Questions to Ask a Plumber
Questions to ask a plumber before you hire one and while they are in the house. They are grouped by when you would ask them: on the first call, over the quote, during the work, about the warranty, in an emergency, and about looking after the pipes once the repair is done.
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The questions
Each question, and why to ask it
First call
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 a worker is hurt in your home or a fitting fails and floods a floor, the plumber's cover is what should pay, and without it the cost can come back to you or your own policy. Who has to carry workers' compensation or a bond differs by place, and a one-person shop may be exempt, so ask what applies to them and get a certificate 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, and some do not. An estimate for a big job such as a repipe may be free while a repair visit carries the fee, so find out which one your call counts as before anyone drives over.
How long have you been in business, and how much of that around here?
Why ask it
Years in the trade count, and years in your town count for more. A local plumber knows the water, the pipe that went into houses of your era and how the inspection office works, and is likely to still be around when a warranty question comes up.
Is this something you handle, or should I be calling a different trade?
Why ask it
Septic tanks, well pumps, gas lines and the sewer past your property line may each belong to a different specialist or to the utility, and the rules differ from place to place. A plumber worth hiring says so on the phone and saves you a wasted visit.
How soon can someone come out, and how wide is the arrival window?
Why ask it
A four-hour window means half a day off work, so ask whether they call or text when the van is on its way. For a slow drip, a firm appointment later in the week often beats a vague one tomorrow.
If I describe it or send photos, can you give me a rough range before you come?
Why ask it
Common jobs such as swapping a tank water heater or a toilet fill valve usually have a ballpark the office can share. Nobody can price a hidden leak sight unseen, and a firm figure offered without looking deserves some doubt.
Are the people you send background-checked, and will I get a name before they arrive?
Why ask it
You are letting a stranger into the house, sometimes while you are at work. Larger companies often text the technician's name and photo ahead of the visit; a one-person shop can simply tell you who is coming and what they drive.
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.
The quote
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.
Is that the full amount I will pay, or are there charges on top?
Why ask it
Trip charges, fuel surcharges, permit fees, disposal and sales tax all have a way of appearing below the line. Asking for the out-the-door number is the simplest way to put two quotes side by side.
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.
If you find something unexpected, will you stop and check with me before doing more?
Why ask it
Extra work agreed in a hallway is how a small bill doubles. Ask that any change come with a price and your yes, by text if nothing else, before another pipe is cut.
Would a repair hold for a few years, or does it make more sense to replace it?
Why ask it
The honest answer depends on how old the failing part is and how long you plan to stay in the house. Hearing a price for each choice, with a guess at how long the cheaper one lasts, lets you make the budget call yourself.
If it is hourly, when does the clock start, and is there a minimum charge?
Why ask it
Some companies bill from the moment the van leaves the shop, and some count a run to the supply house for a part. A one-hour minimum on a ten-minute fix is common, which is worth knowing before you call about a dripping faucet.
How long is this quote good for?
Why ask it
Material prices move, and a number written in spring may not be honored in the fall. A stated expiry also takes the sting out of a today-only offer, because you can see exactly how long you have to think.
When is payment due, and how much do you want up front?
Why ask it
A deposit that covers special-order parts is a common request, and some places cap how much a contractor may take up front, so check how it works where you live. Be wary of a cash-only job with no invoice: the paper trail is what you would lean on to show you paid or to make a warranty claim.
Which payment methods do you take, and is there a fee for paying by card?
Why ask it
Small shops sometimes add a few percent for cards, and larger ones may offer financing on big jobs. If financing comes up, ask for the rate and the full terms in writing before you treat a monthly payment as the price.
The work
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. Find out whether a licensed plumber stays on site or only signs off at the end, and whose warranty applies if a subcontractor did the job.
Does this job need a permit and an inspection?
Why ask it
Water heater replacements, repiping, gas work and sewer line repairs commonly need one, though the rules are set locally and the plumber should know yours. 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 will the job take, and how long will the water be off?
