The answer to 'how much does underlayment cost in my area' is that the cost of roofing underlayment can vary significantly depending on your location, the type of underlayment you choose, and the size of your roof. Typically, you can expect to pay anywhere from $0.50 to $2.00 per square foot for basic asphalt-based underlayment, with more premium options like synthetic underlayment costing $1.00 to $3.00 per square foot.
The cost of underlayment is influenced by factors like material quality, brand, and installation complexity. It's important to get local quotes from roofing contractors to understand the specific pricing in your area. They can also advise on the best underlayment type for your roof and provide a detailed estimate for the full project.