 | ATAM AS | 929578171 | 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 |
| ATT ARKITEKTUR AS | 933210596 | OSLO |
| AUTOMATIKK MONTASJE AS | 933144178 | OSLO |
| AVSHOP AS | 988897833 | OSLO |
| AXA BYGGSNEKKER AS | 925738417 | OSLO |
| B2 ELEKTRO AS | 924386525 | OSLO |
| BAD & BYGG VVS AS | 919366753 | 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 |
| B CONSULT AS | 948892316 | OSLO |
| BE-AR AS | 929945298 | OSLO |
| BECKMANN BYGG AS | 990881308 | OSLO |
| BE ELEKTRO AS | 880859862 | 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 |
| 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 TAKST OG EIENDOMS SERVICE AS | 897404672 | OSLO |
| BLAKSTAD HAFFNER AS | 913211529 | OSLO |
| BLIKKENSLAGERMESTEREN ENTREPRENØR AS | 995455919 | OSLO |
| BLIKKENSLAGERMESTRENE HENRY HANSEN & SØNN AS | 912360997 | OSLO |
| BLOKK ARKITEKTER AS | 994293745 | OSLO |
| BMA HEISTEKNISK RÅDGIVNING AS | 974411709 | OSLO |
| BNK CONSULT AS | 930160938 | OSLO |
| BOGL NORGE AS | 924678380 | OSLO |