Vapor Barrier (6-mil Polyethylene)
$0.35-0.50/sq ft
Best for: Garages, basements, slab-on-grade interiors, epoxy-ready slabs
Prevents ground moisture, efflorescence, flooring damage, and epoxy delamination.
Slab estimator · 2026
Concrete Slab Cost Calculator 2026: Per Sq Ft by Project Type
Calculate concrete slab cost by project type, size, thickness, vapor barrier, insulation, reinforcement, finish, state pricing, and DIY vs contractor mode.
Concrete slab cost 2026 quick reference
| Project type | Thickness | Cost/sq ft | Typical total |
|---|---|---|---|
| Shed foundation | 4 in | $6-10 | $600-4,800 |
| Patio | 4 in | $6-12 | $1,000-6,000 |
| Garage floor | 4-6 in | $6-12 | $2,400-6,900 |
| RV pad | 6 in | $8-14 | $1,200-8,400 |
| Driveway | 4-5 in | $6-15 | $2,400-13,000 |
| Mobile home slab | 6 in | $6-12 | $3,600-19,200 |
| House foundation | 6-8 in | $6-14 | $12,000-28,000 |
Prices include concrete, reinforcement, and labor. Excludes epoxy coating, stamped finish, demolition, and site prep. National 2026 averages vary about 20% by state.
Quick start project types
Cost structure
Concrete materialsReady-mix volume x state price
Structural attachmentsRebar, mesh, vapor barrier, insulation
Forms and jointsPerimeter forms plus joint layout
Surface finishBroom, smooth, exposed, stamped, epoxy
LaborBase hours plus structure and finish multipliers
OtherEquipment, disposal, permits, markup
Step 1: Project type
Garage Floor · 3500 PSI · Rebar #4 @ 18 in OC · ACI 360R. Vapor barrier required to prevent moisture. 4,000 PSI is recommended for heavy vehicles.
Step 2: Dimensions
Area: 576 sq ft
Step 3: Slab thickness
Volume: 7.82 yd3 with waste.
Step 4: Structural options
Garages, RV pads, driveways, and heavier residential slabs.
Step 5: Surface finish
Step 6: Location and mode
Results
Garage Floor · 576 sq ft · 4 in
Contractor total
$5,195$9/sq ft
DIY total
$2,424$4/sq ft
DIY saves
$2,77153% vs contractor
Panel A: Concrete materials
Ready-mix 3500 PSI7.82 yd3 with waste at $150/yd3
$1,173Rebar #4 @ 18 in OC576 sq ft reinforcement basis
$507WWR add-onNot selected
$0Vapor barrier6-mil polyethylene at $0.40/sq ft
$230Rigid insulationNot selected
$0Forms and joints48 lin ft estimated joints
$79Finish and sealerBroom finish; sealer included
$230Subtotal materialsConcrete, structure, forms, joints, finish, and sealer
$2,220Panel B: Labor
Labor rate
$57/hrState-adjusted or local override
Total hours
28.8 hrsBase hours plus structural and finish factors
Site prep and forming7.2 hrs · $410
Vapor barrier install2.9 hrs · $164
Rebar placement5.8 hrs · $328
Concrete placement7.2 hrs · $410
Finishing5.2 hrs · $295
Curing and cleanup2.0 hrs · $115
Subtotal laborContractor mode labor estimate
$1,642Panel C: Equipment
Concrete vibratorDaily rental baseline
$55Power screed / floatDaily rental baseline
$95Concrete sawJoint cutting rental
$75Finish tool add-onsStamped or epoxy equipment allowance
$0Subtotal equipmentContractor equipment basis
$225Panel D: Other costs
PermitFoundation and mobile home slabs include permit allowance
$0Waste disposal$0.12/sq ft cleanup and disposal
$69Subtotal otherPermit plus disposal
$69Panel E: Total cost summary
| Category | DIY | Contractor |
|---|---|---|
| Materials | $2,220 | $2,220 |
| Labor | $0 | $1,642 |
| Equipment | $135 | $225 |
| Other | $69 | $69 |
| Markup | $0 | $1,039 |
| Total | $2,424 | $5,195 |
Panel F: Optional upgrades
Add epoxy floor coating (2-coat)New contractor total: $9,519 · $17/sq ft
$4,325Add metallic epoxyNew contractor total: $13,147 · $23/sq ft
$7,952Panel G: Project notes
Project type: Garage Floor (ACI 360R)
Vapor barrier required to prevent moisture. 4,000 PSI is recommended for heavy vehicles.
Consider 4,000 PSI for heavy trucks or SUVs, and keep the vapor barrier on if epoxy may be added later.
Cold-climate note: use air-entrained concrete for freeze-thaw durability.
