Concrete Pad Cost Estimator: Equipment Pads, AC Pads & Shed Pads (2026)

You need a small concrete pad for an AC unit, a generator, a hot tub, or a shed — and you are trying to figure out if you are about to spend $300 or $3,000. The answer depends almost entirely on size, because small pads get hammered by minimum charges that make the per-square-foot cost feel absurd.

A concrete pad is a slab. The math is identical. But pads are usually small enough that the delivery and labor minimums dominate the price, not the concrete itself. Here is how to estimate the real cost and avoid the most common budget traps.

2026 Concrete Pad Cost by Size

For anything under about 100 square feet, the concrete material is almost irrelevant — it is the labor minimum and delivery fees that set the floor price.

The Small Pad Problem: Minimum Charges

Here is why a tiny 3×3 AC pad costs $300+ even though the concrete itself is worth about $20:

1. Contractor minimums. Most concrete crews will not show up for less than $300–$500. They have to drive, set up, form, pour, finish, and clean up regardless of size.

2. Short-load fees. If you order less than about 3 cubic yards of ready-mix, the supplier charges a surcharge of $50 to $150 for the half-empty truck.

3. Forming labor. A small pad still needs clean forms, a level base, and careful finishing. The forming takes roughly the same time whether the pad is 3×3 or 6×6.

For pads under about 1 cubic yard, bagged concrete mixed on site is usually the smarter play. You avoid the short-load fee entirely, and a 3×3 pad only needs about 5 or 6 bags of 80-lb mix.

Thickness and Reinforcement by Use

Not all pads are 4 inches thick. What sits on the pad dictates the spec:

A filled hot tub can weigh 4,000 to 6,000 pounds. If you pour the standard 4-inch pad, it will crack. Use 6 inches minimum with 4,000 PSI and rebar on 12-inch centers. The extra concrete costs maybe $100 more in material — not worth gambling on.

DIY vs Hiring a Crew

For pads under about 50 square feet, DIY with bagged concrete is very realistic:

The trade-off is effort. Mixing 80-lb bags by hand is hard work, but for a small AC pad it is only 5–6 bags. For anything over about 1 cubic yard (45+ bags), call a crew — your back will thank you.

How to Estimate Your Pad Cost

1. Measure — length, width, and required thickness.
2. Calculate volume — use the slab cost calculator.
3. Decide bags vs ready-mix — under 1 yard, bags usually win. Over 1 yard, call for ready-mix.
4. Check reinforcement needs — wire mesh for light loads, rebar for heavy.
5. Factor in minimums — contractor minimum + short-load fee if using ready-mix.
6. Combine jobs — batch multiple pads into one pour to cut fees.

Run your numbers through the concrete cost estimator to get a baseline, then adjust for your specific site conditions. These are 2026 national averages — always get written quotes from local contractors.