Approx 40'x40' - currently corrugated metal/tin would need to remove and replace with waterproofed solution (new plywood and metal sheeting or shingles etc).
What is rough estimate?
That might be tricky to get a standardized pricing. I'd say if you were to install a roll-formed steel roof, replacing existing, you'd be at or around $6-$8 per square foot. A steeper roof pitch, accessibility and location are things that can increase the price. Of course, the condition of the existing struture and roof deck are factors as well.
Hopefully this is somewhat helpful!
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