Why ask it
Time without water is what actually disrupts a household, and it rarely appears in a quote. On a job that runs past a day, check whether the water goes back on each evening or stays off until they finish.
What do you need me to do before you arrive?
Why ask it
Emptying the cabinet under the sink, moving the car off the driveway and shutting the dog in a bedroom can save half an hour of paid time. Ask too whether an adult has to be home throughout or only at the start and the finish.
Will you have to open a wall, floor or ceiling to reach it?
Why ask it
Where the hole goes is often negotiable. Going in through a closet or the back of a cabinet hides the patch, while cutting tile turns a plumbing job into a tiling job, so ask to see the spot before the saw comes out.
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. Pin down 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.
What should I expect when the water comes back on?
Why ask it
Draining and refilling the lines stirs up sediment and traps air, so faucets may sputter and an aerator or two can clog. Ask whether the water heater has to be switched off first, and who is responsible for turning it back on.
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 finished repair is worth weighing before you pay.
How will you test it before you leave?
Why ask it
A supply repair should sit under pressure and be watched for a few minutes while the cabinet or wall is still open. For a drain, the real test is a full sink or tub released all at once, since a trickle proves very little.
Warranty
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: a manufacturer that replaces a failed tank is not necessarily paying for the hours to swap it. Ask what happens if a repair fails in month four.
If the repair fails, is the return visit free, or do I pay the trip charge again?
Why ask it
A labor warranty that still bills for every visit is worth less than it sounds. Ask as well whether a warranty call goes to the front of the schedule or waits behind new customers.
Will the invoice list the work done, the parts fitted and the warranty terms?
Why ask it
For most people the invoice is the only warranty document they ever receive. One that reads 'plumbing repair' and a total will not help in a dispute, or when a buyer's inspector asks what was done years later.
Do I have to register the water heater or fixture with the manufacturer, or do you do that?
Why ask it
Some manufacturers give shorter coverage on a unit that was never registered, and the deadline can fall soon after installation. Find out who files it, and keep the model and serial number with your receipt.
Is there anything I could do that would void the warranty?
Why ask it
Exclusions you may hear include pouring chemical drain opener into a line they cleared, letting someone else rework the repair, or running water pressure above what the fixture is rated for. Better to get the list now than in a refusal later.
If something you installed leaks and damages a floor or ceiling, how is that handled?
Why ask it
The warranty speaks to the pipe; the ruined ceiling below it is a separate matter, often one for the company's liability insurer. Listen for a clear process and a named insurer, and be cautious of an answer that amounts to 'that never happens'.
Emergencies
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.
What should I do right now, until you get here?
Why ask it
Water keeps spreading for as long as the van takes to arrive, which is why this comes before any question about price. A good dispatcher will talk you to the valve at the fixture or the main and say whether the water heater should be turned off.
Can we keep using the other toilets and sinks while we wait?
Why ask it
It depends on what has failed. With the main drain blocked, every flush and shower upstairs can come back up at the lowest drain in the house, whereas a leak shut off at its own valve usually leaves everything else usable. Have them say which of the two you are dealing with.
Can this wait until morning, or does it need someone tonight?
Why ask it
A leak you can stop at a shut-off valve can often wait for normal rates, and a plumber who tells you so has just talked themselves out of an after-hours fee. Sewage coming up through a drain, or water you cannot stop, is a different conversation.
Can you make it safe tonight and quote the permanent repair separately?
Why ask it
Stopping the water and fixing the cause are two jobs, and only the first is urgent. Splitting them lets you decide on the bigger spend in daylight, with a written price and time to get a second one.
Can you write up what failed and take photos, in case I make an insurance claim?
Why ask it
Whether a leak is covered is the insurer's decision and policies differ, so do not expect the plumber to promise either way. What they can supply is a dated description of the cause, which is the kind of thing an adjuster tends to ask for.
