Concrete Slab Cost for a 24×35 Foot Area 2026

Buyers typically pay a mix of fixed and variable costs for a 24×35 ft (840 sq ft) concrete slab. The main cost drivers are slab thickness, reinforcement, subgrade preparation, and finishing. The price range reflects variations in materials, crew rates, and regional factors.

Assumptions: region, slab thickness, reinforcement type, subgrade prep, finish level, and labor hours.

Item	Low	Average	High	Notes
Total project (840 sq ft)	$3,800	$6,000	$11,000	Includes materials, labor, and standard finishing
Per sq ft	$4.50	$7.00	$13.00	Assumes basic to upgraded finishes

Overview Of Costs

Cost ranges reflect a typical install when the slab is pour-only with standard finishing. The cost usually scales with thickness (4″ to 6″), reinforcement (none, fibers, wire mesh, or rebar), subgrade prep, and site access. For a 24×35 ft slab, expect a spread from roughly $3,800 to $11,000 depending on options. The per-square-foot estimate commonly falls in the $4.50–$13 range.

Cost Breakdown

Component	Low	Average	High	Notes	Assumptions
Materials	$1,900	$2,900	$5,600	Cement, aggregates, reinforcing steel or fibers	4″ slab with fiber or rebar; concrete mix standard
Labor	$1,400	$2,700	$5,000	Forming, pouring, finishing	2–3 workers for 2–3 days; local rates
Equipment	$150	$500	$1,200	Concrete mixer, vibrator, finishing tools	Rental or rental-purchase per project
Permits	$0	$150	$600	Local permits or inspections if required	Residential, standard lot
Delivery / Disposal	$400	$900	$1,600	Delivery of ready-mix and removal of waste	Typical local delivery charge
Contingency	$0	$250	$500	Unforeseen site conditions	5–10% of subtotal

What Drives Price

Thickness, reinforcement, and subgrade prep are the top price drivers. A 4″ slab with no reinforcement is cheaper than a 6″ slab with rebar. Subgrade moisture issues, drainage improvements, and compaction requirements add cost. Site accessibility and removal of old pavement or debris can shift both materials and labor pricing.

Cost Drivers

Regional variation and labor rates matter. Urban areas tend to be higher than rural; contractor availability and transport distances affect delivery fees. Weather impacts pour scheduling and potential overtime costs.

Ways To Save

Consider optimizing thickness and reinforcement mix. A 4″ slab with fiber reinforcement can reduce labor time and materials versus a thicker rebar design. Scheduling during mild weather and obtaining multiple quotes helps lock in favorable prices.

Regional Price Differences

Regional pricing can shift total by ±15–25%. Three representative regimes show different cost profiles:

• Coastal metro areas: higher labor and permit costs, often $8–$13 per sq ft total
• Midwest suburban: moderate costs, typically $5–$9 per sq ft
• Rural Southwest/Southeast: lower delivery and rate pressures, around $4–$7 per sq ft

Labor & Installation Time

Time on site varies by thickness and finish. A basic 4″ pour with broom finish might require 1–2 days; thicker pours with multiple finishes can extend to 3–4 days. Local crew rates commonly range from $50–$90 per hour per crew, with a typical crew of 2–3 workers.

Additional & Hidden Costs

Hidden costs can surprise without planning. Portal access, site cleanup, curing compounds, and form rental may add 5–15% to the base price. If the site requires drainage corrections or soil stabilization, expect further increases.

Real-World Pricing Examples

Three scenario cards illustrate typical outcomes for a 24×35 ft slab.

Assumptions: region, slab thickness, reinforcement, finish level, and labor hours.