Building a house in Illinois costs about $190 per sq ft in 2026, or about $380,000 for a 2,000 sq ft home before land. That makes Illinois the 47th cheapest of the 50 states and 14% above the US median of $166 per sq ft.
How much does it cost to build a house in Illinois by size?
| House size | Basic finishes | Standard finishes | Premium finishes |
|---|---|---|---|
| 1,200 sq ft | $187,000 | $228,000 | $307,800 |
| 1,500 sq ft | $233,700 | $285,000 | $384,800 |
| 2,000 sq ft | $311,600 | $380,000 | $513,000 |
| 2,500 sq ft | $389,500 | $475,000 | $641,300 |
| 3,000 sq ft | $467,400 | $570,000 | $769,500 |
Standard finishes use the Illinois rate of $190 per sq ft; basic and premium use our calculator’s finish factors (0.82 and 1.35). Figures exclude land, and local costs in Illinois can be well above or below the state average.
Where does the money go?
For a 2,000 sq ft home in Illinois at about $380,000, NAHB’s 2024 national cost shares work out roughly as follows:
| Stage | Share | Illinois 2,000 sq ft home |
|---|---|---|
| Site work | 7.6% | $28,900 |
| Foundation | 10.5% | $39,900 |
| Framing | 16.6% | $63,100 |
| Exterior finishes | 13.4% | $50,900 |
| Plumbing, electrical and HVAC | 19.2% | $73,000 |
| Interior finishes | 24.1% | $91,600 |
| Final steps (driveway, landscaping) | 6.5% | $24,700 |
| Other | 2.1% | $8,000 |
Building considerations in Illinois
Illinois costs vary widely between the Chicago area, where land, permits and labor are expensive, and downstate counties, where building is much cheaper.
How does Illinois compare with neighboring states?
| State | 2,000 sq ft home | Per sq ft |
|---|---|---|
| Kentucky | $308,000 | $154 |
| Iowa | $324,000 | $162 |
| Indiana | $329,000 | $164.50 |
| Wisconsin | $335,000 | $167.50 |
| Missouri | $341,000 | $170.50 |
| Illinois | $380,000 | $190 |
See all 50 states in the state cost comparison.
How much does land cost in Illinois?
USDA put the average value of farm real estate in Illinois at $8,930 per acre in 2025 (US average $4,350). Small rural parcels and lots near towns usually sell for much more per acre than farmland. Illinois is in the East North Central census division; NAHB did not publish a median lot value for it in its 2025 release, but the national median was $59,000. See land cost for site costs such as wells, septic and driveways.
Frequently asked questions
How much does a 1,500 sq ft house cost to build in Illinois?
About $285,000 with standard finishes, before land.
How much does a 3,000 sq ft house cost to build in Illinois?
About $570,000 with standard finishes, or $769,500 with premium finishes.
Is Illinois a cheap state to build a house in?
No. Illinois is among the 15 most expensive states, with costs 14% above the US median.
How do I finance building a house in Illinois?
Most people use a construction loan that converts to a mortgage when the home is finished. FHA, VA and USDA construction loans are available nationwide through approved lenders.
Sources
- Autodesk: How much does it cost to build a house in 2026? (state totals for a 2,000 sq ft home, based on Today’s Homeowner data; the $166/sq ft US median used on this site)
- NAHB: Cost of Constructing a Home in 2024 (stage cost shares)
- USDA NASS: Land Values 2025 Summary (farm real estate value per acre by state, August 2025)
- NAHB: Lot values slip for the first time since 2019 (July 2026)