Irrigation System Bid Checklist for Small Contractors

The expensive irrigation mistake usually happens before the first trench is cut.

The customer asks for "sprinklers in the front and back." The contractor prices by zone count, head count, or a rough square-foot number. Everyone feels like the job is understood until the crew finds the real site conditions:

• the available flow will not support the head layout the customer approved;
• static pressure looks fine, but dynamic pressure drops too far when the system runs;
• the backflow device is missing, wrong, buried, untestable, or in the wrong place for the local rule;
• the driveway needs sleeves, but the quote only priced open lawn;
• spray heads are planned for narrow strips that should be drip or low-volume irrigation;
• the controller cannot handle watering restrictions, separate hydrozones, rain shutoff, or the customer's actual Wi-Fi setup;
• the closeout has no as-built, no controller schedule, no pressure readings, and no proof that each zone worked.

An irrigation bid has to sell more than pipe and heads. It has to explain how the system will deliver water to the right places, at the right pressure, under local rules, and within the customer's approved expectations.

That starts with a work request intake and site assessment checklist. It becomes a landscaping bid, landscaping quote, or landscaping proposal. After approval, it should turn into a field-ready landscaping work order, locate record, startup sheet, and closeout handoff.

If the bid is only a price, the job will be managed by memory. If the bid captures the design assumptions, the crew can build from the same facts the estimator sold.

First decide what kind of irrigation job this is

"Irrigation system" is too broad for a bid title.

The document should state the actual job type:

EPA's WaterSense guidance tells homeowners to look for irrigation pros who can design, install, maintain, repair, and audit systems. That is useful for small shops because each function produces a different document. A design bid needs assumptions and calculations. A repair work order needs field condition notes. An audit needs measurements, findings, and recommended corrections.

Use the landscaping contract agreement when the job is more than a same-day repair. Use a statement of work scope attachment when the irrigation work is part of a larger landscape, fence, hardscape, drainage, or lighting project. The scope attachment should say which trade owns each crossing, sleeve, trench, restoration, electrical outlet, controller location, and water connection.

Do not bid heads before pressure and flow

A sprinkler system is a pressure-and-flow job that happens to live in the landscape.

Before you promise coverage, record:

• water source and point of connection;
• meter size, service line, hose bib test limitations, and whether the test point represents the irrigation connection;
• static pressure;
• dynamic pressure at an actual flow rate;
• available gallons per minute for design, after accounting for a safe pressure margin;
• elevation change;
• backflow device type and pressure loss assumption;
• mainline, lateral, valve, fitting, filter, regulator, and emitter/head pressure needs;
• worst-case zone assumption;
• time of day when pressure was tested, especially where municipal pressure varies.

A bid that says "8-zone sprinkler system" without these assumptions is weak. The customer cannot compare two bids fairly if one contractor priced a system that will actually reach the heads and another priced a zone count.

Write the design assumptions directly in the landscaping bid:

Do not oversell precision from a weak test. A hose bib test may help screening, but it may not represent the meter, service line, pressure reducer, backflow device, or point where you will actually connect. If the pressure and flow are unknown, call the price preliminary and make final design conditional.

This is the same discipline as any hidden-condition job. If the field facts can change the price, the quote should say that before the customer signs. The workflow from Hidden Conditions and Scope Gaps applies to irrigation just as much as remodeling or plumbing.

Build zones around plants, sun, soil, slope, and equipment

Zones are not just pieces of a controller.

They are watering decisions.

A good bid should explain why turf, shrubs, trees, narrow strips, full-sun beds, shaded beds, slopes, and planters are not all being watered the same way. EPA's WaterSense watering guidance tells homeowners to group similar plants together in irrigation zones and account for sprinkler type, sun or shade exposure, and plant type. California's Model Water Efficient Landscape Ordinance uses the hydrozone idea in a more formal way: plants in a hydrozone have similar water and sun needs, and the irrigation plan should match the landscape plan.

That does not make California's ordinance a national rule. It does show a practical bidding habit that travels well:

Price irrigation by hydrozone logic, not by where the trench happens to be easiest.

On the site assessment checklist, record:

• turf areas by sun exposure and slope;
• plant beds by plant type and water need;
• narrow strips where spray may waste water on pavement;
• clay, sand, compacted fill, slopes, or low spots that affect cycle-and-soak scheduling;
• mature trees and root zones that should not be trenched casually;
• drainage paths, downspouts, low points, and runoff complaint areas;
• water window or municipal watering restrictions;
• owner expectations for lawn appearance versus water savings.

