Investing thousands in an irrigation system feels risky if you don't understand what return you'll actually see. The gap between a cheap installation and a thoughtful ROI-focused system can mean the difference between water bills that spike and a landscape that thrives for 15+ years. Here's what to ask contractors before signing.
Water Savings: The Core ROI Driver
A quality irrigation system typically cuts water use by 30–50% compared to hand-watering or outdated sprinkler setups. Before hiring, ask your contractor for a water-use estimate based on your property size, soil type, and plant needs. Request comparisons showing your current monthly water bill versus projected costs after installation—not vague percentages, but actual dollar figures.
Most contractors can access your water history through municipal records or your past bills. If they won't do this homework, that's a red flag. Systems with smart controllers, soil moisture sensors, or weather-based scheduling can adjust watering automatically, pushing savings toward the higher end.
System Design Questions to Ask
Does the contractor propose a professional site assessment? Proper design takes 1–2 hours minimum. They should evaluate sun exposure, soil drainage, plant types across zones, and local water pressure. A $200–400 design fee upfront often saves $500+ in wasted water annually.
Are zones separated logically? Turf grass needs different watering than flower beds or shrubs. A well-zoned system prevents overwatering delicate plants while underserving thirsty grass. Ask how many zones they recommend and why.
What controller technology are they installing? Contractors typically offer three tiers:
- Basic timer ($150–300): Fixed schedules; no adjustments for rain or season
- Smart/WiFi controller ($400–800): App control, seasonal changes, and weather skip features
- Advanced sensor system ($800–1,500+): Soil moisture or rain sensors that interrupt watering automatically
The smart controller often pays for itself within 1–2 years through water savings alone.
Installation Costs and Timeline
Standard residential irrigation systems run $2,500–$6,000 installed, depending on lawn size (typically 5,000–10,000 sq. ft.) and complexity. Smaller urban lots might be $1,500–$3,000; larger estates can exceed $8,000. Ask for a line-item quote breaking down:
- Materials (heads, valves, controller, wire, tubing)
- Labor hours and rates
- Trenching or boring costs (especially if crossing hardscaping)
- Backflow prevention device (often required by code; $300–$600)
Installation usually takes 2–5 days for a typical residential property. Avoid contractors who rush; poor trenching leads to frozen pipes and root damage.
Warranty and Maintenance Expectations
Inquire about warranties on parts (typically 1–5 years) and labor (usually 1 year). Ask whether the contractor includes a spring startup and fall winterization in the first year—these are essential for system longevity in most climates.
A system that lasts 15 years with proper care is far better ROI than a cheap install that fails in 5. Request references from customers who've used the same contractor for 3+ years. That's a stronger signal than fresh reviews.
Hidden Costs to Clarify
Permits and inspections: Most municipalities require them ($50–$300). Confirm who pays and handles filing.
Water pressure testing: Some soils or municipal hookups require upgrades. Ask if they'll test and what additional costs might arise.
Landscape modifications: If trees need planting or soil regrading to match the design, clarify costs upfront.
Leverage Mercoly for Comparison
When comparing contractors, use platforms like Mercoly to view multiple irrigation service providers side-by-side with verified reviews and estimates. This helps you ask smarter questions of each contractor and spot inflated prices or missing services.
Frequently Asked Questions
Q: Will my water bill actually drop, or is that contractor sales talk? A: Yes—systems with proper zone design and smart controllers typically reduce water use 30–50%, translating to $30–$100+ monthly savings on average. Ask the contractor to show you water savings for homes similar in size and climate to yours.
Q: What's the difference between DIY kits and hiring a contractor? A: DIY kits ($500–$1,200) save labor costs but often fail due to poor design, wrong head selection, or undersized lines. Contractors charge more upfront but deliver systems that function reliably for 15 years and often qualify for municipal rebates (available only for licensed installs).
Q: How often does an irrigation system need maintenance? A: Professionally installed systems need spring startup, seasonal adjustments, and winterization once yearly—budget $200–$400 annually. Systems are designed for this routine; skipping it voids warranties and shortens lifespan.
Get three contractor quotes with detailed assessments and water-savings projections before deciding.