Average Deck Building Cost in Illinois
$8,512
Low End
$5,887
Average
$8,512
High End
$11,113
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Use our free Decking calculatorHere's how deck building costs typically break down in Illinois:
Deck Building in Illinois is 6% below the national average of $9,045. This is primarily due to higher labor costs and stronger demand in Illinois.
Illinois experiences a humid continental climate with cold, snowy winters and hot, humid summers. The April-to-November construction season is compressed by freeze-thaw cycles that affect concrete and foundation work, and the entire state sits inside Tornado Alley's eastern edge with peak severe-weather risk from March through June. For deck building projects specifically, this means timing and material selection are key factors in both cost and quality.
Illinois's costs are close to the national average, reflecting a balanced supply-demand dynamic in the local construction market.
Illinois only licenses plumbing (IDPH) and roofing (IDFPR) at the state level, general contractors are licensed city by city, check Chicago, Cook County, and home-rule municipalities separately
ComEd and Ameren Illinois run large rebate programs for heat pumps, insulation, and smart thermostats for 2026, plus Illinois Shines still offers active solar incentives
Chicago has among the strictest permit and inspection processes in the country, expect 8-16 week permit timelines for significant renovations
Illinois Prevailing Wage Act affects any public or publicly-funded work, which pushes labor pricing up meaningfully even on adjacent private jobs
Most deck building projects in Illinois require a building permit, especially if structural changes are involved. Estimated permit cost: $238.
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Deck Building in Illinois typically costs between $5,887 and $11,113, with an average of $8,512 for a typical project in 2026.
No, deck building in Illinois is about 6% below the national average, making it more affordable than many other states.
Permit requirements vary by city and county in Illinois. Most deck building projects that involve structural changes require a building permit. Check our permit guide for Illinois for specific requirements.
A typical deck building project takes 2-7 days depending on the scope, weather conditions, and contractor availability in your area.
Get at least 3 quotes from licensed contractors, consider scheduling during off-peak seasons (fall/winter), ask about financing options, and make sure to compare material options as they significantly affect the total cost.
Cost estimates are based on publicly available data and industry averages for Illinois. Actual costs vary significantly based on project specifics, contractor pricing, material choices, and local market conditions. These estimates are for informational purposes only. Always get multiple quotes from licensed contractors.