Concrete Slab Cost in North Carolina
Quick answer: a 4-inch concrete slab in North Carolina costs about $6.00 – $12.00 per sq ft installed, 12% below the U.S. average. A 12 × 12 ft patio runs about $1,040 – $1,820, a 24 × 24 ft garage floor $3,830 – $6,890 and a 20 × 40 ft driveway $5,240 – $9,470.
North Carolina prices are below the national average in our model. The state spans three climates, from the mild coast to the clay of the Piedmont to mountain towns with real winters, and the right slab spec changes with them.
Concrete Prices in North Carolina by Project
| Project | North Carolina installed | Per sq ft | U.S. average | DIY materials |
|---|---|---|---|---|
| 12 × 12 ft patio | $1,040 – $1,820 | $7.00 – $13.00 | $1,130 – $1,970 | $480 – $710 |
| 10 × 12 ft shed slab | $890 – $1,550 | $7.00 – $13.00 | $970 – $1,680 | $430 – $620 |
| 20 × 20 ft slab | $2,550 – $4,640 | $6.00 – $12.00 | $2,810 – $5,060 | $1,010 – $1,650 |
| 24 × 24 ft garage floor (5 in) | $3,830 – $6,890 | $6.50 – $12.00 | $4,250 – $7,540 | $1,620 – $2,540 |
| 20 × 40 ft driveway (5 in) | $5,240 – $9,470 | $6.50 – $12.00 | $5,820 – $10,380 | $2,180 – $3,460 |
| 30 × 40 ft shop floor (6 in) | $8,250 – $14,690 | $6.50 – $12.50 | $9,190 – $16,140 | $3,650 – $5,570 |
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.
Building a Slab in North Carolina
| Weathering (IRC) | Negligible to moderate on the coast and in the Piedmont; severe in the mountains. |
|---|---|
| Concrete strength | 3,000 PSI on the coast and in the Piedmont; 3,500 PSI air-entrained in the mountains. 3,000 PSI ready-mix runs about $119 – $141 per yd³ here. |
| Frost depth | 12 in in most of the state; deeper in the mountain counties (often 18 in or more). |
| Soil | Piedmont clay around Charlotte, the Triad and the Triangle; sand and a high water table in the coastal plain; rock in the mountains. |
| Pouring season | Most of the year in the east; spring to fall in the mountains. |
- On the coast, check the water table before digging a deep base; a slab on wet sand needs a thicker gravel layer and good drainage.
- In the mountains, treat the spec like a northern state: air-entrained concrete and no salt the first winter.
- Piedmont clay needs the same base prep as Georgia red clay: strip, compact, and drain.
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 North Carolina
The calculator below starts at North Carolina 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 North Carolina contractors. Each project is priced with the same line items as the slab cost calculator at national unit prices, then North Carolina's location factor of 0.88 is applied to ready-mix concrete and labor, as the calculator does when you pick North Carolina. 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.
North Carolina Concrete Questions
About $6.00 to $12.00 per sq ft installed for a 4-inch slab with forms, a broom finish and labor, 12% below the national average. A 12 x 12 ft patio runs about $1,040 to $1,820 and a 24 x 24 ft garage floor (5 in) about $3,830 to $6,890. Excavation, gravel and permits are extra.
A 20 x 40 ft driveway, 5 inches thick with rebar and a broom finish, costs about $5,240 to $9,470 installed in North Carolina ($6.50 to $12.00 per sq ft). Removing an old driveway and the street apron are extra.
About $119 to $141 per cubic yard for 3,000 PSI ready-mix before delivery fees, and about $126 to $158 for 4,000 PSI. Small loads add a short-load fee of $80 to $200 or more.
3,500 PSI air-entrained concrete for anything outdoors. The mountains are a severe weathering area, so the building code asks for more strength and air than on the coast, where 3,000 PSI is usual.
They are the site's national cost model with North Carolina's location factor (0.88) applied to ready-mix and labor, the same thing the calculator does when you pick North Carolina. They are modelled estimates, not prices collected from North Carolina contractors; get local quotes before you build.