLO |
| ELIAS TSCHERNUTTER ARKITEKTUR | 930772739 | OSLO |
| ELITE ELEKTROENTREPRENØR AS | 829730782 | OSLO |
| ELLINGARD MUR AS | 930272086 | OSLO |
| ELLINGARD NATURSTEIN AS | 971155949 | OSLO |
| ELMANN AS | 980872041 | OSLO |
| ELTEL NETWORKS AS | 912955915 | OSLO |
| EMBARK AS | 942530501 | OSLO |
| EMBLA BYGG AS | 987756292 | OSLO |
| EM RØR AS | 998431085 | OSLO |
| ENERGI & MILJØTEKNIKK AS | 920125158 | OSLO |
| Enerhaugen Arkitektkontor AS | 937009984 | OSLO |
| ENERLYS' RØRSERVICE AS | 928522059 | OSLO |
| ENTAS AS | 988121053 | OSLO |
| ENTREPRENØR SVEIN ROMMEN AS | 838371272 | OSLO |
| ENVIECO AS | 924602007 | OSLO |
| ENVIRO ENTREPRENØR AS | 917995427 | OSLO |
| ENWA BADEANLEGG AS | 946973831 | OSLO |
| EPTEC Energi AS | 957492258 | OSLO |
| EQUIENT AS | 817523552 | OSLO |
| ERIK LANGDALEN ARKITEKTKONTOR AS | 980714454 | OSLO |
| ERIKSEN & JENSEN AS | 940266009 | OSLO |
| ERLING SVENSSON | 921032447 | OSLO |
| ESO ENTREPRENØR AS | 997981715 | OSLO |
| EUROSIGN AS | 975840905 | OSLO |
| EXACT GEO SURVEY AS | 974679442 | OSLO |
| F8 ENTREPRENØR AS | 922693471 | OSLO |
| FABEL ARKITEKTER AS | 935012252 | OSLO |
| FAGBYGG AS | 920830390 | OSLO |
| FAGMESTER VVS AS | 914451868 | OSLO |
| FAST VVS AS | 931693913 | OSLO |
| FAUN GRUPPEN AS | 920318479 | OSLO |
| FAUN MONTASJE AS | 997626923 | OSLO |
| FAUZINI ARKITEKTER AS | 916547013 | OSLO |
| FAX ARKITEKTER AS | 931080652 | OSLO |
| FH BYGGCONSULT AS | 998230748 | OSLO |
| FILTER ARKITEKTER AS | 881196042 | OSLO |
| FJELDÅSHEIM & NILSEN AS | 911922347 | OSLO |
| FJORD INGENIØRER AS | 912716694 | OSLO |
| FLEXIBLE BUILDING SYSTEM NORWAY AS | 922176485 | OSLO |
| FLOVILD ELEKTRO AS | 911728516 | OSLO |
| FLOW KLIMA OSLO AS | 929599373 | OSLO |
| FLUSH-VVS AS | 998620635 | OSLO |
| FLYT ENTREPRENØR AS | 911944502 | OSLO |
| FLYTLANDSKAP AS | 929458990 | OSLO |
| FLYT RØR AS | 925439703 | OSLO |
| FOCUS ELEKTRO AS | 983939201 | OSLO |
| FOFO AS | 920953034 | OSLO |
| FOGK BYGGMESTER AS | 931580620 | OSLO |