What a Garage Concrete Slab Costs
A 576 sq ft garage concrete slab with rebar, a thickened edge and a vapor barrier costs $6,631 to $11,051 at national prices. Enter your garage's footprint and ZIP in the calculator for a local figure.
LIKELY INSTALLED PRICE
$8,841
Our installed range for this 24×24 ft, 4-inch slab: $6,631 – $11,051 ($11.51 – $19.19 per sq ft)
In plain terms: that's about the size of a two-car garage pad, and roughly 42% of the price is the crew's labor.
- DIY materials
- $3,430
- Concrete
- 7.11 yd³
- Bagged mix
- 353 80-lb bags
- Delivery
- 1 truck
An estimate, not a bid. A contractor's price depends on your site, access and timing.
What changes the price
Where the money goes
- Materials$4,239
- Labor$3,128
- Overhead and profit (20%)$1,473
All 11 line items
| Item | Qty | Material | Labor | Total |
|---|---|---|---|---|
| Site setup, layout and cleanup | 1 job | $100 | $56 | $156 |
| Excavate and grade subgrade | 576 sqft | $0 | $639 | $639 |
| Forms, stakes and form release | 96 lf | $115 | $213 | $328 |
| Compacted crushed-stone base | 9.96 ton | $448 | $184 | $632 |
| 6-mil polyethylene vapor barrier | 576 sqft | $76 | $43 | $119 |
| #4 rebar, tied on chairs | 816 lf | $814 | $362 | $1,176 |
| Thickened slab edge (12 in deep) | 96 lf | $864 | $426 | $1,290 |
| Ready-mix concrete, 3,500 psi, delivered | 7.47 yd3 | $1,299 | $166 | $1,465 |
| Place, screed and broom finish | 576 sqft | $29 | $746 | $775 |
| Sawn control joints | 96 lf | $144 | $71 | $215 |
| Street apron / curb cut tie-in | 1 ea | $350 | $222 | $572 |
| Subtotal × overhead and profit (20%) = midpoint | $8,841 | |||
National prices until you enter a ZIP.
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Compare a contractor's price with the range for these inputs.
What next
Get two or three quotes and compare them with $6,631 – $11,051. DIY: 353 bags or 7.47 yd³ of ready-mix.
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Turn this price into an estimate for your customer →Cost by thickness for 24x24 (576 sq ft)
4 in · patios, sheds
$6,631 – $11,051
7.11 yd³ · 353 bags · about $8,841
5 in · garages, driveways
$6,863 – $11,439
8.89 yd³ · 440 bags · about $9,151
6 in · shops, RV pads
$7,193 – $11,988
10.67 yd³ · 528 bags · about $9,591
What goes into a concrete garage slab
Beyond the flat floor, a garage slab has a thickened edge under the walls, a vapor barrier and an apron at the door. This one uses 7.11 yd³ of concrete and 816 linear ft of rebar. Each item has its own line in the table.
Garage concrete slab thickness
The default is 4 inches with rebar, which carries cars. Trucks, boat trailers and car lifts need more. Raise the thickness to see how the concrete and price change.
Concrete slab for a garage floor: slope and drainage
The floor should fall slightly toward the door so meltwater runs out. Floor drains need permits in some areas and must be placed before the pour. Tell the finisher where the high and low points go.
Self-leveling concrete for a garage floor
Self-leveling compound is a thin topping poured over an existing slab to fill low spots. It fixes an uneven surface, not a slab that is cracked or moving. A new slab is the fix when the base has failed.
Garage floor concrete leveling options
A sunken section can be raised by mudjacking or foam injection instead of being replaced. Grinding takes down high spots and ridges. Both cost less than a new floor when the slab is otherwise sound.
Estimate versus a builder's bid
Treat this figure as a planning estimate rather than a bid. Footings below frost depth, permits and anchor layouts are priced by the builder after a site visit.
DIY vs pro for this 24x24 pour
Materials alone come to $3,430, about 39% of the $8,841 midpoint contractor price. The difference is $5,411 of labor, equipment, delivery and contractor overhead across 11 line items. At 7.47 yd³ with waste the pour fills 1 mixer truck, so ready-mix is the practical route even for a DIY pour.
Related slab sizes
Compare with the next sizes
- Plain slab slab$4,848 – $8,080
- Slab foundation slab$17,216 – $28,693
- Driveway slab$6,234 – $10,390
- Patio slab$1,601 – $2,668
- Shed pad slab$1,074 – $1,790
Finishing the floor: epoxy and polished concrete costsAll slab sizes and the full calculator
Frequently asked questions
How thick should a garage slab be?
Many builders pour 4 to 5 inches for cars and 6 inches for heavy trucks or lifts. Local code may set a minimum.
Does a garage slab need a vapor barrier?
For storage or a heated garage, yes. It's included by default in this estimate.
Slab first or walls first?
With a monolithic slab, the floor and thickened edge are poured first and the walls bolt down to it. With stem walls, the walls go up first and the floor is poured inside.
How much concrete for a garage slab?
7.11 yd³ for this floor at 4 inches, or 7.47 yd³ ordered. That fills 1 truck.
For contractors
Quoting concrete for customers?
The free estimating app opens with a sample concrete job priced the same way. Read more about concrete estimating software.