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Waterproofing · Mississauga, ONLast reviewed October 2026

4 Best Waterproofing Companies in Mississauga, ON (2026)

TenBestFind ranks 4 waterproofing contractors in Mississauga, ON. Each company was checked against the criteria set out under How we chose. Lists name up to ten companies, and this one stops at 4 because only 4 met them. The list was last reviewed on October 21, 2026.

Canada Waterproofers leads the Mississauga list with 5.0 stars from 332 Google reviews and two Master Plumber owners who quote the work themselves. Four companies cleared our bar of 4.5 stars, 50 reviews and a real Mississauga address, and we list them in Google's order as read on October 21, 2026.

4 companies reviewed4 rankedHow We Rank

The Ranking

Our top 4 waterproofing contractors in Mississauga

Mississauga basements sit on clay and shale, and many homes built in the 1960s to 1990s have weeping tile that has clogged or collapsed. The usual fixes are interior or exterior drain work, a sump pump with a backwater valve and crack repair. Ontario has no waterproofing-specific licence, so ask for a WSIB clearance certificate, proof of liability insurance and a written permit plan before you sign.

Showing 4 of 4
  1. 01

    Best for owner-led basement and drain work

    Canada Waterproofers

    5.0(333 Google reviews)
    Best forHomeowners who want an owner on site and a lifetime transferable warranty
    In business28 years
    WarrantyLifetime transferable written warranty on labour and materials, subject to terms. Mechanical sump pumps carry the manufacturer warranty of up to 3 years.
    EmergencyAvailable

    Why we picked them

    5.0 from 332 Google reviews, with two Master Plumber owners who personally quote and supervise jobs.

    What we like

    • Both owners are Master Plumbers who attend estimates
    • Lifetime transferable written warranty on labour and materials
    • Five million dollars in liability coverage stated; tidy crews

    Things to consider

    • Sump pumps carry only the manufacturer warranty, up to three years.
    Key details
    Best for
    Homeowners who want an owner on site and a lifetime transferable warranty
    Service area
    Mississauga
    Address
    3410 Semenyk Ct #9
    Years in business
    28 years
    Warranty
    Lifetime transferable written warranty on labour and materials, subject to terms. Mechanical sump pumps carry the manufacturer warranty of up to 3 years.
    Emergency service
    Available
    Financing
    Available
    Credentials
    Mississauga business licences 2025 008967 TC and 2025008966 TM
  2. 02

    Best for basement leaks and foundation cracks

    PRIME Waterproofing

    5.0(183 Google reviews)
    Best forBasement leaks and foundation cracks, interior or exterior
    In businessNot listed
    WarrantyWebsite shows a 25 year warranty badge and a satisfaction guaranteed badge; written terms are not published.
    EmergencyAvailable

    Why we picked them

    5.0 from 183 Google reviews, with reviewers praising honest quotes and one day jobs.

    What we like

    • Owner Nick named often in 183 reviews
    • WSIB and 25 year warranty badges on its own site
    • Interior, exterior, crack repair and underpinning all offered

    Things to consider

    • No founding year, licence number or written warranty terms are published online.
    Key details
    Best for
    Basement leaks and foundation cracks, interior or exterior
    Service area
    Mississauga
    Address
    3453 Cedar Creek Dr
    Warranty
    Website shows a 25 year warranty badge and a satisfaction guaranteed badge; written terms are not published.
    Emergency service
    Available
    Credentials
    WSIB Ontario (badge displayed on website)
  3. 03

    Best for exterior waterproofing and underpinning of older homes

    AquaMen Waterproofing & Underpinning

    4.9(108 Google reviews)
    Best forExterior waterproofing and underpinning for older GTA homes
    In businessNot listed
    WarrantyTransferable 25-year warranty on services, per the company website. Ask for the sample warranty to read the exclusions.
    EmergencyAvailable

    Why we picked them

    4.9 from 108 Google reviews, with a transferable 25 year warranty and WSIB covered employee crews.

    What we like

    • Transferable 25 year warranty with a sample available
    • Installers are employees with WSIB coverage
    • Reviewers praise clear quotes and spotless cleanup

    Things to consider

    • The website names no owners, publishes no prices and several pages are written for Toronto.
    Key details
    Best for
    Exterior waterproofing and underpinning for older GTA homes
    Service area
    Mississauga
    Address
    1951 Rathburn Rd E, Unit 16
    Warranty
    Transferable 25-year warranty on services, per the company website. Ask for the sample warranty to read the exclusions.
    Emergency service
    Available
    Credentials
    WSIB coverage and full insurance (HST registered)
  4. 04

    Best for a written price range and hands-on oversight

    DryMax Waterproofing

    5.0(84 Google reviews)
    Best forHomeowners who want a written price range and hands-on owner oversight
    In business12 years
    WarrantyWebsite advertises a satisfaction guarantee and warranted workmanship on every job; warranty length is not published.
    EmergencyAvailable

    Why we picked them

    5.0 from 83 Google reviews, with a site that publishes real price ranges and reviewers who praise Vasyl by name.

