Concrete · updated 2026
Shed Foundation Cost Calculator
A shed foundation can be a concrete slab, gravel pad, concrete piers, or skids on a prepared base. Enter the shed size, compare the four material quantities and costs, and use the recommendation note as a planning prompt. Type rates are TBD — verify with local suppliers, site conditions, and code requirements.
Use the main concrete calculator for broader concrete quantity estimates.
TBD — verify concrete scope
TBD — verify concrete scope
TBD — verify locally
TBD — verify locally
TBD — verify locally
TBD — verify locally
TBD — verify locally
TBD — verify locally
Show the math
Slab yards = length × width × 4 in ÷ 12 ÷ 27
Gravel = length × width × 6 in ÷ 12 ÷ 27 × 1.4 tons/yd³ = 3.11 tons
Piers = ceil(2 × (length + width) ÷ 4) = 11; skids = max(2, ceil(length ÷ 4)) = 3
Each foundation row applies its entered TBD rate to its quantity
Four foundation options
A shed may use a slab, gravel pad, piers, or skids on a prepared base. The right choice depends on shed weight, floor framing, soil, drainage, frost, anchoring, access, and whether you want a finished floor.
This calculator compares planning quantities. It does not select a structural system or replace the shed manufacturer’s support requirements.
How to use the comparison
Choose a preset or enter custom dimensions, select the foundation type you are considering, and enter local rates for each row. The comparison table still shows all four types so you can discuss the same footprint.
Rates are TBD — verify. Delivery, excavation, edging, compaction, concrete minimums, and disposal may be separate.
Gravel pad and slab
The gravel calculation uses the entered depth and 1.4 tons per cubic yard as a planning density. A real pad also needs a prepared subgrade, drainage plan, edging, and compaction.
The slab calculation uses a 4-inch planning thickness and concrete cubic yards. Thickness, reinforcement, finish, site prep, and access can change the scope substantially.
Piers and skids
Piers use a four-foot perimeter spacing planning rule in this calculator. Floor framing, soil, frost depth, and the shed manufacturer can require a different support grid.
Skids need a stable, level base and appropriate anchoring. The calculator reports a minimum planning count rather than certifying a foundation design.
Methodology and assumptions
Slab volume uses 4 inches; gravel uses entered depth and 1.4 tons per cubic yard; piers use ceil(2 × perimeter ÷ 4); skids use max(2, ceil(length ÷ 4)). All type rates are editable and TBD — verify.
What the numbers mean
The calculator converts your measurements into a practical purchase quantity using a documented coverage or spacing assumption.
Any whole-unit quantity is rounded up so the result does not leave you short during the project.
Use the cost range as a planning baseline and confirm the final quantity, availability, and delivery charge with your local supplier.
2026 material prices
| Material | 2026 average price | Note |
|---|---|---|
| Ready-mix concrete | $140.00 – $180.00 / cubic yard | Verified Wave 1 Batch 3 planning range; delivery varies |
| Drainage gravel | $40.00 – $60.00 / ton | Verified Wave 1 Batch 1 planning range |
| 80-lb concrete mix bag | $6.47 – $7.58 / bag | Verified Sep 2026 planning range |
Material, labor, coverage, density, and installation rates are TBD — verify with your local supplier, manufacturer, or contractor. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- A gravel pad needs excavation, fabric where appropriate, edging, and compaction—not just loose stone on grass.
- A slab can be useful as a finished floor but may be more foundation than a light shed needs.
- Piers and skids depend on soil, frost, drainage, anchoring, and the shed’s floor framing.
- Leveling and drainage are foundation work; do not hide them under a material-only estimate.
- Check the shed manufacturer’s support points and local setback or permit rules.
- Rates are planning inputs; verify delivery minimums, concrete short-load fees, and site access.
Common questions
Frequently asked questions
How much does a shed foundation cost?
The range depends on size and type: a gravel pad is often the lower-cost starting point, while a concrete slab is often more expensive. Exact 2026 type costs are TBD — verify; enter local rates for a 10×12 comparison.
What is the cheapest shed foundation?
A prepared gravel pad often wins for a light shed, while skids on a suitable base can also be economical. Soil, drainage, frost, anchoring, shed weight, and local requirements decide whether the cheapest option is appropriate.
Do I need a concrete slab for a shed?
Not for most light sheds. Gravel pads, piers, or skids may work when designed and prepared correctly. A slab can make sense for a heavy shed, workshop, vehicle use, or a desired finished floor.
How deep should a gravel shed pad be?
Four to six inches of compacted gravel over a suitable prepared base is a common planning range. Soft soil, drainage, frost, and the shed load can require a different section; verify locally.
Can I put a shed directly on the ground?
It may sit there temporarily, but direct ground contact encourages rot, settlement, and drainage problems. A prepared gravel pad, piers, or skids creates separation and a more stable base.
How many concrete piers for a 10×12 shed?
This calculator uses a perimeter spacing planning rule: ceil(2 × (10 + 12) ÷ 4) = 11 piers. Actual support grids can require a different count based on floor framing, soil, frost, and the shed manufacturer.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.