Cost to Second Story Addition in Chicago, IL (2026)
If you’re budgeting a second story addition in Chicago, most projects run $117,106-$351,318, 17% above the $175,000 national average. What moves that number most is usually one thing: Foundation and First-Floor Capacity. On its own it can swing the cost by $10,000 - $60,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Commission a structural engineering report ($500-$1,500) before finalizing your budget. Foundation issues discovered mid-project are far more expensive than catching them upfront.
$117,106-$351,318 in Chicago
17% above the national average · 1.17x cost multiplier
In Chicago, a second story addition runs $117,106 to $351,318 on average - about 17% above what homeowners pay nationwide. The Midwest market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.
Cost Breakdown in Chicago
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per sq ft | $176 | $293 | $468 |
| Materials | $43,600 | $81,750 | $152,600 |
| Labor | $63,328 | $107,658 | $177,319 |
| Permits | $5,450 | $8,720 | $13,080 |
| Design | $7,630 | $13,080 | $27,250 |
| Total | $120,008+18% vs. national avg | $211,208+17% vs. national avg | $370,249+17% vs. national avg |
Budget
Full second story over a 1,000 sq ft footprint with standard materials, vinyl siding, builder-grade windows, and basic finishes. Minimal interior customization.
Mid-Range
1,200 sq ft second story with mid-grade finishes, fiber cement siding, energy-efficient windows, 3 bedrooms, 2 bathrooms, and dedicated HVAC system.
Premium
1,500+ sq ft second floor with custom architectural design, premium finishes, vaulted ceilings, master suite with luxury bath, and full structural engineering.
Material Options
Material prices below are national averages; availability in Chicago may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| Wood Frame with Vinyl Siding | $150-$200 per sq ft | Budget-conscious projects on homes that already have vinyl sidingMost affordable construction method, fast framing, widely available contractors |
| Wood Frame with Fiber Cement Siding | $200-$280 per sq ft | Mid-range additions where exterior quality and longevity matterDurable, paintable, low maintenance, matches most existing home styles, fire-resistant |
| Wood Frame with Brick Veneer | $250-$350 per sq ft | Brick ranch homes where matching the exterior is critical for resaleExcellent curb appeal, matches brick first floors seamlessly, very durable |
| Structural Insulated Panels (SIPs) | $220-$320 per sq ft | Energy-conscious homeowners in climate extremes who want long-term utility savingsSuperior insulation, faster framing, energy-efficient, airtight construction |
| Modular / Prefab Second Story | $130-$220 per sq ft | Straightforward rectangular footprints where speed and cost control are prioritiesFactory-built sections reduce on-site time, weather exposure, and labor costs |
Other Projects in Chicago
Chicago Estimate
Typical Range
$117,106-$351,318
vs. National Average
17% above national
Cost Multiplier
1.17x
Cost Per sq ft
$176-$468
This 1.17x estimate prices Chicago labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.
See national average costs →