Concrete Slab Cost & Thickness Guide (2026)
Whether it’s for a shed, garage, or patio, slab cost comes down to size, thickness, and prep. Here’s the 2026 picture.
Concrete slab cost in 2026
Expect roughly $5 to $9 per square foot for a standard slab. A 12×12 (144 sq ft) slab runs about $720–$1,300; a 24×24 garage slab often $3,000–$5,200. Thicker slabs, rebar, and site prep push it higher. Local rates vary.
How thick should the slab be?
- 4 inches: patios, sheds, walkways, standard residential use.
- 5–6 inches: driveways and garages (vehicle loads).
- 6+ inches: heavy equipment or commercial loads (engineered).
What else affects cost
Reinforcement (rebar/mesh), vapor barriers, grading and excavation, and concrete delivery minimums all factor in. Get itemized quotes that spell out thickness and reinforcement.
Frequently asked questions
How much does a 24×24 concrete slab cost?
Typically $3,000–$5,200 in 2026 depending on thickness, reinforcement, and site prep.
Is a 4-inch slab thick enough for a garage?
For light vehicles it can work, but 5–6 inches is recommended for garages and driveways.
Find a concrete contractor near you
Ready to get quotes? Search Premier Concrete Pro for vetted concrete contractors in your area, or browse by state.
