How much does a deck cost in Illinois?
Wood or composite deck with railings and stairs. Using Illinois material pricing, a typical DIY deck runs about $3,400 in materials — 6% above the national average. These are estimates only, built from our live calculator's default project size — plug in your exact dimensions for a precise shopping list.
Estimates only — not a quote.
Illinois cost breakdown
| Estimate | Low | Typical | High |
|---|---|---|---|
| Illinois (DIY materials) | $2,890 | $3,400 | $4,590 |
| National average | $2,727 | $3,208 | $4,331 |
Illinois material prices run about 6% above the national average based on our regional pricing index. Based on a common-size deck — enter your own dimensions in the calculator for an exact number.
DIY materials estimate: $3,400. Hiring a contractor in Illinois (materials + labor at ~$66/hr) estimates to $8,078–$10,832, roughly 75 labor hours. Estimated DIY savings: $5,780 (63%).
Get your exact Illinois price
Enter your dimensions for a precise materials list and cost — an estimate tailored to your build, not a generic average.
Frequently asked questions
Materials alone typically run $2,890–$4,590 in Illinois for a common-size project, based on current regional material pricing. This is an estimate, not a quote — use our free calculator for numbers matched to your exact dimensions.
DIY materials run about $3,400 versus an estimated contractor range of $8,078–$10,832 (materials plus labor at the regional rate of $66/hr). That's a potential estimated savings of $5,780 (63%) by doing it yourself.
Permit thresholds vary by project type and city. Check our Illinois permit lookup and build guide for the state-level rules before you start.
See our deck materials and cut list page for the canonical parts list, then run the calculator with your dimensions for an exact quantity and cost breakdown.