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How much does a 24x24 garage slab cost in Winston-Salem?

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A 24x24 slab is 576 square feet, the standard two-car garage footprint, and in Winston-Salem, NC it prices differently from a patio of the same size because it is a structural pour. A garage slab carries vehicles and usually a building, so it runs thicker where it needs to, typically 4 inches in the field with thickened edges or footings where walls land, over a compacted stone base with a vapor barrier. The pour is the predictable part. The site work is the variable: how much cut and fill the spot needs, whether the soil compacts well, and access for concrete trucks. If a garage building is going on top, the slab spec should come from the building plans, and we price to those. Written price before any concrete is ordered.

Updated Aug 31, 2026 · Winston-Salem Concrete Co, Winston-Salem, NC

Concrete SlabsGarage & Basement Floors

Why a garage slab is not a big patio

Three upgrades separate a garage slab from a patio pour of the same footprint. Thickness where it matters: the field of the slab carries car tires, and the perimeter carries the building, so edges thicken or footings go in where walls land. A vapor barrier goes under the slab, because a garage floor with moisture rising through it stays damp, rusts what sits on it and fights any coating you ever apply. And the finish is a hard steel trowel rather than a broom, flat enough for a workbench and a floor jack.

Reinforcement earns its cost here more than on any patio. Wire or fiber in the mix, and cuts placed so the inevitable shrinkage cracking follows straight lines under the cars instead of wandering across the bay.

The site work sets the price

A 24x24 needs a level, compacted 576 square foot platform, and Piedmont lots rarely offer one for free. Cut on the high side, fill and compaction on the low side, and the fill has to be brought up in compacted lifts, not dumped and hoped over. Skimping here is how garage slabs crack at the door opening within a few years. Truck access matters too: 576 square feet at garage thickness is a multi-truck pour, and a spot the trucks cannot reach adds pumping to the bill.

Questions to settle before the pour

These decide the spec, and they are cheaper to answer before the concrete is ordered.

Common questions

How thick does a 24x24 garage slab need to be?⌄
Four inches in the field is standard for passenger vehicles, with thicker edges or footings where the structure lands. Heavier equipment or a lift changes the spec. The building plan governs when there is one, and the written estimate states the thickness so you can hold the pour to it.
Does a garage slab need footings in North Carolina?⌄
When a building sits on it, the walls need support below grade, either as separate footings or a thickened-edge monolithic slab. NC's frost line is 12 inches, shallower than northern states, which keeps footing depth reasonable here. The building plan and inspections decide the details.
Can you pour a garage slab over my existing gravel pad?⌄
Often, and it can save real money. Gravel that has been compacting under use for years is partway to being a proper base already. It still gets checked, graded and topped up, but you are not starting from bare clay, and that shows up in the price.

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