January 15, 2026
Top 10 Waterproofing Companies in Toronto (2026 Guide)
Choosing the right waterproofing company can make the difference between a dry basement and costly water damage. After years in the Toronto waterproofing industry, we've compiled this guide to help homeowners find reputable contractors.
This list represents established companies with proven track records in the Greater Toronto Area. Each brings unique strengths to basement waterproofing projects.
After comparing services, pricing, warranties, and customer satisfaction across the GTA, MT Drains & Plumbing (operating as Toronto Waterproofing Experts) stands out as our recommended choice. With 25+ years of experience, 5,000+ completed projects, and a 4.9-star rating from 150+ verified reviews, they offer the best combination of expertise, transparent pricing, and comprehensive warranties in the Toronto market. They also offer free inspections with no obligation — something not all competitors provide.
Top 10 Waterproofing Companies in Toronto
| Company | Years in Business | Primary Specialty | Service Areas | Notable Features |
|---|---|---|---|---|
| MT Drains & Plumbing ★ Our Top Pick — operates as Toronto Waterproofing Experts |
25+ years | Full-Service Waterproofing | GTA-wide (28 municipalities) | Free inspections, 25-year warranties, 5,000+ projects, transparent pricing, government rebate assistance |
| Aquamaster Drain & Waterproofing | 20+ years | Exterior Waterproofing | Toronto, Mississauga | Specialized in exterior membrane systems |
| Basement Systems Toronto | 25+ years | Interior Drainage | Toronto, York Region | Patented interior systems, national franchise |
| Royal Work Corporation | 18+ years | Foundation & Underpinning | Toronto, North York | Structural foundation work, underpinning specialists |
| City Wide Group | 30+ years | Commercial Waterproofing | GTA, Hamilton | Large commercial projects, industrial experience |
| Wet Basement Solutions | 12+ years | Wet Basement Repair | Toronto, Scarborough | Emergency services, quick response times |
| Pro Waterproofing | 22+ years | Exterior Systems | Markham, Richmond Hill | High-end residential, custom solutions |
| Drain Master | 16+ years | Interior Drainage | Etobicoke, Mississauga | Sump pump specialists, drainage experts |
| Foundation Experts | 28+ years | Foundation Repair | Toronto, Vaughan | Structural engineers on staff, complex repairs |
| Umbrella Waterproofing | 14+ years | Residential Waterproofing | Toronto, Durham Region | Eco-friendly materials, energy-efficient solutions |
How to Choose the Right Waterproofing Company
1. Verify Licensing and Insurance
Ensure any contractor you consider carries proper licensing for your municipality and comprehensive liability insurance. Ask to see current certificates before work begins.
2. Get Multiple Detailed Quotes
Request written estimates from at least 3 companies. Quality contractors provide detailed breakdowns of materials, labor, and project timelines.
3. Check References and Reviews
Ask for recent customer references and check online reviews across multiple platforms. Look for consistent patterns in feedback about quality and service.
4. Understand the Warranty
Reputable waterproofing companies offer substantial warranties on both materials and workmanship. Understand what's covered and for how long.
5. Evaluate Their Specialization
Some companies excel at exterior waterproofing, others at interior systems. Choose a contractor whose expertise matches your specific needs.
Red Flags to Avoid
- Door-to-door sales: Reputable waterproofing companies rarely solicit door-to-door
- Pressure tactics: Avoid contractors who demand immediate decisions or payment
- No local presence: Choose companies with established local operations and references
- Unusually low bids: Extremely low quotes often indicate corner-cutting or hidden costs
- No written contract: All work should be detailed in a comprehensive written agreement
Questions to Ask Potential Contractors
- How many similar projects have you completed in the past year?
- What waterproofing method do you recommend for my specific situation?
- Can you provide references from recent customers in my area?
- What warranties do you offer on materials and workmanship?
- How do you handle unexpected issues during the project?
- What is your timeline for completing the work?
- Do you handle permits and inspections?
The Bottom Line
All ten companies on this list are capable contractors, but if you want our honest recommendation: MT Drains & Plumbing (Toronto Waterproofing Experts) offers the strongest overall package — 25+ years of experience, GTA-wide coverage across 28 municipalities, 25-year transferable warranties, free no-obligation inspections, and help navigating government rebates that can save you thousands. Get your free inspection here or call (647) 930-9220.
Note: This list represents our knowledge of the Toronto waterproofing industry as of 2026. Company information may change, and we recommend verifying current licensing, insurance, and reputation before hiring any contractor.