How To Install an In-Ground Sprinkler System

An in-ground sprinkler system can simplify lawn care by delivering consistent, targeted watering across your yard. While the components are relatively straightforward, how you plan and install the system has a major impact on its performance over time.

We’ll walk you through the installation process step by step, with practical tips to help you manage water pressure, lay out zones effectively, and avoid common issues that can affect coverage and efficiency. Our guide also includes advice from experts, including This Old House landscape contractor Roger Cook.

Plan Your Layout and Zones

Before you can begin your own DIY project, you need a plan. Many manufacturers will custom-design a system specific to your yard and region, providing a layout and materials list to guide installation.

Even with a pre-designed plan, it’s important to understand how the system is organized. Sprinklers are divided into zones based on water pressure, flow rate, and the layout of your yard. Zone valves control each of these sections, opening and closing based on the timer so different areas can be watered independently depending on sun exposure, plant type, and water demand.

As shown in the This Old House segment “How to Install an Automatic Sprinkler System,” sprinkler installer Ken Moura explains that system performance depends on matching each zone to your available flow. If flow is limited, you may need to reduce the number of sprinkler heads per zone to maintain proper pressure and even coverage.

Pay close attention to how zones are grouped, especially in areas with different conditions across your yard. A well-planned layout helps ensure consistent watering and reduces the need for adjustments later.

Check Your Water Pressure and Flow

Before installing a sprinkler system, you’ll need to check your home’s water pressure and flow rate. Most systems require at least 30–35 pounds per square inch (psi) and about 10–13 gallons per minute to operate effectively. These measurements determine how many sprinkler heads you can run at once. If pressure or flow is too low, the system may produce weak spray patterns or uneven coverage.

In the same This Old House segment, sprinkler installer Ken Moura explains that even with good water pressure, limited flow may require reducing the number of sprinkler heads per zone to maintain proper performance.

Sprinkler System Installation in 10 Steps

Here’s a breakdown of the steps to install your own in-ground sprinkler system.

Step 1: In-Ground Sprinkler Overview

WARNING: Check with the local building department to obtain all necessary permits, and contact a one-call center to have the local utilities mark any buried electrical cables, gas lines, or sewer lines.

Step 2: Dig the Trenches

• Locate the pipe for the water source that you’ll be tapping into. It might be at the water meter in the basement or buried underground.
• Mark the locations of all the trenches and sprinklers with wooden stakes or plastic flags.
• Then use a gas-powered trenching machine to excavate the trenches to a depth of 4 to 12 inches, depending on the recommendation for your area of the country.

Tip: Most rental dealers will drop off and pick up the trenching machine for a small additional charge.

Step 3: Make the Water Connection

• Turn off the water to the house at the meter.
• Cut into the main water line and splice in a tee fitting with PVC cement and primer. If the line is copper, solder on a copper tee.
• Glue a 90-degree PVC elbow onto a male PVC adapter.
• Thread the adapter into the tee fitting installed on the main water line. It’s okay to connect PVC to copper here.

Tip: This is one of the most critical parts of the installation, since improper connections can lead to leaks or long-term damage. If you’re unsure about cutting into the main line, consider hiring a licensed plumber for this step. Cook says this is also the point at which you should install a dedicated shut-off valve for the sprinkler line, so you can service or repair the system later without shutting off water to the entire house.

Step 4: Install the Zone Valves

• Dig a trench from the main water line to the valve box location, as indicated on your plan. At the end, dig a hole about 18 inches deep and 2 to 3 feet long.
• Line the hole with 2 inches of gravel, then set the valve box into it. The box lid should be flush with the grass.
• Next, following the manufacturer’s directions, glue together the manifold and attach the zone valves. Set the manifold in the valve box.
• Run 1-inch schedule 40 PVC pipe from the main water line to a backflow-prevention device and then connect it to the manifold.
• Dig a shallow trench from the valve box to the location for the timer, according to your plan.
• Lay the 24-volt underground wire in the trench and connect it to the wires leading from each valve.

