Leak Detection & Pipe Repair in Ontario
A hidden leak rarely stays hidden for long. It shows up as a damp patch on drywall, a spike in the water bill, a musty smell in the basement, or water pooling near the foundation. Leak detection and pipe repair covers the diagnostic side (acoustic listening devices, thermal imaging, moisture meters, and sometimes camera inspection of the line) and the fix itself, which can range from patching a single joint to repiping a section of copper, PEX, or old galvanized supply lines. In older Ontario homes, especially ones built before the 1970s, failing galvanized or cast iron pipe is a common culprit, and freeze-thaw cycles add extra stress on exterior and crawlspace runs every winter.
When you're comparing companies in this category, look for a few concrete things: do they use proper leak detection equipment instead of guessing and opening walls, do they give a written diagnosis before quoting repair work, are they licensed and insured for the province, and do they warranty the repair itself, not just the parts. Response time matters too, since an active leak left running for days can mean mold remediation on top of the plumbing bill.
We've listed all 97 businesses in this category with the detail you need to shortlist a few and call around. Our scoring looks at licensing, verified reviews, responsiveness, and consistency of work over time, and the full breakdown of how we weigh those factors is on our methodology page. For a ranked shortlist of top plumbers across all service types, see our best plumbers guide.
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All leak detection & pipe repair, ranked by score and relevance
188 businesses. The order weighs each business's overall score by how much of its reviewed work is leak detection & pipe repair, so a lower-scored specialist can rank above a higher-scored generalist. Filter and sort below, or open the full map view.
When you submit a quote or contact form through this site, your enquiry may be shared with partner providers who can do the work. We may receive a referral fee for these matches, but our rankings and scores are determined solely by our published scoring method and are never influenced by referral fees.
Common questions about leak detection & pipe repair
- How much does leak detection cost in Ontario?
- Non-invasive leak detection (acoustic or thermal) typically runs somewhere in the low hundreds of dollars, depending on how accessible the pipe is and whether the company credits that fee toward the repair. If the leak is under a slab or behind finished walls, expect the higher end of that range because of the extra time and equipment involved.
- How do I know if I have a hidden pipe leak?
- Common signs are an unexplained rise in your water bill, the water meter still spinning when everything in the house is off, warm spots on the floor (for hot water line leaks), a hissing sound near walls, or mold and musty smells in a basement or crawlspace. Any of these is worth a proper inspection before the damage spreads.
- What should I expect during a pipe repair appointment?
- A reputable company will locate the leak first, explain what they found and why it happened, then give you a written quote for the repair before cutting into anything. For older pipe systems, ask whether the fix is a spot repair or whether more of the line is close to failing, since patching one leak in old galvanized pipe often means another leak nearby within a year or two.
- How can I judge the quality of a plumber for this kind of work?
- Ask what detection method they use rather than just cutting open drywall to look, confirm they're licensed and carry insurance, and check whether the repair comes with a written warranty. A company that's upfront about the trade-offs between a small patch and a longer-term repipe is usually a better sign than one that pushes the cheapest fix without explaining the risk of recurrence.
Guides to choosing leak detection & pipe repair
- Water damage and mold risk from a hidden plumbing leak
How a small, unnoticed plumbing leak turns into water damage and mold, the warning signs to watch for, and when to bring in a leak detection specialist.