Metal awnings can range from $1,800–$27,400, including materials and installation costs.  Here are the costs per square foot that you can expect from different awning materials:
Steel: $10–$35
Copper: $90–$120
Aluminum: $5–$15
Costs can also range depending on the style you choose, such as traditional, open traditional, canopy, or bullnose.  You can also consider other styles of patio roofs, like gazebos, pergolas, or gabled roofs.