Question: how much does it cost to build a roof over a patio?
Answer: The average cost for a patio roof addition using low-maintenance wood-patterned aluminum runs for about $6,000 to $10,000 for an area of 20 by 20 feet, as of 2011. A screen can be added for an additional cost of $3,000 to $4,000. Adding a wood lattice roof can range between $500 and $10,000.