Attic Conversion Cost Calculator
Conversion cost from dormers, insulation, and HVAC.
Inputs
%
Results
Total conversion cost ($)
$71,040
Cost per usable sq ft ($)$203
Usable sq ft350
Dormer cost ($)$10,000
Floor work ($)$5,500
Insulation ($)$3,000
Staircase ($)$6,000
Materials subtotal ($)$42,602
Labor cost ($)$19,171
Contingency ($)$9,266
How to Use This Calculator
- Enter your attic's footprint in square feet and the peak ceiling height in feet.
- Select the dormer type (none, shed, gable, or hip) -- dormers are the biggest cost driver.
- Indicate whether a new staircase is needed and your desired finish level (basic, mid, or high-end).
- Toggle optional items like floor reinforcement and bathroom addition, and set your contingency percentage.
- Review total cost, cost per usable square foot, and individual line items (dormers, insulation, staircase).
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