A leaky basement is stressful enough on its own. Hiring the wrong contractor to fix it makes everything worse — wasted money, recurring problems, and zero recourse when things go sideways. The waterproofing industry has more than its share of companies that overpromise, underdeliver, and disappear once the check clears. Knowing what to look for before you sign anything is the most important step in the entire process.
Start With Credentials, Not Price
Licensing and Insurance Are Non-Negotiable
Any contractor working on your foundation should carry both general liability insurance and workers’ compensation coverage. If someone gets hurt on your property and the contractor isn’t insured, you could be liable. Ask for certificates before anyone sets foot in your basement — a legitimate company will provide them without hesitation.
Licensing requirements vary by region, but at minimum your contractor should be able to demonstrate formal training and affiliation with a recognized industry body. BBB accreditation and membership in trade associations are good indicators that a company operates with some level of accountability.
Check How Long They’ve Been in Business
Waterproofing isn’t a skill you pick up in a season. Companies with fewer than five years in operation carry more risk — not because newer companies can’t do good work, but because you have less evidence they can. Look for a track record: completed projects, verifiable reviews, and ideally a physical address rather than just a phone number and a website.
Understand What They’re Actually Proposing
A Good Contractor Diagnoses First
Be wary of any company that gives you a quote over the phone without inspecting your basement in person. Water intrusion has many causes — foundation cracks, failed drainage tile, hydrostatic pressure, poor grading — and the right solution depends entirely on correctly identifying the source. Reputable contractors like Aqua Tech Waterproofing in Etobicoke conduct on-site assessments before recommending any work, because the diagnosis determines everything that follows.
Get the Scope of Work in Writing
A verbal quote is worth nothing. Before any work begins, you should have a written contract that specifies exactly what will be done, what materials will be used, how long the work will take, and what the payment schedule looks like. If a contractor resists putting details in writing, that’s your answer about how disputes will be handled later.
Pay particular attention to what the contract says about site cleanup and restoration. Waterproofing — especially exterior work — involves excavation and disruption. A professional crew restores the site; an unprofessional one leaves that problem for you.
The Warranty Question Most Homeowners Forget to Ask
What Does the Warranty Actually Cover?
Most waterproofing contractors offer some form of warranty, but the details matter enormously. A one-year warranty on labor and materials is the bare minimum — and it’s rarely enough for work that’s meant to protect your home for decades. Look for a lifetime warranty, and find out whether it’s transferable to a new owner if you sell the house. A transferable lifetime warranty is a genuine selling point when the time comes to list your property.
Ask specifically what happens if water returns within the warranty period. The answer should be clear: they come back, they fix it, at no cost to you. If the contractor hedges or adds conditions, that warranty is less valuable than it looks on paper.
One More Thing: Trust Your Gut
How a company treats you during the sales process tells you a great deal about how they’ll treat you when a problem arises later. A contractor who listens carefully, explains their reasoning, doesn’t pressure you to sign immediately, and answers your questions directly is showing you something. So is one who rushes the visit, inflates urgency, and hands you a tablet to sign before you’ve finished asking questions.
Your basement is a significant part of your home’s structure. The contractor you choose to work on it should earn that trust — not just ask for it.
The right contractor isn’t always the cheapest or the fastest. They’re the one who can tell you exactly what’s wrong, exactly what they’ll do about it, and exactly what happens if they’re wrong.