Fully assembled MSS12R 1 Story addition (see images below for examples of houses with additional floors). This product ships with two screws securing the floor sections for security in transit. Installation requires that these two screws be removed. Then the story is simply bolted to the top of the existing story. The ceiling is to be replaced with its original screws and the installation is complete! Everything is in place for quick installation. Dry Nest Subfloors and Winter Door Stops are also included. All parts are USA made and as always, spare parts are readily available. Note: Adding more than one story requires the replacement of the rope lanyard with our "WCK" Winch Conversion Kit (click here)  to handle the added weight.