Fiberglass Insulation Cost Per Square Foot
The average cost is about $1.5/sqft. Use the calculator below to estimate your overall project budget.
How to Budget for Fiberglass Insulation
When planning a project involving Fiberglass, 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 $1.5 average cost to get your baseline material budget.
The trend badge above tracks the BLS Producer Price Index for ppi industry data for mineral wool manufacturing — a real, published cost index, shown as context for how this material category is trending. It is not the source of the $1.5/sqft figure above, which is our own compiled estimate (see methodology).
Frequently asked questions
In 2026, the average cost for Fiberglass Insulation is approximately $1.5 per square foot. Prices typically range from $1 to $2.5 depending on quality and region.
At the average price of $1.5/sqft, a 500 square foot project would cost roughly $750 for materials alone.
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