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True Trade Path

Hire guide · Reviewed 2026-10-06

How to hire a plumber you can trust

Verification, fair quotes, contracts and red flags — written for homeowners, not contractors pitching you.

Verify at the source — reviewed 2026-10-06

Licensing, insurance and deposit rules vary by state and city. Use this page to know what to ask; the state board lookup and your written contract are what actually protect you.

Three things that matter before you hire plumbers

  1. Always verify a Master Plumber or Plumbing Contractor state license number on the state licensing database before hiring or issuing payments.
  2. The plumbing contractor must pull the plumbing permit and coordinate municipal inspection for any work touching supply lines, gas lines, or DWV (drain-waste-vent) systems.
  3. Ensure quotes clearly itemize pipe material (e.g., L-copper, PEX-a, Schedule 40 PVC), fixture brands, excavation depth, cleanout locations, and surface restoration.

The two-minute verification routine

  1. Step 1. Request the plumbing contractor's license number and exact corporate name.
  2. Step 2. Verify status on your state plumbing board lookup portal (e.g., TSBPE in Texas, CSLB in California, state health/licensing board in other states).
  3. Step 3. Request a Certificate of Insurance (COI) sent directly from their insurance carrier specifying $1,000,000 general liability and active workers' compensation.
  4. Step 4. Verify gasfitter endorsement credentials if the scope of work includes natural gas or LP propane piping.
  5. Step 5. Check with your municipal building department to ensure the contractor maintains active local bonding and registration.

State licensing guides with lookup links: Licensing by state

Licence, insurance and bond expectations

Plumbing is strictly regulated due to public health and sanitation risks. Most states mandate Journeyman and Master Plumber licenses, plus a separate Plumbing Contractor business license. Medical gas and backflow prevention require specialized state endorsements. Plumbing contractors must carry $1,000,000+ in general liability to protect against major water damage, plus workers' compensation. Surety bonds ($10,000–$25,000) are commonly required by state licensing boards or local cities to guarantee code compliance and street restoration for lateral sewer connections.

What a fair quote must itemize

  • Water supply piping material and fitting type (e.g., Expansion PEX-a, Type L rigid copper with press fittings)
  • Drainage and vent piping specification (e.g., Schedule 40 PVC, ABS, or hubless cast iron)
  • Water heater specs: tank capacity, recovery rate, fuel type, expansion tank, pan, and shutoff valve
  • Sewer lateral repair method (open trench vs trenchless pipe lining / pipe bursting) and total linear footage
  • Gas piping scope including pipe material (CSST vs black iron), pressure test pressure/duration, and shutoff valves
  • Cleanout installation specs, backflow prevention assembly model, and location details
  • Municipal permit fees, inspection scheduling, and required utility markout (811) coordination
  • Excavation backfill, compaction testing, concrete/asphalt restoration scope, or explicit write-off exclusions

Fair price orientation

National planning ranges for common plumber jobs — use these to sanity-check a written quote, not as a bid target.

Cost guides

Red flags specific to plumbers

  • Recommends replacing a complete sewer lateral without showing you live camera video footage of the pipe interior.
  • Asks the homeowner to pull a plumbing permit for water heater replacement, gas line modification, or sewer work.
  • Fails to provide proof of gasfitter endorsement or license when modifying gas supply lines to appliances.
  • Refuses to perform a pressure drop test on gas lines before energizing new gas equipment.
  • Demands 50% or more as an upfront cash deposit before materials arrive on the jobsite.
  • Uses prohibited materials like polybutylene, unapproved saddle valves, or illegal S-traps in drainage.
  • Offers no written contract detailing pipe materials, manufacturer brands, or warranty terms.
  • Disregards local backflow assembly testing requirements for irrigation or commercial cross-connections.

Questions to ask, by stage

Before you call

  • Is your company licensed as a Plumbing Contractor, and who is the Master Plumber of record?
  • Do you carry $1M+ in general liability insurance and workers' compensation coverage?
  • Are you equipped with sewer camera inspection and trenchless repair equipment in-house?
  • What is your standard trip fee and hourly rate for diagnostic troubleshooting?

On site / in the estimate

  • Will you record a video camera inspection of the drain or sewer line and provide me a copy?
  • What specific pipe material (PEX-a, Copper, PVC) do you recommend for this job and why?
  • Does this project require a plumbing permit, gas pressure test, or municipal inspection?
  • How will you protect my home flooring, landscaping, or concrete during excavation?

Before you sign

  • Is the quote fixed-price, and does it include all permit fees and utility locator calls?
  • What is the exact milestone payment schedule tied to passed rough-in and final plumbing inspections?
  • What warranty do you offer on labor, pipe fittings, and major appliances like water heaters?
  • Does the quote include full backfill, compaction, and concrete/lawn restoration after digging?

Contract must-haves

  • Exact pipe materials, wall thickness/schedules, and fitting systems clearly specified.
  • Explicit line item committing contractor to pull permits, call 811 utility locates, and pass city inspections.
  • Detailed fixed price schedule including permit fees, equipment rentals, and disposal costs.
  • Progress payment milestones linked to passed rough-in and final plumbing sign-offs.
  • Requirement for sewer camera inspection video recording to be provided upon job completion.
  • Clear specification of landscaping, concrete, or drywall restoration responsibilities.

