Prices for a 30 by 30 foot concrete slab at six inches thick typically fall within a broad range, driven by material costs, labor, forms, and site prep. The main cost drivers include concrete volume, delivery, reinforcement, and site grading. This article provides practical USD pricing ranges and per-unit estimates to help buyers budget accurately.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Area | 900 sq ft | 900 sq ft | 900 sq ft | Dimensions fixed at 30′ x 30′ |
| Thickness | 6 in | 6 in | 6 in | Converted to 0.5 ft |
| Concrete (volume) | 16.7 yd³ | 16.7 yd³ | 16.7 yd³ | 0.5 ft thickness x 900 ft² |
| Material cost (concrete only) | $1,100 | $2,200 | $3,000 | Assumes $120–$180/yd³ |
| Delivery | $60 | $180 | $350 | Distance and min load apply |
| Forms & prep | $350 | $1,000 | $2,000 | Grading, forms, moisture barriers |
| Reinforcement | $150 | $500 | $1,200 | Rebar or wire mesh |
| Labor (placement) | $1,000 | $2,000 | $3,500 | Crew wages, 1–2 days |
| Equipment & fuel | $100 | $400 | $900 | Concrete pump, vibrator, mixer |
| Permits & inspections | $50 | $150 | $400 | Local rules may apply |
| Delivery/disposal surcharge | $0 | $100 | $500 | On-site disposal or recycling |
| Overhead & contingency | $150 | $500 | $1,000 | Contingency for weather/repair |
| Taxes | $0 | $150 | $520 | State/local tax |
| Estimated Total | $2,960 | $9,230 | $12,390 | Assumes standard slab with basic reinforcement |
Overview Of Costs
Typical project ranges show wide variation due to concrete price volatility, region, and site conditions. For a 30×30 slab at 6 inches, the total often lands in the mid- to upper-thousands range, with per-square-foot estimates roughly $3.00–$14.50. The per-yard pricing helps compare: concrete supply typically $120–$180 per cubic yard, plus delivery and labor. Assumptions: region, specs, labor hours.
Cost Breakdown
Concrete slab cost is driven by volume, site prep, and labor. The table below shows a practical breakdown with total ranges and per-unit context. A short note explains typical assumptions for a standard residential slab on grade with basic reinforcement.
| Category | Low | Average | High | Notes |
|---|---|---|---|---|
| Materials | $1,100 | $2,200 | $3,000 | Concrete price per yd³ and additives |
| Labor | $1,000 | $2,000 | $3,500 | Crew wages, 1–2 days |
| Equipment | $100 | $400 | $900 | Vibrator, mixer, pump |
| Forms & Prep | $350 | $1,000 | $2,000 | Grading, forms, moisture barrier |
| Delivery | $60 | $180 | $350 | Distance; may include minimum load |
| Permits | $50 | $150 | $400 | Local permit/inspection |
| Reinforcement | $150 | $500 | $1,200 | Rebar or mesh |
| Disposal/Delivery Fees | $0 | $100 | $500 | On-site waste handling |
| Overhead/Contingency | $150 | $500 | $1,000 | Unforeseen issues |
| Taxes | $0 | $150 | $520 | Local taxes |
| Total | $2,960 | $9,230 | $12,390 |
What Drives Price
Key cost factors include concrete class, reinforcement type, and site conditions. With a 6-inch slab over 900 square feet, the concrete volume is fixed at about 16.7 cubic yards, but price spikes occur with higher strength mixes, specialty additives, or tighter delivery windows. Site grading, drainage, and soil conditions add material and labor hours, especially in uneven lots. Perimeters needing forms or curbs raise formwork costs significantly.
Regional Price Differences
Prices vary by region and market density. In the table, three typical U.S. regions illustrate how costs diverge: Urban, Suburban, and Rural. Expect higher delivery fees and labor in urban cores, while rural sites may incur longer travel times and lower crew rates. Regional deltas commonly fall in the ±10–25% band around national averages, depending on supply chain conditions and local demand.
Labor, Hours & Rates
Placement time scales with slab complexity. A straightforward 900 ft² slab at 6 inches can take 8–16 hours of skilled labor, spread over 1–2 days with a small crew. Larger crews reduce days but increase equipment coordination. A mini formula tag helps: data-formula=”labor_hours × hourly_rate”> to estimate labor cost based on local wage rates.
Regional Price Differences
Three example regional comparisons show delivery and labor variance. In the Northeast, higher union wages and stricter codes can push totals upward. The Midwest often provides mid-range pricing with robust concrete supply. The Southwest may see cheaper materials but higher cooling-related moisture barriers. Assumptions: region, site access, and weather window.
Real-World Pricing Examples
Three scenario cards reflect common project profiles. Each includes specs, labor hours, per-unit pricing, and totals to help compare expectations.
Basic Scenario
Specs: 30′ x 30′ slab, 6″ thick, no added features. Labor: 8–10 hours, 1 crew. Materials: standard concrete, minimal reinforcement. Total range: $2,900–$4,000. Assumptions: suburb, dry site.
Mid-Range Scenario
Specs: 30′ x 30′ slab, 6″ thick, light reinforcement, moisture barrier. Labor: 12–14 hours, 2 crew. Materials: concrete with poly or fiber mix. Total range: $5,000–$7,500. Assumptions: regional city, standard access.
Premium Scenario
Specs: 30′ x 30′ slab, 6″ thick, heavy reinforcement, stamped finish, additional edge work. Labor: 16–20 hours, 3 crew. Materials: high-strength concrete, premium additives. Total range: $9,000–$12,500. Assumptions: urban project, tight schedule.
Note on inclusions: Prices above assume a typical residential slab on grade with basic reinforcement and standard surface finish. If a driveway or patio edge is included, or if a vapor barrier, fiber mesh, or decorative finish is desired, unit costs and totals will adjust accordingly.