Most of the off the shelf CAD system will do what you want to do. The difference is in the bells-and-whistles, and easy of use. Look for export capability to an AutoCAD format (either DXF or DWG). This will insure that anything you might do can be userd by someone else.
Check with your local building code enforcement officer, though, some states require that a "Professional" (either a P. E. or License Architect) sign off on plans before you can get a permit to build. This is often based on % of change or total dollar value of the renovation.