Concrete Slab Cost Calculator (2026)
By Dan Whitlock, Home Projects Editor · Updated July 2026
A concrete slab is the base for a shed, garage, patio, driveway, or room addition, and the price hinges on a few clear choices. In 2026, a standard 4-inch residential slab runs about $6 to $12 per square foot installed, so a typical 400-square-foot pour lands near $2,400 to $6,000. Area drives most of it, but thickness, whether you add wire mesh or rebar, and the finish (a plain broom finish versus decorative stamping) all move the number. Enter your slab size below to build an estimate, then read what shapes the cost.
Estimate your cost
Square feet of slab. A 1-car garage pad is ~240 sq ft; a 12x12 patio is 144 sq ft.
Added per square foot for the whole slab area shown above.
Labor and materials swing with local cost of living.
Estimated concrete slab cost
$2,500 – $5,200
Most homeowners pay around $3,400
Cost breakdown
- 400 × ~$8$3,200
- Wire mesh (standard)$200
Planning estimate based on 2026 national price data, not a quote. Get local quotes to confirm.
What drives your concrete slab cost
- Area: square footage is the biggest driver. More area means more concrete, forming, and finishing labor.
- Thickness: a 6-inch slab uses about 50% more concrete than a 4-inch slab and is required for driveways and heavy loads.
- Reinforcement: wire mesh is standard; switching to a rebar grid adds material and labor but resists cracking under load.
- Finish: a plain broom finish is cheapest; stamped, stained, or polished decorative finishes can add 50% or more.
- Site prep and access: grading, forming, sub-base gravel, and hard-to-reach pours all add to the base per-foot price.
Ready for real numbers?
A calculator gets you the fair range. Local quotes confirm it for your exact home. Comparing 2–3 written quotes from licensed local pros is the single best way to avoid overpaying: ask each for the same scope in writing so the numbers are comparable.
Ways to save
- Pour a simple rectangle: curves and odd shapes add forming labor and waste.
- Choose a broom finish over decorative stamping unless the slab is a visible living space.
- Right-size the thickness: 4 inches is plenty for patios and sheds; save 6-inch pours for driveways and garages.
- Combine multiple small pours into one job so the crew mobilizes and finishes once.
- Prep the sub-base or clear the area yourself where the contractor allows it.
Hire it out, or do it yourself?
Leave this one to a proA small shed pad (say, 8x10 feet) is a realistic weekend project for a homeowner comfortable with a level and a rented mixer. The scope is manageable: build a simple form, mix and pour, screed, float, and broom-finish before the concrete sets. The difficulty is the timing window between pour and finish, which shrinks fast in hot weather. Get that right on a small pad and the result holds up fine.
Anything structural or much larger than about 100 square feet is a different job. A garage floor, a room addition foundation, or a driveway involves a ready-mix truck, precise grading, rebar or wire mesh placement, and a finishing pass with a bull float before the concrete stiffens. There is no undo if the finish gets away from you. Pros work in crews for exactly this reason: one person can't pour and finish a large slab before the window closes.
The other hidden variable is sub-base preparation. The slab is only as good as the compacted gravel under it. A shallow, uneven, or soft sub-base is the most common cause of residential slab cracking, and it is entirely invisible once the concrete is poured. A professional crew grades and compacts the base, checks for drainage, and positions reinforcement before a drop of concrete goes down. For anything beyond a small garden structure, that experience is worth the per-square-foot premium.
Helpful products
Taking the DIY route, or doing part of the job yourself? These are the product categories most people buy for this project. As an Amazon Associate we may earn from qualifying purchases, and it never changes your price.
Frequently asked questions
How much does a concrete slab cost in 2026?
A standard 4-inch slab runs about $6 to $12 per square foot installed, with a national average near $8. A typical 400-square-foot slab lands around $2,400–$4,800 before decorative finishes or heavy reinforcement.
Does a concrete slab need rebar or wire mesh?
Most residential slabs use welded wire mesh, which is enough for patios and sheds. Driveways, garage floors, and slabs carrying heavy loads benefit from a rebar grid, which adds roughly $0.50–$1.50 per square foot.
How much more does a 6-inch slab cost than a 4-inch?
A 6-inch slab uses about 50% more concrete, so expect roughly 15–25% more overall. It’s the standard for driveways and anything supporting vehicles or heavy equipment.
How much does a stamped concrete finish add?
Stamped or stained decorative concrete can add 50% or more over a plain broom finish, often pushing the installed price into the $12–$18 per square foot range depending on the pattern and coloring.
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Price ranges cross-referenced against these 2026 cost guides and contractor databases:
A new slab needs about a month to cure fully: once it does, it is a candidate for an epoxy coating that keeps the surface looking clean and protects it from oil and wear.
Epoxy Garage Floor cost from $1,400 →