Then turn that into bid language:

EPA's Water Budget Tool is not a field scheduling calculator, and EPA says local real-time weather data is more appropriate for scheduling. But the tool is useful for bid thinking because it forces the designer to look by zone, plant water need, irrigation method, and local climate instead of treating the whole yard as one lawn.

Backflow belongs in the bid, not as an afterthought

Any irrigation system connected to potable water can create a cross-connection issue. The exact backflow device, test requirement, installation location, permit path, and recurring reporting rule depend on the state, utility, plumbing code, and local cross-connection program.

The bid should not say only "includes backflow."

It should answer:

Texas is a useful example of why this cannot be a vague line. TCEQ's landscape irrigation rules and publications point contractors to 30 TAC Chapter 344, which includes licensing, backflow prevention and cross-connections, design and installation standards, completion requirements, maintenance rules, contracts, and warranties. A shop outside Texas should follow its own state and utility rules, but the bid habit is the same: name the authority and device path before the trench starts.

For annual tests, failed results, repairs, retests, tags, and utility submittals, use the workflow in Backflow Test Reports: How Plumbing Shops Handle Utility Submittals. For new irrigation installs, the plumbing inspection report or plumbing service report can carry the backflow condition record if your landscaping paperwork does not have enough room.

Trenching, sleeves, roots, and private utilities need their own lines

Customers see sprinklers.

Crews see trench routes.

The bid should separate irrigation installation from site work that changes labor:

• trenching through open soil;
• boring or sleeving under sidewalks, driveways, patios, and walks;
• cutting and patching hardscape;
• root-heavy areas around trees and hedges;
• rocky soil, irrigation in planter boxes, retaining walls, raised beds, or tight side yards;
• valve box placement and access;
• restoration of sod, mulch, gravel, edging, pavers, or decorative stone;
• disposal of old pipe, valves, and heads;
• repairs to private lighting, dog fence, drainage, old irrigation, pool, septic, low-voltage, or owner-installed lines.

Before digging, the job should use the utility locate photo log. 811 marks may not cover every private line on the property. Irrigation work is full of private conflicts: low-voltage lighting, invisible pet fence, abandoned sprinkler lines, pool lines, shallow drainage, septic components, landscape lighting, gate wiring, and owner-installed conduit.

Write the boundary:

Price includes one-call locate request for the marked excavation area and customer-provided disclosure of known private utilities. Private utility locating, repairs to unmarked private lines, rock excavation, root pruning, hardscape cutting/patching, and trenching outside the approved route are excluded unless listed.

That sentence does not excuse careless digging. It tells the customer what your price includes and what needs a separate change order if the field changes.

Controller choices should match the site, not the sales pitch

"Smart controller included" is not enough.

EPA's WaterSense weather-based controller page says these controllers use local weather data and landscape conditions to tailor watering amount, frequency, and timing. EPA also says WaterSense labeled weather-based controllers must meet plant needs without overwatering and are independently certified. EPA's soil moisture-based controller page describes a different approach: sensors measure moisture in the ground and can bypass scheduled irrigation when plants do not need water.

Those are useful tools. They are not magic.

The bid should specify:

Use careful language:

Install WaterSense labeled weather-based controller sized for listed station count. Includes initial programming by hydrozone, rain/freeze sensor setup where listed, customer orientation, and written baseline schedule. Customer-provided Wi-Fi, app account, future watering-restriction changes, and seasonal adjustments after the initial setup are excluded unless listed in the maintenance plan.

For soil moisture sensors, write where the sensor goes, which zones it controls, how the threshold is set, and what happens if the sensor fails or is disconnected. EPA's specification discussion emphasizes function, precision, response to soil moisture changes, and supplemental features. Your bid should not promise "never overwater again" because a sensor still depends on placement, wiring, setup, soil condition, and maintenance.

Pressure-regulated heads and efficient devices need real scope

EPA's spray sprinkler body guidance says high pressure can cause excessive flow, misting, fogging, and uneven coverage, and WaterSense labeled spray sprinkler bodies use integral pressure regulation to help keep flow consistent at the nozzle. EPA also estimates that an average household using 50,500 gallons outdoors and operating at or above 60 psi can save nearly 5,600 gallons per year by installing labeled spray sprinkler bodies.

