Concrete slab pricing surprises most people because the material — the ready-mix itself — is often the smallest line on the bill. Here is what a slab actually costs in 2026, broken down so you can budget realistically from the start.
What does a concrete slab cost installed?
The industry benchmark is $4–$8 per square foot, fully installed. That range covers a standard 4-inch residential slab with a compacted gravel base, basic rebar or wire mesh, placement, and a broom finish. Where you land in the range depends on your region, access to the site, slab thickness, and the finish you choose.
A plain patio or garage floor at the low end runs around $4–$5/sq ft. A thicker driveway, sloped-grade pour, or stamped decorative finish pushes toward $7–$10/sq ft or more.
Cost breakdown: what you’re actually paying for
Here is a typical cost breakdown for a 20×20 foot (400 sq ft) slab at 4 inches thick using ready-mix and a #4 rebar grid:
| Line item | Quantity | Unit cost | Subtotal |
|---|---|---|---|
| Ready-mix concrete (with 10% waste) | ~1.6 yd³ | $160/yd³ | ~$256 |
| Base gravel (4″ compacted layer) | ~2.5 tons | $50–$80/ton delivered | ~$125–$200 |
| #4 Rebar (#4 bar, 12″ grid) | ~80 sticks | $12/20-ft stick | ~$192 |
| Forms (lumber or rental) | — | — | ~$75–$100 |
| Placing, screeding & broom finish | 400 sq ft | $1.50–$2.50/sq ft | $600–$1,000 |
| Total installed | ~$1,250–$1,750 |
That works out to roughly $3.10–$4.40/sq ft for a straightforward 20×20 pour. Add stamping, coloring, or an epoxy sealer and the total climbs quickly. On larger or more complex pours, contractor markup and mobilization fees are spread over more square footage, which often brings the per-sq-ft rate down.
Use the concrete calculator to nail down the cubic yardage for your exact dimensions, then layer labor and base material on top.
Common slab size pricing table
Estimates at $4–$8 per square foot installed. Material-only estimates assume ready-mix at ~$160/yd³ + gravel base + rebar; does not include labor, forms, or delivery fees.
| Slab size | Square feet | Material cost (est.) | Installed range |
|---|---|---|---|
| 10×10 | 100 sq ft | ~$200 | $400–$800 |
| 12×12 | 144 sq ft | ~$275 | $575–$1,150 |
| 20×20 | 400 sq ft | ~$650 | $1,600–$3,200 |
| 24×24 | 576 sq ft | ~$925 | $2,300–$4,600 |
| 30×30 | 900 sq ft | ~$1,450 | $3,600–$7,200 |
| 40×40 | 1,600 sq ft | ~$2,550 | $6,400–$12,800 |
| 40×50 | 2,000 sq ft | ~$3,200 | $8,000–$16,000 |
| 50×50 | 2,500 sq ft | ~$4,000 | $10,000–$20,000 |
Larger slabs (40×40 and up) are typically shop floors, barn pads, or small commercial projects. At that scale, mobilization costs and per-yard pricing improve significantly — contractors price these jobs more competitively than small residential pours.
Regional price variation
Labor rates and ready-mix prices both swing noticeably by region. Using the concrete cost guide price data as a baseline:
- Northeast: roughly 10–15% above the national average — higher labor costs and fuel surcharges from ready-mix plants.
- South: roughly 6–8% below national average — lower labor rates keep installed cost down.
- Midwest: close to national average, though short-load fees are common in rural areas where plants are farther from job sites.
- West: 10–12% above national average — California, Oregon, and Washington run highest; Mountain West is closer to average.
For the most accurate number, get 2–3 quotes from local contractors. Quotes should itemize material separately from labor so you can verify the yard count matches your calculator estimate.
What drives the cost up
Slab thickness. Volume scales directly — a 6-inch slab uses 50% more concrete than a 4-inch slab of the same footprint. Driveways often call for 5–6 inches; RV pads and heavy-equipment floors go thicker still.
Stamped or colored concrete. Decorative finishes add $3–$10/sq ft to labor and typically require a sealer every 3–5 years. A 20×20 stamped patio can easily run $4,000–$6,000 installed vs. $1,600 for a plain broom finish.
Pumping. When the ready-mix truck can’t reach the pour location (backyard, basement, difficult grade), a concrete pump rental adds $300–$700 to the job. On small pours this can dwarf the material cost.
Short-load fees. Ready-mix plants set minimum loads of 8–10 cubic yards per truck. A 1.5-yard pour may trigger a $150–$250 short-load fee — sometimes more than the concrete itself. See the concrete cost guide for current per-yard pricing and short-load fee guidance.
Demolition and disposal. If you’re replacing an existing slab, demo and haul-away typically adds $1–$3/sq ft.
Ready-mix vs. bagged concrete
For anything larger than a small landing or a few footings, ready-mix wins on cost per yard by a wide margin. Bagged 80 lb mix runs about $6 a bag — that’s roughly $270 per cubic yard vs. ~$160 for ready-mix. The crossover point is around 0.5–1 cubic yard (roughly a 10×10 slab at 1.5 inches). Above that, pay the short-load fee rather than mixing bags.
For very small pours where you’ll use bags, the concrete calculator lets you switch between cubic yards and bag counts and shows the cost comparison side by side.
How to budget a concrete slab project
- Calculate your cubic yardage using the concrete calculator. Enter length, width, and thickness to get yards, then add a 10% waste factor.
- Price the base material. A 4-inch compacted gravel base under the same footprint takes roughly 0.012 tons per sq ft. Use the gravel calculator to price it.
- Estimate rebar. A 12-inch grid on a 20×20 slab takes 80+ sticks of #4 bar. The rebar calculator handles the grid math.
- Get 2–3 local quotes for delivery and finishing labor. Material and labor are usually quoted together — ask contractors to break them out so you can verify the math.
- Add contingency. Concrete projects regularly run 10–15% over the initial estimate due to subgrade surprises, extra yardage, and timing fees. Budget for it upfront.