aerial roof measurement

How To Calculate The Cost Of A Roof Replacement

Getting Rid of the Previous Roof

Expect to pay at least $1,000-$2,000 for the contractor to remove and haul away the previous roof from your home. Obviously, this cost will increase with the size of your roof and the difficulty of workers to remove the old shingles—the longer it takes, the more man-hours will be required.


First, some basic roofing terminology: A 10-by-10-foot section of roof is commonly referred to as a square. That equals a 100 square feet, so a 2,500-square foot roof is 25 squares. Here are some basic estimations on the cost of one square of shingles (actual costs will vary, of course, depending on shingle quality, materials used, and brand):

  • Asphalt shingles: $80-$120
  • Cedar shake shingles: $600-$900
  • Slate tile: $300-$500
  • Metal roofs: $200-$1500

Other Roofing Materials

From the nails used to the underlayments that shingles will reside upon to the flashing that secures joints, seams, and edges, the materials to hold your roof together will be part of your investment. The quality of these materials can vary—generally, the more you spend, the better the roof—but plan on about $50-$100 per square.

How are Roofing Estimates Determined?

When experienced roofing contractors arrive to provide a free estimate, they consider several factors. This is how they go about giving you an accurate cost analysis.

  • Roof Measurement

Roof measurements are taken digitally. Roofing contractors use technology like satellite imagery or drones. Their calculations include such factors as the slope, roofline peaks, and the overall complexity of your roof.

  • Roof Inspection

In a thorough roof inspection, roofing contractors assess the condition of your roof. This helps them determine the scope of the project.

  • Roofing Materials

Experienced roofing contractors will explain the advantages of various materials and make recommendations concerning the best roofing system materials for your home or business. They will factor in such things as shingles, ventilation, roof accessories, and warranty.

  • Calculating Costs

Once the roofing contractor has obtained this information, the company is prepared to provide an accurate estimate to the question: How Much Does the Average Roof Replacement Cost?

The roof replacement specialists will factor in: labor, materials, warranty, and permits, the cost of removing old materials, and cleaning up.

For a basic project in zip code 47474 with 125 square feet, the cost to Install a Asphalt Shingle Roof starts at $3.75 – $4.92 per square foot*. Actual costs will depend on job size, conditions, and options.

To estimate costs for your project:

1. Set Project Zip Code Enter the Zip Code for the location where labor is hired and materials purchased.

2. Specify Project Size and Options Enter the number of “square feet” required for the project.

3. Re-calculate Click the “Update” button.


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