Size | Square Footage | Slope
The size, square footage, and slope of your roof are the primary determiners for replacement costs. The greater each of those numbers, the higher the estimate.
Waste & Materials
Be aware that your estimate will include a slight over-estimation of the total roof square footage to account for shingle overlap and cut-offs at the gables and flashings.
Roof Design & Shape
If you have a character home with an unusual roofline, you’re likely going to end up paying more.
Roofing contractor costs vary from region to region, so get an idea of what is average for your location, and then choose a company based on reputation and skill.
Permits & Inspections
Some cities or towns require permits before work starts and an inspection when it ends; they will both come with fees.
All those old shingles have to go somewhere, and your contractor must dispose of them properly at a waste facility.
Most shingles and roofing materials come with standard warranties, but your contractor may suggest an extended warranty on the products.
If your new residential roof lacks the necessary ventilation, your roofer may suggest adding it to extend the life of your home.