30x30 Concrete Slab Cost in 2026

Slab size	Square footage	Typical range (2026)	Per square foot
10x10	100 sq ft	$1,200 to $1,800	$12 to $18
20x20	400 sq ft	$3,600 to $6,400	$9 to $16
24x24	576 sq ft	$5,000 to $8,600	$8.50 to $15
30x30	900 sq ft	$7,200 to $16,200	$8 to $18
30x40	1,200 sq ft	$9,600 to $20,400	$8 to $17
40x40	1,600 sq ft	$12,800 to $25,600	$8 to $16
40x60	2,400 sq ft	$19,200 to $36,000	$8 to $15

A 30x30 concrete slab covers 900 square feet. At 2026 rates in Greater New Orleans, that 900-square-foot slab runs $7,200 to $16,200, with the final number set by slab thickness, subgrade condition, finish selection, and whether an existing surface requires demolition first. A site visit is what produces an actual number for a specific property.

What Determines the Price of a 30x30 Concrete Slab?

Six factors account for nearly all of the spread between a $7,200 slab and a $16,200 slab at the same 900-square-foot footprint.

How Much Does Slab Thickness Add to the Cost?

A standard 4-inch residential slab uses approximately 11 cubic yards of concrete for a 30x30 footprint. A 6-inch slab for heavier loads uses roughly 17 cubic yards. That jump from 4 inches to 6 inches adds $2 to $4 per square foot, or $1,800 to $3,600 on a 900-square-foot pour, because the additional concrete, reinforcement, and base preparation all increase proportionally.

How Does Demolition of an Existing Slab Affect the Price?

Removing an existing concrete slab adds $2 to $6 per square foot. For a 30x30 area, demolition and disposal alone run $1,800 to $5,400 depending on the thickness of the old slab and the haul distance to the nearest concrete recycler. A 4-inch slab breaks and loads faster than a 6-inch reinforced slab, which accounts for most of that range.

What Role Does Subgrade Preparation Play?

Subgrade work on the south shore of Greater New Orleans is more involved than in most U.S. markets. Soft alluvial clay and organic silt require over-excavation and 4 to 6 inches of compacted limestone base. That base material and compaction cost $1.50 to $3 per square foot. On a 900-square-foot slab, subgrade preparation adds $1,350 to $2,700 to the total.

How Does Reinforcement Change the Price?

Welded wire mesh (6x6 W1.4/W1.4) adds $0.50 to $1 per square foot. Number 3 rebar on 18-inch centers adds $1 to $2 per square foot. For a 30x30 slab, the difference between mesh and rebar reinforcement is $450 to $900. Rebar provides greater crack resistance on the expansive clay soils common in Jefferson and Orleans parishes.

How Does the Concrete Mix Affect Cost?

A standard 3,500 PSI mix for residential flatwork costs $140 to $165 per cubic yard delivered in the Greater New Orleans market in 2026. A 4,000 PSI mix for driveways or shop floors runs $155 to $180 per cubic yard. At 11 cubic yards for a 4-inch slab, the mix upgrade adds $165 to $330 to the total.

What Does the Finish Selection Add?

Finish selection drives $0 to $6 per square foot in additional cost. A broom finish is included in the base price. A stamped or exposed aggregate finish adds $4 to $8 per square foot. The full finish breakdown appears in the section below.

How Much Does a Concrete Slab Cost by Size?

Per-square-foot rates decrease as slab area increases because mobilization, forming, and finishing labor spread across more footage. The math for common sizes at 2026 Greater New Orleans rates:

• 20x20 slab (400 sq ft) at $9 to $16 per square foot: $3,600 to $6,400
• 24x24 slab (576 sq ft) at $8.50 to $15 per square foot: $5,000 to $8,600
• 30x30 slab (900 sq ft) at $8 to $18 per square foot: $7,200 to $16,200
• 30x40 slab (1,200 sq ft) at $8 to $17 per square foot: $9,600 to $20,400
• 40x60 slab (2,400 sq ft) at $8 to $15 per square foot: $19,200 to $36,000

A 10x10 slab (100 sq ft) runs $12 to $18 per square foot because the fixed costs of mobilization, forming, and concrete truck minimums compress into a small area. A 30x30 slab spreads those same fixed costs across 900 square feet, which is why the per-foot rate drops.

