Pouring concrete is a weekend project you can do yourself if the patio is small and level

A concrete patio is poured in layers: you build a frame, prepare the ground beneath it, mix and pour the concrete, then finish the surface while it is still wet. The whole job takes one to three days depending on size, and most of the time is waiting for concrete to cure between steps. You will need a few tools you may already own (a shovel, a level, a wheelbarrow) and a few you will rent (a concrete mixer, or you can order ready-mix concrete delivered). The hardest part is not the pouring—it is keeping the concrete level and smooth while it sets.

If your patio is larger than about 200 square feet, or if the ground slopes more than a few inches, or if you want a decorative finish, hire a concrete contractor. The cost difference is smaller than you think once you factor in tool rental, and a professional will finish faster and flatter. For a small, straightforward patio on level ground, this guide will walk you through the process.

Key Takeaways

  • You need to build a wooden frame (called a form) that holds the concrete in place while it sets, and this frame must be level or your patio will slope.
  • The ground under the concrete must be compacted and level; loose soil will settle later and crack the patio.
  • Concrete is heavy—a 4-inch-thick patio 10 feet by 12 feet weighs about 14,000 pounds, so plan how you will move it before you order.
  • You have roughly 30 to 60 minutes after pouring to smooth and finish the surface; after that, the concrete hardens and you cannot reshape it.
  • Concrete takes at least seven days to cure enough to walk on, and 28 days to reach full strength; you cannot use the patio during this time.

Measure the space and decide on thickness and depth

Measure the length and width of where you want the patio. Write down the square footage—you will need this to order concrete. A typical residential patio is 4 inches thick; this is thick enough to support foot traffic and resist frost heave in cold climates. If you live in a very cold area where the ground freezes deep, check with a local contractor about whether you need to go deeper or add a gravel base below the concrete.

The patio should slope slightly away from your house or any building—about 1/8 inch per foot—so water runs off instead of pooling. If your yard is already sloped, you may not need to add slope. If it is flat, you will build this slope into your form. Measure the height difference from one end of the patio to the other; if the patio is 12 feet long, a 1/8-inch-per-foot slope means the far end should be about 1.5 inches lower than the end near your house.

Build the wooden form and check it for level

The form is a rectangular frame made from 2-by-4 lumber (or 2-by-6 if your patio is thicker than 4 inches). Lay the boards on the ground where the patio edges will be. Drive wooden stakes into the ground on the outside of the frame, one stake every 4 feet, and nail the boards to the stakes. The stakes hold the boards in place while you pour. Make sure the boards are straight and the corners are square—use a tape measure to check that the diagonals are equal length.

Now check the form for level using a 4-foot level. Place the level on top of the boards and adjust the stakes until the form is level in one direction (perpendicular to the slope direction). Then place the level along the direction you want the slope—the direction water should run—and shim the stakes so the form slopes down 1/8 inch per foot. This is the most important step; if the form is not level or sloped correctly, your patio will be uneven or will pool water.

Once the form is set, drive a nail partway into the top of each stake so you can see the height of the form at a glance. This helps you keep the concrete level as you pour.

Prepare the ground and add a gravel base

Remove any grass, roots, or debris from inside the form. Dig out any soft spots or low areas so the ground is as level as possible. The ground does not have to be perfectly level—the concrete will bridge small dips—but large holes or soft spots will settle later and crack the patio.

Spread a 2- to 4-inch layer of gravel (crushed stone, not pea gravel) inside the form. Compact it with a hand tamper or a rented plate compactor. This layer lets water drain away from under the concrete instead of pooling, which prevents frost heave and extends the life of the patio. Wet the gravel lightly and tamp it again; it compacts better when slightly damp.

Order concrete and plan how you will move it

Calculate the volume of concrete you need: length × width × depth (in feet), then divide by 27 to get cubic yards. For example, a 10-by-12-foot patio that is 4 inches thick is 10 × 12 × 0.33 ÷ 27 = 1.5 cubic yards. Order a little extra—concrete is sold in half-yard increments, and it is better to have leftover than to run short.

You have two options: ready-mix concrete delivered by truck, or bags of concrete mix you combine with water yourself. Ready-mix is faster and less physical work, but the truck must be able to reach your patio—it needs a clear path and level ground. If your patio is in a backyard with a narrow gate, bags may be your only option. A cubic yard of concrete weighs about 3,600 pounds, so for the example above (1.5 cubic yards), you would need to move about 5,400 pounds of material. If you use bags, you will mix and pour many batches; plan for this to take most of a day.

