 | AS REALBYGG | 950525932 | OSLO |
| AS RØRLEGGER | 815589602 | OSLO |
| ASTAD ARKITEKTUR AS | 920575307 | OSLO |
| AT CONSULT LARISA KARTASHEVA | 915712754 | OSLO |
| ATEAM INNEKLIMASERVICE AS | 982175577 | OSLO |
| ATELIER OSLO AS | 994734938 | OSLO |
| ATOM ELEKTRO AS | 893022392 | OSLO |
| ATP ARKITEKTER AS | 897489422 | OSLO |
| AUSTIGARD ARKITEKTUR AS | 911982153 | OSLO |
| AUTOMATIKK MONTASJE AS | 933144178 | OSLO |
| AXA BYGGSNEKKER AS | 925738417 | OSLO |
| BA ARKITEKTER AS | 940203899 | OSLO |
| BAD & BYGG VVS AS | 919366753 | OSLO |
| BADEMILJØ EIENDOM AS | 980413160 | OSLO |
| BAD & KJØKKEN RENOVERING AS | 929126386 | OSLO |
| BAD OG PROSJEKT AS | 815354982 | OSLO |
| BAD & RØRSERVICE AS | 927810530 | OSLO |
| BAGSTEVOLD VVS AS | 989188666 | OSLO |
| BALANSE HUS AS | 916989601 | OSLO |
| BALCO AB | 984997353 | OSLO |
| BALKONGTEAM AS | 979546483 | OSLO |
| BANESERVICE AS | 986392912 | OSLO |
| BAR BAKKE LANDSKAPSARKITEKTER AS | 990379386 | OSLO |
| BARENTSBYGG AS | 920610641 | OSLO |
| B CONSULT AS | 948892316 | OSLO |
| BE-AR AS | 929945298 | OSLO |
| BECKMANN BYGG AS | 990881308 | OSLO |
| BE ELEKTRO AS | 880859862 | OSLO |
| BENDLER GRUPPEN 1 AS | 832005452 | OSLO |
| BERG OG SANDBOE ELEKTRO AS | 946667862 | OSLO |
| BERGSENG ARKITEKTUR | 989499971 | OSLO |
| BESSEGGEN ARKITEKTER AS | 925252492 | OSLO |
| BETA VVS AS | 924454946 | OSLO |
| BETO BYGG AS | 968403249 | OSLO |
| BETONGARBEID AS | 812016482 | OSLO |
| BETONGPARK AS | 999269648 | OSLO |
| BILLKVAM & FAGERHAUG AS | 933692817 | OSLO |
| BIOS ARKITEKTER AS | 995193671 | OSLO |
| BISLET RØR AS | 974400413 | OSLO |
| BJERKE RØR AS | 918082476 | OSLO |
| BJERKE VENTILASJON AS | 986887768 | OSLO |
| BJERKLIND BYGG AS | 942528531 | OSLO |
| BJØLSEN RØRSERVICE AS | 929363442 | OSLO |
| BJØRBEKK & LINDHEIM AS | 848285722 | OSLO |
| BJØRG THORVIK HELGEN LANDSKAPSARKITEKT MNLA | 985322864 | OSLO |
| BJØRN HAGA MASKIN OG TRANSPORT AS | 992504560 | OSLO |
| BJØRN JØRGENSEN AS | 979778910 | OSLO |
| BJØRN SIMONSEN & SØNN AS | 837521432 | OSLO |
| BJØRNS RØRLEGGERSERVICE AS | 979442009 | OSLO |
| BK-ANLEGG AS | 913186885 | OSLO |