Concrete Slab Structural Options: What You Need & Why
Rigid Insulation (2 in EPS, R-10)
$1.00-1.50/sq ft
Best for: Heated slabs, house foundations, mobile homes, cold-climate work
Reduces heat loss and helps control frost-related movement under the slab.
Rebar vs Wire Mesh vs Fiber
$0.38-1.20/sq ft or $8/yd3
Best for: Match the reinforcement to load: mesh for light duty, #4 rebar for vehicles, tight spacing for structural slabs.
Fiber improves crack resistance but does not replace rebar for structural applications.
Epoxy Floor Coating
$3-7/sq ft standard, $7-12/sq ft metallic
Best for: Garage floors, workshops, and slabs needing stain resistance
Concrete should cure 28 days before coating; vapor barrier reduces delamination risk.
Concrete Slab Cost by Size 2026 — Quick Reference
4 inches thick · 3,000 PSI · broom finish · rebar · national average. Rows marked with * are the most searched sizes.
| Size | Sq ft | Volume | DIY cost | Contractor | Per sq ft |
|---|---|---|---|---|---|
| 5x5 | 25 | 0.15 yd3 | $150-200 | $150-300 | $6-12 |
| 10x10 | 100 | 0.62 yd3 | $350-500 | $600-1,200 | $6-12 |
| 12x12 | 144 | 0.89 yd3 | $480-680 | $860-1,700 | $6-12 |
| 10x20 * | 200 | 1.23 yd3 | $650-900 | $1,200-2,400 | $6-12 |
| 20x20 * | 400 | 2.47 yd3 | $1,100-1,600 | $2,400-4,800 | $6-12 |
| 24x24 * | 576 | 3.56 yd3 | $1,500-2,200 | $3,500-6,900 | $6-12 |
| 20x30 | 600 | 3.70 yd3 | $1,600-2,300 | $3,600-7,200 | $6-12 |
| 30x30 * | 900 | 5.56 yd3 | $2,300-3,300 | $5,400-10,800 | $6-12 |
| 40x40 | 1,600 | 9.88 yd3 | $3,800-5,500 | $9,600-19,200 | $6-12 |
| 40x60 | 2,400 | 14.81 yd3 | $5,500-8,000 | $14,400-28,800 | $6-12 |
| 50x50 | 2,500 | 15.43 yd3 | $5,700-8,200 | $15,000-30,000 | $6-12 |
| 40x80 | 3,200 | 19.75 yd3 | $7,200-10,400 | $19,200-38,400 | $6-12 |
Concrete Slab Cost FAQ
How much does a concrete slab cost per square foot in 2026?+
A standard concrete slab costs $6-12 per square foot installed by a contractor in 2026, or $2-4/sq ft for DIY materials only. This covers 4 inch, 3,000 PSI concrete with reinforcement and broom finish. Stamped concrete, epoxy coating, vapor barrier, insulation, and state labor rates can move the total higher.
How much does it cost to pour a concrete slab?+
Common contractor-installed examples in 2026: 10x10 ft is about $600-1,200, 20x20 ft is $2,400-4,800, a 24x24 garage slab is $3,500-6,900, and a 30x30 slab is $5,400-10,800. DIY often saves 40-55% on simple non-structural slabs.
How much does a garage floor concrete slab cost?+
A 2-car garage floor at 24x24 ft, or 576 sq ft, costs about $3,500-6,900 installed in 2026, or $1,500-2,200 DIY. Recommended specs are 4 inches thick, 3,500-4,000 PSI, rebar #4 at 18 inches on center, and a vapor barrier.
Do I need a vapor barrier under a concrete slab?+
Use a vapor barrier for most interior slabs, including garages, basements, heated slabs, and house foundations. It prevents ground moisture from moving into the slab and damaging flooring, epoxy coatings, or stored items. Outdoor patios, RV pads, and unheated shed bases often do not need one.
How much does a concrete shed foundation cost?+
A concrete shed foundation generally costs $600-4,800 installed depending on size. A 10x10 slab is about $600-1,200, a 12x16 slab is about $1,150-2,300, and a 16x20 slab is about $1,900-3,800. Small sheds may not need reinforcement; larger or heavier sheds should use mesh or rebar.
How much does an epoxy garage floor cost?+
Epoxy garage floor coating costs about $3-7/sq ft for a standard two-coat system or $7-12/sq ft for metallic epoxy. For a 24x24 ft garage, standard epoxy adds roughly $1,700-4,000 installed. Concrete should cure at least 28 days before epoxy application.
What thickness should a concrete slab be?+
Use 4 inches for patios, shed bases, walkways, and light-duty garage floors; 5 inches for heavier residential use; 6 inches for RV pads, mobile home slabs, and heavy vehicle areas; and 8 inches for structural foundation slabs. Each extra inch adds about 25% to concrete volume and material cost.
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