Homeowners typically pay to pour a 40 by 80 ft concrete slab, with total costs driven by thickness, reinforcement, site prep, and access. The price range reflects variations in concrete mix, labor rates, and local permit requirements. Cost ranges include materials, labor, and common extras to help budgeting.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Materials (concrete, rebar, forms) | $4,800 | $9,600 | $19,200 | Assumes 4-inch slab with basic reinforcement |
| Labor | $4,000 | $9,600 | $14,400 | Includes site prep, pouring, finishing |
| Equipment | $1,200 | $2,400 | $4,800 | Tools, pump truck or mixer rental |
| Permits | $100 | $600 | $2,000 | Depends on city/county requirements |
| Delivery/Disposal | $400 | $1,200 | $3,000 | Concrete delivery and waste removal |
| Contingency | $400 | $2,000 | $4,000 | Unforeseen site issues |
Assumptions: region, thickness, soil conditions, slope, and access.
Overview Of Costs
Typical cost range for a 40×80 ft concrete slab translates to roughly 3,200 square feet, with per-square-foot estimates between $4 and $9 depending on thickness and reinforcement. The total project commonly falls between about $12,800 and $28,800, with midpoints near $19,200. Per-square-foot pricing captures variances in labor markets and material costs across regions.
Cost Breakdown
The following table breaks out major cost components for this project, using totals and unit references where applicable.
| Component | Low | Average | High | Notes |
|---|---|---|---|---|
| Materials | $4,800 | $9,600 | $19,200 | Includes concrete, reinforcement, forms |
| Labor | $4,000 | $9,600 | $14,400 | Pouring, finishing, curing supervision |
| Equipment | $1,200 | $2,400 | $4,800 | Mixers, pumps, compactors |
| Permits | $100 | $600 | $2,000 | Local permit and inspection costs |
| Delivery/Disposal | $400 | $1,200 | $3,000 | Concrete delivery and waste hauling |
| Contingency | $400 | $2,000 | $4,000 | Site-specific surprises |
What Drives Price
Key drivers include slab thickness, reinforcement type (plain vs. rebar vs. welded wire mesh), soil readiness, and access for equipment. Higher-grade concrete, longer pours, or incorporated additives raise both material and labor costs. SEER-rated or specialized mixes typically add cost, while simpler, unreinforced slabs cost less but may limit use. Regional construction labor rates also affect overall pricing.
Labor, Hours & Rates
Labor hours scale with slab size, site clearing, and finish quality. A 4-inch slab on grade with basic broom finish for 3,200 sq ft commonly requires 10–18 hours of skilled crew time plus setup. In some markets, crews charge per hour, often ranging from $60 to $120 per hour per crew. Expect higher bids in dense urban areas and on sloped or congested lots.
Regional Price Differences
Prices vary by region due to labor markets and material transport costs. For the same 3,200 sq ft slab, estimates may diverge as follows.
- West Coast: typically 5–15% higher than national average due to labor and permitting complexity.
- Midwest: near national average, with occasional discounts where competition is high.
- Southeast: often 0–10% lower, depending on demand and material access.
Additional & Hidden Costs
Hidden or optional items can significantly shift totals. Common extras include site grading and drainage improvements, thicker sections for garages or driveways, cure-and-seal systems, and temporary power. For slab-on-grade projects, extra edging or control joints may add to materials and labor. Budget for weather-related delays in winter and spring pour windows.
Real-World Pricing Examples
Three scenario cards illustrate typical quotes for a 40×80 ft slab under common conditions. Assumptions cover thickness, reinforcement, and site readiness.
-
Basic Scenario
- Spec: 4-inch unreinforced slab, broom finish
- Labor: ~10 hours
- Per-unit: $4-$6/sq ft
- Total: $12,800–$19,200
-
Mid-Range Scenario
- Spec: 4-inch slab with welded wire mesh and simple grading
- Labor: ~14 hours
- Per-unit: $5-$7/sq ft
- Total: $16,000–$22,400
-
Premium Scenario
- Spec: 4–6 inch slab with rebar, control joints, decorative finish
- Labor: ~18–20 hours
- Per-unit: $7-$9+/sq ft
- Total: $22,400–$28,800+
