If you're planning a concrete slab — whether for a shed, patio, garage, or foundation — the first question is almost always: "How much is this going to cost?"
The short answer? $4 to $15 per square foot, depending on where you live, what you're building, and who you hire. But the real answer is far more nuanced.
This guide cuts through the guesswork. We've analyzed data from multiple sources — HomeAdvisor, Angi, the National Ready Mixed Concrete Association, and contractor estimates across the US — to give you a clear, data-driven picture of concrete slab costs in 2026.
The Big Picture: Cost Summary
| Metric | Range | Source |
|---|---|---|
| Cost per square foot | $4 – $15 | RM4L, HomeBuddy |
| Concrete per cubic yard | $125 – $165 | MidWest Precast |
| Typical project total | $2,000 – $8,000 | HomeBuddy |
| 10×10 slab (100 sq ft) | $400 – $800 | RM4L |
| 20×20 slab (400 sq ft) | $2,400 – $4,800 | MidWest Precast |
| Labor as % of total | 40% – 60% | Angi 2026 |
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Concrete Slab Cost CalculatorWhat Actually Drives the Cost?
Based on industry data, here are the five biggest factors that determine what you'll pay.
1. Slab Thickness
Thickness is the single biggest cost driver. More thickness = more concrete = higher cost.
| Thickness | Best For | Cost per sq ft |
|---|---|---|
| 4 inches | Patios, walkways, shed pads | $4 – $8 |
| 5 inches | Light-use driveways, porches | $5 – $9 |
| 6 inches | Driveways, garage floors | $6 – $10 |
| 8 inches | Heavy equipment, commercial | $8 – $12 |
What the data says: A standard 4-inch slab is sufficient for most residential projects. Each additional inch adds roughly $1–$2 per square foot. For a 500 sq ft slab, going from 4 inches to 6 inches adds about $1,000–$2,000 to your total.
2. Reinforcement
Concrete is strong under compression but weak under tension. Reinforcement prevents cracking.
| Reinforcement Type | Cost Range | Best For |
|---|---|---|
| Wire mesh | $0.40 – $1.00 per sq ft | Light-duty slabs, patios |
| Rebar | $1.40 – $1.85 per foot | Driveways, garages, foundations |
| Fiber mesh | $10 – $15 per cubic yard | Crack-resistant floors |
3. Site Preparation
Site prep is often overlooked — and it can cost thousands.
| Prep Work | Average Added Cost |
|---|---|
| Basic grading | $500 – $1,500 |
| Excavation and leveling | $1,000 – $3,500 |
| Gravel sub-base | $1 – $3 per sq ft |
| Permits | $50 – $1,000 |
What the data says: If the concrete truck can't reach your site, you may need a concrete pump — costing $400–$800 per day. Poor soil conditions can add $0.50–$2.00 per square foot for grading.
4. Labor
Labor typically makes up 40% to 60% of your total foundation cost.
| Category | Cost per sq ft |
|---|---|
| Labor only | $2 – $5 |
| Materials only | $3.50 – $7 |
| Installed total | $6.50 – $10.50 |
What the data says: Labor rates vary dramatically by region. High-demand metro areas typically have higher rates and longer lead times.
5. Location & Delivery
Concrete prices vary by region. A standard concrete truck holds 10 cubic yards; if you order less, you'll pay a short-load fee of $40–$110.
| Cost Component | Typical Range |
|---|---|
| Concrete material | $125 – $165 per yard |
| Short-load fee | $40 – $110 per load |
| Delivery fee | $50 – $150 |
| Pump hire | $400 – $800 half-day |
Cost by Project Type
Different projects require different specs — and different budgets.
| Project Type | Thickness | Cost per sq ft | Total Cost (Example) |
|---|---|---|---|
| Shed foundation | 4 inches | $4 – $8 | $400 – $800 (10×10) |
| Patio (plain) | 4 inches | $4 – $12 | $700 – $2,400 (small) |
| Patio (stamped) | 4 inches | $9 – $30 | $1,500 – $5,000+ |
| Driveway/garage | 6 inches | $8 – $15 | $2,400 – $4,800 (400 sq ft) |
| Slab foundation | 4-6 inches | $6.50 – $10.50 | $13,000 – $26,000 (2,000 sq ft) |
Hidden Costs Most Homeowners Miss
Based on contractor data, here are the costs that catch people off guard:
| Hidden Cost | Typical Range |
|---|---|
| Permits | $50 – $1,000 |
| Gravel sub-base | $1 – $3 per sq ft |
| Excavation/old concrete removal | $2 – $6 per sq ft |
| Concrete pump rental | $400 – $800/day |
| Short-load fees | $40 – $110 |
| Reinforcement (rebar/mesh) | $0.40 – $1.85 per sq ft |
| Decorative finishes | $2 – $15 per sq ft |
How to Estimate Your Own Project
If you want a quick estimate, here's the math:
Volume (cubic yards) = (Length × Width × Thickness in feet) ÷ 27. For a 4-inch slab: Thickness in feet = 4 ÷ 12 = 0.33. Volume = (10 × 10 × 0.33) ÷ 27 = 1.23 cubic yards.
Material Cost = Cubic Yards × Price per Yard. At $140/yard: 1.23 × $140 = $172.
Total Cost = (Square Footage × Installed Cost per sq ft). For a 10×10 slab at $8/sq ft: 100 × $8 = $800.
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Concrete Slab Cost CalculatorFrequently Asked Questions
What's the average cost of a concrete slab in 2026?
$6 to $12 per square foot installed, or $4 to $8 for the concrete alone.
How much does a 20×20 concrete slab cost?
Approximately $2,400 to $4,800 for a professionally installed 4-inch slab.
How much concrete per yard?
$125 to $165 per cubic yard, with an average of $140 for standard residential mix.
Does a concrete slab need rebar?
For driveways and garages, yes. For patios and shed pads, wire mesh is usually sufficient.
Should I DIY or hire a pro?
Unless you have experience, hire a pro. Mistakes in mixing, leveling, or finishing can cost more to fix than the savings.
How thick should my slab be?
4 inches for patios and walkways, 6 inches for driveways and garages.
How long does concrete take to cure?
24-48 hours to walk on, 7 days for light traffic, 28 days for full strength.
What's the most expensive part of a slab?
Usually labor, which can account for 40-60% of the total cost.
Data Sources
- RM4L Concrete Slab Cost Guide (2026)
- MidWest Precast Average Concrete Slab Cost (2026)
- HomeBuddy Concrete Slab Cost Guide (2026)
- BuildWise 10x20 Slab Pricing Guide (2026)
- CostToBuild Residential Foundations (2026)
- Home Project Calculators Concrete Cost Calculator
- Angi Foundation Cost Data (2026)
- Concrete Network Prices (2026)