Order the concrete for a day when the weather will be dry and the temperature will stay above 50°F for at least 24 hours after pouring. Concrete cures slower in cold weather and can be damaged by rain while it is still soft.

Pour the concrete and work it into the form

If using ready-mix, have the truck back as close as possible to the patio. If using bags, mix them in a concrete mixer (rent one for the day) or in a wheelbarrow with a shovel, following the bag instructions for water. Start pouring concrete into one corner of the form and work your way across. Do not dump it all in one spot; spread it as you go.

As you pour, use a shovel to work the concrete into the corners and edges of the form, especially around the stakes. This removes air pockets and makes the concrete denser. Do not overwork it—just enough to fill the form completely and remove large air bubbles. If you are using a mixer, keep it running and have someone feeding bags or water while someone else pours and works the concrete.

Pour until the concrete is slightly higher than the top of the form. You will screed (level) it down flush with the form in the next step.

Screed and smooth the surface while the concrete is wet

A screed is a straight board—usually a 2-by-4 or 2-by-6—that you drag across the top of the form to level the concrete. Lay the screed board across the top of the form at one end of the patio. With a helper, drag it toward you in a sawing motion, keeping it pressed down on the form. This levels the concrete and removes excess. Work your way across the patio in strips.

Once screeded, the surface will be rough. Smooth it with a wooden or magnesium float—a flat tool with a handle that you push and pull across the surface in overlapping strokes. Floating closes small holes and brings cream (fine particles) to the surface, which makes the concrete smoother and more durable. Float the surface once or twice; do not overwork it or it will become too soft and hard to finish.

If you want a non-slip surface, you can broom-finish it: drag a damp broom across the surface once the concrete is firm enough that the bristles do not sink in. This creates a textured surface that is safer to walk on when wet.

Let the concrete cure and protect it from rain and foot traffic

Concrete reaches initial set (hard enough to walk on lightly) in about 24 hours, but it is still curing and gaining strength. Do not walk on it or place anything on it for at least seven days. Full strength takes 28 days. During this time, keep the surface damp by misting it with water or covering it with plastic sheeting. This slows evaporation and helps the concrete cure evenly, which reduces cracking.

If rain is forecast within 24 hours of pouring, cover the patio with plastic sheeting weighted down at the edges. Rain can damage the surface while it is still soft. If the temperature drops below 50°F, cover it with blankets or straw to keep it warm; cold slows curing and can weaken the concrete.

Once the concrete has cured for seven days, you can remove the forms and walk on the patio. Wait the full 28 days before placing heavy furniture or equipment on it.

Frequently Asked Questions

What if I pour the concrete and it starts to rain?

Light rain within the first hour is usually not a problem—the concrete can absorb it. Heavy rain or rain after the concrete has started to set will damage the surface and create a weak, pitted finish. If rain is forecast, cover the patio with plastic sheeting weighted at the edges before you pour. Keep the covering on until the concrete has set (usually 24 hours).

Can I use concrete sealer to make the patio last longer?

Yes. After the concrete has cured for 28 days, you can explore a concrete sealer to protect it from water, salt, and staining. Sealer does not make concrete waterproof, but it slows water absorption and extends the life of the patio. Reapply sealer every two to three years, or as the manufacturer recommends.

What causes cracks in a new concrete patio?

Cracks usually come from uneven settling (soft ground underneath), rapid drying (pouring in hot sun without misting), or freezing before the concrete is fully cured. You can reduce cracking by compacting the ground well, keeping the concrete damp while it cures, and pouring when the temperature will stay above 50°F for at least a week.

Do I need to add rebar or wire mesh to the concrete?

For a patio on stable ground, rebar or mesh is not required, but it can help reduce cracking. If you add it, lay it in the middle of the concrete thickness—not on the ground or at the surface—so it actually reinforces the concrete. For a small residential patio, it is optional; for larger patios or if the ground is unstable, a contractor can advise whether it is worth adding.

How do I fix a patio that is cracked or uneven?

Small cracks (less than 1/8 inch wide) can be sealed with concrete crack filler to prevent water from getting in. Larger cracks or uneven sections usually require removing and replacing that section of concrete, which is a job for a contractor. Prevent problems by following the curing steps above and keeping the patio sealed.