Build vs Buy in Illinois
25-year total cost comparison, construction data, and build feasibility for Illinois (IL).
Building in Illinois: Overview
Illinois' punishing property taxes — second highest in the nation — weigh heavily on long-term ownership costs whether you build or buy. However, new builds in the far Chicago suburbs and downstate markets offer strong value: modern energy efficiency dramatically reduces utility costs, and builder incentives in competitive markets like Plainfield and Joliet can exceed $14,000. Outside Cook County, property tax rates are more manageable, and construction costs are well below national averages.
Illinois Build vs Buy Data
25-Year Cost Comparison — Illinois
Pre-filled with Illinois averages. Adjust to match your scenario.
Assumes: resale maintenance escalates at 3% annually from year 1; new-build maintenance is $0 during warranty, then 0.5% of value escalating at 2%; insurance escalates at 8% annually; resale insurance is 15% higher than new-build rates. For a full analysis, use the 25-Year Total Cost Calculator.
The Resale Trap Ranks All 50 States
Illinois is one of 50 states ranked by Build Feasibility Score in The Resale Trap. The book models every cost — maintenance, insurance, property tax, capital expenditure, and opportunity cost — across a 25-year ownership horizon with sourced institutional data.
Get the Book on AmazonRun Your Full Comparison
The mini calculator above uses Illinois averages. For a complete 25-year model with mortgage amortization, opportunity cost, and detailed year-by-year breakdowns, use the full calculator.
Full 25-Year Cost Calculator →Illinois Build vs Buy FAQ
Based on 25-year total cost of ownership modeling, building new in Illinois costs significantly less than buying a comparable resale. The average new build costs $235,000 vs a median resale price of $260,000. Factor in lower maintenance (new builds carry 4 years structural warranty), insurance savings (new construction qualifies for lower rates), and avoided capital expenditures, and the gap widens substantially over time.
The average cost to build a new home in Illinois is approximately $155 per square foot, or $235,000 for a typical home. This includes construction costs and standard finishes but excludes land. Permit timelines average 6-12 weeks in Illinois. Production builders in Plainfield, Joliet suburbs, Bloomington-Normal often offer builder incentives averaging $14,000.
The best cities for new construction in Illinois include Plainfield, Joliet suburbs, Bloomington-Normal. These markets offer competitive construction costs, active builder communities, and reasonable permitting timelines. Illinois has a Build Feasibility Score of 5.8/10, ranking it moderate for new home construction nationwide.