I'm in the planning stages for my shop building. My initial plans called
for 9' walls with a vaulted ceiling so I would have plenty of overhead
clearance.

Are 9' walls still enough clearance if I switch to a flat ceiling? Are
10' walls really worth all the extra lumber and heating/cooling expense?

In an ideal world, the walls would be 12 to 15 feet high, but I don't have
the budget for that.

Brian Elfert