2026 Concrete Slab Cost Per Square Foot: $5 to $18 Installed

What Makes Up One Square Foot of Installed Concrete

The table splits a 4-inch, 20x20 slab with wire mesh into the lines our model prices, per square foot. Low uses the lowest published price and our lowest assumption on every line; high uses the highest. The share column is each line’s part of the typical total.

Shares are rounded, so they may not sum to 100. Curing compound, joints and cleanup sit inside the crew and overhead lines rather than as separate items. The method block below lists every input with its source.

4-Inch vs 6-Inch vs 8-Inch: The Thickness Math

Thickness scales the concrete in a straight line: 6 inches is half as much again as 4, and 8 inches twice as much. Thicker slabs also take a little more crew time. Against a plain 4-inch 20x20 slab at typical prices, our model adds about $1.90 per sq ft for 6 inches and $3.82 for 8 inches (8-inch also gets a 6-inch stone base). Wire mesh adds about $0.65 and a #4 rebar grid about $1.90, installed.

It is worth being precise about how little of this is code. The International Residential Code (R506.1) sets one prescriptive minimum for a residential slab on ground, 3½ inches, with the American Concrete Institute residential standard ACI 332 as the alternative design route. It adds no thicker requirement for vehicles, does not cover driveways and does not require reinforcement (R506.2.4 only governs where steel sits if you use it). Four inches for foot-traffic slabs and 6 inches with rebar for vehicle slabs are trade practice, sometimes written into local rules.

The pages on 4-inch slab pricing, 6-inch slab pricing and 8-inch slab pricing go deeper on the code and reinforcement for each thickness.

Why a Square Foot Costs Different Amounts in Different Places

The inputs themselves vary by place. On the four published ready-mix lists we use, 3,000 PSI concrete runs from $127.05 a yard (Supreme Concrete, Los Angeles, CA) to $165.00 (Scenic City Ready Mix, Tennessee, delivered). Truck charges run from nothing within 20 miles of the Nebraska plant to $418.88 a trip in Los Angeles. Cement masons’ hourly wages run from $22.60 at the 25th percentile to $32.15 at the 75th nationally (BLS, May 2025), and local wages sit inside or outside that band.

Our low and high figures stack those ends, which is why the band is wide. The cost-by-state page reprices a 20x20 patio with each state’s BLS crew wages; concrete and materials stay at the published prices. Local quotes are the real test.

What a Real Contractor Quote Should Show Per Square Foot

A flat per-square-foot price with no breakdown hides the assumptions behind it: how deep the base is, whether there is mesh or rebar, the concrete strength, the finish. Two quotes at different rates may simply be for different slabs.

A useful quote states the slab thickness, the concrete strength (3,000 or 4,000 PSI), the reinforcement and its spacing, the base depth, whether a vapor retarder is included, the finish, and the cubic yards being ordered. That last one is an easy check: a 20x20 slab at 4 inches is 4.94 cubic yards before overage. It should also say whether the permit fee, excavation and haul-off are in or out.

Bring the cost-driver checklist to each estimate meeting and ask every contractor to fill in the same lines, or run a quote through the quote checker.

Per-Sq-Ft to Total: Run the Numbers for Your Slab

Enter your slab dimensions to turn the per-square-foot range into a total for your size, thickness and reinforcement. The calculator uses the same model as every figure on this page.

What Changed in the Last Year

The Bureau of Labor Statistics producer price index for ready-mix concrete manufacturing (series PCU327320327320 on FRED) stood at 402.65 in August 2026, against 393.679 in August 2025: a rise of 2.3%. It tracks what producers charge for ready-mix, and ready-mix is about 22% of a typical slab’s price in our breakdown, so on its own it moves an installed price by much less.

We have no published series for installed slab prices, so we do not quote a year-on-year change for them, and we do not forecast 2027. Our model inputs are re-read when we update the site; the date on each page says when.

Where the Per-Sq-Ft Number Misleads

It breaks down on small slabs. The set-up work and the short-load fee are the same for a small pad as for a patio, so the same 4-inch mesh spec costs about $14.09 per sq ft at 10x10 ($1,410), $8.41 at 20x20 and $7.49 at 25x40 ($7,490). Multiplying a big-slab rate by a small area will undershoot.

Shape matters a little. A 400 sq ft slab as a 20x20 square needs 80 ft of edge forms; as a 10x40 strip, 100 ft. In our model that moves the typical price from $3,360 to $3,380. Curves and many corners take more forming time than a simple rectangle, which our model does not separately price, so expect a complicated outline to quote higher.

How We Price a Slab

Every installed price on this site comes from one model: published ready-mix and materials prices, plus crew hours priced at Bureau of Labor Statistics wages, plus overhead and margin. The low figure uses the lowest published input and our lowest assumption at every step; the high figure uses the highest. The crew hours, overage and margin are our own estimates, not published figures, and are listed below so you can check them against your quote. Worked example: a 20 x 20 ft (400 sq ft) slab (4-inch, 3,000 PSI, wire mesh, broom finish, 4-inch stone base).

Not included: excavation and soil haul-off, removing an old slab, permits, pumping, decorative finishes and sealing. Totals are national; the calculators’ state option swaps in that state’s BLS wages and leaves concrete and materials at the published lists.

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