Slate Roof Cost Per Square Foot
The average cost is about $18/sqft. Use the calculator below to estimate your overall project budget.
How to Budget for Slate Roof
When planning a project involving Slate, always calculate your total square footage first. Multiply the length and width of the space, and then add 10% for waste and cuts. Finally, multiply that total by the $18 average cost to get your baseline material budget.
The trend badge above tracks the BLS Producer Price Index for ppi commodity data for nonmetallic mineral products — a real, published cost index, shown as context for how this material category is trending. It is not the source of the $18/sqft figure above, which is our own compiled estimate (see methodology).
Frequently asked questions
In 2026, the average cost for Slate Roof is approximately $18 per square foot. Prices typically range from $10 to $30 depending on quality and region.
At the average price of $18/sqft, a 500 square foot project would cost roughly $9000 for materials alone.
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