So you think it would be best to jack from the bottom of the walls rather than cut the trusses free and raise it from there? I'm on farm land so I doubt they would give me trouble for raising the garage 3 or 4 feet. No one can even see the garage unless they drive well into the land .
[img]/forums/images/icons/tongue.gif[/img] Stuff like this is almost always done from the bottom, and more often than not involves some sort of poured concrete short wall. If you do it from the bottom up, it's a do-it-yerself proposition; otherwise it becomes a job for a crane. [img]/forums/images/icons/tongue.gif[/img]
In my opinion it would be easiest and perhaps cheapest to work from the foundation up. It may allow the proper fixing of the floor. [img]/forums/images/icons/confused.gif[/img] [img]/forums/images/icons/confused.gif[/img]
The wall height is another matter. If the original was placed on a concrete block wall there is no problem. If you set on a pony wall you may need addition bracing for wind loads as there is not a continuous wall column. For the changes you wish to make this may not be a problem.
Code stuff may not become a problem till it is time to sell.