Irrigation System Invoice Template — Free Download (2026)

Irrigation system installation costs in 2026 range from $2,000–$6,000 for a typical residential property, depending on yard size, zone count, head type, and controller. Average cost by zone count: 3–4 zones (small yard): $1,500–$2,800. 5–7 zones (medium yard): $2,500–$4,500. 8+ zones (large yard or estate): $4,000–$8,000+. Factors that affect cost: rotor heads (Hunter PGP, Rain Bird 5000) cost more than spray heads but cover more area per head. Smart controllers (Rachio, Rain Bird, Hunter Hydrawise) cost $150–$350 more than manual controllers but reduce water use by 20–50%. Drip irrigation zones for beds and garden areas cost more to install than spray zones per linear foot. Point of connection: tapping into existing main line is typically included; a new tap or significant run from the meter adds cost. Commercial systems for HOAs, sports fields, or commercial properties run $8,000–$50,000+ depending on acreage.

The number of irrigation zones depends on your yard size, the type of irrigation (rotors cover more area per head than spray heads), and water pressure. As a rule of thumb: 1 zone covers 1,500–3,000 sq ft with rotor heads, or 700–1,200 sq ft with spray heads. Calculate your total irrigated area and divide by the coverage per zone to estimate zone count. Separate zones are typically needed for: lawn areas (rotors) vs. garden beds (drip or spray — different water needs and precipitation rates, can't be mixed on the same zone efficiently); sunny vs. shady areas (different watering requirements); front vs. back yard (may run at different times); and slopes (to prevent runoff when other zones are at rest). A good irrigation contractor will design zones based on matched precipitation rates — all heads in a zone should put out the same amount of water per square foot to avoid over- or under-watering different parts of the same zone.

A backflow preventer is a device installed at the point where the irrigation system connects to the potable (drinking) water supply. It prevents water from the irrigation system (which may contain fertilizers, pesticides, or soil contamination) from flowing backward into the drinking water supply — which can happen during a pressure drop in the main line (water main break, fire suppression demand, etc.). Most municipalities require a backflow preventer on all irrigation systems connected to city water, and many require annual testing by a certified tester to verify it's functioning correctly. The most common residential irrigation backflow device is a Pressure Vacuum Breaker (PVB) — it must be installed at least 12 inches above the highest irrigation head. Commercial systems and higher-risk applications use a Reduced Pressure Zone (RPZ) assembly, which is more expensive but provides stronger protection. Skipping a backflow preventer to save money is illegal in most jurisdictions and creates liability for both the contractor and the property owner.

Irrigation systems should be winterized (blown out with compressed air to remove water from all pipes and heads) before the first hard freeze in your area. Pipes with water in them can freeze and crack, and irrigation heads can crack when water freezes inside the body. General timing guidelines by region: Northern states (MN, WI, ND, MT, CO — high altitude): mid-September to mid-October. Midwest (IL, IA, MI, OH): late October to mid-November. Mid-Atlantic (PA, NY, NJ): October to early November. Pacific Northwest (elevated): late October to November. South and Southwest: typically not required unless temperatures regularly drop below 20°F. Drip irrigation lines are particularly susceptible to freeze damage because the small-diameter tubing doesn't drain easily. A professional winterization (compressed air blowout, all zones) takes 30–60 minutes and typically costs $75–$150 — significantly less than repairing a cracked main line or replacing multiple heads in spring.

Rotor heads (also called rotary heads): rotate while spraying, covering a large radius (25–50+ feet). They put out water slowly (low precipitation rate — typically 0.5–1.5 inches per hour) over a wide arc. Best for large lawn areas. Common models: Hunter PGP, Rain Bird 5000, Toro T5. Spray heads (also called fixed heads or pop-up sprays): spray in a fixed pattern without rotating, covering a smaller radius (6–15 feet typically). Higher precipitation rate (1.5–2.5 inches per hour). Best for smaller lawn areas and beds. Common models: Rain Bird 1800 series, Hunter Pro-Spray, Toro 570Z. MP Rotators (hybrid): rotary nozzles on a spray head body. Cover 15–30 feet with very low precipitation rates (similar to rotors). Excellent for slopes, clay soils, or any situation where water needs time to soak in. Critical rule: never mix rotor heads and spray heads on the same zone. Their precipitation rates are completely different, which means one type will be significantly over- or under-watered if they run on the same schedule.