Cost of a 30×30 Concrete Slab 4 Inches Thick 2026
The typical cost for a 30×30 ft concrete slab that is 4 inches thick depends on materials, labor, and site conditions. Main drivers include mix design, delivery fees, formwork, and site preparation. Cost ranges reflect low, average, and high scenarios across U.S. regions.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Slab area | 900 sq ft | 900 sq ft | 900 sq ft | Plan area is fixed; thickness assumed 4 inches |
| Material & delivery (concrete) | $1,400 | $1,800 | $2,400 | Assumes standard concrete mix, delivery included |
| Labor & installation | $2,000 | $3,500 | $4,800 | Forming, pouring, screeding, finishing |
| Total project price | $3,400 | $5,400 | $9,000 | Typical project range with basic site prep |
| Per-unit price (installed) | $5.50/sq ft | $7.50/sq ft | $12.00/sq ft | Includes labor, materials, and delivery |
| Concrete volume | ~11 yd³ | ~11 yd³ | ~11 yd³ | 11.1 yd³ approximate for 900 sq ft at 4″ |
Overview Of Costs
Cost estimates for a 30×30 ft slab at 4 inches thick cover materials, labor, and delivery. The project typically ranges from about $3,400 to $9,000, with most jobs landing between $5,000 and $7,500 depending on regional pricing and site specifics. The per-unit price commonly falls in the $5.50–$12.00 per square foot band, reflecting varying local costs and prep requirements.
Cost Breakdown
Concrete slab pricing blends materials, labor, and ancillary costs. A detailed view helps buyers understand where most money goes and how changes affect the total.
| Category | Low | Average | High | Assumptions | Units |
|---|---|---|---|---|---|
| Materials | $1,400 | $1,800 | $2,400 | Concrete mix, additives | Materials |
| Labor | $2,000 | $3,500 | $4,800 | Pour, screed, finish | Labor |
| Delivery / Dump fees | $150 | $300 | $600 | Distance from plant | Delivery |
| Formwork & curing | $300 | $700 | $1,300 | Wood forms, curing blanket | Labor |
| Permits & inspections | $0 | $200 | $600 | Local rules apply | Permits |
| Equipment & clean-up | $100 | $300 | $600 | Finishing tools, removal | Equipment |
| Subtotal | $3,950 | $6,800 | $10,900 | Total |
Factors That Affect Price
Pricing varies with regional labor rates, material costs, and site access. Key drivers include concrete strength and mix (normal: 3,000–4,000 psi), delivery distance, and whether the slab requires reinforcement or special finishing.
Labor & Installation Time
Typical install times range from 1 to 3 days for a 30×30 slab. Time depends on site prep, weather, and curing needs, influencing labor hours and daily rates.
Regional Price Differences
Prices differ by region, reflecting local market conditions. For example, urban areas often carry higher labor and delivery fees than rural zones, while coastal regions may see elevated material costs due to logistics.
Real-World Pricing Examples
Three scenario cards illustrate common outcomes for the same footprint. Each scenario shows specs, hours, and totals to help set expectations.
Basic
Area: 900 sq ft; 4″ thick. Labor: 8 hours; Materials: standard mix. Total: around $4,000-$5,000.
Mid-Range
Area: 900 sq ft; 4″ thick. Labor: 16 hours; Materials: regular+reinforcement where needed. Total: around $6,500-$8,000.
Premium
Area: 900 sq ft; 4″ thick. Labor: 24 hours; Materials: high-strength mix, added vapor barrier or decorative finish. Total: around $9,000-$12,000.
Assumptions: region, specs, labor hours.