That number is useful, but only under the stated conditions. Do not turn it into a universal savings promise.

In the bid, use product choices as scope:

For each option, the quote should say whether it is base scope, alternate, upgrade, rebate-dependent, or customer-declined. If a customer chooses the cheaper option, the signed bid should preserve that decision.

Water efficiency can sell the job, but the paperwork should sell it honestly:

• "pressure-regulated spray bodies included on listed spray zones";
• "drip conversion included for foundation beds only";
• "controller rebate application assistance excluded";
• "water savings depend on pressure, schedule, weather, plant material, maintenance, and customer settings."

Commissioning is where the bid proves itself

The system is not complete when the last valve box lid goes on.

It is complete when the shop can prove the installed system matches the approved scope and can be operated by the owner.

The Irrigation Association and American Society of Irrigation Consultants' Landscape Irrigation Best Management Practices distinguish inspection from commissioning. The same document says commissioning can include observing zones, using catch devices to determine precipitation rate and distribution uniformity where required, recording meter readings, operating drip zones, taking pressure readings, verifying sensors and controller wiring, taking station ohm readings, verifying the irrigation map against controller settings, reviewing cycle-and-soak times, and preparing reports with findings and deficiencies.

That is a lot for a small residential job. You do not need to sell a full audit on every repair. But a new system or meaningful retrofit should include a closeout level that matches the price and risk.

For small jobs, the completion sign-off should include:

• zone count and zone descriptions;
• pressure or flow readings where measured;
• controller make/model and station map;
• baseline watering schedule;
• sensor setup;
• backflow device record and test/submittal status where applicable;
• photos of point of connection, valve boxes, controller, backflow, sleeves, and final restoration;
• customer training notes;
• warranty period and maintenance responsibilities;
• known exclusions or customer-declined recommendations.

For larger jobs, add a daily report log, as-built sketch, commissioning report, and owner manual. If the irrigation work was done under a GC, HOA, property manager, or permit process, use a construction submittal form or construction transmittal for the closeout packet.

Price the maintenance handoff

Irrigation systems drift.

Heads get kicked. Nozzles clog. Mulch covers emitters. Shrubs grow into spray patterns. Customers change controller schedules after the app sends a notification. Watering restrictions change. A new fence, dog run, patio, lighting line, or tree planting disturbs the route.

So the bid should say what happens after startup.

Tie that to the landscaping work order and final service note:

Customer received station map, controller schedule, backflow record, and maintenance checklist. Zone 3 drip filter should be cleaned monthly during active watering season. First adjustment visit included within 30 days. Changes caused by new planting, sod establishment, customer schedule edits, freeze damage, mower damage, or third-party construction are excluded unless approved by change order.

That kind of closeout note is plain.

It is also what keeps a one-time install from becoming unpaid maintenance.

A one-page irrigation bid checklist

For a small irrigation or landscape shop, the bid can stay practical.

Use this structure:

The point is not to make irrigation bidding slow.

The point is to stop selling a system you have not described.

If the landscaping bid says how the system will work, what assumptions it depends on, what local rules it must satisfy, how the controller will be set, and what proof the customer receives at closeout, the crew can build from a real plan instead of a promise.

Sources

• US EPA WaterSense, Weather-Based Irrigation Controllers
• US EPA WaterSense, Soil Moisture-Based Irrigation Controllers
• US EPA WaterSense, Spray Sprinkler Bodies
• US EPA WaterSense, Water Budget Tool
• US EPA WaterSense, Water Budget Approach
• US EPA WaterSense, Irrigation with a Pro
• US EPA WaterSense, Watering Tips
• Irrigation Association and American Society of Irrigation Consultants, Landscape Irrigation Best Management Practices
• Irrigation Association, Irrigation Audit Guidelines
• Texas Commission on Environmental Quality, Landscape Irrigation Rules and Publications
• California Natural Resources Agency, Model Water Efficient Landscape Ordinance
• California Department of Water Resources, Model Water Efficient Landscape Ordinance Guidebook
• Common Ground Alliance, Best Practices online guide, for white-lining, positive response, locate verification, and excavation documentation habits
• Virginia 811, Private Utilities Explained, as one state 811 example explaining where utility-member marking can stop and why private/customer-owned lines may not be marked
• Kentucky 811, Private Utilities & Locators, as another state 811 example noting that sprinkler, lighting, pool, and other owner-side lines may require private locating