Step 5: Place the Pipes in the Trenches

• Following the plan, lay PVC pipe in all the trenches leading from the valve box. If necessary, join pipe sections with couplings and PVC cement.
• Wherever a pipe branches off to a sprinkler head, splice in tee fittings, then attach a short length of flexible piping, which will connect to the sprinkler head.
• Where a pipe connects to drip-irrigation tubing, attach an upturned elbow, a short vertical pipe, and a pressure reducer with a microfilter.

Tip: Keep pipe runs as direct as possible to maintain consistent water pressure. Extra bends or long runs can reduce flow and affect coverage. It’s also worth double-checking sprinkler placement at this stage, since making adjustments now is much easier than after the system is buried.

Step 6: Connect the Pipe at the Valve Box

• Use 90-degree elbows to join the PVC water pipes in the trenches to the zone valve pipes protruding from the valve box.
• Once the piping is completed, turn on the water to flush any dirt or debris from the system. Turn the water off again to install the sprinklers.

Tip: Flushing the system before installing sprinkler heads helps clear out dirt and debris from the pipes. Skipping this step can lead to clogged nozzles or reduced performance once the system is running.

Step 7: Install the Pop-Up Sprinklers

• Attach a pop-up sprinkler onto the end of each length of flexible piping. Push the barbed fitting all the way into the pipe; no glue or hose clamp is needed.
• Remove the cap from the sprinkler and install the appropriate spray nozzle, as indicated on the plan.

Tip: Flexible pipe connections make it easier to fine-tune the position and height of each sprinkler head. Taking time to align heads properly at this stage helps ensure even coverage and prevents overspray onto walkways or driveways.

Step 8: Roll Out the Irrigation

• At flowerbeds and trees, connect drip-irrigation tubing to the pressure reducer and microfilter coming from the underground PVC pipes.
• Roll out the tubing along the flower bed, keeping it close to the base of the plants.
• Keep unwinding the spool back and forth throughout the flower bed; space the tubing 12 inches apart.
• If necessary, join one length of tubing to another with a push-in coupling.
• When you get to the end of the layout, cut the tubing with a utility knife if necessary, flush it with water, fold it over, and slip on an end clamp.

Tip: Letting the tubing sit in the sun makes it more flexible and easier to work with. As you lay it out, keep lines close to the base of plants to deliver water directly to the roots, which improves efficiency and reduces waste from evaporation or runoff

Step 9: Install the Ground Stakes

• Once all the irrigation tubing is laid out, secure it with plastic ground stakes. Hook each stake over the tubing and press it into the dirt .
• Space the stakes about 18 to 24 inches apart.
• Note that it’s often necessary to place two stakes very close together and on opposite sides of the tubing to hold it down.
• To prevent the water coming out of the drip-irrigation tubing from evaporating too quickly—and to help hide the tubing—cover the area with bark mulch. Spread it at least 4 inches deep and it will also deter weeds from sprouting.

Tip: Securing the tubing properly helps prevent it from shifting over time, which can affect water distribution. In areas with loose soil or foot traffic, adding extra stakes can help keep lines in place.

Step 10: Connect the Timer Wires

• Mount the programmable timer on the house wall.
• Strip the insulation from the ends of the 24-volt wires that lead from the zone valves to the timer.
• Attach the wires to the timer terminals, as shown in the manufacturer’s instructions.
• Hire a licensed electrician to run power to the timer, if necessary.
• Set the timer and run a test to make sure that each zone and all the sprinklers are operating properly.
• Finally, adjust any nozzles that are spraying off course.

Tip: Securing the tubing properly helps prevent it from shifting over time, which can affect water distribution. In areas with loose soil or foot traffic, adding extra stakes can help keep lines in place.

Ready to bring your lawn to the next level? Check out some of our favorite lawn care resources.

• TruGreen Lawn Care Review
• How to Restore a Lawn Full of Weeds
• The Ins and Outs of Hydroseeding
• Summer Lawn Care Tips

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