Spray foam insulation is not worth the cost in a house, much less a shop. The standard metal building rolls of insulation should be adequate. My shop is always relatively comfortable and it's not even air conditioned. If it's 100+ outside, it's usually upper 80s in the shop. And when it got real cold out there, it didn't take much heat to start warming things up a bit.

Go with all metal. 2nd story storage is a great feature if you can afford it.

The only reason I would suggest wood framing is that you can put OSB on the inside and use it to hang tools on the wall. That's a great idea, but you'll probably also have to brick it if you do wood frame (or I guess you could do siding...). Either way, you're probably talking about considerably more money than a steel building. Lumber ain't cheap. Plus, it's a fire hazard if you are doing any welding in the shop.

I'm trying to decide on the best way to build a new shop. Looking at a 30x40 with a 24x24 carport off to one side.

What do you guys recommend:

1. All metal
2. Pole building
3. Hybrid Steel frame with stud framed walls.

I want to insulate it to around R-13 or higher and want to build around a 15x15 air conditioned room.

Sketch

I plan on building a 30x40 with a 10 foot carport at my lake place on Rayburn. I'm going with metal and plan to insulate it myself.