On top of taller sidewalls --- I would also recommend putting in electrically operated SKYLIGHTS with Screens! I use them all the time in the summer to let the heat OUT... and if I'm running a car -- or welding (a lot) I open them and let the stink out.
At the time -- the building costs were doubled because of the 3 skylights -- adding the 6/12 pitch roof and using standing seam roofing - going with bigger garage doors (cost did NOT include the actual garage doors) -- one is 12 X 14 and one is 10 X 12 - and I did the extended eve so it looks like a house not a metal building and DRUM ROLL...... that all doubled the cost from 10 grand to 20!!! Thats for a 38 X 50 clear span. Here's a pic of the SPACE inside. This was prior to finish work but you get the picture.
