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How much does a 20x30 concrete slab cost in Winston-Salem?

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A 20x30 slab is 600 square feet, and in Winston-Salem, NC it is the workhorse size: detached workshops, carports, RV and boat pads, and big entertaining patios all land near this footprint. At this size the economics flip from small-pad pricing: the fixed crew costs spread thin across 600 feet, so the per-foot rate is among the best you will see, and the questions that matter become what the slab has to carry and what the ground under it looks like. A furniture patio, an RV pad and a workshop floor at the same 20x30 are three different specs with three different prices. Tell us which one it is and the written estimate prices that slab, not a generic one.

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

Concrete SlabsRV & Boat Pads

Same footprint, three different slabs

What the slab carries decides the spec. A 20x30 entertaining patio is a 4 inch pour with a broom or decorative finish. An RV pad carries several tons on wheels parked in one spot for months, so it wants more thickness or reinforcement and a base compacted to match. A workshop floor is a garage-grade pour: vapor barrier, hard trowel finish, thickened edges if walls are coming. Pricing them the same would mean one of them is specified wrong.

This is the page where honesty about use matters most. Tell the estimator a patio and park a camper on it, and the slab was built for the wrong job. The spec conversation at the estimate visit is exactly this: what is the heaviest thing this slab will ever hold.

Six hundred square feet of Piedmont ground

At 20x30 the site preparation is a real earthworks task. The platform has to be level and compacted across its whole area, and most Winston-Salem yards big enough for this slab have grade to deal with. Expect cut on one side and built-up compacted fill on the other. Drainage planning matters at this scale too: 600 square feet of concrete sheds a lot of water somewhere, and where that water goes is designed before the pour, not discovered after. On truck access, a 20x30 at 4 inches is roughly seven and a half cubic yards, a full truck plus, and a location the truck cannot reach adds pumping.

What moves the quote at this size

The spread between 20x30 bids comes from a short list.

Common questions

Is a 20x30 slab cheaper per square foot than a smaller pour?⌄
Meaningfully, yes. Fixed crew and mobilization costs spread across 600 feet instead of 150, so the per-foot rate drops. It is the same reason we suggest pricing the full size you actually want in one pour rather than pouring small and extending later.
How thick should a slab for an RV pad be?⌄
Thicker or better reinforced than a patio, matched to the axle weight it will hold, over a base compacted for the load. Parked weight in one footprint for months is a harder duty than a car that comes and goes. The estimate prices the pad to the vehicle you actually own.
Do I need a permit for a 20x30 slab in Winston-Salem?⌄
The slab itself on your own property generally does not need a building permit under North Carolina's residential threshold. If a building is going on top, the building has its own permit path, and its plan drives the slab spec. Right-of-way rules only enter if the work touches the street.

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