Convert PDF House Plan into editable Autocad DWG File

I have architectural house plans for a new 2 storey house in PDF format. I also have entire topographical survery of existing site plot as a DWG file (see attachments). I require the house plans to be imported into autocad and converted into an editable DWG file. I will also require some modifications to the current house plans. These modifications will be relatively minor. For example, change in room position or roof structure, change in position of swimming pool on site plan. I will require new DWG file containing house alone and one with house incorporated into plot site plan.