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SlabCosts
Prices updated January 2026

Shed Base Concrete Slab Cost

What a shed base costs in 2026 — and how many bags if you're pouring it yourself.

Shed slab cost calculator

Preset to a typical shed at 10×12 @ 4". Adjust anything — cost updates live.

Waste & region

Order extra for spillage & uneven subgrade. 10% is typical.

Installed cost estimate

$660 – $1,440

120 sq ft · 1.63 yd³ concrete

Bags of concrete needed (rounded up)

74

80 lb

98

60 lb

118

50 lb

147

40 lb

Ready-mix (delivered)
$264 – $485
Bagged mix (80 lb, DIY)
$407 – $666
Installed by a pro
$660 – $1,440

Estimate only — not a quote. Bag counts are rounded up and include a 10% waste allowance.

Installed $660 – $1,440

Shed base sizes & cost

Size Concrete (4") Installed cost
8×8 · shed base 0.87 yd³ $352 – $768
8×10 · small shed 1.09 yd³ $440 – $960
10×10 · patio / shed 1.36 yd³ $550 – $1,200
10×12 · patio 1.63 yd³ $660 – $1,440
12×16 · large patio 2.61 yd³ $1,056 – $2,304
Building the whole thing? Follow the shed guide Base → rebar → pour → cost, chained step by step for your size.

You'll also need

Sized for this exact slab — tap any item to open its calculator with your measurements already filled in.

Gravel base

1.7 yd³

4" compacted base under the slab

≈ $51 – $111

Open calculator
Rebar

9 sticks

#4 bar, 18" grid (16 bars)

≈ $63 – $117

Open calculator
Bedding sand

0.37 yd³

~1" leveling layer

≈ $10 – $21

Open calculator

Shed base concrete slab cost

Shed pads are the friendliest slab to pour yourself: small enough for bags or a single small ready-mix load, and forgiving on finish since it's under a floor. The main decisions are size (match it to your shed footprint plus a small overhang) and whether to add a light rebar or mesh grid.

Popular sizes are 8×8, 10×10 and 10×12 — price yours below and use the base-gravel card to get a solid, well-drained pad.

Prices updated January 2026 National US averages · reviewed quarterly

Volumes use standard bag yields and a 10% waste allowance; costs are national US averages that vary by region, mix and finish. See our methodology for exactly how each figure is worked out, or check the reference sources:

Slab cost by project

Concrete Slab Cost Cost per sq ft + calculator Garage Slab Cost Typical 20×20 / 24×24 Driveway Slab Cost Concrete vs asphalt Patio Slab Cost 10×10 to 20×20 Shed Base Cost Small pads

Frequently asked questions

How much does a concrete slab for a shed cost?
A shed base is small, so it's cheap: a 10×12 slab runs about $650–$1,450 installed at 4" in 2026, and many people DIY it in bags or a small ready-mix load for a few hundred dollars in materials.
How thick should a shed slab be?
4" is plenty for a garden shed or workshop. Only go thicker if you'll store very heavy equipment or a vehicle.
Do I need a concrete base for a shed?
A concrete slab gives the most durable, level, pest-resistant base and doubles as the floor. Gravel or paver bases are cheaper alternatives for lighter sheds.
How many bags of concrete for a shed slab?
A 10×10 4" pad needs about 21 × 80 lb bags; a 10×12 needs about 25. The calculator gives the exact count for your size and every bag weight.