Questions to ask before you hire a plumber

Questions to ask

1. Are you licensed and insured in this city or county, and can I see the license number?

Why it matters: Licensing rules vary by jurisdiction. A verifiable license number lets you check status with the local board. Ask for proof of liability insurance and workers’ compensation if they bring helpers.

2. Will the estimate be written, itemized, and binding — or is it a rough range?

Why it matters: Verbal quotes invite surprise charges. An itemized written estimate (parts, labor, permit fees, trip charge) makes apples-to-apples comparison possible and reduces disputes later.

3. Who will actually do the work — you, an employee, or a subcontractor?

Why it matters: Some companies dispatch less experienced techs or subcontractors. Knowing who shows up affects quality, warranty responsibility, and whether the person on-site is covered by the company’s insurance.

4. What is your warranty on parts and labor, and what voids it?

Why it matters: A clear warranty (duration, what it covers, how to claim) is a signal of confidence. Ask whether manufacturer warranties transfer and whether DIY follow-up work voids their labor warranty.

5. Do you pull required permits, and is that included in the price?

Why it matters: Water heaters, sewer line work, and some gas piping often require permits and inspection. Pros who skip permits leave you exposed if something fails or when you sell the home.

6. How do you price emergency or after-hours calls?

Why it matters: Emergency rates can be 1.5–2× normal. Get the after-hours multiplier, minimum call-out fee, and whether diagnosis time is billed separately before you authorize a night visit.

7. What brand or grade of fixtures and parts do you typically install, and can I choose?

Why it matters: Cheap valves and supply lines fail early. Ask about options (builder-grade vs mid-tier) and whether they will install customer-supplied fixtures — and how that affects warranty.

8. How will you protect floors and belongings, and how do you handle cleanup?

Why it matters: Plumbing jobs track water and debris. Pros who bring drop cloths, shoe covers, and a cleanup plan reduce secondary damage and show they treat your home as a worksite, not a pit stop.

9. If you find additional problems once work starts, how do you get approval before proceeding?

Why it matters: Open-ended “we’ll know more once we open it up” jobs can balloon. Require a stop-and-call process with a written change order before extra work begins.

10. Can you provide recent local references for similar jobs?

Why it matters: A water heater swap is different from a whole-house repipe. References for comparable work help you gauge punctuality, communication, and whether the fix lasted.

Red flags

• Cash-only demand, or pressure to pay the full amount before work starts.
• No written estimate, or vague “it depends” pricing with no cap.
• Cannot or will not provide a license number or insurance certificate.
• Discourages permits “to save you money.”
• Offers a dramatically lower bid with no explanation of scope differences.
• Arrives unmarked, or wants you to leave the house while they work with no identification.

Next-step checklist

• Verify license status on your state or city contractor board website.
• Get at least two written, itemized estimates for the same scope.
• Confirm liability insurance (ask for a certificate with your address if the job is large).
• Agree in writing on warranty length, payment schedule, and change-order process.
• Photograph the problem area before work begins.
• Keep receipts, permit numbers, and the final invoice for future buyers or warranty claims.