How much does a 20x20 concrete slab cost to pour?
In typical Waco figures (2024), a 20 × 20 slab of 4- to 6-inch reinforced concrete costs $3,600 to $6,200 to pour. Nationally, a slab that size runs $2,400 to $4,800 (2026).
The same Waco figures say prices may come in lower when the concrete is unreinforced, and breaking out an old slab first adds $1.20 to $1.90 per square foot.
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What the slab is for changes the price
Thickness is one driver: national 2026 figures put a 4-inch slab at $6 to $8 per square foot and a 6-inch slab at $8 to $10. Use is another. In typical Central Texas figures for 2026, a 20 × 20 patio costs $1,600 to $4,000, and a 20 × 20 driveway $3,140 to $5,890. These are published averages, not a quote.
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