
Any plan sketches or drawings to share with us and more details ?

I would be over the moon with your existing garage. Mind=blown!
What is your slope of the floor (if any)?
Is the garage door 18' x 8' ? What quote did you get and where are you purchasing from?
The garage will be all brick, insulated and air conditioned with an 8/12 pitch roof and it works out to $50 per sq ft
Exactly 18' 3"
Sorry.Please elaborate, I don't know what you mean?