A concrete slab is the foundation for sheds, garages, patios, and additions — and the price comes down to size, thickness, and the prep underneath. A slab costs $4 to $8 per square foot installed in 2026, averaging around $6.
What you’re paying for
The concrete itself is only part of it. You’re also paying for forming, pouring, and finishing labor, plus the gravel base and grading that keep the slab from cracking. Reinforcement and removing an old slab add more.
Thickness depends on the load
A standard 4-inch slab handles patios and sheds. Garages, driveways, and anything bearing weight need 5–6 inches with rebar, which uses more material and costs more — but cracks far less.
The base matters most
A compacted gravel base, proper grading, and control joints are what separate a slab that lasts decades from one that cracks in a year. Don’t let a contractor skimp here.
How to save on a concrete slab
- Pour a standard size to use materials efficiently.
- Get the base and joints right rather than over-thickening everywhere.
- Combine pours (slab + walkway) in one visit to cut setup costs.
- Reinforce load-bearing slabs so you don’t pay twice for cracks.
| Item | Typical range | Notes |
|---|---|---|
| Concrete material | $1.50 – $3 / sq ft | – |
| Labor (form, pour, finish) | $1.50 – $3 / sq ft | – |
| Gravel base & grading | $0.50 – $1.50 / sq ft | – |
| Rebar / wire mesh | $0.30 – $1 / sq ft | – |
| Excavation / old slab removal | $1 – $3 / sq ft | – |
| Option | Typical range | Notes |
|---|---|---|
| Shed slab (10x12) | $500 – $1,000 | – |
| Patio slab (12x12) | $700 – $1,500 | – |
| 2-car garage (20x20) | $2,500 – $4,500 | – |
| Thicker / reinforced (per sq ft) | $7 – $12 / sq ft | – |
What affects the price
- Thickness A standard 4-inch slab is cheapest; 6-inch or thicker for heavy loads (garages, RVs) uses more concrete and rebar.
- Reinforcement Rebar or wire mesh adds cost but reduces cracking — worth it for slabs that bear weight.
- Site prep Grading, a compacted gravel base, and removing an old slab are a big part of the price and the slab's longevity.
- Size & access Bigger pours cost more total but less per square foot; tight access for the truck adds labor.
- Finish A basic broom finish is cheapest; stamped, stained, or polished finishes cost more.
Concrete slab cost by state
Where you live can change the price as much as the options you pick. Labor is a big part of the bill, and construction workers are paid more in some states than others. A typical concrete slab job costs about $4.70 to $9.35 per sq ft in Hawaii (17% above the U.S. average). In Arkansas, it costs about $3.40 to $6.80 per sq ft (15% below the U.S. average).
See the typical cost in all 50 states and D.C.
| State | Typical range |
|---|---|
| Alabama | $3.50 – $6.95/sq ft |
| Alaska | $4.60 – $9.20/sq ft |
| Arizona | $3.80 – $7.60/sq ft |
| Arkansas | $3.40 – $6.80/sq ft |
| California | $4.50 – $8.95/sq ft |
| Colorado | $4 – $8/sq ft |
| Connecticut | $4.30 – $8.55/sq ft |
| Delaware | $3.90 – $7.85/sq ft |
| District of Columbia | $4.30 – $8.65/sq ft |
| Florida | $3.65 – $7.30/sq ft |
| Georgia | $3.70 – $7.35/sq ft |
| Hawaii | $4.70 – $9.35/sq ft |
| Idaho | $3.75 – $7.50/sq ft |
| Illinois | $4.60 – $9.20/sq ft |
| Indiana | $4.05 – $8.10/sq ft |
| Iowa | $3.90 – $7.75/sq ft |
| Kansas | $3.80 – $7.60/sq ft |
| Kentucky | $3.70 – $7.45/sq ft |
| Louisiana | $3.60 – $7.20/sq ft |
| Maine | $3.90 – $7.85/sq ft |
| Maryland | $4 – $8/sq ft |
| Massachusetts | $4.60 – $9.20/sq ft |
| Michigan | $4 – $8/sq ft |
| Minnesota | $4.35 – $8.70/sq ft |
| Mississippi | $3.50 – $6.95/sq ft |
| Missouri | $4.10 – $8.15/sq ft |
| Montana | $3.90 – $7.85/sq ft |
| Nebraska | $3.75 – $7.50/sq ft |
| Nevada | $4.10 – $8.25/sq ft |
| New Hampshire | $3.95 – $7.90/sq ft |
| New Jersey | $4.55 – $9.10/sq ft |
| New Mexico | $3.70 – $7.35/sq ft |
| New York | $4.40 – $8.80/sq ft |
| North Carolina | $3.60 – $7.20/sq ft |
| North Dakota | $4.05 – $8.10/sq ft |
| Ohio | $4 – $8/sq ft |
| Oklahoma | $3.65 – $7.30/sq ft |
| Oregon | $4.40 – $8.80/sq ft |
| Pennsylvania | $4.05 – $8.10/sq ft |
| Rhode Island | $4.15 – $8.30/sq ft |
| South Carolina | $3.65 – $7.30/sq ft |
| South Dakota | $3.60 – $7.20/sq ft |
| Tennessee | $3.70 – $7.35/sq ft |
| Texas | $3.65 – $7.30/sq ft |
| Utah | $3.75 – $7.50/sq ft |
| Vermont | $3.90 – $7.75/sq ft |
| Virginia | $3.80 – $7.60/sq ft |
| Washington | $4.65 – $9.30/sq ft |
| West Virginia | $3.80 – $7.60/sq ft |
| Wisconsin | $4.15 – $8.30/sq ft |
| Wyoming | $3.95 – $7.90/sq ft |
These are numbers to plan with, not quotes. Each one is this guide's U.S. range, adjusted for what construction workers earn in that state. See every state cost guide or how we estimate.
Common questions
- How much does a concrete slab cost per square foot?
- Most concrete slabs run $4–$8 per square foot installed, averaging about $6. Thicker, reinforced slabs for garages or heavy loads run $7–$12. Site prep and rebar drive most of the variation.
- How much is a concrete slab for a 2-car garage?
- A 20x20 (400 sq ft) garage slab typically costs $2,500–$4,500, since garages usually need a thicker, reinforced 6-inch slab to handle vehicle weight.
- How thick should a concrete slab be?
- Four inches is standard for patios and sheds. Garages, driveways, and anything bearing heavy loads should be 5–6 inches with rebar. Thicker slabs cost more but resist cracking under weight.
- Why do concrete slabs crack?
- Usually a poor base or no control joints. A compacted gravel base, proper thickness, rebar, and control joints cut every inch into manageable sections are what keep a slab from cracking.
- Can I pour a concrete slab myself?
- A small shed or patio slab is a doable DIY if you're comfortable with forms and finishing in a short working window. Larger slabs, anything load-bearing, or sloped sites are better left to pros.
How we estimate: These are typical U.S. prices for materials and for hiring a pro to install them. We checked them against the 2026 sources listed below (see how we get our numbers). Your price depends on where you live, the size of the job and the materials you pick. Get two or three written bids before you choose a contractor.
Sources
We checked the prices on this page against 2026 numbers from these sources:
- Concrete Slab Cost (2026), HomeGuide
- How Much Does a Concrete Slab Cost?, Angi
- How Much Does a Concrete Slab Cost?, Bob Vila