Second Story Addition Cost
A second story addition doubles living space without expanding the home footprint. This major undertaking requires structural engineering to confirm the existing foundation and walls can support additional weight.
Low Estimate
$80,000
Mid-Range
$200,000
High End
$500,000
Avg ROI
60%
Interactive Cost Estimator
Mid-grade materials, good quality fixtures, standard options.
Estimated Total Cost
$200,000
Based on 200 sq ft at mid quality. Actual costs vary by location and contractor.
Cost Breakdown
Approx. $100,000 at mid-range pricing
Approx. $100,000 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
- 1Total square footage added
- 2Structural reinforcement of first floor
- 3Staircase addition
- 4Roof removal and replacement
- 5HVAC, plumbing, electrical extension
Popular Upgrades
- Master suite
- Additional bedrooms
- Jack-and-Jill bathroom
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 50% on labor costs ($100,000 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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