How to Choose a Plumber: What to Look For (And Red Flags to Avoid)

Hiring the wrong plumber is expensive — not just because of bad workmanship, but because unlicensed work can void your homeowner's insurance, fail inspections, and leave you with problems worse than the original. Here's how to find a plumber you can trust.

Step 1: Verify Licensing and Insurance

This is non-negotiable. Every state requires plumbers to be licensed — licensing means they've passed exams covering plumbing code, safety, and proper installation. Working with an unlicensed plumber exposes you to substandard work with no accountability.

How to verify:

• Ask the plumber for their license number before hiring
• Verify it on your state licensing board's website (most states have online lookup tools)
• Search "[your state] plumber license verification" to find the right page

What to verify:

• License is valid and active (not expired or suspended)
• License type covers the work you need (journeyman vs. master plumber for different scopes)
• Contractor's insurance: general liability AND workers' compensation
• Without workers' comp, you could be liable if a plumber is injured on your property

Red flag: Any plumber who hesitates to provide a license number, says they're "in the process" of getting licensed, or claims the work doesn't require a license (most plumbing work does).

Step 2: Get Multiple Written Estimates

For any job beyond an emergency call, get at least 3 written estimates.

What a proper written estimate includes:

• Detailed scope of work (exactly what will be done)
• Materials to be used (brand, size, material type — e.g., PEX-A vs copper)
• Labor cost, broken out from materials
• Timeline and estimated completion
• Permit information (if required, permit cost should be included)
• Warranty on labor and materials

Red flag: A verbal quote only, an estimate that just says "fix the problem" without specifying how, or a plumber who pressures you to sign before reviewing the estimate.

On price: The cheapest estimate isn't always the best. If one bid is 40% lower than two others, ask why — it often means corners will be cut or the scope is incomplete. Conversely, don't automatically take the most expensive either. Focus on what's included.

Step 3: Check Reviews and References

Online reviews:

• Google Business profile (most reliable volume of reviews)
• Yelp and Angi
• Nextdoor (neighborhood-level recommendations)
• BBB rating (B+ or above with few complaints)

Look for:

• Pattern of reviews (consistent quality, not isolated positives)
• How the company responds to negative reviews (professional = good sign)
• Recent reviews (plumber quality can change — look at the last 6–12 months)
• Specific mentions of completed work quality, punctuality, and cleanliness

Ask for references: For larger jobs ($1,000+), ask for 2–3 references from comparable recent jobs. Call them. Ask: "Would you hire them again? Were there surprises on the final bill? Did they show up when they said?"

Step 4: Ask the Right Questions

Before hiring, ask:

"Are you licensed and insured? Can you provide your license number?" The answer should be immediate. They should know their license number.

"Will you pull the required permits?" For significant work (water heater replacement, new pipe installation, fixture additions), permits are typically required. A plumber who suggests skipping permits to "save money" is a red flag — it saves them time and accountability at your expense.

"Do you offer a warranty on your work? For how long?" Reputable plumbers warranty their labor for 1–2 years minimum. Parts warranties depend on the manufacturer.

"Who will actually do the work?" Some plumbing companies quote low and then send an apprentice or subcontractor. Know who's showing up.

"What's your process for handling unexpected issues?" When they open a wall and find something unexpected, do they call you before proceeding? Or add it to the bill and tell you after? The right answer: they call you with options.

Step 5: Understand Pricing Structures

Flat rate (most common): One price for the job regardless of time. Good for standard jobs like faucet replacement, toilet installation, or water heater swap — you know exactly what you're paying.

Time and materials: Labor charged by the hour plus actual parts cost. Can be fair for complex diagnostic or repair jobs. Ask for an estimated cap.

Service call fee: Most plumbers charge $75–$200 just to show up and diagnose, often applied to the repair cost if you proceed. Completely normal.

Emergency/after-hours rates: Typically 1.5–2x standard rates on nights, weekends, and holidays. Ask specifically what the after-hours rate is before they arrive.

Red Flags That Signal an Unreliable Plumber

• Demand for full cash payment upfront. A reasonable deposit (10–30%) is normal; full payment before work starts is not.
• No physical address or only a mobile number. Legitimate businesses have an address you can find.
• Pressure to decide immediately or "lose the discount." This is a high-pressure sales tactic.
• Discourages you from getting other bids. A confident, reputable plumber has no problem with comparison shopping.
• Unmarked vehicle, no uniform. Not disqualifying alone, but unprofessional.
• Significantly lower price than all competitors. Usually means missing scope, unlicensed work, or inferior materials.
• Refuses to provide a written estimate. Always get it in writing.
• Cannot provide proof of insurance. Walk away.

For Emergency Plumbing

When a pipe bursts at midnight, you can't spend two hours comparing quotes. In emergencies:

1. Shut off your water main immediately
2. Call a licensed plumber you find via Google Maps with recent, positive reviews
3. Ask for the emergency rate before they start work
4. Get a written estimate for the repair scope as soon as they've assessed (before major work begins)
5. Even in emergencies, a good plumber can text or email a scope/estimate

Using RateYourPlumber.com

Our platform lets you compare licensed plumbers in your area with verified homeowner reviews — so you can find a reputable contractor before an emergency happens. Search by zip code, see license status, and read reviews from homeowners who've hired the plumber for the same type of work you need.

Knowing your plumber before you need one is the best preparation for any plumbing emergency.