I am pretty confident about my pricing for wood frame construction, but haven't done steel design for a while, and not in the US market.
A potential client wants to cover an existing 30x80 ft concrete slab on grade with a structure similar to a car port, with a height of 15 ft. The structure itself is simple, i.e. metal sheet roof, purlins, girders, columns, and pad footings.
Is there a guideline for design fees, like a $ amount per sqft, % of construction cost or something similar?

Is detailing typically included in the design fees or is this routinely done by the manufacturer (and contracted separately)

Thanks for your input

Roland