Payment schedule and deposit norms

Standard plumbing deposits should not exceed 10% to 20% or $1,000 upfront. On major repiping, sewer lateral replacement, or bathroom rough-ins, structure payments across 3 milestones: 10% deposit upon contract signing, 40% upon rough-in completion and material delivery, 30% after passing municipal rough-in plumbing inspection, and the final 20% retainage paid only after final inspection and fixture testing are completed.

Who pulls the permit

The Master Plumber or Plumbing Contractor MUST pull the plumbing permit. Water heater swaps, gas line extensions, sewer repairs, and internal repiping legally require municipal permits in almost all jurisdictions. Contractors who ask homeowners to pull owner-builder permits are often operating without valid licensing or insurance.

Warranty expectations

Expect a 1-year to 5-year contractor warranty on installation labor and drain/pipe connections. Water heaters carry 6-year to 12-year tank warranties from manufacturers like Bradford White, Rheem, or AO Smith. Trenchless sewer lining often carries a 10-year to 50-year manufacturer material warranty. Ensure labor coverage on replacement parts is documented in writing.

If it goes wrong

  1. Submit a written dispute detailing leaks, code failures, or unfinished work via certified mail to the contractor.
  2. Withhold final milestone payment until all items on the written punch list pass inspection.
  3. Schedule a re-inspection with your local municipal plumbing inspector to document code violations.
  4. File an administrative complaint with your state plumbing licensing board (e.g., TSBPE in TX, CSLB in CA).
  5. File a claim against the contractor's state plumbing bond or contractor recovery fund for financial recovery.

Emergency hiring vs scheduled work

Emergency plumbing calls (burst water main, active sewage backing up into home, gas leaks) require immediate shutoff and emergency response. Expect emergency dispatch fees ($150–$300) and premium rates (1.5x–2x). For scheduled jobs (water heater replacements, fixture upgrades, sewer relining), collect 2 to 3 detailed quotes, verify licensing, and require full itemized scope proposals.

Find plumbers near you

Browse by metro for local licensing notes and verified listings where we have them. We do not rank or sell placement — filter by what you need.

Metro directory

Symptom → trade router

Tools before you hire

Free tools

Frequently asked questions

How do I check if a plumber is licensed in my state?
Search your state plumbing board or department of licensing database (e.g., TSBPE in Texas, CSLB in California). Verify that the Master Plumber license status is active and matches the contractor's company name.
Why do plumbers need to perform a camera inspection on sewer lines?
A sewer camera inspection provides visual proof of structural pipe failure, root intrusion, offset joints, or belly conditions. Never authorize a full sewer lateral replacement ($5,000–$20,000) without seeing video evidence.
Is a permit required to replace a water heater?
Yes. Nearly all U.S. municipalities require a plumbing permit and inspection for water heater replacement to verify safety features like thermal expansion tanks, temperature-pressure relief valves, gas venting, and earthquake strapping.
What deposit is reasonable for a major plumbing job?
A reasonable deposit is 10% to 20% upfront. Avoid contractors demanding 50% or more in cash before materials arrive at your home.
What is the difference between PEX-a and PEX-b tubing?
PEX-a (Engel method) is more flexible, has shape memory, and uses expansion fittings that won't restrict flow. PEX-b (silane method) is slightly stiffer and uses crimp fittings. PEX-a is widely preferred by professional repipe specialists.
What should I do immediately if I smell gas in my home?
Evacuate the house immediately, do not operate electrical switches, call 911 and your gas utility from outdoors, and contact a licensed plumbing/gasfitter contractor once the utility secures the main meter.
How long does a water heater typically last?
Tank water heaters last 8 to 12 years on average. Tankless water heaters can last 15 to 20 years with annual maintenance and flushing to remove scale buildup.
Who is responsible for the sewer line under the street?
In most cities, the homeowner owns and is financially responsible for the sewer lateral all the way from the house to the connection at the city main in the street, unless your city has a specific lateral warranty program.
What is trenchless pipe lining (CIPP)?
Cured-In-Place Pipe (CIPP) lining inserts an epoxy-saturated sleeve inside an existing damaged sewer pipe, curing it into a smooth, seamless structural pipe without digging up lawns or driveways.
What is a backflow preventer and why is it inspected annually?
A backflow preventer prevents contaminated water from irrigation or boilers from siphoning backward into drinking water. Municipalities mandate annual testing by a certified backflow assembly tester.
Why should a plumber carry workers' compensation insurance?
Plumbing work carries high risk of injury from heavy lifting, trench cave-ins, and power tool use. If an uninsured worker is injured on your property, you could be sued as the property owner.
What is a slab leak and how is it fixed?
A slab leak occurs when a copper water pipe under a concrete foundation leaks. Repairs involve either jackhammering the slab for a spot repair or performing an overhead PEX reroute through walls and attics.

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