Most plumbing work happens behind walls, under floors, or in crawl spaces — places you can’t easily monitor and often can’t access at all. That makes the conversations you have during the job even more important. The right questions, asked at the right moments, keep you informed, catch problems early, and help you understand what you’re paying for.
“A homeowner who asks good questions during a job is my favourite kind of client. Not because they’re micromanaging — they’re not — but because it means they understand what’s being done to their home. When something unexpected comes up, those are the clients who trust my explanation and make fast decisions. That actually makes the job go smoother.”
— Claire Mbuyi, licensed journeyperson plumber and owner of a residential plumbing company in the Greater Toronto Area, with 14 years in the trade
Table of Contents
Before Work Starts That Day
Can you walk me through what you’ll be doing today?
A brief overview at the start of each visit — what the plumber plans to do, what tools or materials they need, and what they expect to find — keeps you oriented. It also sets a baseline so you notice if something changes.
What access do you need, and is anything off-limits?
Plumbers often need access to areas beyond the immediate work site — a main shutoff in the basement, a cleanout access panel, a utility room. Ask upfront what access they need and make sure those areas are clear. Also confirm which areas of your home are off-limits during the work.
Questions During the Job
What did you find, and how does it compare to what you expected?
When a plumber opens a wall or accesses a drain, ask them what they found. Was the pipe in the condition they expected? Is the existing work up to code? Were there any surprises? This question gets you information in real time and surfaces any additional work before the plumber has already done it without telling you.
Does anything you’ve found change the scope or cost of the job?
If what the plumber found is different from what was quoted — corroded pipe that needs more replacement, an improperly vented drain that needs correction, a fitting that’s non-standard and harder to work with — that should be raised with you before the scope expands. Ask directly whether anything discovered during the job will affect the price or timeline.
What a good answer looks like: A clear explanation of what was found, what it means for the job, and a written change order before any additional work is approved.
Can I see what you found before you cover it up?
For any work that involves opening walls, floors, or ceilings, ask to see the condition of the existing pipe and fittings before they’re covered back up. This is your last chance to observe the existing condition with your own eyes — and to ask questions about it. A confident plumber will welcome this. One who discourages you from looking should prompt scrutiny.
Are you following the required code for this type of installation?
You don’t need to know plumbing code yourself to ask this question. A licensed plumber should be able to explain what code requirements apply to your job and confirm they’re being met. For permitted work, the inspector will verify compliance — but it’s reasonable to ask the plumber directly.
Questions If Something Unexpected Comes Up
Is this an emergency, or can it wait?
Sometimes a plumber discovers a secondary problem while working on the primary one — a corroded valve that should be replaced, a pipe with signs of slow leakage, an undersized vent. Ask whether each discovered issue is urgent or whether it can be addressed at a later date. A plumber who says everything they find is an emergency that must be fixed today is a plumber to be cautious about.
What are my options for addressing this?
For any unexpected issue, ask for options — not just a single recommended solution. There may be a quick fix and a permanent fix, a code-minimum solution and a higher-quality one, an immediate repair and a monitored approach. Understanding your options helps you make a better decision and signals to the plumber that you’re an informed client.
Do I need to approve this before you proceed?
Any work beyond the original scope should require your explicit approval before it starts — and that approval should be in writing, even if it’s just a text exchange. Ask the plumber directly: do I need to sign off on this before you proceed? A professional will say yes.
Questions After the Work Is Done
Can you show me what you did and why?
Before the plumber packs up, ask for a brief walkthrough of the completed work. What was done, why it was done that way, and what you should watch for going forward. A plumber who can explain their own work clearly is a plumber who knows what they did.
Is there anything I should monitor or maintain?
Plumbing repairs often come with simple maintenance guidance — how often to run water through a seldom-used drain, when to replace a supply line hose, how to spot early signs that a repair may be failing. Ask for any relevant maintenance tips before the plumber leaves.
When should I call you again?
If the repair is the kind that could recur — a recurring drain blockage, a water pressure issue, a fixture that tends to wear — ask the plumber how long the fix should hold and what signs would indicate it’s time to call again. This sets realistic expectations and gives you a benchmark.
Related Questions
- Questions to Ask a Plumber Before You Hire One
- Questions to Ask a Plumber About Permits and Inspections
- Questions to Ask a Plumber About Warranties on Their Work
- What to Do If a Plumber Does Bad Work
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