Dormer Cost Calculator

Introduction: Adding a dormer to your house can provide valuable extra space and enhance its aesthetic appeal. However, determining the cost of such an addition can be complex. That’s where our Dormer Cost Calculator comes in handy. This tool will help you estimate the cost of adding a dormer to your home based on its width, depth, and roof type.

Formula: The cost of adding a dormer is calculated based on the following formula:

  • For a gable roof dormer: Cost = Width (in feet) * Depth (in feet) * $100
  • For a shed roof dormer: Cost = Width (in feet) * Depth (in feet) * $75
  • For a hip roof dormer: Cost = Width (in feet) * Depth (in feet) * $120

How to Use:

  1. Enter the width of the dormer in feet.
  2. Enter the depth of the dormer in feet.
  3. Select the roof type from the dropdown menu.
  4. Click the “Calculate” button.
  5. The estimated cost of adding a dormer will be displayed.

Example: Suppose you want to add a gable roof dormer with a width of 10 feet and a depth of 8 feet. Using the Dormer Cost Calculator, the estimated cost would be: $10 * $8 * $100 = $8,000.


  1. Q: What is a dormer? A: A dormer is a structural element that protrudes from a sloped roof, typically containing a window or windows.
  2. Q: How can I decide on the roof type for my dormer? A: The choice of roof type depends on your architectural preferences and the style of your home. Gable roofs are common for traditional aesthetics, shed roofs for modern designs, and hip roofs for a more classic look.
  3. Q: Are there any additional costs to consider when adding a dormer? A: Yes, additional costs may include permits, insulation, interior finishing, and any necessary structural modifications.
  4. Q: Is this calculator accurate for all regions and construction types? A: This calculator provides a rough estimate. Actual costs may vary based on your location, labor costs, and specific project details.
  5. Q: Can I use this calculator for commercial properties? A: This calculator is primarily designed for residential dormer cost estimation. Commercial projects may have different cost factors.

Conclusion: Our Dormer Cost Calculator simplifies the process of estimating the cost of adding a dormer to your home. Keep in mind that this is a basic estimation tool, and actual costs may vary. It’s always a good idea to consult with professionals and obtain detailed quotes before undertaking any construction project. Use this calculator as a starting point to plan your dormer addition with confidence.

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