How Much Does a Concrete Slab Cost Per Square Foot
A concrete slab is one of the most common home improvement investments, but “cost per square foot” varies widely by thickness, finish, and whether you pour ready-mix or mix bags by hand. This guide breaks down realistic 2025–2026 US price ranges so you can budget with confidence.
The short answer by thickness
Most patios, walkways, and shed floors use a 4-inch slab. Driveways and anything that sees vehicle traffic usually call for 5–6 inches. Because cost scales almost directly with the amount of concrete, a thicker slab costs proportionally more in both material and labor. A plain, broom-finished gray slab is the budget option; a stained, stamped, or exposed-aggregate finish can add $2–$8 per square foot on top of the base price.
4-inch vs 6-inch cost breakdown
| Factor | 4-inch slab | 6-inch slab |
|---|---|---|
| Concrete material only | $2.00–$3.50 / sq ft | $3.00–$5.00 / sq ft |
| Installed cost (typical) | $6–$10 / sq ft | $8–$13 / sq ft |
| Best use | Patios, sheds, walkways | Driveways, RV pads |
| Extra cost vs 4-inch | — | +30% to +40% |
For a 10x10 foot pad (100 sq ft), that works out to roughly $600–$1,000 for a 4-inch slab and $800–$1,300 for a 6-inch slab, installed. Your regional labor rate moves the total far more than the concrete price does, so treat these as planning ranges rather than firm quotes.
Ready-mix vs bagged concrete
How you buy the concrete changes the math. A single 80-pound bag yields about 0.6 cubic feet, so one cubic yard (27 cubic feet) needs roughly 45 bags. At $4–$6 per bag, the material alone for a cubic yard runs $180–$270. Ready-mix delivered is typically $110–$165 per cubic yard, and the plant controls the mix quality.
| Factor | Bagged concrete | Ready-mix |
|---|---|---|
| Material cost / cubic yard | $180–$270 | $110–$165 (delivered) |
| Best for | Under ~1 cubic yard | Over ~1 cubic yard |
| Labor | You mix each bag | Truck pours the load |
| Consistency | Variable | Plant-controlled |
What else affects the price
- Site prep: Grading, excavation, and a 4–6 inch gravel base add material and labor before any concrete is poured.
- Reinforcement: Rebar or wire mesh for driveways and slabs on unstable soil adds cost but reduces cracking.
- Finishing: Broom finish is cheapest; stamping, staining, or polishing adds $2–$8 per square foot.
- Delivery: Long pump distances, remote sites, and minimum-load charges can push ready-mix prices higher.
Always collect two or three local quotes. Regional labor differences routinely swing the total more than the concrete itself.
Estimate your project
Use our Concrete Slab Calculator for instant cubic-yard, bag counts, and cost estimates at your chosen thickness. If your project also includes a block or brick wall, our Block Calculator and Brick Calculator help you size those materials too. Browse the full set of tools on our Concrete & Masonry hub.
Ways to keep slab costs down
- Collect three quotes: Labor varies most by region, so competing bids reveal your real local price.
- Keep the shape simple: Square and rectangular slabs waste less form material and labor than curves.
- Choose a broom finish: Decorative stamping or staining can double the finishing cost for little structural gain.
- Time your pour: Late spring and early fall are busy seasons; shoulder-season scheduling can lower labor rates.
- Buy ready-mix above one yard: Once you pass roughly one cubic yard, delivered concrete almost always beats bagged.
Small savings on each of these add up. A $900 slab can often be brought under $750 with smart planning and a simple finish.