The answer to 'how much does flashing cost' is that the cost of flashing can vary widely depending on several factors. Flashing is a critical component used to seal and waterproof the joints and gaps around chimneys, vents, skylights, and other roof penetrations. The material, size, and complexity of the flashing installation will all impact the final cost.
Generally, basic metal flashing materials like aluminum or galvanized steel can range from $5 to $15 per linear foot. More premium options like copper or stainless steel can cost $15 to $30 per linear foot. The labor to properly install flashing is also a significant factor, with professional roofers typically charging $50 to $150 per hour. The total cost for a flashing project can range from a few hundred dollars for a simple job up to $1,000 or more for complex roof penetrations or custom flashing work.