Cost to Build a 1,500 sq ft Home in Illinois (2026)
A 1,500 sq ft two-story home in Illinois costs about $300,048 to build at mid-range quality — $200/sq ft, land excluded. The median new home in the Midwest is 1,969 sq ft, so this build is 24% smaller than the regional median.
Is 1,500 sq ft a normal size for Illinois?
24% of new homes completed in the Midwest fall in the 1,400–1,799 sq ft range that a 1,500 sq ft build sits in, against 29% for the most common bracket (1,800–2,399 sq ft).
The Census Bureau measures every new single-family home completed in the country. In the Midwest — the region Illinois sits in — the median came in at 1,969 sq ft and the average at 2,240 sq ft. A 1,500 sq ft build is therefore 24% smaller than the regional median.
Estimated Build Cost in Illinois
Range: $264,042 – $336,054
Configure Your Build
Upgraded finishes, quality materials
Mid-Range Finish Includes
- • Quartz countertops
- • Hardwood floors
- • Semi-custom cabinets
- • Upgraded fixtures
Line-Item Estimate
* Excludes land cost, which varies widely by location. Add $20,000–$200,000+ depending on your area.
Mortgage Estimate
Income Rule of Thumb
To keep housing costs under 28% of gross income, you'd need to earn at least $66,043/year to afford this 1,500 sq ft home.
Rate: 6.65% — Freddie Mac Primary Mortgage Market Survey, Aug 20, 2026. Does not include property taxes, insurance, or HOA fees.
What new homes in the Midwest are actually built with
Specification drives cost as much as square footage does. These are the choices most builders in Illinois's Census region actually make, from the U.S. Census Bureau Survey of Construction (2025).
The Census Bureau also publishes what these homes cost to build: a median contract price of $194.09/sq ft in the Midwest, excluding land — the same basis our estimates use. Our mid-range figure for Illinois is $200/sq ft.
What drives the cost in Illinois
Local labour and land
Wages: BLS Occupational Employment and Wage Statistics, May 2025. Land share: FHFA Working Paper 19-01.
Total project, not just construction
Rate: Freddie Mac PMMS 30-year fixed, 2026-08-20. Principal and interest only — taxes, insurance and closing costs are extra. The lot figure is derived from Illinois's statewide land share, not a quote for a specific parcel. Median lot size: Census Survey of Construction, 2025.
Building conditions in Illinois
- →5,802 heating and 985 cooling degree days a year, the 16th-highest combined load of the 48 contiguous states. At 1,500 sq ft that difference shows up directly in HVAC sizing and insulation spec. (NOAA, 2016-2025 average)
- →10,821 single-family permits were issued statewide in 2025 — the depth of the local builder market you are hiring from. See the 35-year history.
What a different size would cost in Illinois
Cost model: HouseBuildCalc Permit Cost Index (876,000+ building permits, 1,700+ ZIP codes), benchmarked against the U.S. Census Bureau Survey of Construction. Regional home characteristics: U.S. Census Bureau Survey of Construction 2025. Wages: BLS OEWS May 2025. Land: FHFA WP 19-01. Climate: NOAA Climate at a Glance. For planning only — get professional bids before committing to a budget. Full methodology and raw data.