DIY Irrigation System for Lawn | Install Yourself for Under $100

You can install a DIY irrigation system for your lawn using off-the-shelf poly pipe, garden hoses, timers, and sprinklers, with hose-end kits costing under $100 and full underground setups averaging around $2,539 for small, flat lawns.

Keeping a lawn green through July without spending Saturdays wrestling hoses takes planning. A DIY irrigation system handles the work on a timer you set once, and the whole thing is cheaper than most people expect. The route you pick — hose-end or buried — depends on your yard’s size and how much trenching you want to do.

Hose-End Kits: The Cheapest Way to Start

A hose-end system costs under $100 and installs in an afternoon. You connect a timer to the spigot, run a standard 5/8-inch garden hose to each zone, and attach sprinklers with Quick-Snap connectors. The whole setup sits above ground and stores away in winter.

Orbit makes a large-size timer built for hose connections; pair it with a brass splitter so you still have a spare port for a second hose. Quick-Snap connectors and shut-off valves run $3–$5 each at any Home Depot. This approach covers small, flat lawns without digging a single trench.

Underground Kits: The Permanent Choice

For larger lawns, an underground poly-pipe system costs $0.20–$1.00 per square foot and takes a weekend to install. The pipe is flexible 1-inch polyethylene. Supply lines run 6–12 inches deep — shallow enough to dodge frost but deep enough for sprinkler heads to retract fully.

Parts are off-the-shelf at Lowe’s and irrigation supply stores. No subscription required unless you add a smart controller.

How to Plan Your Layout

Measure the lot and sketch every tree, driveway, and slope. A sprinkler head covers about a 10-foot radius, so mark locations with flags and space them so coverage overlaps — gaps mean brown spots. Use string line and marking spray paint to draw the trench routes.

Check your water pressure before you buy anything. The system needs 40–60 PSI. Use a pressure gauge on the spigot and do a bucket test for flow rate (gallons per minute). If pressure drops when the washing machine runs, test with all other faucets off.

How To Install the Underground System

Step 1: Dig the Trenches

Dig 6–12 inches deep. A square-edge garden spade works for small yards; rent a trencher if you have more than a couple hundred feet of line. The depth matters in freeze zones — too shallow and the pipe ruptures in winter.

Step 2: Connect to the Water Supply

Two options here. For a hose-end tap, attach hose adapters to the outdoor faucet, install the Orbit timer, run the garden hose, and snap on the Quick-Snap connector. For a buried service line, shut off the house water, cut one inch of the copper or PVC line, and install a compression tee fitting with its own valve so the irrigation system runs independently of the house.

Some localities require a licensed plumber for service-line connections. Call 811 before you dig to mark buried utilities.

Step 3: Run the Poly Pipe and Attach Heads

Lay the 1-inch poly pipe in the trench. Connect swing pipe elbows (threaded top for the sprinkler, flex pipe bottom) to the main line. Use swing pipe tees to continue flow past each head. Close each zone with a compression end cap.

Step 4: Flush and Test Before You Backfill

Turn the water on and open each valve one at a time. Let the water run until it’s clear — dirt inside the pipe will clog the sprinkler heads. Do not backfill until every zone passes. A channel-lock pliers squeeze on any drips, and Teflon tape on every threaded fitting keeps dirt out.

Programming the Timer

Set the Orbit timer to water at 6 a.m. for one hour, every four days. Grass gets 10 minutes per station; drip zones get less. Adjust each sprinkler’s rotation arc (90 to 360 degrees) using the hollow arrow for direction and the solid arrow for arc width. Adjust one head fully before moving to the next.

For tech-friendly setups, smart controllers like Irrigreen run through an iOS or Android app with no manual programming. The Irrigreen heads plug directly into the main control box and pair over Wi-Fi.

Mistakes That Waste Time and Water

• Skipping the overlap. A 10-foot radius means heads spaced 10 feet apart leave dry spots. Overlap by a few feet.
• Backfilling too soon. Dirt in the pipe means taking every head apart to clean it. Flush first.
• Installing heads without testing the arc. Test the 90–360 range on the ground before you bury anything.
• Omitting Teflon tape. Unsealed fittings let dirt in and water out. Wrap every threaded connection.

Lawn Irrigation System: What Decides Your Total Cost

Two numbers matter: the size of the lawn and the route you choose. Hose-end stays under $100 for anyone. Underground kits climb with square footage, and smart controllers add $100–$300. The gate for a permanent system is frost — trenches in cold climates must sit deep enough that the pipe doesn’t freeze and the heads retract completely below the mower blade.

If you’re ready to skip the research and pick the right setup now, check out our tested recommendations for a do it yourself garden irrigation system that matches your yard size and budget.

Finish With a Watering Schedule That Works

Water early — 6 a.m. is ideal — so the grass dries before evening, cutting the risk of fungus. Adjust the schedule for rain by skipping a cycle when the ground is already wet.