Second Story Addition in Naperville, IL — Costs $99,160 to $619,750
What does second story addition cost in Naperville? Average $247,900, ranging $99,160–$619,750. Labor runs $38.97/hr locally — 24% above the national average. Free breakdown with material + labor split.
Naperville, IL Market
+24% vs nationalLabor Rate
$38.97/hr
Material Index
118
Avg Permit Cost
$1,349
Median Home Price
$238,763
Naperville is a mid-sized city in Illinois with a healthy pool of local contractors. Homeowners generally have several options to compare for a second story addition, which helps keep pricing competitive. At 24% above the national average, Naperville is one of the more expensive markets for home improvement — driven primarily by above-average labor rates in the region. At a median home price of $238,763, homeowners in Naperville should weigh the project cost (103.8% of home value) carefully against expected returns to avoid over-improving for the local market.
Low Estimate
$99,160
National: $80,000
Mid-Range
$247,900
National: $200,000
High End
$619,750
National: $500,000
Per Sq Ft
$372
National: $300
Second Story Addition Cost Calculator for Naperville
Adjusted for Naperville's labor rate ($38.97/hr) and material costs (index 118).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in Naperville
$247,900
Based on 200 sq ft at mid quality, adjusted for Naperville market rates.
Local Cost Breakdown
At Naperville's average rate of $38.97/hr (30% above national avg)
Material cost index 118 (18% above national baseline of 100)
Second Story Addition vs. Home Value in Naperville
| Metric | Naperville | National Avg |
|---|---|---|
| Second Story Addition (Mid-Range) | $247,900 | $200,000 |
| Median Home Price | $238,763 | $350,000 |
| Project as % of Home Value | 103.8% | 57.1% |
| Estimated ROI | 60% | 60% |
| Median Household Income | $66,620 | $75,000 |
What Affects the Price in Naperville
- 1Local labor rates ($38.97/hr in Naperville)
- 2Material cost index (118 vs national 100)
- 3Total square footage added
- 4Structural reinforcement of first floor
- 5Staircase addition
- 6Roof removal and replacement
Popular Upgrades
- Master suite
- Additional bedrooms
- Jack-and-Jill bathroom
Other Projects in Naperville, IL
Accessory Dwelling Unit (ADU) Construction
$185,925
Room Addition
$111,555
Swimming Pool Installation
$79,794
Garage Addition
$68,173
Home Addition
$98,684
Inground Swimming Pool
$79,407
Attic Conversion
$68,500
Swimming Pool Construction
$62,273
Second Story Addition in Other Illinois Cities
Planning a Second Story Addition in Naperville
Building permits are typically required for a second story addition in Naperville. The average permit fee in this area is $1,349, though costs vary based on project scope. Permit fees in this market are above average — factor them into your total budget. Plan for 4-8 months from start to finish.
A second story addition is a complex project best left to licensed professionals. In Naperville, skilled contractors charge an average of $38.97/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
For the median Naperville household earning $66,620/year, this project at $247,900 represents a significant investment. Consider financing options or phasing the work to spread costs over time.
Second Story Addition — National Guide
See the full national cost guide with DIY tips, cost factors, and ROI analysis.
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