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Concrete Detached Garage Slab Cost Guide 2026

Concrete slab for detached garage with footings and thickened edge

National Average Cost

$3,000 - $8,000

or $5 - $10 per square foot

Cost by Project Size

Typical costs for common concrete detached garage slab sizes

1-Car (12x20)
240 sq ft
$1,800
average
2-Car (24x24)
576 sq ft
$4,320
average
2-Car + Storage (24x30)
720 sq ft
$5,400
average
3-Car (30x40)
1200 sq ft
$9,000
average

Material & Labor Breakdown

Materials48%
Labor52%

Additional costs may include:

  • Footings
  • Thickened edge
  • Anchor bolts
  • Vapor barrier

Cost Factors

Basic slab on grade$5-$7/sq ft
Frost footings required+$2-$4/sq ft
Sloped site (retaining wall)+$3,000-$8,000

Ways to Save on Your Concrete Detached Garage Slab

  • 1
    Get multiple quotes from contractors (3-5 minimum)
  • 2
    Schedule work during off-season (winter for concrete)
  • 3
    Keep it simple - basic finishes cost less
  • 4
    Prepare site yourself to save on labor
  • 5
    Combine with neighbors for bulk pricing
  • 6
    Avoid rush orders - plan ahead

Local Pricing Variations

Prices vary significantly by location. Major metropolitan areas and coastal cities can cost 30-50% more than the national average.

Get local pricing with our calculator

Related Cost Guides

Concrete Driveway

$3,000 - $9,000

Concrete Patio

$1,500 - $6,000

Concrete Slab Foundation

$5,000 - $20,000

Concrete Walkway / Sidewalk

$800 - $2,500

Concrete Garage Floor

$2,000 - $7,000

All cost estimates are national averages for planning purposes only. Local costs vary based on labor rates, material availability, site conditions, and building codes. Get quotes from local contractors for accurate pricing.

Last updated: May 2026