🛠️ How Concrete Contractors Calculate Costs for a 20×20 Slab in Chandler

 

Thinking about adding a 20×20 concrete slab? Here’s a breakdown of what goes into the cost:

1. 📐 Materials & Volume

A standard 4‑inch slab equals around 4.94 cubic yards (20 ft × 20 ft × 0.33 ft).
That’s roughly 222 bags of 80 lb concrete and 616 ft of rebar with overlaps included.

2. 💲 Material Pricing Locally

In Chandler, concrete typically costs between $125–$148 per yard.
Total material cost lands around $2,000–$3,000, depending on volume and delivery conditions.

3. 👷 Labor Costs

Labor for a 400 sq ft slab ranges from $3–$10 per sq ft—meaning $1,200–$4,000 total.
Complex designs or difficult site access can push labor costs higher.

4. 🔧 Site Prep & Complexity

Things like grading, excavation, slopes, or demo work can increase costs.
If an existing slab needs removal, expect additional fees around $1.20–$1.90 per sq ft.

5. 📏 Thickness & Mix Quality

Thicker slabs (6–8”) require more concrete, raising total costs to $7–$12 per sq ft.
Rebar, wire mesh, and high-strength mixes also add to the price.

6. 🏗️ Overhead & Contractor Fees

Contractor fees include equipment, insurance, permits, management, and profit margins.

✅ Putting it All Together

Component	Estimated Range
Materials	$2,000–$3,000
Labor	$1,200–$4,000
Site Prep & Demo	Variable
Overhead & Fees	Included in total

➡️ Typical total cost: $3,200–$7,000, depending on scope and site conditions.

Final Takeaway:
Understanding how concrete slab costs are calculated can help you plan better and avoid surprises.

📞 Need an estimate for your project? Contact the local experts:

Paradise Hardscapes - Pavers & Turf - Chandler
3950 W Chandler Blvd, Chandler, AZ 85226
(480) 750-4345