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Concrete Slab Foundation Cost Guide 2026

Monolithic concrete slab foundation for house, garage, or addition

National Average Cost

$5,000 - $20,000

or $5 - $12 per square foot

Cost by Project Size

Typical costs for common concrete slab foundation sizes

Garage (20x20)
400 sq ft
$3,400
average
Small House (30x40)
1200 sq ft
$10,200
average
Medium House (40x60)
2400 sq ft
$20,400
average

Material & Labor Breakdown

Materials50%
Labor50%

Additional costs may include:

  • Grading
  • Vapor barrier
  • Insulation
  • Termite treatment

Cost Factors

Standard slab$5-$8/sq ft
Slab with footings+$2-$4/sq ft
Radiant floor heating+$6-$10/sq ft
Poor soil (extra prep)+20-40%
Sloped site (excavation)+$3,000-$10,000

Ways to Save on Your Concrete Slab Foundation

  • 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 Walkway / Sidewalk

$800 - $2,500

Concrete Garage Floor

$2,000 - $7,000

Concrete Detached Garage Slab

$3,000 - $8,000

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