Illinois · 2026 cost guide
How much does a deck cost in Illinois?
In Illinois, a deck costs about $5,200–$20,500 in 2026 for a 320 sq ft deck, from pressure-treated to composite — roughly $16.2–$64.8 per square foot. That’s about 8% above the U.S. average.
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Illinois cost breakdown
| Typical total (a 320 sq ft deck) | $5,200–$20,500 |
| Per square foot | $16.2–$64.8 |
| Metro areas (Chicago, Aurora, and Naperville) | up to ~$22,000 |
| Versus U.S. average | about 8% above average |
What’s different about Illinois
Illinois pairs harsh freeze-thaw winters with Chicago's strict permitting and unionized labor, raising costs in the metro relative to downstate.
- Footings have to reach below the frost line, so deeper excavation adds cost.
- Permit fees and skilled-trade labor rates here run well above the national average — usually the single biggest cost driver.
Expect quotes toward the higher end in Illinois’s larger metros — Chicago, Aurora, and Naperville — where labor and permit costs run above the state average, and lower in rural areas.
How the cost is built
Deck cost depends on size, decking material (pressure-treated pine is cheapest; composite and PVC are mid-range; tropical hardwood is premium), and structural extras like railings, stairs, and elevated footings. Permits and ledger flashing add cost on attached decks.
Resale value
A wood deck recoups about 50–83% of its cost at resale — more than a composite deck — according to the annual Remodeling Cost vs. Value report.
Frequently asked questions
How much does a deck cost in Illinois?
In Illinois, a deck costs about $5,200 to $20,500 in 2026 for a 320 sq ft deck, from pressure-treated to composite — roughly 16.2–64.8 per square foot. That's about 8% above the national average, reflecting local labor and material costs.
What affects the cost of a deck in Illinois?
Illinois pairs harsh freeze-thaw winters with Chicago's strict permitting and unionized labor, raising costs in the metro relative to downstate. Footings have to reach below the frost line, so deeper excavation adds cost.
How can I get an accurate deck building estimate for my home?
Use the free Deck Cost Calculator to plug in your real measurements and materials, then collect two or three local quotes to compare. Within Illinois, prices run higher in metros like Chicago, Aurora, and Naperville and lower in rural areas.
Deck building cost by city in Illinois
Deck building cost in nearby states
Keep planning
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Open calculator →Sources & method
The Illinois figure is the national installed-cost range scaled by a Illinois regional cost index (its construction costs run about 8% above the U.S. average), then adjusted for the local climate and code factors above. It’s a 2026 planning estimate, not a quote — get local bids before budgeting.
- Smart Cost Hub methodology — how our cost ranges and indices are built
- U.S. Bureau of Labor Statistics — Producer Price Index (construction materials)
- Deck Quotes Near Me — local Illinois contractor quote data