A 30 by 30-foot concrete slab at 4 inches thick typically runs in the low-to-mid five figures when site prep, labor, and finishing are included. Price is driven by concrete volume, regional labor rates, access for delivery, and any required site prep or permits. This guide breaks down typical costs and provides real-world ranges for U.S. buyers.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Concrete (volume ~11.1 cu yd) | $1,200 | $1,600 | $1,900 | Includes mix and basic delivery |
| Labor | $2,000 | $3,000 | $4,000 | Placement, finishing, joints |
| Equipment & Tools | $350 | $600 | $950 | Forms, power trowel, consolidation |
| Permits | $0 | $100 | $200 | Depends on local rules |
| Delivery / Disposal | $200 | $500 | $800 | Truck access, haul-away concrete washout |
| Overhead & Contingency | $150 | $350 | $700 | Small projects to cushion unforeseen items |
| Total (estimates) | $3,900 | $6,200 | $9,550 | Assumes standard site prep; variations occur |
Overview Of Costs
Costs typically range from roughly $3,900 to $9,500 for a 30×30 slab at 4 inches, with most projects landing near $6,000. The total price includes concrete volume, labor to pour and finish, and equipment. Per-square-foot pricing often falls in the $4 to $9 range, depending on region and site conditions.
Cost Breakdown
The following table shows how a project of this size usually allocates funds. Each line includes a brief assumption to guide budgeting.
| Category | Low | Average | High | Assumptions |
|---|---|---|---|---|
| Materials | $1,200 | $1,600 | $1,900 | 11.1 cu yd @ $110–$170/yd |
| Labor | $2,000 | $3,000 | $4,000 | Pour, finish, control joints, cure |
| Equipment | $350 | $600 | $950 | Forms, screed, power trowel |
| Permits | $0 | $100 | $200 | Local permit/inspection if required |
| Delivery/Disposal | $200 | $500 | $800 | Delivery to site; washout disposal |
| Overhead & Contingency | $150 | $350 | $700 | Soft cushion for unexpected items |
Assumptions: region, slab access, and curing method vary; totals reflect typical residential flatwork.
Factors That Affect Price
Volume and thickness are primary drivers. The 11.1 cubic yards required for a 30×30 at 4 inches set the baseline. If thickness increases to 5 inches or the area expands to 40×40, costs rise noticeably due to additional concrete, labor hours, and jointing. Local labor rates can swing costs by ±15%–30% depending on urban versus rural markets.
Cost Drivers
Site access and prep impact both material waste and labor time. Narrow driveways, restricted access, or the need for grading and sub-base installation add to the total. Concrete mix and additives influence per-yard price; faster-curing or self-compacting mixes cost more upfront but may reduce finishing time. Finishing requirements (broom finish, smooth finish, exposed aggregate) shift labor and equipment needs.
Ways To Save
Get multiple bids from local contractors. Compare baseline specifications (thickness, joint spacing, cure method) to ensure apples-to-apples pricing. Pre-plan joint locations to minimize cutting and finishing time. Consider when possible, standard gray concrete instead of specialty colors or textures, which adds cost.
Regional Price Differences
Prices vary by region due to labor and material costs. In the Northeast, expect higher labor rates; the Midwest tends to be more affordable; the West can vary with supply chain factors. A rough regional delta is approximately ±15% in most markets, with urban centers leaning higher than rural sites. Regions with strict permit regimes may add $100–$200 in fees on typical projects.
Labor & Installation Time
Flatwork for a 30×30 slab typically spans 1–2 days on-site for a small crew. The first day covers forms and pour; finishing and curing occupy the remainder. If soil stabilization or extensive grading is required, crews may extend work by half to a full day. Labor hours directly influence overall cost; a longer project means higher labor bonds and potential overtime.
Real-World Pricing Examples
Basic scenario: Standard gray concrete, 4-inch slab on compacted base, broom finish, 1 control joint every 6–8 feet. Specs: 30×30, no color or texture. Hours: 8–10 total; Materials: 11.1 yd³; Total estimate: $4,000–$5,200. Assumptions: region, typical access.
Mid-Range scenario: Add control joints every 6 feet, standard curing, minimal rework, delivery with flexible schedule. Specs: 30×30, slight grade work, 4-inch depth. Hours: 10–14; Materials: 11.1 yd³; Total estimate: $5,500–$7,000.
Premium scenario: Colored or stamped finish, sealant, extra curing time, improved base compaction, and expedited delivery. Specs: 30×30, 4 inches, decorative finish. Hours: 14–20; Materials: 11.1 yd³; Total estimate: $7,500–$9,500.
Assumptions: region, specs, labor hours.