Waterproofing & drainage companies by Toronto area
Last updated: By Below-Grade Records Desk
Housing age, soil and storm-sewer depth change from street to street, and so does the fix a contractor will recommend. WaterproofingIndex pins each of its 384 Greater Toronto Area waterproofing, foundation and drainage businesses to one of 13 areas across 6 boroughs and municipalities. Open the area nearest your house to see who works there, ordered by the WaterproofingIndex Score, each with its own profile.
Coverage
Which areas list the most waterproofing companies?
The Greater Toronto Area areas with the most listed companies are Toronto (134), Mississauga (34), and Vaughan (16), based on WaterproofingIndex's August 2026 dataset. Older housing stock and the larger municipalities tend to carry the most companies, which follows the work: the wet basements are where the foundations are oldest. Every area page orders its companies by the published 0-100 score, never by payment, so the shortlist reflects reputation rather than a media buy.