Second Story Addition in St. Louis, MO — Costs $80,747 to $504,667
What does second story addition cost in St. Louis? Average $201,867, ranging $80,747–$504,667. Labor runs $31.46/hr locally — 1% above the national average. Free breakdown with material + labor split.
St. Louis, MO Market
+1% vs nationalLabor Rate
$31.46/hr
Material Index
97
Avg Permit Cost
$1,491
Median Home Price
$238,249
St. Louis is a mid-sized city in Missouri with a healthy pool of local contractors. Homeowners generally have several options to compare for a second story addition, which helps keep pricing competitive. Costs in St. Louis run slightly above the national average, though the gap is modest enough that smart material choices and timing can close it. At a median home price of $238,249, homeowners in St. Louis should weigh the project cost (84.7% of home value) carefully against expected returns to avoid over-improving for the local market.
Low Estimate
$80,747
National: $80,000
Mid-Range
$201,867
National: $200,000
High End
$504,667
National: $500,000
Per Sq Ft
$303
National: $300
Second Story Addition Cost Calculator for St. Louis
Adjusted for St. Louis's labor rate ($31.46/hr) and material costs (index 97).
Mid-grade materials, good quality fixtures, standard options.
Estimated Total in St. Louis
$201,867
Based on 200 sq ft at mid quality, adjusted for St. Louis market rates.
Local Cost Breakdown
At St. Louis's average rate of $31.46/hr (5% above national avg)
Material cost index 97 (3% below national baseline of 100)
Second Story Addition vs. Home Value in St. Louis
| Metric | St. Louis | National Avg |
|---|---|---|
| Second Story Addition (Mid-Range) | $201,867 | $200,000 |
| Median Home Price | $238,249 | $350,000 |
| Project as % of Home Value | 84.7% | 57.1% |
| Estimated ROI | 60% | 60% |
| Median Household Income | $50,044 | $75,000 |
What Affects the Price in St. Louis
- 1Local labor rates ($31.46/hr in St. Louis)
- 2Material cost index (97 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 St. Louis, MO
Accessory Dwelling Unit (ADU) Construction
$151,400
Room Addition
$90,840
Swimming Pool Installation
$65,095
Garage Addition
$55,513
Home Addition
$80,432
Inground Swimming Pool
$64,840
Attic Conversion
$55,730
Swimming Pool Construction
$50,663
Second Story Addition in Other Missouri Cities
Planning a Second Story Addition in St. Louis
Building permits are typically required for a second story addition in St. Louis. The average permit fee in this area is $1,491, 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 St. Louis, skilled contractors charge an average of $31.46/hr, and the specialized nature of this work means cutting corners on labor can lead to costly rework.
For the median St. Louis household earning $50,044/year, this project at $201,867 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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