The Complete Checklist
7 Things to Check Before Hiring a Plumber
Valid Idaho Plumbing License
This is non-negotiable. Idaho requires all plumbers to be licensed through the Division of Occupational and Professional Licenses (DOPL). A legitimate plumber will have a journeyman or master plumber license number and won't hesitate to share it. If they dodge the question, walk away. You can verify any license in about 30 seconds on the DOPL website.
Proof of Insurance
Ask for a certificate of general liability insurance -- $500,000 minimum is standard for residential plumbing in the Treasure Valley. If a plumber damages your property or an accident occurs on the job, insurance protects you from bearing the financial burden. Workers' compensation insurance is equally important if the plumber has employees.
Online Reviews and Reputation
Check Google Business Profile, Yelp, and the BBB. Look for plumbers with at least 20 reviews and a 4.0+ star average. Pay attention to how they respond to negative reviews -- that tells you more about their professionalism than the 5-star posts. In the Boise market, local reputation spreads fast, so companies that consistently do poor work don't last long.
Written Estimates
Never agree to plumbing work based on a verbal quote. A professional plumber will provide a written estimate that breaks down labor, materials, and any permit fees. For larger jobs like re-piping or water heater installations, get 2-3 written quotes so you understand the realistic price range. The estimate should also include a timeline and scope of work.
Warranty on Work
Reputable Boise plumbers stand behind their work. Ask what warranty they offer on both labor and parts. A minimum one-year warranty on labor is standard; many quality shops offer two years. Parts warranties vary by manufacturer but should be passed through to you. Get the warranty terms in writing before work begins.
Response Time and Availability
For emergencies, you need a plumber who can arrive within an hour. For scheduled work, same-day or next-day appointments are reasonable in the Boise market. If a plumber can't give you a clear appointment window or takes days to return your call, that's a signal of how they'll communicate throughout the project.
Local Treasure Valley Experience
Boise-area homes have specific plumbing quirks. The Treasure Valley's hard water (averaging 12-17 grains per gallon) accelerates mineral buildup in pipes and water heaters. Homes in the North End and Bench neighborhoods built before 1970 often have galvanized steel or cast iron pipes that need specialized attention. A plumber with local experience knows these issues and arrives prepared with the right parts and solutions.
How to Verify an Idaho Plumber's License
Verifying a plumber's license takes less than a minute. Here's how:
- Go to the Idaho DOPL Licensee Search
- Select "Plumbing" as the license type
- Enter the plumber's name or license number
- Verify the license is active (not expired, suspended, or revoked)
- Check the license level: journeyman plumbers can work independently, while apprentices must be supervised
If a plumber refuses to share their license number, that's your first and biggest red flag. Every licensed plumber in Idaho is in the DOPL database and there's no legitimate reason to withhold that information.
Red Flags When Hiring a Plumber
Watch out for these warning signs. Any one of them is reason enough to find a different plumber:
No license number provided
Idaho law requires a plumbing license. No exceptions.
Cash-only payment
Legitimate businesses accept multiple payment methods and provide receipts.
No written estimate
Verbal-only quotes lead to surprise charges. Always get it in writing.
High-pressure tactics
Demanding immediate decisions or large upfront deposits is a warning sign.
Door-to-door solicitation
Legitimate plumbers don't go door-to-door looking for work after storms or cold snaps.
Quote far below competitors
If a quote is 40%+ below others, they may cut corners or add surprise charges later.
Questions to Ask Before Hiring
Print this checklist or save it on your phone. Ask these questions on the first call or during the estimate visit:
- "What is your Idaho plumbing license number?"
- "Can you provide a certificate of insurance?"
- "Will you provide a written estimate before starting?"
- "What warranty do you offer on labor and parts?"
- "Will you pull the necessary permits through Ada County or my city?"
- "How long have you been working in the Treasure Valley?"
- "What's your typical timeline for this type of job?"
- "Do you charge a trip fee or diagnostic fee?"
Boise-Specific Plumbing Considerations
The Treasure Valley has plumbing challenges that don't exist in other markets. When choosing a plumber, make sure they understand these local factors:
- Hard water damage: Boise's municipal water supply averages 12-17 grains of hardness per gallon. This accelerates sediment buildup in water heaters (reducing efficiency and lifespan by 2-4 years) and causes mineral deposits in pipes and fixtures. A good plumber will recommend water softener options and flush your water heater during service calls.
- Older homes in the North End and Bench: Pre-1970 homes in these neighborhoods often have galvanized steel supply lines and cast iron drain lines. These materials corrode from the inside, reducing water pressure and eventually causing leaks inside walls. If you own an older Boise home, your plumber should be experienced with full and partial re-piping projects.
- Ada County vs. Canyon County permits: Plumbing permits in Ada County (Boise, Eagle, Meridian, Kuna) are handled differently than Canyon County (Nampa, Caldwell). Cities like Meridian process permits through their own building department, while unincorporated Ada County areas go through the county. Your plumber should know which jurisdiction applies to your address and handle the permit process.
- Freeze-thaw pipe damage: Boise winters regularly dip into the 20s, with occasional single-digit cold snaps. Pipes in exterior walls, crawl spaces, and unheated garages are vulnerable. A local plumber will know the common failure points for Boise-area home construction and can help you winterize your pipes before the first freeze.