Sounds about right. Thas a large home. heck, my home is half that size and i was quoted 17K (roof tiles included) Call two other companies and see what their bids are

Did you get several bids? That might be a good idea before going ahead with this company.

Please get more bids. After going through a tornado in Florida last January that took down my fence, I got quotes that ranged from $800 to $5200. I had 95% of the fence pieces and only needed to replace 12 posts. Some contractors take advantage after a natural disaster because they know there's insurance money involved.

Are they ripping off the old roof? How high is the roof? What type of shingles? All of this can and will effect the install price.

Not enough information. Its within reasonable distance. Your ''rule of thumb'' is incorrect. Labor is more like 2/3 of the project, not half.