Dormer Addition Cost
Add dormers to increase attic space, natural light, and headroom in upper-level rooms.
Low Estimate
$15,000
Mid-Range
$35,000
High End
$75,000
Avg ROI
65%
Interactive Cost Estimator
Mid-grade materials, good quality fixtures, standard options.
Estimated Total Cost
$33,600
Based on 200 sq ft at mid quality. Actual costs vary by location and contractor.
Cost Breakdown
Approx. $19,250 at mid-range pricing
Approx. $15,750 at mid-range pricing
Labor-heavy projects (with high labor costs) benefit most from getting multiple contractor bids. You can save on materials-heavy projects by sourcing materials yourself at contractor pricing.
What Affects the Price
- 1Dormer type
- 2Size
- 3Structural changes
- 4Roofing
- 5Windows
Popular Upgrades
- Shed dormer
- Gable dormer
- Bathroom in dormer
Discuss upgrades with your contractor before finalizing the quote. Some upgrades are cheaper to include during initial construction than to add later.
DIY vs. Hire a Pro
Professional installation strongly recommended.
DIY Advantages
- • Save 55% on labor costs ($19,250 at mid-range)
- • Control over timeline and material selection
- • Satisfaction of completing the project yourself
- • Flexibility to work in phases
Pro Advantages
- • Guaranteed workmanship and professional finish
- • Proper permits and code compliance
- • Access to trade pricing on materials
- • Required for safety and code compliance
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