Short answer: approve an irrigation installation quote only after it names the 811 locate process, zone layout, water pressure assumptions, controller, backflow prevention, trenching depth, permits, pressure testing, winterization needs, and lawn restoration scope.
An irrigation system is a plumbing, electrical, landscaping, and excavation project in one package. A price that only lists heads and pipe can miss the work that keeps the system legal, efficient, and repairable.
Call 811 guidance tells homeowners and contractors to contact the local one-call center before digging so buried utilities can be marked. EPA WaterSense guidance encourages efficient outdoor water use and weather-based irrigation controllers. The quote should reflect both: safe digging and smart water control.
Require 811 And Utility Marking Details
The estimate should state who requests the 811 locate, when it happens, how long marks remain valid, and what happens if work is delayed. It should also say whether private lines such as lighting, invisible fences, pool lines, drainage, or homeowner-installed utilities are excluded from public marking.
If the contractor says “we always call,” ask for it in writing. Utility damage can be expensive and dangerous.
Check Zone Design And Coverage
The quote should include a zone map or written design showing lawns, beds, slopes, sun exposure, soil conditions, spray heads, rotors, drip lines, valves, and controller stations. Ask how head spacing, matched precipitation, overspray, and runoff will be handled.
Do not approve a quote that treats the whole yard as one watering area when different zones need different watering times.
Confirm Controller And WaterSense Options
Ask whether the controller is a basic timer, weather-based controller, soil-moisture-based controller, or WaterSense labeled model. The quote should include setup, programming, rain sensor or weather signal details, and homeowner training.
If a rebate is mentioned, ask for the exact controller model and program paperwork before relying on the savings.
Clarify Backflow, Permits, And Testing
Irrigation systems often require backflow prevention to protect drinking water. The quote should identify the device, permit responsibility, inspection, annual testing requirements if applicable, and whether a licensed plumber is needed.
After installation, the contractor should pressure-test the system, adjust heads, check leaks, demonstrate zones, and provide a shutoff and winterization explanation.
Irrigation Quote Review Table
| Quote area | What to confirm | Why it matters |
|---|---|---|
| Digging | 811 ticket, private utility exclusions, trenching plan | Buried line damage can stop the job and create liability. |
| Design | Zone map, head spacing, drip areas, slope and shade | Watering quality depends on layout, not head count. |
| Controls | Controller type, rain sensor, weather-based scheduling | Efficient control reduces waste and runoff. |
| Water safety | Backflow preventer, permit, inspection, testing | Local rules may require specific devices and records. |
| Closeout | Pressure test, head adjustment, yard repair, training | The system should work and the yard should be restored. |
Questions To Ask Before Digging
- Who contacts 811 and manages the locate schedule?
- Are private utilities or drainage lines included in locating?
- Can I see the zone map before approval?
- What heads, rotors, drip lines, and valves are included?
- Is the controller WaterSense labeled or rebate eligible?
- What backflow device is included, and who handles inspection?
- How deep will trenches be, and how will the lawn be restored?
- Will the system be pressure-tested and adjusted before final payment?
- Is winterization or first-season adjustment included?
Red Flags In An Irrigation Estimate
- No one is clearly responsible for 811 utility marking.
- The quote lists parts but no zone plan.
- Backflow prevention is missing or vaguely described.
- The controller is named only as “smart timer” with no model or setup scope.
- Yard restoration is excluded but not priced.
- No final pressure test or head adjustment is included.
Quote check: irrigation installation starts underground. Before digging, the quote should prove utilities, water safety, watering design, and yard restoration are under control.
Source Links
- Call 811: Know What’s Below
- EPA WaterSense: WaterSense Labeled Controllers
- EPA WaterSense: Outdoors
- OSHA: Trenching and Excavation
- FTC: How to Avoid a Home Improvement Scam
FAQ
Who should call 811 before irrigation installation?
The quote should state who is responsible. Many contractors handle it, but the responsibility and timing should be written before digging starts.
Does 811 mark every underground line?
No. Public utility marking may not cover private lines such as lighting, drainage, pool lines, or homeowner-installed utilities. Ask how private lines will be handled.
Should a sprinkler quote include a zone map?
Yes. A zone map helps verify coverage, controller stations, valve locations, and areas that need drip or different watering schedules.
What is a WaterSense labeled controller?
It is an irrigation controller that meets EPA WaterSense criteria for weather-based or soil-moisture-based watering efficiency. Ask for the exact model if a rebate is claimed.
Should lawn repair be included?
Only if the quote says so. Trenching can disturb turf, mulch, edging, and beds, so restoration should be listed clearly.