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Waterproofing · Ottawa, ONLast reviewed October 2026

4 Best Waterproofing Companies in Ottawa, ON (2026)

TenBestFind ranks 4 waterproofing contractors in Ottawa, 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.

Ottawa Foundation Repair leads our Ottawa list with 4.8 stars from 100 Google reviews and a 25 year transferable exterior waterproofing warranty. Four companies cleared our bar of 4.5 stars, 50 reviews and a real 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 Ottawa

Ottawa homes sit on clay and glacial till, and the freeze and thaw cycle opens cracks in poured and block foundations every spring. Most firms here lead with crack injection or exterior excavation and also install weeping tile, sump pumps and window wells. Ontario has no waterproofing-specific licence, so ask for a WSIB clearance certificate, proof of liability insurance and a written permit plan from the City of Ottawa where work needs one.

Showing 4 of 4
  1. 01

    Best for foundation cracks where a long transferable warranty matters

    Ottawa Foundation Repair

    4.8(100 Google reviews)
    Best forFoundation cracks and wet basements with a long, transferable warranty
    In businessNot listed
    Warranty25 year transferable warranty on exterior waterproofing; 15 years on interior crack resin injections (as stated on the company website)
    EmergencyNot listed

    Why we picked them

    4.8 from 100 Google reviews, with a stated 25 year transferable warranty on exterior waterproofing.

    What we like

    • 25 year transferable exterior waterproofing warranty
    • Reviewers praise clear explanations and fair pricing
    • Serves Kanata, Orleans, Stittsville, Carp and rural Ottawa

    Things to consider

    • The website lists a different street address than Google, and no insurance or WSIB details are stated.
    Key details
    Best for
    Foundation cracks and wet basements with a long, transferable warranty
    Service area
    Ottawa
    Address
    14 Mayo Ave, Nepean, Ottawa, ON
    Warranty
    25 year transferable warranty on exterior waterproofing; 15 years on interior crack resin injections (as stated on the company website)
    Credentials
    BBB member (as stated by the company)
  2. 02

    Best for interior waterproofing and crawl spaces without exterior digging

    Wet Basement Solutions

    5.0(133 Google reviews)
    Best forInterior waterproofing and crawl space work without exterior digging
    In business18 years
    WarrantyLifetime warranty advertised on its waterproofing and crawl space pages; transfer terms and written wording are not published on the site.
    EmergencyNot listed

    Why we picked them

    5.0 from 132 Google reviews, with a patented interior drainage system and an advertised lifetime warranty.

    What we like

    • Patented Water Trek Aqua Route interior drainage system
    • Reviewers praise Nik for fast quotes and tidy crews
    • Free quotes, financing and a lifetime warranty advertised

    Things to consider

    • The website lists a Carleton Place contact address, and no licence or warranty terms are published.
    Key details
    Best for
    Interior waterproofing and crawl space work without exterior digging
    Service area
    Ottawa
    Address
    3591 Innes Rd #4, Orleans
    Years in business
    18 years
    Warranty
    Lifetime warranty advertised on its waterproofing and crawl space pages; transfer terms and written wording are not published on the site.
    Financing
    Available
  3. 03

    Best for exterior crack repair and leaky basements

    Braden Foundation Construction

    5.0(107 Google reviews)
    Best forExterior crack repair and leaky basements in old or new Ottawa foundations
    In businessNot listed
    Warranty35-year waterproofing guarantee on foundation crack repairs, stated by the company as transferable to the next owner.
    EmergencyNot listed

    Why we picked them

    5.0 from 107 Google reviews, plus a 35 year transferable crack repair guarantee on its own site.

    What we like

    • 35 year warranty, stated as transferable to the next owner
    • Foreman sent progress photos and explained each step
    • Sent a crew back to fix a sump wire

    Things to consider

    • Weekday 9 to 5 hours only, and no licence or insurance details on the site.
    Key details
    Best for
    Exterior crack repair and leaky basements in old or new Ottawa foundations
    Service area
    Ottawa
    Address
    5300 Ramsayville Rd
    Warranty
    35-year waterproofing guarantee on foundation crack repairs, stated by the company as transferable to the next owner.
  4. 04

    Best for homeowners who want to deal with the owner directly

    Renco Home Improvements

    4.9(55 Google reviews)
    Best forHomeowners who want to deal with the owner directly
    In business24 years
    WarrantyTransferable warranty signed off by the owner at final walk-through. The waterproofing page cites a lifetime transferable warranty; the crack repair page cites 10 years on interior epoxy injection and 25 years on exterior repairs.
    EmergencyNot listed

    Why we picked them

    4.9 from 55 Google reviews, an owner-led firm since 2002 that signs the warranty itself.

    What we like

    • Owner signs the transferable warranty after the final walk-through
    • Reviewers cite clear explanations and no upselling
    • Active since 2002, with BBB and HomeStars profiles

    Things to consider

    • The waterproofing page says lifetime warranty, but the crack page says 10 and 25 years.
    Key details
    Best for
    Homeowners who want to deal with the owner directly
    Service area
    Ottawa
    Address
    1178 Checkers Rd
    Years in business
    24 years
    Warranty
    Transferable warranty signed off by the owner at final walk-through. The waterproofing page cites a lifetime transferable warranty; the crack repair page cites 10 years on interior epoxy injection and 25 years on exterior repairs.
    Credentials
    BBB business profile

Side by Side

Compare the top waterproofing contractors in Ottawa

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
01Ottawa Foundation RepairFoundation cracks and wet basements with a long, transferable warrantyOttawa4.8(100)Not listedView
02Wet Basement SolutionsInterior waterproofing and crawl space work without exterior diggingOttawa5.0(133)Not listedView
03Braden Foundation ConstructionExterior crack repair and leaky basements in old or new Ottawa foundationsOttawa5.0(107)Not listedView
04Renco Home ImprovementsHomeowners who want to deal with the owner directlyOttawa4.9(55)Not listedView

Coverage

Waterproofing companies serving Ottawa 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.

  • Ottawa
  • Nepean
  • Gloucester
  • Vanier

Nearby rankings

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

Methodology

How we chose the best waterproofing contractors in Ottawa

Companies are listed in the order Google returned them for basement waterproofing searches in Ottawa on October 21, 2026. Each had at least 4.5 stars, 50 Google reviews, an operating status, a working website and an address in or near Ottawa with the city named as a service area. A firm whose website could not be read and a firm whose listed address was a private house 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 Ottawa

  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 Ottawa

FAQ

Waterproofing companies in Ottawa FAQs

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 a sump connection or backwater valve may need a licensed plumber.

How much does basement waterproofing cost in Ottawa?

None of the companies here publishes a fixed price, because cost depends on the length of the wall, access and whether the work is inside or outside. Crack injection costs far less than full exterior excavation. Get at least two written, itemized quotes and compare the warranty terms and whether they transfer to a buyer.

Why does my Ottawa basement leak every spring?

Frozen ground and snowmelt push water against foundation walls in spring, and repeated freeze and thaw cycles open cracks in poured and block walls. Clay soil around many Ottawa homes holds water against the foundation. A contractor should show you where the water enters before recommending injection, an interior drain or exterior excavation.

Editorial Record

About this ranking

Originally published
October 2026
Last reviewed
October 2026
Companies evaluated
4

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