Upkeep
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.
Did you notice anything else I should keep an eye on?
Why ask it
Someone who has just been under your sink or in the crawl space has seen what you have not: green crust on a valve, a bulging supply hose, a slow weep at a joint. Ask them to sort it into urgent, soon and someday, which also shows whether you are getting an observation or a sales pitch.
While you are here, can you show me the main shut-off and check that it still turns?
Why ask it
Valves that sit untouched for years can seize, or snap at the worst moment. Having a plumber work it while they are standing there, and tag it so everyone in the house can find it, is five minutes well spent.
How old is my water heater, and what signs should I watch for?
Why ask it
The age can usually be read from the serial number on the label, and a plumber decodes it in seconds. Rust-colored hot water, rumbling as it heats and damp around the base are the things to ask about, since a tank that lets go does it all at once.
Is my water pressure in a healthy range?
Why ask it
It takes a minute with a gauge on an outdoor faucet, and many plumbers carry one. Pressure that runs high is hard on hoses, valves and appliances long before anything visibly fails, so ask what number they read and what they would do about it.
What kind of pipe is in this house, and is any of it a known weak point?
Why ask it
Houses pick up a mix of materials over decades of repairs. Learning that the lines under the bathroom are old galvanized steel, or a plastic that has since fallen out of favor, lets you plan a replacement instead of meeting it as a flood.
Is that banging or gurgling in the pipes anything to worry about?
Why ask it
A bang when a valve snaps shut, a drain that gurgles as another fixture empties and a toilet that refills on its own each have a different cause, and only some are worth a repair. Note what was running when you heard it, or record it on your phone, because pipes rarely perform on request.
What should never go down these drains or this toilet?
Why ask it
Expect to hear grease, coffee grounds, wipes of every kind and too much at once through the disposal. Ask what they pull out of lines most often in your neighborhood, because the answer comes with stories and the stories stick.
What can I safely try myself on a slow drain before I call you?
Why ask it
Most will happily name the cheap tools: a plunger, a plastic hair snake, a bucket under the trap. Ask where they would stop, too. Some chemical openers are rough on older pipe and a hazard to whoever opens the line next, so say so if you have already poured one in.
What should I do to the plumbing before a hard freeze or a long trip away?
Why ask it
This one depends on your climate and on where the pipes run in your particular house, so have them point at the vulnerable spots. Outdoor faucets, lines in an unheated garage and whether to close the main while you travel all belong in the answer.
Is there yearly maintenance worth paying for, and what can I do myself?
Why ask it
Flushing a water heater, testing a sump pump and checking supply hoses are often within reach of a careful homeowner once someone has shown you how. If they sell a service plan, weigh its price against the visits you would really use, not against the length of the brochure.
Hiring a plumber
Practical guidance for the conversation itself
Before you call
- Find your main shut-off valve now, before you need it. If it is stiff, leave it and have the plumber work it during the visit, since an old valve can fail when it is forced.
- 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.
- Read a bid that comes in well under the others line by line. A low price sometimes means part of the scope was left out, and it tends to come back later as an extra.
- 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 usually pay a premium and 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.
- A smell of gas is not a call for the plumber's office. Leave the house and phone the gas utility or the emergency number from outside.
- Stay out of standing water that has reached outlets, cords or appliances, and tell the dispatcher about it.
- 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. Where a licensing board or consumer agency takes complaints, expect to be asked whether the plumber had a chance to put it right.
While the plumber is still there
- Save the upkeep questions for the end of the visit, once the repair is done and tested. If you are paying by the hour, pick the two or three that matter most for your house.
- Have them point out the main shut-off and any valve they touched, then label each one so the whole household can find it.
- Write down the water heater's age, the pipe materials and the pressure reading. The next plumber will ask, and so may a buyer.
- Before you pay, run the repaired fixture yourself and look underneath with a flashlight.