How Much Does a Concrete Slab Cost in 2026?
A concrete slab costs $4–$8 per square foot installed in 2026, depending on thickness, finish, and reinforcement. A 20×20 ft (400 sq ft) standard 4-inch slab costs $1,600–$3,200. Stamped or decorative finishes run $8–$15 per sq ft. Use our concrete calculator for cubic yards and bag counts.
Key facts at a glance
- •Standard 4-inch slab: $4–$8 per sq ft installed
- •6-inch slab (driveway, garage): $6–$10 per sq ft
- •Stamped concrete: $8–$15 per sq ft
- •Ready-mix delivered: $130–$200 per cu yd
- •Bag concrete (80 lb): $5–$7 each
Concrete cost per square foot
| Type | Low | Average | High |
|---|---|---|---|
4-inch smooth slab | $4 | $6 | $8 |
6-inch slab (vehicle) | $6 | $8 | $10 |
Stamped concrete | $8 | $11 | $15 |
Colored concrete | $6 | $9 | $12 |
Polished/decorative | $10 | $14 | $20 |
Total slab cost by size
| Size | Sq ft | Cost range |
|---|---|---|
10×10 | — | $400 – $800 |
12×12 | — | $576 – $1.2K |
16×20 | — | $1.3K – $2.6K |
20×20 | — | $1.6K – $3.2K |
20×30 | — | $2.4K – $4.8K |
See it before you build
Upload one photo of your home and preview your project in 30+ styles. 3 free designs with Remodel AI — no credit card.
Try Remodel AI freeFrequently asked questions
How much does a 20×20 concrete slab cost?+
Standard 4-inch slab: $1,600–$3,200 installed. 6-inch slab (suitable for vehicles): $2,400–$4,000. Stamped finish: $3,200–$6,000.
How thick should a concrete slab be?+
4 inches for residential patios and walkways. 6 inches for driveways and garages. 8+ inches for heavy vehicles or commercial use.
How long does concrete take to cure?+
Walkable: 24 hours. Vehicle-ready: 7 days. Full strength: 28 days. Don't park heavy equipment on a slab less than 7 days old.