Per square in roofing means 100 square feet of roof space. Roofers use this term to measure how much material and labor you need for your roof. When a roofer gives you a price, they often say it as a cost per square instead of per square foot. This makes the math easier and faster on job sites.
Why Do Roofers Use Squares?
One square equals 100 square feet. So if your roof is 2,000 square feet, you have 20 squares. The average U.S. roof size is 2,647 square feet or about 26.47 squares, according to the National Association of Home Builders.
Using squares is faster than saying “per square foot” all day long. A roofer can quote you a price like “$450 per square” and you know exactly what that means in the industry.
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How to Calculate Roof Squares
To find your roof squares, measure the total roof area in square feet. Then divide by 100.
For example, a 1,700 square foot roof is 17 squares. According to RubyHome, roof installation costs range from $4 to $40 per square foot, which equals $400 to $4,000 per square. For a 1,700 square foot roof, total costs would be $6,800 to $68,000 depending on materials and labor.
What Does Per Square Cost Include?
The per square price covers material and labor to install one square (100 sq. ft.) of roofing. Different materials cost different amounts per square.
| Material Type | Cost per Square Foot | Cost per Square (100 sq. ft.) |
|---|---|---|
| Basic asphalt shingles | $4.25 to $4.95 | $425 to $495 |
| Architectural asphalt shingles | $4.50 to $8.25 | $450 to $825 |
| Metal roofing | $5.50 to $17.05 | $550 to $1,705 |
| Slate tiles | $12.00 to $22.00 | $1,200 to $2,200 |
Average Roof Replacement Cost by Squares
The average roof replacement cost in the U.S. is $9,526, according to RubyHome. This ranges from $5,868 to $13,217 for most homes. Asphalt roofing dominates the market at about 80% of projects, making it the most common choice for homeowners.
A typical single-family home has a roof of 15 to 30 squares. If you paid $500 per square for asphalt shingles, a 20 square roof would cost around $10,000. Architectural asphalt shingles, which last 30 years versus 20 years for basic shingles, might cost $650 per square, bringing that same 20 square roof to $13,000.
According to industry data, roof replacement typically lasts between 25 and 50 years. Metal roofs can last 40 to 80 years, so the upfront cost per square is higher but spreads over decades.
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Talk with a local professional roofer to review your options and get a detailed estimate for your project.