4 foot wide gable dormer, labor and material for one, is $2200. Two would be double that.
7 foot wide gable dormer would be $4400 labor and material for one.
My manual states under level of difficulty that this does require the skills of a licensed carpenter. Look for referrals and possibly other dormer jobs.
This does not include roofing the entire roof this does include the flashing and roofing the dormer and blending into the existing roof.
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