Concrete Slab Cost Per Square Foot (2026)

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.

Scoping this job from photos

The visible factors — size, access, condition, and finish level — are usually enough for a first-pass range from a few photos and a short description of what the customer wants. A final walkthrough is still worth doing before a firm number, since what's behind walls, underground, or under a surface can't be seen in a photo. Fast Snap Pro lets a customer send photos and describe the job so you can return a realistic starting range before scheduling the on-site visit. See also the concrete patio cost guide and driveway paving cost guide.

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.

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.