A 10x10 slab is 100 square feet, and that is garden shed territory. A base for a prefab shed, a greenhouse floor, a pad for trash cans or a generator. The square footage math takes ten seconds. Whether that math is the right price is the real question at this size.
The base math at example rates
| Finish | Example rate | 10x10 (100 sq ft) |
|---|---|---|
| Standard broom | $9 / sq ft | $900 |
| Colored | $12 / sq ft | $1,200 |
These are example rates, not market prices. Yours have to cover your mix cost, your crew, and your overhead, and the calculator above will run this same size with any rate you care to test.
Why 100 square feet runs into the minimum
Here is the problem with $900. The crew that pours a 10x10 shows up with the same truck, the same forms, the same tools, and burns most of the same morning as a job three times this size. And 100 square feet at 4 inches is only about 1.2 yards of concrete (100 sq ft x 1/3 ft deep, divided by 27), which is short-load territory, and ready-mix suppliers charge extra for small loads.
That is exactly what a minimum job charge is for. If the per-foot math lands below your floor, you quote the floor. If you have not set one, read how to set a minimum job charge and pricing small jobs so they pay before the next shed pad call comes in.
What moves the number off the base math
Tear-out is the big one. Breaking out an old cracked pad at the example add-on of $4 per square foot adds $400 to this job. Site prep and grading at the example $2 per square foot adds $200. Wire mesh at the example $1.50 per square foot is another $150, and it is cheap insurance even under a shed.
Thickness matters too. Four inches carries a shed fine. If a truck tire or a loaded trailer will ever sit on this pad, pour it thicker and price the extra concrete in.
Price other sizes in seconds
The concrete slab cost calculator runs any length and width against the same example rates, so you can sanity-check a 12x12 or a 12x16 just as fast.
A shed-pad price is only right if it is built on your numbers. PriceDesk puts this calculator on your phone with your rates and your minimum charge, free for 14 days.