Approval utleidel

We bought a house built in 1957 that has recently undergone renovations. It features an 'utleiedel' in the basement, which has been partially renovated but is not yet approved for rental. In the current state, the rental unit already has a ceiling height exceeding 2 meters and comes with a parking spot. We are seeking a company that can assess the necessary work required to obtain approval for the rental unit, perform the required work, and ensure that the unit is properly registered as an approved rental unit. The estimated work required for approval includes the installation of a new window in the bedroom, which will require work on the existing concrete wall. Additionally, a new sound-proof ceiling is required to meet the necessary standards for an approved rental unit.