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To install a 50-foot long ridge vent, a roofing contractor will charge $409, which includes the labor and material. If you're a handy homeowner who has experience working on roofing projects, you can buy the ridge vent material for $125 and install it yourself, saving 69 percent, a nice reward for your work.
usually expect to pay an extra $ 45 $ 80 for vent installation on sloped roof and $ 35 $ 60 on a flat roof cost to install skylight on a sloped roof will vary from $ 290 to $ 950 depending on skylight size and a roof pitch on a flat roof the price will be $ 250 $ 600 each