    What we like

    • Publishes real prices, such as about $45 per square foot for exterior walls
    • Reviewers credit Vasyl for stage by stage photos and tidy cleanup
    • Sump pumps, backwater valves and exterior membranes under one roof

    Things to consider

    • The site names no owners or crew and does not publish warranty length.
    Key details
    Best for
    Homeowners who want a written price range and hands-on owner oversight
    Service area
    Mississauga
    Address
    6068 Netherhart Rd Unit 3
    Years in business
    12 years
    Warranty
    Website advertises a satisfaction guarantee and warranted workmanship on every job; warranty length is not published.
    Emergency service
    Available
    Financing
    Available
    Credentials
    WSIB coverage

Side by Side

Compare the top waterproofing contractors in Mississauga

Ranking position reflects our editorial review, not customer ratings.

Editorial comparison of the 4 ranked companies. Customer ratings, where shown, come from the source named on each company profile.
RankCompanyBest forKey servicesService areaGoogle ratingEmergencyProfile
01Canada WaterproofersHomeowners who want an owner on site and a lifetime transferable warrantyMississauga5.0(333)YesView
02PRIME WaterproofingBasement leaks and foundation cracks, interior or exteriorMississauga5.0(183)YesView
03AquaMen Waterproofing & UnderpinningExterior waterproofing and underpinning for older GTA homesMississauga4.9(108)YesView
04DryMax WaterproofingHomeowners who want a written price range and hands-on owner oversightMississauga5.0(84)YesView

Coverage

Waterproofing companies serving Mississauga and nearby areas

Most companies in this ranking work across Ontario and the surrounding suburbs. Coverage and travel fees vary, so confirm your address is inside the service area before scheduling.

  • Mississauga

Nearby rankings

Service coverage across Mississauga. Individual company areas are listed on each profile.

Methodology

How we chose the best waterproofing contractors in Mississauga

Companies are listed in the order Google returned them for basement waterproofing searches in Mississauga on October 21, 2026. Each had at least 4.5 stars, 50 Google reviews, an operating status, a working website and a street address in Mississauga. Many firms with Mississauga pages are Toronto brands running one template page per city with no local office; those were left out. Only four firms qualified, so the list has four entries rather than ten.

Read our full ranking methodology
Evaluated4
Ranked4

Hiring

How to choose a waterproofing contractor in Mississauga

  1. Verify insurance and credentials

    Ask for a current certificate of insurance and confirm registration or licensing with the authority that issues it, not with the company.

  2. Ask for a written estimate

    Scope, materials, removal, disposal and who pulls the permit should all be named on the page rather than agreed on the doorstep.

  3. Compare multiple quotes

    Two or three bids on the same scope. A number far below the others usually means something has been left out of it.

  4. Understand the warranty

    Separate the manufacturer's warranty on materials from the company's own warranty on the work, and get both in writing.

  5. Ask who performs the work

    Find out whether the crew are employees or subcontractors, and who supervises them on the day.

  6. Check recent local projects

    Ask for addresses or photographs of comparable jobs finished nearby in the last year or two.

  7. Avoid high-pressure sales

    A discount that expires today, or a knock on the door after a storm, is a reason to slow down rather than sign.

  8. Get everything in writing

    Change orders, timeline and payment schedule included, before the first payment changes hands.

Questions to ask before hiring

0 of 10 asked

Red flags

  • No verifiable local business address or registration
  • Pressure to sign on the first visit
  • A demand for full payment up front
  • An offer to cover or waive your insurance deductible
  • Refusal to put warranty terms in writing
  • A quote that will not itemize scope

Keep Going

Related home services in Mississauga

FAQ

Waterproofing companies in Mississauga FAQs

Does Mississauga require a permit for basement waterproofing?

It depends on the work. Interior drain tile and crack repair often do not, but exterior excavation near the property line, new sump discharge and backwater valve installation can. Ask the contractor for a written permit plan, and confirm with the City of Mississauga building division before work starts.

How much does basement waterproofing cost in Mississauga?

Prices vary widely with the size of the house and the method. One company on this list publishes rough ranges, including about $10,000 to $15,000 for a perimeter drain on a 40 by 50 foot house, and the others quote after an inspection. Get two or three written quotes and compare warranty terms, not just price.

Is there a licence for waterproofing contractors in Ontario?

No. Ontario has no waterproofing-specific licence. Ask the contractor for a WSIB clearance certificate and proof of liability insurance, check the business on the Ontario Business Registry, and get the warranty in writing. Plumbing work such as backwater valves and sump connections may need a licensed plumber.

Editorial Record

About this ranking

Originally published
October 2026
Last reviewed
October 2026
Companies evaluated
4

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