Span is usually the biggest single factor, because the City requires an engineered, sealed design for anything over 24 feet and that is a real cost rather than a formality.
After that it is the attachment and the ground. A cover that can reach framing behind the veneer is simpler than one that has to stand on its own posts, and footings on the Vertisol clay around San Angelo are designed rather than assumed.
The permit is the smallest line on most of these jobs and the one people worry about most.
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