Homeowners and builders typically pay for a 40×80 concrete slab based on thickness, reinforcement, subgrade prep, and local labor rates. The price range reflects access, material quality, and site conditions, with cost drivers including forms, steel, and finishing. The following numbers cover common scenarios in the United States.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 40×80 slab area | $0 | $0 | $0 | Area is fixed at 3,200 sq ft for pricing context |
| Concrete (4 inches thick, standard mix) | $3.50/sq ft | $4.50/sq ft | $5.75/sq ft | Material cost only; does not include labor |
| Concrete (6 inches thick) | $4.50/sq ft | $5.50/sq ft | $7.25/sq ft | Common for shop floors or driveways |
| Formwork and placement labor | $2.00/sq ft | $3.50/sq ft | $5.00/sq ft | Includes labor for setting forms and pouring |
| Reinforcement (wire mesh or rebar) | $0.20/sq ft | $0.40/sq ft | $0.75/sq ft | Depends on mesh type and spacing |
| Subgrade prep | $0.50/sq ft | $1.50/sq ft | $3.00/sq ft | Grading, moisture control, compaction |
| Finishing and curing | $0.75/sq ft | $1.50/sq ft | $2.50/sq ft | Texture, broom, trowel, curing agents |
| Permits and inspections | $250 | $800 | $2,000 | Depends on jurisdiction |
| Delivery and disposal | $50 | $150 | $400 | Material delivery and old concrete haul-off |
Assumptions: Midwest labor rates, standard 4-inch thickness with basic finish, no complex slope or overlays, typical residential site access.
Total 40×80 Concrete Slab Cost Range
For a 3,200 sq ft slab at 4 inches thick, expect $14,000 to $23,000 total. The low end reflects basic materials, standard labor, and straightforward access, while the high end assumes 6-inch thickness, added reinforcement, and permitting challenges. Per-square-foot pricing typically ranges from about $4.50 to $8 per sq ft, with regional variation.
Major Cost Components in a 40×80 Slab Quote
Concrete, formwork, reinforcement, and site prep drive the bulk of the price. The breakdown helps buyers compare bids side by side.
| Cost Component | Low | Average | High | Notes |
|---|---|---|---|---|
| Materials (concrete and reinforcement) | $2.60/sq ft | $4.00/sq ft | $6.50/sq ft | Includes cement, aggregate, steel |
| Labor for formwork and pour | $2.00/sq ft | $3.50/sq ft | $5.00/sq ft | Crew size and access vary |
| Site prep and subgrade | $0.50/sq ft | $1.50/sq ft | $3.00/sq ft | Moisture control, grading |
| Finishing and curing | $0.75/sq ft | $1.50/sq ft | $2.50/sq ft | Broom finish, cure sealers |
| Permits and inspections | $250 | $800 | $2,000 | Depends on local rules |
| Delivery/Haul-off | $50 | $150 | $400 | Depends on distance |
Thickness and reinforcement are the two biggest price levers. A 6-inch slab with rebar adds roughly $2.50-$3.50 per sq ft vs a 4-inch slab with mesh. Other important drivers include site access, slope, and whether a wear surface or saw-cut joints are needed.
Slab thickness from 4 to 6 inches can add roughly $1.50-$2.50 per sq ft. Reinforcement choices (wire mesh vs. rebar) shift the price by $0.20-$0.75 per sq ft. Tight sites or uphill access may require equipment rental or extra prepare work, raising costs.
Coastal and urban areas run higher than rural markets. Expect material and labor add-ons of 5% to 20% in high-cost regions, with the Midwest and Southern states often closer to the lower end. Permitting costs also vary by jurisdiction.
Control scope and timing to save money. Options include choosing 4-inch thickness, using standard mesh instead of engineered reinforcement, consolidating trenches, and scheduling during the contractor’s slower season. Consider batching deliveries to reduce haul charges and bundling with adjacent concrete work for discounts.
Project duration usually spans 1 to 3 days of work plus curing time. Labor costs reflect crew size, with 2-3 workers common for a 3,200 sq ft pour, and daily rates ranging from $400 to $1,200 depending on region and access. Curing time is separate from the installation window.
See a compact view of example bids for a 4-inch slab with standard finish.
| Bid Element | Low | Average | High | Assumptions |
|---|---|---|---|---|
| Concrete price (per sq ft) | $4.50 | $5.00 | $5.75 | Midwest, 4 in |
| Formwork and pour (per sq ft) | $2.00 | $3.00 | $4.50 | Standard forms, no complex grade |
| Reinforcement (per sq ft) | $0.25 | $0.40 | $0.75 | Mesh or rebar |
| Subgrade prep (per sq ft) | $0.75 | $1.25 | $2.50 | Moisture control included |
| Permits (flat) | $250 | $800 | $2,000 | Jurisdiction dependent |
Assumptions: Standard 4-inch thickness, basic broom finish, typical access, no slope or special finishes.