Waterproofing covers the membranes, coatings, and drainage work that keep water out of a building where roofing alone can't do the job: flat roof decks, below-grade foundations, balconies, and below-grade parking structures. In Mississauga, that usually means dealing with heavy spring runoff, winter freeze-thaw cycles, and clay-heavy soil that holds water against foundation walls longer than sandier soils do. This category lists 13 businesses in the city that handle that kind of work, from spot repairs on a leaking flat roof to full foundation membrane and weeping tile jobs.
A good waterproofing contractor starts with a proper diagnosis, not just a quote. That means checking where water is actually entering (which is often not where it shows up inside), grading and drainage around the property, and the condition of existing membranes or damp-proofing before proposing a fix. Ask what product system they use (rubberized membrane, liquid-applied coating, sheet membrane, or a drainage board and weeping tile system), what the warranty covers and for how long, and whether they pull permits when the work requires it. Get more than one opinion if someone recommends full excavation before ruling out cheaper fixes like grading, downspout extensions, or interior sealant work.
Our scores weigh licensing and insurance, warranty terms, response time, and verified customer feedback, so you can compare contractors on more than star ratings alone. For a full ranked breakdown of roofing and waterproofing contractors serving the city, see our best roofing contractors in Mississauga guide. Details on how we calculate scores are on our methodology page.
Get quotes from suitable waterproofing service in Mississauga
No cost, no obligation. Describe your roofing project and we'll match you with contractors who can help.
13 businesses, scored on recent reviews. The order weighs each business's overall score by how much of its reviewed work is waterproofing service, so a lower-scored specialist can rank above a higher-scored generalist.
Alex and his team consistently earn five-star ratings for leak diagnosis, shingle replacement, and gutter work done with precision and care. They keep job sites clean, send photo updates throughout, and stick to timelines and pricing, earning trust across dozens of repeat referrals.
Andrew and his crew deliver emergency repairs within hours and replacements within days, backed by drone inspections and detailed explanations at every step. Reviewers consistently praise their honesty about what work is needed, the professionalism of team members like Enrique and Agustin, and meticulous cleanup after the job finishes. Service spans roof repairs, replacements, chimney work, and damage from storms. Andrew responds to calls on weekends and fits urgent requests into his schedule quickly. Customers describe feeling informed and stress-free throughout, with pricing described as fair and quotes explained clearly before work begins.
Angel Brothers installers and the sales team deliver consistently polished work, from eavestrough replacements to Gemstone lighting. Customers praise the walk-throughs, cleanup, and no-mess installations; one reviewer noted the crew upgraded their earlier Gemstone system at no charge when standards improved. LeafGuard has performed through major rainstorms on multi-year-old installations, winning over neighbours. Across thirteen Gemstone reviews and six eavestrough or LeafGuard reviews, professionalism and product performance stand out as reasons customers recommend widely. The business operates as the Official LeafGuard Dealer serving the GTA and beyond. Prices shown are "Labour Installation: 75% Off". Joseph R. and Scott handle consultations with detailed explanations; Angel Brothers and Genty lead installations. No complaints emerge in recent reviews; the only caveat concerns products and warranties, which the business explicitly advises customers to investigate.
Ivan and his team deliver professional gutter and downspout work with a hands-on approach. He visits sites to measure properly, explains solutions clearly, and completes jobs on time and clean. One reviewer noted an invoice presentation issue, but most praise his old-school work ethic, responsiveness to emergencies, and fair pricing relative to the quality delivered. The business serves Mississauga and surrounding areas (Etobicoke, Brampton, Oakville, Milton, Burlington, Halton Hills, Georgetown) and handles everything from cleaning and guards to full replacements and soffit work. Staff like Victor assist on larger jobs, and customers consistently highlight how Ivan catches problems others missed, then solves them without overcharging.
Martin's sales consultations stand out for clarity and honesty; crews like Khazin and Brian finish jobs fast, often same-day or within 2 days, with fastidious cleanup that neighbours and contractors alike notice. Staff know their trade deeply, catch issues beyond the initial scope, and respond within hours to emergencies. One reviewer mentioned room for final cleanup attention, but the pattern across 19 recent reviews is relentless professionalism and customer-focused follow-up. Damian (the owner) personally inspects finished jobs. Teams include specialists like Dean and Adam for eaves and metal work. Beyond roofing, the crew handles skylights, flat roof repairs, chimney removal, and siding with the same precision. They operate across the GTA and have GAF and VELUX certifications backing their materials and methods.
Get quotes from suitable waterproofing service in Mississauga
No cost, no obligation. Describe your roofing project and we'll match you with contractors who can help.
Most customers praise D'Angelo and Sons for fast, professional eavestrough and roof work with responsive sales teams and skilled crews like Carlos Jr. who communicate clearly and leave sites clean. Two reviews flag serious gaps: a $40,000 flat roof warranty went undocumented after installation, and one customer reported abandoned communication during a time of need, suggesting occasional service lapses on larger projects.
Reviewers consistently report fast, professional roof work from Andrew's team, with most jobs finished in two or three days. Strong emphasis on punctuality, cleanup, material quality, and the crew's courtesy; one customer notes the team accommodated repeated insurance delays without complaint.
Homeowners consistently report fast response times, fair quotes that often undercut competitors, and reliable completion. Serg and named crew members (Andriy, Sergiy, Andrey) earn praise for catching problems others missed, protecting property during work, and leaving sites spotless-though one reviewer noted questionable debris handling. The business handles flat roof repairs, shingled installations, metal roofing, gutters, siding, and emergency snow removal across the GTA. First-time homeowners and those burned by other contractors highlight their honest assessments and stress-free communication. Wind and storm damage jobs receive same-day response.
Toronto Roof Repairs charges fair rates and shows up when promised, with Stan and the team diagnosing problems honestly rather than inventing work. Office staff Vanessa and Veronica coordinate quickly, and the company returns at no charge until leaks stop and customers are satisfied, earning trust across Greater Toronto Area work.
Brad and his team deliver reliable roof repairs and replacements across the GTA, with most customers praising fast response times, transparent pricing, and skilled workmanship. One recent review flags communication issues, though older reviews consistently highlight responsiveness and quality materials that hold up over years, backed by on-warranty service at no extra charge.
Overwhelmingly praised for professional, attentive work on condo and commercial properties across Ontario and BC. Staff send detailed photo reports and understand building mechanics well. Two low ratings cite unresolved roof leaks after multiple visits and a traffic complaint unrelated to work quality.
Two reviewers called out professionalism and knowledge, but with only three five-star reviews total, the picture remains limited. Their website lists over 30 years in business, 24/7 emergency coverage, and work across flat and metal roofing with waterproofing services.
Not enough recent reviews yet to synthesise a reliable sentiment read for this business.
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 earn a referral fee from these partners, but our rankings and scores are determined solely by our published method and are never affected by referral fees.
Last updated 2026-08-25