Concrete Garage Floor Cost (2026): Replacement by Size

Garage floor cost

This Old House (April 2026) [1]:

$12 per square foot installed.
$1,200–$7,800 is what most homeowners spend on a full garage floor replacement.
About $4,500 on average for a standard two-car garage of 400–500 sq ft. The same page elsewhere puts that garage at $4,800–$6,000, which matches 400–500 sq ft at $12.

For a new slab rather than a replacement, This Old House gives $4–$8 per sq ft [2]. See concrete slab cost.

Cost by garage size

At $12 per square foot. Sizes are common examples; measure your own.

Garage	Size	Area	At $12/sq ft	Concrete at 4 in
One car	12 × 20 ft	240 sq ft	$2,880	2.96 cu yd
Two cars	20 × 20 ft	400 sq ft	$4,800	4.94 cu yd
Two cars	24 × 24 ft	576 sq ft	$6,910	7.11 cu yd
Three cars	32 × 24 ft	768 sq ft	$9,220	9.48 cu yd

Before you replace it

Cracks and wear on a sound floor can often be resurfaced for less; see resurfacing cost.
Thickness. Heavier vehicles need a thicker slab. Ask the contractor what they’ll pour and why.
Removal is part of a replacement quote. Check it’s listed.

Frequently asked questions

How much does a new 2-car garage floor cost?

This Old House puts a standard two-car garage (400–500 sq ft) at about $4,500 on average. At its $12 per sq ft, 400–500 sq ft works out to $4,800–$6,000.

Why is a garage floor more than a basic slab?

The $12 figure comes from This Old House's garage floor replacement guide, so it prices replacing an existing floor. The same publisher gives $4–$8 per sq ft for a new slab. Ask whether a quote includes breaking out and hauling the old floor.

How much concrete does a 24x24 garage floor need?

7.11 cubic yards at 4 inches thick, before waste, or 10.67 cubic yards at 6 inches.