Concrete Slab Cost in Illinois
Quick answer: a 4-inch concrete slab in Illinois costs about $7.50 – $14.00 per sq ft installed, 10% above the U.S. average. A 12 × 12 ft patio runs about $1,210 – $2,100, a 24 × 24 ft garage floor $4,590 – $8,080 and a 20 × 40 ft driveway $6,300 – $11,130.
Illinois concrete costs above the national average in our model, and the Chicago metro well above it, driven by labor. Chicago winters, and the salt that comes with them, are hard on driveways, so the concrete's strength and air content matter more than its finish.
Concrete Prices in Illinois by Project
| Project | Illinois installed | Per sq ft | U.S. average | DIY materials |
|---|---|---|---|---|
| 12 × 12 ft patio | $1,210 – $2,100 | $8.00 – $15.00 | $1,130 – $1,970 | $550 – $780 |
| 10 × 12 ft shed slab | $1,040 – $1,780 | $8.50 – $15.00 | $970 – $1,680 | $490 – $680 |
| 20 × 20 ft slab | $3,030 – $5,420 | $7.50 – $14.00 | $2,810 – $5,060 | $1,190 – $1,830 |
| 24 × 24 ft garage floor (5 in) | $4,590 – $8,080 | $7.50 – $14.50 | $4,250 – $7,540 | $1,940 – $2,870 |
| 20 × 40 ft driveway (5 in) | $6,300 – $11,130 | $7.50 – $14.00 | $5,820 – $10,380 | $2,620 – $3,900 |
| 30 × 40 ft shop floor (6 in) | $9,980 – $17,350 | $8.00 – $14.50 | $9,190 – $16,140 | $4,460 – $6,380 |
4-inch slabs unless shown. Installed: forms, broom finish and labor, up to vapor barrier, #4 rebar and contractor overhead and profit. DIY: concrete (ready-mix or 80-lb bags, whichever is cheaper) and forms, up to vapor barrier and rebar. Excavation, gravel base and permits are extra.
Metro Areas
Prices in the biggest metro areas differ from the state as a whole, mainly because of labor costs.
| Area | Factor | Slab per sq ft | 12 × 12 patio | 24 × 24 garage | 20 × 40 driveway |
|---|---|---|---|---|---|
| Illinois (statewide) | 1.10 | $7.50 – $14.00 | $1,210 – $2,100 | $4,590 – $8,080 | $6,300 – $11,130 |
| Chicago metro, IL | 1.22 | $8.00 – $15.00 | $1,310 – $2,250 | $5,010 – $8,730 | $6,890 – $12,040 |
Building a Slab in Illinois
| Weathering (IRC) | Severe statewide. |
|---|---|
| Concrete strength | 4,000 PSI air-entrained (5-7% air) for driveways and aprons; 3,500 PSI air-entrained minimum for patios and garage floors. 4,000 PSI ready-mix runs about $157 – $198 per yd³ here. |
| Frost depth | About 42 in in Chicago and northern Illinois; around 30 to 36 in further south. Check your village or city code. |
| Soil | Clay across the Chicago area and much of the state. It drains slowly, so a compacted gravel base and a slope away from the house matter. |
| Pouring season | May to October. Ask the plant for hot water and accelerator for early-spring or late-fall pours. |
- Many Chicago-area villages require a permit and a licensed contractor for driveways and work at the street.
- Slope driveways and patios away from the house; on clay, water that sits under a slab freezes and lifts it.
- Do not use de-icing salt on a new driveway its first winter; use sand for traction.
Frost depths and permit rules are set by your city or county; check with the local building department before you dig. A permit for a small residential slab or driveway typically costs about $50 – $350.
Price Your Own Slab in Illinois
The calculator below starts at Illinois prices. Enter your size, thickness, finish and reinforcement; if you have local prices for ready-mix or labor, type them over the defaults.
Concrete Slab Cost & Volume Estimator
Precision multi-layer project budgeting: Materials, Sub-Base, Reinforcement, Labor & Equipment
Picking a location sets the ready-mix, excavation and labor rates below to that area's typical level. You can still type your own local prices afterwards. Slab prices by state.
Closer spacing uses more steel and raises the rebar cost.
Not charged when bagged concrete is selected.
A scaled plan of your slab: rebar grid at the spacing you chose, support chairs about every 3 to 4 ft, and the recommended control-joint saw cuts (2.5 times the thickness in inches, in feet, capped at 15 ft). It redraws as you change the inputs.
| Scope Item / Material Description | Amount |
|---|
Enter the total your contractor quoted. We compare it with a benchmark for the same slab and scope you set in the calculator: materials at your entered prices plus labor at the regional standard rate, before any overhead or profit. Make sure the calculator scope (base, rebar, finish, pump, demolition) matches what the bid includes.
Optional: enter the bid's line items to see where the markup sits
Enter the forecast for pour day. The check follows ACI 306R (cold weather) and ACI 305R (hot weather) and estimates the surface evaporation rate that drives plastic shrinkage cracking.
How These Prices Are Worked Out
These are modelled prices, not quotes collected from Illinois contractors. Each project is priced with the same line items as the slab cost calculator at national unit prices, then Illinois's location factor of 1.10 is applied to ready-mix concrete and labor, as the calculator does when you pick Illinois. Bagged concrete, forms, rebar and the delivery fee stay at national prices. The factors are approximate, set by our editors to reflect typical construction cost differences between states; the full method is in the 2026 concrete price report.
Have a quote already? Check it with the concrete quote checker, which uses the same factors.
Illinois Concrete Questions
About $7.50 to $14.00 per sq ft installed for a 4-inch slab with forms, a broom finish and labor, 10% above the national average. A 12 x 12 ft patio runs about $1,210 to $2,100 and a 24 x 24 ft garage floor (5 in) about $4,590 to $8,080. Excavation, gravel and permits are extra.
A 20 x 40 ft driveway, 5 inches thick with rebar and a broom finish, costs about $6,300 to $11,130 installed in Illinois ($7.50 to $14.00 per sq ft). Removing an old driveway and the street apron are extra.
About $149 to $176 per cubic yard for 3,000 PSI ready-mix before delivery fees, and about $157 to $198 for 4,000 PSI. Small loads add a short-load fee of $80 to $200 or more.
In the Chicago area our model puts 3,000 PSI ready-mix at about $165 to $195 per cubic yard before delivery, and a 4-inch slab at about $8.00 to $15.00 per sq ft installed, 22% above the U.S. average. A 12 x 12 ft patio runs about $1,310 to $2,250 and a 20 x 40 ft driveway about $6,890 to $12,040.
For a 20 x 40 ft, 5-inch driveway our model gives about $6,890 to $12,040 in the Chicago metro, against $5,820 to $10,380 at national average prices. Tear-out of an old driveway and the street apron are extra.
They are the site's national cost model with Illinois's location factor (1.10) applied to ready-mix and labor, the same thing the calculator does when you pick Illinois. They are modelled estimates, not prices collected from Illinois contractors; get local quotes before you build.