To make Complete leilighet of ca 70 kvm. (Kjellar) in Basement in enebolig in Gjelleråsen

Hi, We hage Basement (Kjellar) in enebolig, ca. 70 kvm, which we would like to convert into Complete leilighet with separate entrance, Kitchen, Bath, Hall, bedroom etc. We will prefer the people 1) Who can take total responsibility starting from drawings/plans approval from Kommune to final completion of leilighet 2) Also person who is showing interest should hage worked with kjeller renovation work and would be great if he can show some work done by him : ). Some nice reference from past work will be very helpful : ) 3) People who can give innovative ideas for our benefits : ) Work can be started as soon as the right partner is selected with right quality & right price : ) Please feel free to call me, i will revert back to you incase you find my phone busy : ).