The answer to 'underlayment installation cost in my area' is that the cost can vary widely depending on several factors, but typically ranges from $1 to $5 per square foot. The primary factors that influence the cost of underlayment installation include the type of underlayment material, the size and complexity of the roof, labor rates in your local area, and whether the installation is part of a larger roofing project or done as a standalone service.
It's important to get quotes from local roofing contractors to get an accurate estimate for your specific project, as prices can fluctuate based on the unique characteristics of your home and the local market. Many roofers will provide a free on-site assessment to evaluate your needs and provide a detailed, customized cost estimate.