Questions to Ask a Drainage Contractor Before You Hire

The one thing these questions are testing for

You are not really interviewing a contractor about drainage. You are testing whether they diagnosed your specific yard or reached for the product they install most. Drainage fails far more often from a wrong diagnosis than from bad digging — the right system in the wrong place still doesn't work. Every question below is designed to reveal which kind of contractor you're talking to.

The questions that matter most

1. "What did you observe on my property that points to this fix?"

Why it matters: this is the whole game. A good answer references something specific about your yard — where water collects, how long it stays, the soil, the slope, where the downspouts go. A weak answer describes the product ("French drains are the best solution") without connecting it to anything they saw.

Good: "Your yard stays saturated in the back corner two days after rain, and the ground falls away toward the fence, so a French drain to that low edge makes sense." Evasive: "This is what we install for drainage problems like yours."

2. "Where exactly will the water discharge, and is that point lower than the drain?"

Why it matters: every drain that moves water needs a real outlet lower than itself. A contractor who can't point to a specific discharge location hasn't finished designing the system — and a drain with nowhere to go just relocates the puddle.

Good: names a spot — a ditch, a daylight edge, a dry well — that they've looked at. Evasive: "It'll drain away" or "into the yard."

3. "What's the fall from the wet area to that outlet?"

Why it matters: gravity drainage needs slope, about 1% at minimum. A contractor who has measured the fall has designed the system; one who estimates it by eye is guessing at the one number that decides whether it works.

Good: an actual measurement. Evasive: "There's enough" without having checked.

4. "Did you look at my downspouts?"

Why it matters: roof water is the most common single cause of a wet yard and the cheapest to fix. A contractor who ignored the downspouts and jumped to a buried system may be selling you an expensive fix for a cheap problem.

5. "What will this not fix?"

Why it matters: an honest contractor will name a limit — what happens in the biggest storms, what the system won't handle. Someone who says it solves everything is either overselling or hasn't thought it through. A stated limit is a sign of competence, not weakness.

6. "What happens if it doesn't work?"

Why it matters: answers range from a real warranty to nothing. Better to know before you sign than after the next storm.

Practical vetting questions

Alongside the diagnostic ones, cover the basics:

• Are you licensed and insured for this work? Requirements vary by state, and insurance matters when someone is excavating near utilities.
• Can I see drainage references from a few years ago? Drainage fails slowly — an older job tells you more than a recent one.
• Who calls 811 for utility locating? Free and required in most places. A contractor who treats it as optional is a warning.
• Can I get the diagnosis in writing, separate from the price? A quote that names a product without naming the problem it solves is not a plan.
• What does the quote include and exclude? Restoration of turf, beds, and paving should be stated, not assumed.

Before you make the calls

Working out what you're seeing first makes every one of these questions sharper. Start with standing water in your yard, compare the options, or work through your yard's conditions — you'll recognise a sound answer when you hear one.

Related pages

• Who to call for yard drainage
• How to compare drainage quotes
• Standing water in your yard
• Compare every yard drainage option

FAQs

What is the most important question to ask a drainage contractor?+

"What did you observe on my property that points to this fix?" It tests whether they diagnosed your specific yard or reached for the product they install most. Drainage fails more from wrong diagnosis than bad installation, so a contractor who connects the solution to something they actually saw is worth far more than one quoting a product from a description.

How do I know if a drainage contractor is legitimate?+

Check licensing and insurance appropriate to your state, ask for drainage-specific references from jobs a few years old, and confirm they call 811 before digging. Beyond credentials, the strongest signal is whether they measure before quoting — fall checked, outlet identified, downspouts inspected. A contractor who does that is diagnosing, not just selling.

Should a drainage contractor visit before quoting?+

Yes. Drainage depends on grade, soil, and where water can discharge — none of which can be assessed remotely. A quote given over the phone, without anyone standing in the yard, isn't a diagnosis. A site visit that includes measuring the fall and finding the outlet is the minimum for a quote you can trust.

What should be included in a drainage quote?+

The contractor's name, a clear description of the problem and the proposed solution, total cost with a breakdown of labour and materials, the specific system and materials, what restoration is included, exclusions, timeline, and any warranty. Crucially, the diagnosis should be stated separately from the price so you can compare the reasoning, not just the number.

How many quotes should I get?+

At least two or three for anything beyond a few hundred dollars, and ask each for the diagnosis in writing. If they agree on the cause, the price comparison is meaningful. If they disagree on the cause, that tells you something more valuable than any price — it means the problem isn't obvious and deserves a closer look before you commit.

What is a red flag when hiring for drainage?+

Quoting without a site visit, no specific discharge point, an unwillingness to provide references, pressure to decide quickly, unusually low bids, large upfront payment demands (more than about 15%), and vague contract language allowing material substitutions. Above all, a solution named without a problem diagnosed is the clearest sign to keep looking.