Concrete Slab Cost per Square Foot: What's in the Price (2026)

A concrete slab costs $6 to $12 per square foot installed, according to HomeGuide (February 2026): $3 to $7 for materials and $3 to $5 for labor. Two other cost guides give different ranges: This Old House (March 2026) gives $4 to $8 per square foot without saying what that range includes, and Concrete Network (July 2026) gives $6.50 to $10.50 “for materials and labor.” Multiply by your area to get a first number: a 400-square-foot slab is $2,400 to $4,800 at HomeGuide’s rate and $1,600 to $3,200 at This Old House’s. Thickness, base, reinforcement and finish decide where in those ranges a quote falls.

Three publishers, four figures

HomeGuide has two pages with different numbers, so it appears twice.

The two HomeGuide pages don’t agree on a 6-inch slab: the slab guide’s thickness table puts it at $8 to $10. Don’t average these; ask each contractor which thickness and which extras their square-foot price includes.

What’s inside one square foot

The concrete itself. Ready-mix is sold by the cubic yard, and one yard covers 81 square feet at 4 inches or 54 square feet at 6 inches. Dividing each source’s yard price by that area gives the concrete’s share of a square foot. The per-foot figures are our math, before any waste allowance:

The National Ready Mixed Concrete Association (NRMCA) advises adding “an allowance of 4 to 10 percent over plan dimensions for waste, over-excavation and other contingencies,” so the concrete share runs a little higher than the table.

Labor. HomeGuide: “Concrete slab installers charge $3 to $5 per square foot for labor on average. This includes concrete form creation.” It puts labor at 40% to 50% of the total.

Everything else. For a 4-inch slab, HomeGuide’s materials line of $3 to $7 is more than the concrete’s share at any of these yard prices. HomeGuide doesn’t itemize it, so ask your contractor what else is in their materials figure (base, forms, reinforcement). For yard pricing and delivery fees, see concrete cost per yard.

Price per square foot by thickness

The 2021 International Residential Code sets a 3½-inch minimum for slab-on-ground floors (R506.1); newer editions of the IRC exist, and your local code may differ. HomeGuide says “Most slabs are 4 to 6 inches thick,” and This Old House, citing its general contractor Tom Silva, advises a minimum of 4 inches for large slabs serving as a porch, sidewalk or patio. Mix strength moves the yard price only a little: HomeGuide lists 2,500 psi at $122 and 4,000 psi at $129 per yard delivered.

Per square foot by project

HomeGuide says prices start “as low as $4 per square foot for the most basic projects.” Concrete Network lists its project ranges under decorative concrete costs, so their upper ends include decorative work; its plain-slab figure is the $6.50 to $10.50 above. More detail by project: concrete patio cost and concrete driveway cost.

Add-ons, per square foot

Each line is one source’s figure. Some are installed totals and some are extras on top of the slab, as marked.

The 2021 IRC doesn’t require a vapor retarder under “Driveways, walks, patios and other flatwork not likely to be enclosed and heated at a later date” (R506.2.3), so that line may not belong in an outdoor quote.

Why a small slab costs more per foot

Some costs are per load or per job, not per foot. HomeGuide’s yard guide says an order under a full truck of about 10 yards “is considered a short load which adds $53 per cubic yard,” and a small trailer pump costs “$15 per cubic yard with a $125 minimum.”

Our math for a 10×10 slab at 4 inches: about 1.3 yards with NRMCA’s allowance. The short-load fee adds roughly $68 to $72, or about 70 cents per square foot. If the job needs a pump, you pay the $125 minimum rather than the $19 to $20 that 1.3 yards would cost at $15 a yard: about $1.25 per square foot for the pump alone. HomeGuide’s own size table still prices a 5×5 pad at $6 to $12 per square foot, so ask whether a minimum charge applies to your job.

Questions to ask before you sign

1. What is your price per square foot, and for what thickness?
2. What’s in the materials line besides concrete: base, forms, reinforcement?
3. Mesh, rebar or none, and what does each add per square foot?
4. Is there a minimum charge, short-load fee or pump charge?
5. Is removal of old concrete priced as its own line?
6. What psi mix is the price based on?

To turn your measurements into cubic yards and a price range from each source, try the concrete cost calculator. For the whole-job view by slab size, see cost to pour a concrete slab.

Have your own measurements? Run the concrete cost calculator — cubic yards, bags and a sourced price range for your size.

Sources

1. HomeGuide — How Much Does a Concrete Slab Cost? (2026) (written by Jennifer Carlson, dated Feb 3, 2026)
2. This Old House — How Much Does a Concrete Slab Cost? (2026 Prices) (updated Mar 17, 2026)
3. HomeGuide — How Much Does Concrete Cost Per Yard? (2026) (written by Tom Grupa, dated Jan 6, 2026)
4. Concrete Network (industry site) — Concrete Price Considerations: Cost of Concrete (updated July 14, 2026)
5. NRMCA — CIP 8, Discrepancies in Yield (rev. 2016), p. 2
6. ICC — 2021 International Residential Code, Chapter 5 (R506.1 General; R506.2.3 Vapor retarder)

Updated November 2, 2026