How Does the Finish Type Change the Cost of a 30x30 Slab?

Finish selection accounts for the largest single variable in the final price after slab thickness. The following ranges apply to a 900-square-foot pour in 2026:

• Broom finish: $8 to $12 per square foot ($7,200 to $10,800 total). Standard texture for driveways, walkways, and utility pads.
• Smooth trowel finish: $9 to $13 per square foot ($8,100 to $11,700 total). Used for garage floors and indoor slabs. Requires power troweling to close the surface.
• Exposed aggregate finish: $12 to $16 per square foot ($10,800 to $14,400 total). Aggregate is seeded or revealed by surface retarder and pressure wash within 12 to 24 hours of placement.
• Stamped concrete finish: $14 to $18 per square foot ($12,600 to $16,200 total). Includes color hardener, release agent, stamp pattern, and sealer. Stamped concrete requires resealing every 2 to 3 years in this climate.

What Is Included in a Contractor's Price for a 30x30 Slab?

A complete contractor bid for a 30x30 concrete slab covers seven items. Knowing what is included and what is not prevents surprise charges after work begins.

Three things typically included in a standard bid:

• Excavation to grade, subgrade compaction, and 4 to 6 inches of compacted limestone base
• Forming, reinforcement (mesh or rebar), concrete placement, finishing, and control joint cutting at 10-foot intervals
• Cleanup and form removal after the slab reaches initial set

Four items commonly excluded from a standard bid:

• Demolition and haul-off of an existing slab ($2 to $6 per square foot)
• Permits, where required by the parish ($75 to $300 in Jefferson Parish for a residential slab over 200 square feet, though property owners verify current fees with the Jefferson Parish Permits Office directly)
• Sealer application ($0.50 to $1.50 per square foot)
• Grading or drainage correction beyond the slab footprint ($500 to $2,000 depending on scope)

How Can a Homeowner Tell if a Concrete Slab Quote Is Fair?

A fair quote for a 30x30 concrete slab in Greater New Orleans falls between $8 and $14 per square foot for a standard broom-finish pour with proper base, reinforcement, and joint cutting. A bid significantly below $8 per square foot on the south shore warrants questions about three specific items.

A low bid often means one of three cost-saving shortcuts:

• A 3-inch slab instead of 4 inches, saving 3 cubic yards of concrete ($400 to $500 in material) but reducing load capacity by roughly 40%
• No compacted limestone base, pouring directly on native clay. On alluvial soils in Orleans and Jefferson parishes, this approach leads to settlement cracking within 2 to 5 years.
• No rebar or wire mesh. Unreinforced slabs crack at control joints as intended, but also crack randomly between joints, especially on the expansive clay common south of Lake Pontchartrain.

A reliable quote specifies slab thickness in inches, concrete PSI, base material and depth, reinforcement type, joint spacing, and finish. A bid that omits these details is incomplete, not competitive.

Where Do New Orleans Concrete Slab Prices Sit Against the National Range?

Greater New Orleans runs 10% to 20% above the national average for concrete flatwork. The national range for a standard 4-inch slab sits at $6 to $12 per square foot in 2026. New Orleans area pricing runs $8 to $14 per square foot for the same specification.

Three factors drive the premium. First, soft alluvial clay and organic silt across the south shore demand thicker imported limestone base, adding $1 to $2 per square foot compared to markets with stable sandy subgrade. Second, concrete delivery costs are higher because batch plants serve a metro area spread across narrow corridors between waterways, increasing truck time per yard. Third, the local labor market for experienced finishers remains tight, with hourly rates $3 to $5 above the Gulf Coast average. North shore jobs in St. Tammany Parish carry slightly lower subgrade costs because the sandy pine-flat soils drain naturally and require less imported base material, dropping the per-foot rate by $0.50 to $1.50 compared to a similar slab in Metairie or Chalmette.