How to Hire a Plumber for a Bathroom Remodel: What to Check Before You Sign

The plumber is the most important trade on a bathroom remodel — and the easiest to get wrong. A bad tile job is ugly. A bad plumbing job causes water damage, mold, and insurance headaches that cost 5-10x the original invoice. Here’s how to hire right.

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What to Look for When Hiring a Plumber for a Remodel

1. Licensed and Insured — Verified, Not Assumed

Every state requires plumbers to be licensed. Ask for the license number and verify it on your state’s contractor licensing board website. Takes 2 minutes and filters out the majority of unqualified contractors immediately. Ask for certificates of insurance — any legitimate contractor sends these without hesitation.

2. Bathroom Remodel Experience Specifically

General service plumbers and remodel plumbers are different specialties. Ask directly: “What percentage of your work is bathroom remodels vs. service calls?” You want someone who regularly does shower rough-ins and drain relocations.

3. Permit Coordination

Any plumbing that moves drain lines or installs new rough-in requires a permit. A plumber who suggests skipping permits is cutting corners. See our bathroom remodel permit guide for exactly what requires a permit.

Questions to Ask Before Hiring

Question	What a Good Answer Sounds Like
What’s your license number?	Gives it immediately, no hesitation
Do you carry general liability and workers’ comp?	Sends certificate same day
Will you pull permits for this work?	“Yes, included in our scope”
What waterproofing system do you use for shower pans?	Names a specific membrane (Schluter, RedGard, Laticrete)
How do you handle surprises found during demo?	Written change order process
What’s your warranty on labor?	Minimum 1 year on workmanship
Can you provide 2-3 references from bathroom remodels?	Ready to share immediately

Red Flags to Walk Away From

“We don’t need a permit for that” — for work that clearly requires one
Cash-only, no written contract
Can’t provide license number or insurance cert
Vague about waterproofing: “We use cement board” — cement board alone is not waterproofing
Pressure to decide same day
Extremely low bid — 40%+ below competing bids without explanation

How to Structure the Contract

Itemized scope of work — specific tasks, not vague “bathroom plumbing”
Permit responsibility — who pulls and pays for permits
Material specifications — brand and model of valve bodies, drain systems
Payment schedule — 30% deposit, 40% at rough-in inspection pass, 30% at completion
Change order process — all changes in writing before work proceeds
Warranty terms — labor warranty period explicitly stated

Never pay more than 30-40% upfront. Contractors who demand 50%+ before work starts are a serious risk.

GC vs. Hiring Direct

Option	Pros	Cons
General Contractor manages all trades	Single point of contact, schedule coordination, GC liability	GC markup 10-20% on subs
Hire plumber directly	Lower cost, direct relationship	You manage scheduling with other trades

For a full gut remodel with tile, electrical, and plumbing all moving, a GC typically earns their markup through coordination. For simpler scopes with one or two trades, hiring direct saves money.

What to Expect on Plumbing Costs

Budget $500-$8,000 for plumbing labor in a bathroom remodel. See the complete bathroom remodel plumbing cost breakdown for task-by-task pricing. For the full project budget, see our complete bathroom remodel cost guide. If your remodel surfaces a plumbing emergency, see what emergency plumbing service costs in 2026.

More Bathroom Remodel Guides

Need emergency plumbing help during your remodel? See what emergency plumber service costs in 2026 — and how to stop a water leak before the plumber arrives.

Ryan L

Ryan L. is a Dallas‑based home services authority with over a decade of hands‑on experience collaborating with plumbers, electricians, HVAC technicians, and other trades professionals nationwide. Though not a licensed technician himself, Ryan has spent thousands of hours learning directly from contractors mastering how plumbing systems work, pinpointing common failures, and uncovering the most reliable repair techniques. Leveraging his background in scaling home service businesses, Ryan bridges the gap between complex technical know‑how and homeowner concerns. From burst pipes and leaky faucets to clogged drains and water heater failures, he distills expert insights into clear, step‑by‑step guides no fluff, no fear tactics. Through Plumbing Sniper, Ryan’s mission is to empower everyday homeowners with the knowledge and confidence to tackle DIY repairs when they can and to know exactly when it’s time to call in a professional.