10 Questions to Ask a Plumber Before You Hire Them

Hiring a plumber is one of those decisions that feels straightforward until something goes wrong. The best way to protect yourself is to ask the right questions upfront, before anyone picks up a wrench. Most good plumbers will welcome these questions. They signal that you are a serious homeowner who expects professional work.

Here are ten questions worth asking, along with what to listen for in the answers.

1. Are You Licensed in This State?

Licensing requirements for plumbers vary by state and province, but in most places, plumbers must complete a formal apprenticeship and pass a licensing exam before they can work independently. Ask directly, and then verify independently through your state's contractor licensing board website.

A licensed plumber is accountable to a regulatory body. If they do substandard work or behave dishonestly, you have a formal avenue for complaint. An unlicensed plumber gives you no such protection.

2. Do You Carry Liability Insurance and Workers' Compensation?

Ask for proof of both. General liability insurance covers damage to your property if something goes wrong. Workers' compensation covers any injuries to the plumber or their employees while working in your home.

If a worker without workers' comp is injured on your property, you could be exposed to a legal claim. This is not a theoretical risk. Ask, verify, and do not let anyone start work until you have seen a current certificate of insurance.

3. Will You Pull the Required Permits?

Certain plumbing jobs — water heater replacements, major pipe work, adding new fixtures — require a permit from your local municipality. Permits exist so that a qualified inspector can verify the work meets code.

A plumber who skips permits to save time is taking a shortcut that affects you, not them. Unpermitted work can complicate a home sale, void your homeowner's insurance coverage for related claims, and create liability if something fails later. Always ask whether a permit is required for your job, and expect your plumber to handle obtaining it.

4. Who Will Actually Be Doing the Work?

Many plumbing companies send out estimators or project managers and then dispatch a different technician to do the actual work. There is nothing wrong with this model, but you should know who will be in your home. Ask whether the person doing the work is a licensed plumber or an apprentice, and whether they are an employee of the company or a subcontractor.

5. Can You Give Me a Written Estimate?

A verbal quote is better than nothing, but a written estimate protects both of you. It should specify the scope of work, the parts to be used, the estimated labor time, and the total cost. If the plumber is reluctant to put anything in writing, take that as a warning sign.

For larger jobs, a written contract spelling out payment terms and what happens if the scope changes is even better.

6. How Do You Handle Unexpected Issues?

Plumbing jobs sometimes reveal problems that weren't visible in the initial assessment. A water heater replacement might uncover corroded pipes. A drain cleaning might reveal a cracked sewer line.

Ask your plumber what happens in that scenario. Will they stop work and call you before proceeding? Or will they make decisions on the fly and present you with a larger bill afterward? You want a plumber who treats you as a partner in the decision, not just a source of payment.

7. What Parts Will You Use?

Not all plumbing parts are created equal. Ask whether the plumber uses name-brand parts from reputable manufacturers or generic alternatives. For fixtures and appliances, ask whether you have the option to supply your own parts (some homeowners find better prices at supply stores), and whether doing so affects the labor warranty.

8. What Is Your Warranty on Parts and Labor?

A professional plumber stands behind their work. Ask specifically what they warrant and for how long. One year on labor is typical. Parts warranties depend on the manufacturer and usually run longer. Get the warranty terms in writing if possible.

If a plumber offers no warranty at all, that tells you something about how confident they are in the quality of their work.

9. How Do You Calculate Your Charges?

Some plumbers charge a flat rate per job. Others charge hourly plus parts. Some have a diagnostic or service call fee that applies whether or not you proceed with the repair. Understanding the billing structure before work begins prevents surprises on the invoice.

Ask specifically whether there is a minimum charge, how overtime or after-hours rates work if applicable, and whether the estimate includes disposal of old parts or materials.

10. Do You Have References I Can Contact?

For larger jobs, asking for two or three references from recent customers is entirely reasonable. A plumber with a solid track record will be glad to provide them. If they hesitate or cannot produce any references, consider that a red flag.

Alternatively, check their Google or Yelp reviews and look for recent, detailed feedback. Pay attention to reviews that mention projects similar to yours in scope.

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These ten questions take only a few minutes to ask and can save you from a situation that costs far more in time, money, and stress. A confident, professional plumber will answer every one of them without hesitation.