Loft space can easily be converted to a room or storage area. Putting down flooring in attic space requires paying attention to issues involving the loft that affect livability of the house. These issues include insulation, electrical wiring and plumbing in the attic floor area. Putting down a floor will take careful thought and planning, but the additional space gained will be worth the effort.
Construct an attic access that is either a hatch door or staircase. Frame the opening of the access by driving nails downward from the attic side into the ceiling of the room below. Use nails that are a minimum of 4 inches to outline the cutout. Define the opening for cutting by using a carpenter's square and chalk. Cut through sheetrock or plaster, along with floor joists, with a circular saw.
Install insulation to the full depth of the rafters before you add flooring. Don't skimp on insulation, even if you will insulate the walls and ceiling areas of the new attic room. Insulate the floor to create a dead air space, and keep heat from below from escaping to the attic, while the floor rafters are open.