Concrete Slab Cost Per Square Foot (2026): $6–$12

A concrete slab costs $6 to $12 per square foot installed in 2026, including material, labor, forming, equipment, and finishing. A simple thin slab for a shed can be at the low end; a thick, reinforced slab for a garage or workshop is at the high end.

Cost breakdown

• Basic 4-inch slab (shed, patio base): $6-$8 per sq ft.
• 5-6 inch reinforced slab (garage, driveway, workshop): $8-$12 per sq ft.
• Thickened edges, footings, or a monolithic slab: $10-$15 per sq ft.
• Site prep (grading, gravel base, vapor barrier): $1-$3 per sq ft.
• Small slabs under ~200 sq ft: expect a higher per-foot rate and often a minimum charge of $800-$1,500.

What actually drives the price

Thickness and reinforcement are the primary drivers, followed by site prep: a slab on flat, stable, well-drained ground is far cheaper than one needing excavation, fill, compaction, and drainage. Access for the truck or pump, finish type, and whether footings or a stem wall are part of the pour also move the number. Small pours carry a minimum because mobilization cost is fixed.

Price the prep, not just the pour

Homeowners think of a slab as 'just concrete,' but excavation, base gravel, compaction, forming, and a vapor barrier are often half the job. A photo of the site and a note on how the ground drains tells you whether this is a simple pour or a prep-heavy one.

What to ask for in slab photos

Ask for photos of the area from two corners, the slope of the ground (a level or a straightedge in the shot helps), any existing slab or gravel to remove, the path a truck or pump would take, and nearby downspouts or low spots. Ask what the slab is for, since a shed base and a garage floor need different thickness and reinforcement. With those answers Fast Snap Pro prices the prep and the pour separately from your own rates, so the customer sees why the number is more than "just concrete." See also the concrete patio cost guide and driveway paving cost guide.

Example: a 24 × 24 ft garage slab

Line item	How it's priced	Example
Excavate and grade	576 sq ft × $1.25	$720
4" compacted gravel base and vapor barrier	576 sq ft × $1.50	$864
Forms and thickened edges	96 linear ft × $9	$864
5" slab with rebar, trowel finish	576 sq ft × $7.50	$4,320
Pump truck (limited access)	Flat	$650
Total		$7,418 (about $12.90/sq ft)

Illustrative numbers only. Confirm thickness and footing requirements with local code.

To order concrete, multiply length × width × thickness in feet and divide by 27 for cubic yards: 24 × 24 × 0.42 ÷ 27 ≈ 9 yards, plus 5-10% for waste and thickened edges.

Frequently asked questions

How much does a concrete slab cost per square foot in 2026?

$6 to $12 installed for most slabs, including material, labor, forming, and finishing. Thicker or reinforced slabs run $10 to $15.

Why do small slabs cost more per square foot?

Mobilization, forming, and finishing costs are largely fixed, so a 100-square-foot slab spreads them over less area — expect a minimum charge of $800 to $1,500.

What's included in a slab quote?

Typically excavation and grading, a compacted gravel base, a vapor barrier, forming, the concrete, reinforcement, the pour, and finishing. Confirm which of these are in a given bid.

Can a slab be quoted from photos?

A range can, from photos of the site and dimensions; final pricing needs a visit to check grade, soil, and drainage.

How much concrete do I need for a slab?

Length × width × thickness (all in feet) ÷ 27 gives cubic yards. A 10 × 10 ft slab at 4 inches is about 1.25 yards before waste.

Do I need rebar in a concrete slab?

Thin patio or shed slabs sometimes use wire mesh or fiber only. Garage floors, driveways and slabs on poor soil typically get rebar to control cracking and carry heavier loads.

Give faster ballpark numbers

Try Fast Snap Pro to turn customer photos into a starting price range built on your own rates, before you schedule the in-person walkthrough.