Concrete Slab Cost Per Square Foot
Concrete slab cost per square foot runs $6 to $12 installed in 2026, with a national average near $8 for a standard 4 inch residential pour. A 6 inch slab for a driveway or garage floor typically costs $10 to $12 per square foot. Below is the per square foot price broken down by thickness, region, reinforcement and finish, plus a calculator that turns your exact dimensions into cubic yards and cost.
Key takeaways
- A standard 4 inch concrete slab costs $8 to $10 per square foot installed in 2026; a 6 inch slab runs $10 to $12.
- Materials make up $3 to $7 per square foot and labor $3 to $5, with site prep adding $1 to $3 more.
- Each extra inch of thickness adds about $0.50 to $1.25 per square foot in material cost alone.
- Coastal and high-cost metros like California and New York run 20 to 40% above central US rates of about $5.35 per square foot.
- Rebar reinforcement adds $0.40 to $1.40 per square foot; stamped or polished finishes can push the total to $8 to $20 per square foot.
Concrete slab cost per square foot: the 2026 range
Most residential concrete slabs cost $6 to $12 per square foot installed in 2026, with the national average sitting close to $8 per square foot for a standard 4 inch pour with a broom finish.
That figure bundles the ready-mix concrete, the crew to form and finish it, and basic site prep. Some premium markets and small jobs with a mobilization minimum push the per square foot rate toward $10 to $13.
To turn that average into a real number for your job, enter your length and width in the concrete slab calculator and it returns cubic yards, bag counts and an estimated total cost.
Cost per square foot by slab thickness
Thickness is the biggest driver of price per square foot, since a thicker slab uses proportionally more concrete for the same footprint. A 6 inch slab uses about 50% more concrete by volume than a 4 inch slab over the same area.
| Thickness | Typical use | Cost per sq ft |
|---|---|---|
| 4 inches | Patios, walkways, sheds | $8 to $10 |
| 5 to 6 inches | Driveways, garage floors | $10 to $12 |
| 6+ inches, commercial | Heavy-load or commercial slabs | $10 to $18 |
Each additional inch of thickness adds roughly $0.50 to $1.25 per square foot in material cost, since labor to form and finish barely changes with depth. Residential concrete code ACI 332 sets 4 inches as the baseline for unheated slabs and recommends thicker sections under vehicle loads.
For a deeper look at how much thickness a specific project needs, see how thick a concrete slab should be before pricing the job.
What is included in the price per square foot
The installed cost per square foot splits into four buckets: materials, labor, site prep and equipment. Knowing the split helps you check whether a quote is missing a step.
| Cost item | Per sq ft | Share of total |
|---|---|---|
| Ready-mix concrete | $3 to $7 | 40 to 50% |
| Labor to form, pour, finish | $3 to $5 | 45 to 55% |
| Site prep and grading | $1 to $3 | 10 to 15% |
| Equipment and delivery | included above | 5 to 10% |
Ready-mix concrete itself is priced by the cubic yard, not the square foot. Standard 3,000 psi mix runs $125 to $145 per cubic yard delivered in 2026, and upgrading to 4,000 to 4,500 psi adds $10 to $40 per yard.
One cubic yard covers about 81 square feet at 4 inches thick, which is why the material cost per square foot for a basic 4 inch slab lands near $1.50 to $2.20 before labor and prep are added.
How region changes the price per square foot
Location shifts the per square foot price more than almost any other factor. Central US markets average around $5.35 per square foot for a standard slab, while coastal states like California and New York can reach $8.50 or more.
Coastal and high-cost metros typically run 20 to 40% above central US rates for identical concrete work, driven by labor rates, permit fees and material freight. In Florida, for example, a 4 inch slab runs about $6.50 to $8.50 per square foot and a 6 inch slab about $8 to $10.50.
Getting two or three local quotes for the same specification is the only reliable way to know where your market sits, since labor rates alone can swing an identical bid by 20 to 30%.
Reinforcement and finish: what pushes the price up
Reinforcement adds a predictable amount per square foot on top of the base slab price. Wire mesh runs $0.15 to $0.50 per square foot for light-duty patios and sidewalks, while a rebar grid runs $0.40 to $1.40 per square foot for driveways and anything under vehicle load.
Rebar sizing follows ASTM A615, with #4 bar (soft metric #13, or 10M in Canada) common in residential slabs. A driveway that needs to carry a vehicle should be priced with rebar, not mesh alone, per ACI 332 guidance.
Decorative finishes cost far more per square foot than a plain broom finish. Stamped concrete runs $8 to $20 per square foot and polished concrete runs $3 to $15, depending on pattern complexity and the number of coloring or sealing passes.
Driveways combine several of these add-ons at once, which is why concrete driveway cost often lands well above a basic patio slab on a per square foot basis.
Getting an exact price for your slab
Per square foot averages are useful for budgeting, but the only way to get an exact number is to work from your actual dimensions and thickness. Volume, not area, is what a concrete supplier actually charges for.
Start by converting your footprint and thickness into cubic yards, then price that volume at the $125 to $175 per cubic yard delivered rate for 2026, and add labor and site prep on top. The general concrete calculator handles that conversion for slabs, footings and columns in one step.
For a slab specifically, plugging your length, width and thickness into the slab calculator returns cubic yards, the number of 60 and 80 lb bags if you are pouring by hand, and an estimated material cost, so you can compare it against any contractor bid before you sign.
Frequently asked questions
What is the average cost per square foot for a concrete slab?
How much does a 4 inch concrete slab cost per square foot?
How much does a 6 inch concrete slab cost per square foot?
Is concrete priced per square foot or per cubic yard?
How much does concrete cost per square foot for a driveway?
References
- ACI 332: Residential Concrete Code
- ASTM A615: Standard Spec for Carbon-Steel Bars (rebar)
- NRMCA: Ready Mixed Concrete
- Concrete (Wikipedia)