Questions to Ask a Plumber
Questions to ask before hiring a plumber, covering licensing and insurance, how the price is calculated, written estimates, permits, parts and warranties, cleanup, and payment terms.
The questions
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Are you licensed, and can you give me your license number?
Why ask it
A number you can verify with your state or municipal board is different from a claim of being licensed. Requirements vary by location, and some places license the company while others license the individual, so ask which one the number belongs to.
Do you carry liability insurance and workers' compensation?
Why ask it
If an uninsured worker is injured in your home or a supply line fails and floods a floor, the exposure can land on you or your homeowner's policy. Ask for a certificate of insurance for anything larger than a service call.
How often do you do this particular job?
Why ask it
Plumbers specialize more than people expect: drain cleaning, water heaters, repiping, gas, and sewer line work all draw on different experience. Someone who does yours weekly will be faster and will have seen the way it goes wrong.
Do you charge hourly or a flat rate for the job?
Why ask it
Flat rate gives you a known price and rewards speed; hourly means a slow diagnosis is on your bill. Neither is wrong, but you cannot compare two quotes until you know which basis each is using.
Is there a call-out or diagnostic fee, and does it come off the bill if I hire you?
Why ask it
Many companies charge to send a van and credit it against the work; some do not. Ask before they arrive, since this is the most common surprise on a small invoice.
Can I have the estimate in writing, with parts and labor separated?
Why ask it
An itemized estimate is what lets you compare bids and question a markup. A verbal number, or a single lump sum with no breakdown, gives you nothing to hold anyone to later.
What would make this price go up once you've opened it up?
Why ask it
A good plumber will name the specific unknowns: corroded pipe behind the wall, a fitting that will not come apart, a shut-off valve that no longer holds. Someone who promises no surprises on a hidden system is guessing.
Who will actually be doing the work?
Why ask it
The person who quotes is often not the person who arrives, and the crew may include apprentices or subcontractors. Ask what supervision is in place and who is accountable if the work fails.
Does this job need a permit and an inspection?
Why ask it
Water heater replacements, repiping, gas work, and sewer line repairs commonly require permits. Unpermitted work can surface when you sell the house or when an insurer asks, and a plumber who suggests skipping it is telling you how they work.
What materials are you planning to use, and why those?
Why ask it
Ask them to compare the options rather than just name one. Pipe choice, valve quality, and fixture brands differ in cost, expected life, and what a future repair will involve, and a plumber who cannot explain the tradeoff has a default rather than a reason.
If I supply the fixture myself, will you install it, and does that affect the warranty?
Why ask it
Some plumbers decline customer-supplied parts, and some will install them but warrant only their labor. Settle this before the box is in your hallway.
How long do you warrant your labor, and what's the warranty on the parts?
Why ask it
These are two separate warranties and both matter, since a manufacturer covering a water heater for six years does not cover the hours to swap it. Ask what happens if a repair fails in month four.
When can you start, and how long will the water be off?
Why ask it
Time without water is the part that actually disrupts your household, and it is rarely mentioned in a quote. For a whole-house job, ask whether it will be off overnight.
How will you protect the floors, and what does cleanup include?
Why ask it
Drain work and pipe cutting are messy in ways people do not anticipate. Ask specifically whether cleanup covers drywall dust and cut-out material, and whether patching a wall or ceiling is included or is left for you to hire out.
Will you take the old unit and debris away?
Why ask it
Old water heaters, cast iron sections, and packaging have to go somewhere, and disposal fees are sometimes billed separately. Confirm it rather than discovering a water heater on your driveway.
How do you handle after-hours calls, and what's the rate?
Why ask it
Ask now, while nothing is leaking. You want to know whether there is real overnight coverage or an answering service, and what the multiplier is on evenings, weekends, and holidays.
When is payment due, and how much do you want up front?
Why ask it
A modest deposit for special-order parts is normal; a large payment before work starts is not. Be wary of cash-only requests with no invoice, since without a paper trail you have no warranty claim and no proof of payment.
Can you show me the problem before you fix it, and the finished work afterward?
Why ask it
Reasonable plumbers will point at the corroded fitting or run a camera down the line and let you look. Reluctance to show you either the fault or the repair is the clearest signal you will get.
What caused this, and what should I do so it doesn't happen again?
Why ask it
The answer might be water pressure, hard water, tree roots, grease, or a fixture at the end of its life, and each has a different preventive step. This question also separates the plumber who is diagnosing from the one who is only replacing parts.
Can you give me a couple of recent customers with similar jobs I could call?
Why ask it
Ask for jobs like yours rather than references in general, because a plumber with excellent reviews for faucet swaps may never have repiped a house. Established plumbers produce these easily.
Hiring a plumber
Practical guidance for the conversation itself
Before you call
- Find your main shut-off valve now and make sure it turns. This is the single most useful thing you can know in a plumbing emergency.
- Photograph the problem, including any water damage, before anything is touched. You may need it for an insurance claim.
- Note when it started, whether it is constant or intermittent, and whether it affects hot water, cold, or both. It shortens the diagnosis you are paying for.
- If water is actively running, shut it off at the valve or the main before you spend time on the phone.
Getting quotes you can compare
- For anything substantial, get three quotes and give each plumber the same description of the work.
- Check that each quote covers the same scope: permits, disposal, patching, and any fixture included or not.
- The middle quote is often the useful one. A bid well under the others usually excludes something that will reappear as a change order.
- Ask each of them what they would do if it were their own house. The reasoning tells you more than the number does.
Signals to slow down for
- Pressure to decide immediately, or a discount that expires today.
- No written estimate, or a refusal to itemize parts and labor.
- A large deposit requested before any work or materials.
- Advice to skip a permit on work that plainly requires one.
- Vagueness about license and insurance, or a company name that does not match the license.
- An immediate recommendation to replace an entire system without showing you why the repair will not hold.
Emergency versus scheduled work
- In an emergency you will pay a premium and you will not have time for three quotes. Get the leak stopped, then get a written quote for the permanent repair.
- It is reasonable to authorize a stop-gap fix now and take the larger job to bid later.
- Keep every invoice and the permit paperwork. Both matter for warranty claims and when you sell.
- If the job goes wrong, raise it with the company in writing before escalating. Licensing boards handle complaints, but they will ask whether you gave the plumber a chance to correct it.