How do I choose a good plumber?

Start with the Arizona ROC license, because it is the one fact that proves the contractor is legitimate. The Arizona Registrar of Contractors licenses plumbers and lists each license classification, such as C-37 for commercial plumbing, R-37 for residential plumbing, or a combined dual license. There is also A-12 for sewers, drains, and pipe-laying work. The classification matters: a license is only valid for the kind of work it covers, so match the classification to your job before you hire.

Run a free license check on the ROC website. Confirm three things:

1. 1Status is Active. An expired or suspended license is a hard stop.
2. 2The classification matches the work. A sewer line replacement and a faucet swap are not the same scope.
3. 3The bond is in place and the complaint history is clean. A pattern of complaints tells you what reviews may not.

If you want a step-by-step walk-through of the lookup, see our guide on how to verify a plumber's Arizona ROC license. Doing this one check first saves you from the most common and most expensive mistakes.

Bonded and insured is not marketing language; it is your financial safety net. A license bond in Arizona ranges from $4,250 to $100,000 depending on the license type, and residential contractors must either join the Residential Contractors' Recovery Fund or post a $200,000 bond. The Recovery Fund, set by A.R.S. 32-1132 and 32-1132.01, can reimburse a homeowner up to $30,000 per claimant for damage caused by a licensed residential contractor whose license is later suspended or revoked over a complaint. Hire an unlicensed person and you have no recourse to that fund at all.

Insurance protects you from a different risk: an injury or accident on your property. The FTC is direct about this. It advises that a contractor "should have personal liability, worker's compensation, and property damage coverage," and warns to ask for current insurance certificates, because without them "you could be held liable" if a worker is hurt at your home.

So do not take a verbal "yes, we're insured." Ask for the current certificates of insurance and confirm the coverage is active. Our page on why a licensed, bonded, and insured plumber matters explains how these three protections fit together.

Reviews and estimates tell you about quality and price, but only if you read them with a clear eye. Start by reading recent reviews across more than one site and checking the company's Better Business Bureau profile for its rating and how it answers complaints. One angry review is noise; a pattern is a signal. Look for comments about cleanup, schedule, and whether the final price matched the quote.

Then get multiple written estimates. The FTC advises getting estimates from several contractors and says a written estimate should list the work to be done, the materials, the completion date, and the price. Do not automatically take the lowest number. A bid far below the others often means a missing step, cheaper parts, or a price that climbs once the work starts.

Use this short comparison checklist:

• Is the estimate written and itemized, not a single lump sum?
• Does it name the specific materials and the scope of work?
• Does it state a completion date and a clear price?
• Does it spell out who pays for permits and what the warranty covers?
• Are the bids close enough that the lowest one is not hiding something?

Itemized written quotes also make the next steps, permits and warranty, easy to confirm.

Ask who pulls the permit. In Phoenix, jobs like a water heater changeout, a repipe, gas piping, or a sewer service line generally require a permit, and a permit means a city inspector checks the work against code. A licensed contractor should handle the permit as a normal pass-through cost, not treat it as optional. If a plumber suggests skipping the permit to save money, that is a warning sign, not a favor.

Next, get the warranty in writing. Ask how long the labor is guaranteed, what the parts or manufacturer warranty covers, and how you request a callback if something fails. A confident plumber stands behind the work in writing.

Then confirm who does the work and the cleanup. Ask whether the company's own licensed crew performs the job or whether it subcontracts, who supervises, and whether they haul away old parts and clean the site when they finish. For a longer list of these conversation starters, see our guide on questions to ask before hiring a plumber. Clear answers here separate a professional outfit from one that cuts corners once the truck leaves.

Some behaviors are reliable signs of a scam, and the FTC names them plainly. Treat the following as reasons to stop and choose someone else.

• Pressure for an immediate decision. A trustworthy plumber gives you time to compare bids. Urgency is a sales tactic.
• Cash-only deals or full payment up front. The FTC warns against paying cash and against paying in full before the work is done. Reasonable deposits are normal; a demand for the whole amount on day one is not.
• "Leftover materials" door-to-door offers. The FTC flags the salesperson who shows up claiming to have materials left over from a nearby job. The agency advises: "Don't do business with someone who just shows up." Legitimate plumbers do not sell that way.
• No written estimate or a refusal to itemize. If they will not put the scope, materials, and price in writing, you cannot hold them to anything.
• No verifiable license or insurance. If you cannot confirm an active ROC license and current insurance certificates, that alone is enough to pass.

A good rule: never make final payment until the work is finished and you are satisfied, and never let urgency rush you past the basic checks above. A plumber who balks at any of these steps is telling you how the rest of the job will go.

Choosing a good plumber comes down to a short, repeatable routine, so it helps to run the whole thing as one checklist. Verify the active Arizona ROC license and confirm the classification matches your job. Confirm the contractor is bonded and insured, and ask for the current insurance certificates the FTC says you need. Read reviews and check the BBB. Collect multiple written, itemized estimates and resist the urge to grab the cheapest one. Settle the permit and warranty terms in writing, and confirm who does the work and the cleanup. Watch for the red flags, the pressure, the cash-only push, the door-to-door pitch, and walk away when you see them.

Run that routine and you turn a hidden, high-stakes decision into a confident one. The plumber who welcomes your questions, shows the license, hands over a clear written quote, and stands behind the work in writing is the one worth hiring. None of these steps takes long on its own, and together they cost you a phone call and a little patience. That is a small price next to a repipe done wrong or a flooded slab, and it is the difference between hoping you picked well and knowing you did.