I've got an older garage on my property and it's got a real rough and uneven concrete floor in it. I'll try and post a pic later but it's ugly. Is it best to take it out and start over or can it be salvaged and repaired with a new surface? Anyone delt with this before?

I'm also wanting to raise the roof on it. It's got 8' high doors on it and I would like 12's with a 13 or 14' ceiling inside. I don't think it would be too hard to jack it up and extend the wall height and put her back down. If I build the walls ahead of time and get a crane in here for couple hours, throw walls up . Anyone ?

thanks!